The Experts below are selected from a list of 240 Experts worldwide ranked by ideXlab platform
Susmrita Srivastava - One of the best experts on this subject based on the ideXlab platform.
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Qualitative and Tuning Performance of MOSFET Based Small-Signal Darlington Pair Amplifiers
2013Co-Authors: Susmrita SrivastavaAbstract:Abstract: Two different circuit models of RC coupled small-signal amplifiers are developed using identical power MOSFETs in Darlington Pair configuration. Proposed circuits successfully eliminate the poor frequency response problem of Darlington Pair amplifiers at higher frequencies. An additional biasing resistance R A, ranging from 1KΩ to 100KΩ, is to be essentially used in the proposed circuits to maintain their voltage/current amplification property. In presence of R A, proposed amplifiers crop considerably high voltage gains, moderate range bandwidths and sufficiently high current gains in 1-10mV input signal range at 1 KHz frequency. Both the circuits can be tuned in specific audible frequency range, extending approximately from 130Hz to 55KHz. Tuning performance makes these amplifier circuits suitable to use in Radio and TV receivers. The qualitative and tuning performance offer a flexible application to these amplifiers to be used as high voltage gain, high power gain and tuned amplifiers. Variations in voltage gain as a function of frequency and different biasing resistances, temperature dependency of performance parameters, bandwidth and total harmonic distortion of the amplifiers are also perused to provide a wide spectrum to the qualitative studies
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A New Circuit Model of Small-Signal Amplifierusing JFETs in Darlington Pair Configuration
International Journal of Advanced Research in Electrical Electronics and Instrumentation Energy, 2013Co-Authors: Sachchidan, Shukla, Susmrita SrivastavaAbstract:A small-signal amplifier with two identical JFETs in Darlington Pair is proposed and qualitatively analyzed perhaps for the first time. Unlike CS-JFET amplifiers, the voltage gain of this amplifier is significantly higher than unity. In addition, this amplifier can also be tuned in the specific range of audible frequency extended from 90Hz to 19KHz. Tuning performance makes this amplifier suitable to use in Radio and TV receivers. An additional biasing resistance RA, ranging in 3KΩ to 1MΩ, is to be essentially used in the proposed circuit to maintain its voltage/current amplification property. With this additional biasing resistance, the proposed amplifier crops considerably wide bandwidth (12.365MHz), significantly high current gain (530.909) and fairly high voltage gain (9.108) in 1-80mV input signal range at 1 KHz frequency. These properties offer a flexible application range to the proposed amplifier as high power gain, wide band, or tuned amplifier in permissible audio-frequency range. Variations in voltage gain as a function of frequency and different biasing resistances, temperature dependency of performance parameters, bandwidth and total harmonic distortion of the amplifier are also perused to provide a wide spectrum to the qualitative studies.
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Small-Signal Amplifier with MOSFET and BJT inTriple Darlington Configuration
International Journal of Advanced Research in Electrical Electronics and Instrumentation Energy, 2013Co-Authors: Susmrita Srivastava, Sachchidan, Naresh Kumar Chaudhary, ShuklaAbstract:A new circuit model of a small-signal narrow-band amplifier is proposed and analyzed on the qualitative scale. Proposed amplifier uses two MOSFETs and a BJT in Triple Darlington configuration with two additional biasing resistances in the circuit. With low distortion percentage (1.28%), the proposed circuit successfully amplifies small-signals of 1-10mV range and simultaneously provides high voltage gain (311.593) and current gain (13.971K) with narrow bandwidth (9.665KHz). Variations of maximum voltage gain with different biasing resistances and DC supply voltage and the temperature sensitivity of various performance parameters are elaborately studied and discussed in length. Qualitative performance of the proposed amplifier is also compared with the circuit which is having BJT-MOSFET in Darlington Pair configuration. The proposed amplifier can be used to process audio range signal excursions and may be useful for those applications where high voltage and current gain would be the prime requirement of amplification in narrow-band low frequency region.
