The Experts below are selected from a list of 5448 Experts worldwide ranked by ideXlab platform

Hans Gaunholt - One of the best experts on this subject based on the ideXlab platform.

  • a numerical design approach for single amplifier active rc Butterworth Filter of Order 5
    International Symposium on Circuits and Systems, 2007
    Co-Authors: Hans Gaunholt
    Abstract:

    A design method is presented for the design of all pole lowpass active-RC Filters applying operational amplifiers. The operational amplifier model used is the integrator model: omegat/s where omegat is the unity gain frequency. The design method is used for the design of a fifth Order Butterworth Filter applying just one operational amplifier coupled as a unity gain amplifier. It is shown that the influence from the real operational amplifier may be reduced by trimming just one resistor in the circuit. The unity gain amplifiers have the advantage of providing low power consumption, yielding a large dynamic range, sometimes simplifying the amplifier design and being usable over a larger frequency range than conventional constant gain amplifiers. The Schoeffler sensitivity index is used as a basis for a sensitivity comparison with other similar Filters reported in the literature.

  • ISCAS - A numerical design approach for single amplifier, Active-RC Butterworth Filter of Order 5
    2007 IEEE International Symposium on Circuits and Systems, 2007
    Co-Authors: Hans Gaunholt
    Abstract:

    A design method is presented for the design of all pole lowpass active-RC Filters applying operational amplifiers. The operational amplifier model used is the integrator model: omegat/s where omegat is the unity gain frequency. The design method is used for the design of a fifth Order Butterworth Filter applying just one operational amplifier coupled as a unity gain amplifier. It is shown that the influence from the real operational amplifier may be reduced by trimming just one resistor in the circuit. The unity gain amplifiers have the advantage of providing low power consumption, yielding a large dynamic range, sometimes simplifying the amplifier design and being usable over a larger frequency range than conventional constant gain amplifiers. The Schoeffler sensitivity index is used as a basis for a sensitivity comparison with other similar Filters reported in the literature.

Payam Lajevardi - One of the best experts on this subject based on the ideXlab platform.

  • Design and Analysis of Reconfigurable Analog System
    2011
    Co-Authors: Payam Lajevardi
    Abstract:

    Abstract : A highly-configurable analog system is presented. A prototype chip is fabricated and an ADC and Filter functionalities are demonstrated. The chip consists of eight identical programmable stages. In an ADC configuration, the first five stages are programmed to implement a 10- bit ADC. The ADC has ENOB of 8 bits at 50 MSPS. The ENOB improves to 8.5 bits if the sampling rate is lowered to 30 MSPS. The ADC has an FOM of 150fJ/conversion step which is very competitive with the state of the art ADCs. The first stage is responsible for 75% of the input-referred noise power. The sampling noise is responsible for 40% of the total noise power and the zero-crossing detector is responsible for 60%. The chip is tested in two different Filter configurations. In one test, the first two stages of the chip are configured as a second Order Butterworth Filter and the third stage is configured as an amplifier. In another test, the first three stages of the chip are programmed as a third-Order Butterworth Filter. The desired Filter functionalities are demonstrated in both configurations. It is shown that in a third Order Butterworth Filter, more than 90% of the noise is due to the zero-crossing detector of the last stage. This is mainly due to the fact that the noise of earlier stages is Filtered with the Filter transfer function, but the noise of the last stage is not Filtered. The ZCBC architecture has been used to avoid the stability problems and scale power consumption with sampling frequency. A new technique is introduced to implement the terminating resistors in a ladder Filter. This technique does not have any area or power overhead. An asymmetric differential signaling is also introduced. This method improves the dynamic range of the output signals, which is particularly important in new technology nodes with low supply voltage.

  • Zero-Crossing Detector Based Reconfigurable Analog System
    IEEE Journal of Solid-State Circuits, 2011
    Co-Authors: Payam Lajevardi, Anantha P. Chandrakasan
    Abstract:

    A reconfigurable analog system is presented that implements pipelined ADCs, switched-capacitor Filters, and programmable gain amplifiers. Each block employs a zero-crossing based circuit for easy reconfigurability and power efficiency. Configured as a 10-bit ADC, the chip consumes 1.92 mW at 50 MSPS with ENOB of 8.02 bit and FOM of 150 fJ/conversion-step. A second-Order and a third-Order Butterworth Filter are also demonstrated. The thermal noise of the system is analyzed in different configurations and the dominant sources of noise are determined. It is shown that around 90% of the noise in ADC configuration is generated by the first stage, while in Filter configuration, around 90% of the noise is generated by the last stage. The chip is implemented in a 65 nm technology.