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A New Circuit Model of Small-Signal Sziklai Pair Amplifier
International Journal of Applied Physics and Mathematics, 2013Co-Authors: Sachchidanand Shukla, Susmrita SrivastavaAbstract:A new circuit model of RC coupled small-signal Sziklai Pair amplifier is proposed and qualitatively analyzed for the first time. The circuit of proposed amplifier uses a Sziklai Pair with NPN driver and crops high voltage gain (237.916), moderate bandwidth (15.10KHz), fairly high current gain (712.075) and considerably low THD (0.73%) at 1mV, 1KHz input AC signal. This circuit can be tuned in specific audible frequency range, extending approximately from 1Hz to 20KHz. Tuning performance makes this amplifier circuit suitable to use in Radio and TV receiver stages. The qualitative and tuning performance of the proposed amplifier offers it a flexible application range as high voltage gain, high power gain and tuned amplifier. Tuning performance, variation of voltage gain with frequency and different biasing resistances, input and output noises at operating frequency, temperature dependency of performance parameters and total harmonic distortion of the amplifier are perused for providing wide spectrum to the qualitative studies. The proposed Sziklai Pair configuration with NPN driver transistor can be attempted to fabricate a single pack transistor IC version of Sziklai Pair. Proposed circuit is also free from poor response problem of small-signal Darlington Pair amplifiers at higher frequencies and narrow-band response region for PNP driven small-signal Sziklai Pair amplifier
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Development and Qualitative Analysis of a New Circuit Model of Two-Stage Small-Signal Sziklai Pair Amplifier
International Journal of Computer Theory and Engineering, 2013Co-Authors: Sachchidanand Shukla, Susmrita SrivastavaAbstract:New circuit model of a two-stage small-signal Sziklai Pair amplifier is proposed for the first time. The proposed amplifier circuit, which is obtained by cascading a small-signal Sziklai Pair amplifier (Stage-1) with triple-transistor based compound Sziklai amplifier (Stage-2), is analyzed on the qualitative scale. Performance of the proposed amplifier is compared with that of Stage-1 and Stage-2 amplifier circuits to provide a wide spectrum to the qualitative studies. Proposed amplifier uses three additional biasing resistances in its circuit configuration and crops high voltage gain (237.50), high current gain (339.98) with wider bandwidth (2MHz) in 1-15mV range of AC input at 1 KHz. The proposed circuit successfully removes the poor response problem of conventional Darlington Pair amplifiers at higher frequencies and narrow bandwidth problem of recently developed (by authors) circuit of small-signal Sziklai Pair amplifier. Variation in voltage gain as a function of frequency and different biasing resistances, bandwidth and harmonic distortion of the amplifier is also pursued. The proposed amplifier may be useful for those applications where high voltage and current gain would be the prime requirement of amplification in a wider frequency range, spanned approximately from 200Hz to 2.5MHz.
Sachchidanand Shukla - One of the best experts on this subject based on the ideXlab platform.
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New small-signal amplifying system with Sziklai Pairs in triple-transistor topology
2016 International Conference on Advances in Electrical Electronic and Systems Engineering (ICAEES), 2016Co-Authors: Sachchidanand ShuklaAbstract:A new small-signal amplifying system with Sziklai Pairs in triple transistor topology is proposed and qualitatively analyzed for the first time. Proposed amplifier design may be used at preamplifier stage of EEG, Radio/TV receivers and other audible frequency range communication systems. Combination of Q1-Q2 transistors in the proposed design constitutes PNP Sziklai Pair whereas Q2-Q3 together acts as NPN Sziklai Pair. Circuit successfully amplifies audio range signals swinging in 1μV-10mV range. It produces high voltage gain (190.95), current gain greater than unity (7.208), 250.83 KHz bandwidth, low harmonic distortion (0.817%) and can be tuned in 41Hz-250KHz frequency range. Resistance RA in the design is essential to maintain its voltage/current amplification property whereas REX can be optionally used. Proposed circuit is free from the poor response problem of small-signal Darlington Pair amplifiers at higher frequencies and narrow bandwidth restrictions of recently announced PNP and NPN driven small-signal Sziklai Pair amplifiers. Tuning performance, variation of voltage gain with frequency and different biasing resistances, small-signal AC analysis, harmonic distortion, temperature dependency of performance parameters and input/output noises of the circuit are widely discussed.
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Two-stage small-signal amplifier with Darlington and Sziklai Pairs
2014 IEEE International Conference on Semiconductor Electronics (ICSE2014), 2014Co-Authors: Sachchidanand Shukla, Beena PandeyAbstract:A New circuit model of two-stage small-signal amplifier using Darlington and Sziklai Pairs is proposed for the first time. Proposed circuit is obtained by cascading a small-signal Darlington Pair amplifier with that of Sziklai Pair based small-signal amplifier with minor modifications. Proposed amplifier essentially uses two additional biasing resistances in its design. It crops considerably high voltage and current gain (345.523 and 464.357 respectively) with audible range bandwidth of 43.363 KHz for AC input signals swinging in 10–30mV range at 1KHz or lower frequency. Proposed circuit-architecture successfully removes the poor response problem of conventional Darlington Pair amplifiers at higher frequencies and narrow bandwidth problem of recently announced (by authors) circuits of small-signal Sziklai Pair amplifier. Variations in voltage gain with frequency and various biasing components like biasing resistances, DC supply voltage and coupling capacitors are discussed in length. Temperature sensitivity of performance parameters, THD and small-signal AC equivalent circuit analysis of the proposed circuit are elaborately studied. Proposed design can be implemented in cascadable gain blocks for receivers, 715Hz-44KHz frequency range power sources and in the circuits where reproduction of signal with simultaneously high voltage and current gain is the prime requirement.
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A New Circuit Model of Small-Signal Sziklai Pair Amplifier
International Journal of Applied Physics and Mathematics, 2013Co-Authors: Sachchidanand Shukla, Susmrita SrivastavaAbstract:A new circuit model of RC coupled small-signal Sziklai Pair amplifier is proposed and qualitatively analyzed for the first time. The circuit of proposed amplifier uses a Sziklai Pair with NPN driver and crops high voltage gain (237.916), moderate bandwidth (15.10KHz), fairly high current gain (712.075) and considerably low THD (0.73%) at 1mV, 1KHz input AC signal. This circuit can be tuned in specific audible frequency range, extending approximately from 1Hz to 20KHz. Tuning performance makes this amplifier circuit suitable to use in Radio and TV receiver stages. The qualitative and tuning performance of the proposed amplifier offers it a flexible application range as high voltage gain, high power gain and tuned amplifier. Tuning performance, variation of voltage gain with frequency and different biasing resistances, input and output noises at operating frequency, temperature dependency of performance parameters and total harmonic distortion of the amplifier are perused for providing wide spectrum to the qualitative studies. The proposed Sziklai Pair configuration with NPN driver transistor can be attempted to fabricate a single pack transistor IC version of Sziklai Pair. Proposed circuit is also free from poor response problem of small-signal Darlington Pair amplifiers at higher frequencies and narrow-band response region for PNP driven small-signal Sziklai Pair amplifier
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Development and Qualitative Analysis of a New Circuit Model of Two-Stage Small-Signal Sziklai Pair Amplifier
International Journal of Computer Theory and Engineering, 2013Co-Authors: Sachchidanand Shukla, Susmrita SrivastavaAbstract:New circuit model of a two-stage small-signal Sziklai Pair amplifier is proposed for the first time. The proposed amplifier circuit, which is obtained by cascading a small-signal Sziklai Pair amplifier (Stage-1) with triple-transistor based compound Sziklai amplifier (Stage-2), is analyzed on the qualitative scale. Performance of the proposed amplifier is compared with that of Stage-1 and Stage-2 amplifier circuits to provide a wide spectrum to the qualitative studies. Proposed amplifier uses three additional biasing resistances in its circuit configuration and crops high voltage gain (237.50), high current gain (339.98) with wider bandwidth (2MHz) in 1-15mV range of AC input at 1 KHz. The proposed circuit successfully removes the poor response problem of conventional Darlington Pair amplifiers at higher frequencies and narrow bandwidth problem of recently developed (by authors) circuit of small-signal Sziklai Pair amplifier. Variation in voltage gain as a function of frequency and different biasing resistances, bandwidth and harmonic distortion of the amplifier is also pursued. The proposed amplifier may be useful for those applications where high voltage and current gain would be the prime requirement of amplification in a wider frequency range, spanned approximately from 200Hz to 2.5MHz.