  • Zero-crossing detector based reconfigurable analog system
    2010 IEEE Asian Solid-State Circuits Conference, 2010
    Co-Authors: Payam Lajevardi, Anantha P. Chandrakasan, Hae-seung Lee
    Abstract:

    A reconfigurable analog system is presented that implements pipelined ADCs, switched-capacitor Filters, and programmable gain amplifiers. Each block employs a zero-crossing based circuit for easy reconfigurability and power efficiency. Configured as a 10-bit ADC, the chip consumes 1.92mW at 50MSPS with ENOB of 8.02b and FOM of 150fJ/conversion-step. A third Order Butterworth Filter is also demonstrated. The chip is implemented in 65nm technology.

Anantha P. Chandrakasan - One of the best experts on this subject based on the ideXlab platform.

  • Zero-Crossing Detector Based Reconfigurable Analog System
    IEEE Journal of Solid-State Circuits, 2011
    Co-Authors: Payam Lajevardi, Anantha P. Chandrakasan
    Abstract:

    A reconfigurable analog system is presented that implements pipelined ADCs, switched-capacitor Filters, and programmable gain amplifiers. Each block employs a zero-crossing based circuit for easy reconfigurability and power efficiency. Configured as a 10-bit ADC, the chip consumes 1.92 mW at 50 MSPS with ENOB of 8.02 bit and FOM of 150 fJ/conversion-step. A second-Order and a third-Order Butterworth Filter are also demonstrated. The thermal noise of the system is analyzed in different configurations and the dominant sources of noise are determined. It is shown that around 90% of the noise in ADC configuration is generated by the first stage, while in Filter configuration, around 90% of the noise is generated by the last stage. The chip is implemented in a 65 nm technology.

  • Zero-crossing detector based reconfigurable analog system
    2010 IEEE Asian Solid-State Circuits Conference, 2010
    Co-Authors: Payam Lajevardi, Anantha P. Chandrakasan, Hae-seung Lee
    Abstract:

    A reconfigurable analog system is presented that implements pipelined ADCs, switched-capacitor Filters, and programmable gain amplifiers. Each block employs a zero-crossing based circuit for easy reconfigurability and power efficiency. Configured as a 10-bit ADC, the chip consumes 1.92mW at 50MSPS with ENOB of 8.02b and FOM of 150fJ/conversion-step. A third Order Butterworth Filter is also demonstrated. The chip is implemented in 65nm technology.

Hakan Kuntman - One of the best experts on this subject based on the ideXlab platform.

  • Simple Realization of a Third Order Butterworth Filter with MOS-only Technique
    AEU - International Journal of Electronics and Communications, 2017
    Co-Authors: Mesut Atasoyu, Hakan Kuntman, Bilgin Metin, Oguzhan Cicekoglu
    Abstract:

    Abstract Recently, many active Filter circuits that use only MOS transistors were presented in the literature. In these circuits, instead of passive resistors, transconductances of MOSFETs operating in saturation region are used. Moreover, their parasitic gate to source capacitances are employed instead of passive capacitors. These circuits provide circuit implementation with fewer transistors and eliminate the need for external passive elements. In this study, a MOS-only third Order Butterworth Filter for high frequency applications has been proposed. The circuit leads to a compact circuit having fewer number of transistors compared to classical active block-based analog counterparts. Simulation results agree well with the theoretical study.

  • MOS-only third Order Butterworth Filter with DTMOS tuning technique for high frequency applications
    2015 9th International Conference on Electrical and Electronics Engineering (ELECO), 2015
    Co-Authors: Atilla Uygur, Bilgin Metin, Oguzhan Cicekoglu, Hakan Kuntman
    Abstract:

    In this paper, a new low-voltage, MOS-only, third Order low-pass Filter is proposed. The core circuit consists of only three MOSFETs and their parasitic gate to source capacitances as passive elements. Using TSMC 0.18μm technology parameters, the circuit with all biasing elements included consumes just 0.69mW for a cut-off frequency higher than 200MHz under a single supply of 1.8V. Non-ideal effects have been investigated and dynamic threshold voltage MOS (DTMOS) tuning technique has been developed for the Filter circuit to suppress the non-idealities. Resulting circuit is capable of operation at high frequencies with low power consumption due to the usage of significantly less number of transistors than conventional active block-based Filtering circuits.