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Qualitative analysis of small-signal modified Sziklai Pair amplifier
2012Co-Authors: Beena Pandey, Susmrita Srivastava, Satyendra Nath Tiwari, Jitendra Singh, Sachchidanand ShuklaAbstract:A small-signal modified Sziklai Pair (complementary Darlington Pair) amplifier is proposed with an additional biasing resistance in the circuit. The proposed amplifier produces significantly high voltage gain with narrow bandwidth. Poor response of conventional Darlington Pair amplifiers at higher frequencies is found to be absent in the proposed amplifier circuit. Variations in voltage gain as a function of frequency and different biasing resistances, bandwidth and total harmonic distortion of the amplifier have also been studied. Proposed amplifier may be useful for various analog communication applications.
Nandakishor Yadav - One of the best experts on this subject based on the ideXlab platform.
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Design of a Voltage to Time Converter with High Conversion Gain for Reliable and Secure Autonomous Vehicles
Electronics, 2020Co-Authors: Nandakishor Yadav, Youngbae Kim, Mahmoud Alashi, Kyuwon Ken ChoiAbstract:Automation of vehicles requires a secure, reliable, and real-time on-chip system. These systems also require very high-speed and compact on-chip analog to digital converters (ADC). The conventional ADC cannot fulfill this requirement. In this paper, we proposed a Darlington Pair- and source biasing-based high speed, secure, and reliable voltage to time converter (VTC). It is a compact, high-speed design and gives high conversion gain. The source biasing also helps to increase the input voltage range. The conversion gain of the proposed circuit is 101.43ns/v, which is 52 times greater than the gain achieved by state-of-the-art design. It also shows less effect of process variation and bias temperature instability.
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SUBHDIP: process variations tolerant subthreshold Darlington Pair-based NBTI sensor circuit
IET Computers & Digital Techniques, 2018Co-Authors: Ambika Prasad Shah, Nandakishor Yadav, Ankur Beohar, Santosh Kumar VishvakarmaAbstract:Aggressive technology scaling has inevitably led to reliability becomes a major concern for modern high-speed and high-performance integrated circuits. The major reliability concerns in nanoscale very-large-scale integration design are the time-dependent negative bias temperature instability (NBTI) degradation. Owing to increasing vertical oxide field and higher operating temperature, the threshold voltage of P-channel MOS transistors increases with time under NBTI. This study presents a novel subthreshold Darlington Pair-based NBTI degradation sensor under the stress conditions. The proposed sensor provides the high degree of linearity and sensitivity under subthreshold conditions. The Darlington Pair used in the circuit provides the stability and the high-input impedance of the circuit makes it less affected by the process variations. Owing to high sensitivity, the proposed sensor is best suited for sensing of temperature variation, process variation, and temporal degradation during measurement. The sensitivity of the proposed sensor at room temperature is 0.239 mV/nA under subthreshold conditions. The proposed sensor is less affected by the process variation and has the maximum deviation of 0.0011 mV at standby leakage current of 30 nA.
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Subthreshold Darlington Pair based NBTI sensor for reliable CMOS circuits
2017 International Conference on Electron Devices and Solid-State Circuits (EDSSC), 2017Co-Authors: Ambika Prasad Shah, Nandakishor Yadav, Ankur Beohar, Santosh Kumar VishvakarmaAbstract:This paper presents a novel subthreshold Darlington Pair based negative bias temperature instability (NBTI) monitoring sensor under the stress conditions. The Darlington Pair used in the circuit provides the stability of the circuit and the high input impedance of the circuit makes it less affected by the PVT variations. The proposed sensor provides the high degree of linearity and sensitivity under subthreshold conditions. The sensitivity of the proposed sensor is 8.15 μV/nA and also the sensor is less affected by the process variation and has the deviation of 0.0011 mV at standby leakage current of 30 nA.
Fred R Beyette - One of the best experts on this subject based on the ideXlab platform.
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Implementation of a Si/SiC hybrid optically controlled high power switching device
Silicon-based and Hybrid Optoelectronics IV, 2002Co-Authors: P Bhadri, E Guliants, K. Ye, Fred R BeyetteAbstract:The ever-increasing performance and economic requirements placed on commercial and military aircraft are resulting in the need for very complex avionic systems. To help alleviate some of the design complexity, fiber optic components have been suggested as an enabling technology that could allow the creation of an optical communications network routed throughout the avionic systems of an aircraft. Based on the often-cited benefits of high data throughput, immunity to EMI, reduced maintenance costs and reduced weight, the use of fiber optic links to communicate control signals and sensor information throughout the aircraft could lead to significant performance improvements for next generation aircraft. Fly-by-Light systems that use optical control signals to actuate the flight surfaces of an aircraft have been suggested as an important technology for avionic systems where degradation of signal integrity due to EMI can have catastrophic consequences. Current fly-by-light systems are limited by the lack of optically activated high-power switching devices. The challenge has been the development of an optoelectronic switching technology that can withstand the high power and harsh environmental conditions common in a flight surface actuation system. Wide bandgap semiconductors such as Silicon Carbide offer the potential to overcome both the temperature and voltage blocking limitations that inhibit the use of Silicon. Unfortunately, SiC is not optically active at the near IR wavelengths where communications grade light sources are readily available. Thus, we have proposed a hybrid device that combines a silicon based photoreceiver module with a SiC power transistor. When illuminated with a 5mW optical control signal the silicon chip produces a 15 mA drive current for a SiC Darlington Pair. The SiC Darlington Pair then produces a 150 A current that is suitable for driving an electric motor with sufficient horsepower to actuate the control surfaces on an aircraft. Further, when the optical signal is turned off, the SiC is capable of holding off a 270 V potential to insure that the motor drive current is completely off. We present in this paper the design and initial test results from a prototype device that has recently been fabricated.
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Design and simulation of a smart optically controlled high-power switch based on a Si/SiC hybrid device structure
Optoelectronic and Wireless Data Management Processing Storage and Retrieval, 2001Co-Authors: P Bhadri, Deepti Sukumaran, Samhita Dasgupta, Fred R BeyetteAbstract:ABSTRACT In avionic systems, data integrity and high data rates are necessary for stable flight control. Unfortunately, conventional electronic control systems are susceptible to electromagnetic interference (EMI) that can reduce the clarity of flight control signals. Fly-by-Light systems that use optical signals to actuate the flight control surfaces of an aircraft have been suggested as a solution to the EMI problem in avionic systems. Fly-by-Light in avionic systems reduces electromagnetic interference hence improving the clarity of the control signals. A hybrid approach combining a silicon photoreceiver module with a SiC power transistor is proposed. The resulting device uses a 5mW optical control signal to produce a 150A current suitable for driving an electric motor . Keywords: Optically Controlled Switch, Silicon Carbide Devices, High Power Switching 1. INTRODUCTION Fiber optic component technology has been under development by the government and industry laboratories for over 20 years. The ever-increasing performance and economy of operation requirements placed on commercial and military transport aircraft are resulting in very complex systems. The often-cited benefits are high data throughput, immunity to EMI, reduced certification and maintenance costs and reduced weight features. These all motivate their application to flight control systems. Current Fly-by-Light systems are limited by the lack of optically activated high power switching devices. Due to there high breakdown voltages and ability to withstand high operating temperatures Silicon Carbide transistors have been suggested as ideal switching devices for high power applications. Unfortunately, SiC is not optically active at the near IR wavelengths where communications grade light sources are readily available. Thus, a hybrid approach is proposed that combines a silicon photoreceiver module with a SiC power transistor. The Silicon Chip consists of a photodetector, a receiver circuit and diagnostic circuits for real time evaluation of the control system operation. An analysis of the silicon chip design indicates that less than 5mW of optical signal is required to activate the silicon chip. When illuminated with the 5mW optical control signal the silicon chip produces a 15mA current that is used to drive a SiC Darlington Pair. With a 15mA input current, the SiC chip will produce a 150 A current suitable for driving an electric motor with sufficient horsepower to actuate the control surfaces on an aircraft. In this paper we will report on our recent efforts towards demonstration of this hybrid Si-SiC module.
Beena Pandey - One of the best experts on this subject based on the ideXlab platform.
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Two-stage small-signal amplifier with Darlington and Sziklai Pairs
2014 IEEE International Conference on Semiconductor Electronics (ICSE2014), 2014Co-Authors: Sachchidanand Shukla, Beena PandeyAbstract:A New circuit model of two-stage small-signal amplifier using Darlington and Sziklai Pairs is proposed for the first time. Proposed circuit is obtained by cascading a small-signal Darlington Pair amplifier with that of Sziklai Pair based small-signal amplifier with minor modifications. Proposed amplifier essentially uses two additional biasing resistances in its design. It crops considerably high voltage and current gain (345.523 and 464.357 respectively) with audible range bandwidth of 43.363 KHz for AC input signals swinging in 10–30mV range at 1KHz or lower frequency. Proposed circuit-architecture successfully removes the poor response problem of conventional Darlington Pair amplifiers at higher frequencies and narrow bandwidth problem of recently announced (by authors) circuits of small-signal Sziklai Pair amplifier. Variations in voltage gain with frequency and various biasing components like biasing resistances, DC supply voltage and coupling capacitors are discussed in length. Temperature sensitivity of performance parameters, THD and small-signal AC equivalent circuit analysis of the proposed circuit are elaborately studied. Proposed design can be implemented in cascadable gain blocks for receivers, 715Hz-44KHz frequency range power sources and in the circuits where reproduction of signal with simultaneously high voltage and current gain is the prime requirement.
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Qualitative analysis of small-signal modified Sziklai Pair amplifier
2012Co-Authors: Beena Pandey, Susmrita Srivastava, Satyendra Nath Tiwari, Jitendra Singh, Sachchidanand ShuklaAbstract:A small-signal modified Sziklai Pair (complementary Darlington Pair) amplifier is proposed with an additional biasing resistance in the circuit. The proposed amplifier produces significantly high voltage gain with narrow bandwidth. Poor response of conventional Darlington Pair amplifiers at higher frequencies is found to be absent in the proposed amplifier circuit. Variations in voltage gain as a function of frequency and different biasing resistances, bandwidth and total harmonic distortion of the amplifier have also been studied. Proposed amplifier may be useful for various analog communication applications.
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Qualitative study of a new circuit model of small-signal amplifier using Sziklai Pair in compound configuration
2012 10th IEEE International Conference on Semiconductor Electronics (ICSE), 2012Co-Authors: Sachchidanand Shukla, Beena Pandey, Susmrita SrivastavaAbstract:A new circuit model of small-signal wide-band voltage amplifier using Sziklai Pair is proposed for the first time. The proposed amplifier circuit uses two PNP and one NPN transistors and two additional biasing resistances in its configuration. The upper half of the triple transistor system with transistors Q1 and Q2 constitute a Sziklai Pair while the lower half with Q2 and Q3 forms complementary Sziklai Pair. The over-all performance of the proposed amplifier circuit is found to be superior than conventional or modified small-signal Darlington and Sziklai Pair amplifiers and as a rare feature the proposed circuit simultaneously produces high voltage gain and wide bandwidth. Poor response of small-signal Darlington Pair amplifiers at higher frequencies and narrow bandwidth problem of small-signal Sziklai Pair amplifier is found to be absent in the proposed amplifier. Variations in voltage gain as a function of frequency and different biasing resistances, bandwidth and total harmonic distortion of the amplifier is also pursued. Proposed amplifier may be useful for various analog communication applications.
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Qualitative analysis of mos based Darlington Pair amplifiers
Bulletin of Pure & Applied Sciences- Physics, 2011Co-Authors: Susmrita Srivastava, Beena Pandey, Satyendra Nath Tiwari, Jitendra Singh, Sachchidanand ShuklaAbstract:Two modifications in small-signal Darlington Pair amplifier are proposed initially by replacing BJTs of the Pair with two identical power MOS transistor. As a rare feature, one of the proposed amplifiers simultaneously produces high voltage and current gains with widening of bandwidth and therefore it can be used for signal processing if used with appropriate filter. Poor response of BJT based conventional small-signal Darlington Pair amplifiers at higher frequencies are found absent in the proposed amplifier circuits. Variations in voltage gain as a function of frequency and different biasing reSistances, bandwidth and total harmonic distortion of the amplifiers are also perused.
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Voltage gain performance of two-stage amplifier, configured by coupling common emitter and Darlington Pair amplifiers
Bulletin of Pure & Applied Sciences- Physics, 2010Co-Authors: Satyendra Nath Tiwari, Beena Pandey, Susmrita Srivastava, Sachchidanand ShuklaAbstract:Qualitative performance of a two-stage amplifier, configured by coupling a CE amplifier with Darlington Pair amplifier is critically analyzed. A significant enlargement in bandwidth on the cost of voltage and current gains is observed. This proposed two-stage amplifier may be quite useful for amplification of small signals up to the voltage range of 25mV and suitable for various analog electronics and communication applications.