  • High output impedance current-mode third-Order Butterworth Filter topologies employing unity gain voltage buffers and equal-valued passive components
    International Journal of Electronics, 2003
    Co-Authors: Murat Aksoy, Sadri Özcan, Oguzhan Cicekoglu, Hakan Kuntman
    Abstract:

    This paper presents eight new current mode third-Order band pass Filter topologies employing unity-gain active elements, three resistances and three capacitors. An additional topology is identical to a previously reported one, repeated here for completeness. Using equal passive components, all of the proposed topologies realize third-Order BP Butterworth Filter function, which can easily be converted to a LP if they are cascaded with an integrator, Therefore, without any component spread the circuits are attractive from the integration point of view. In each of the circuits, except one topology, one of the unity gain cells can be replaced by a second-generation current conveyor to pick up the output current and to obtain a high impedance output. The high output impedance provided by the current conveyor permits easy cascadability for the proposed circuits to construct high-Order communication Filters. Simulation and experimental results are included to verify theory.

  • Realization of Current-Mode Third Order Butterworth Filters Employing Equal Valued Passive Elements and Unity Gain Buffers
    Analog Integrated Circuits and Signal Processing, 2002
    Co-Authors: Hakan Kuntman, Oguzhan Cicekoglu, Sadri Özcan
    Abstract:

    This paper describes current-mode third-Order Butterworth Filter topologies realized with unity gain active elements and minimum number of passive components. All capacitors and resistors are equal valued. The core of the circuit realizes HP, BP and LP functions easily. The Filter exhibits high output impedance. Experimental results are included to verify theory.

  • Third Order Butterworth Filter for current-mode operation employing equal valued capacitors, equal valued resistors and unity gain active elements
    ICM 2001 Proceedings. The 13th International Conference on Microelectronics., 2001
    Co-Authors: Hakan Kuntman, Oguzhan Cicekoglu, Sadri Özcan
    Abstract:

    This paper describes a current-mode third-Order Butterworth Filter realised with unity gain active elements and minimum number of passive components. All capacitors and resistors are equal valued. The core of the circuit realises HP, BP and LP functions easily. The Filter exhibits high output impedance. Experimental results are included to verify theory.

Oguzhan Cicekoglu - One of the best experts on this subject based on the ideXlab platform.

  • Simple Realization of a Third Order Butterworth Filter with MOS-only Technique
    AEU - International Journal of Electronics and Communications, 2017
    Co-Authors: Mesut Atasoyu, Hakan Kuntman, Bilgin Metin, Oguzhan Cicekoglu
    Abstract:

    Abstract Recently, many active Filter circuits that use only MOS transistors were presented in the literature. In these circuits, instead of passive resistors, transconductances of MOSFETs operating in saturation region are used. Moreover, their parasitic gate to source capacitances are employed instead of passive capacitors. These circuits provide circuit implementation with fewer transistors and eliminate the need for external passive elements. In this study, a MOS-only third Order Butterworth Filter for high frequency applications has been proposed. The circuit leads to a compact circuit having fewer number of transistors compared to classical active block-based analog counterparts. Simulation results agree well with the theoretical study.

  • MOS-only third Order Butterworth Filter with DTMOS tuning technique for high frequency applications
    2015 9th International Conference on Electrical and Electronics Engineering (ELECO), 2015
    Co-Authors: Atilla Uygur, Bilgin Metin, Oguzhan Cicekoglu, Hakan Kuntman
    Abstract:

    In this paper, a new low-voltage, MOS-only, third Order low-pass Filter is proposed. The core circuit consists of only three MOSFETs and their parasitic gate to source capacitances as passive elements. Using TSMC 0.18μm technology parameters, the circuit with all biasing elements included consumes just 0.69mW for a cut-off frequency higher than 200MHz under a single supply of 1.8V. Non-ideal effects have been investigated and dynamic threshold voltage MOS (DTMOS) tuning technique has been developed for the Filter circuit to suppress the non-idealities. Resulting circuit is capable of operation at high frequencies with low power consumption due to the usage of significantly less number of transistors than conventional active block-based Filtering circuits.

  • resistorless floating immittance function simulators employing current controlled conveyors and a grounded capacitor
    Electrical Engineering, 2006
    Co-Authors: Erkan Yuce, Shahram Minaei, Oguzhan Cicekoglu
    Abstract:

    In this paper, new floating immittance function simulators employing second-generation current controlled conveyors are proposed. The first four of the presented circuits employ only a single grounded capacitor as passive component and can realize either a negative or a positive floating inductor or capacitor. The last two of the proposed circuits do not employ passive components and can realize either negative or positive floating resistances. All of the proposed circuits do not require passive element matching. As an application, a third-Order Butterworth Filter is realized using the proposed positive floating inductance simulator. SPICE simulation results and large signal behavior of the Filter are included.

  • High output impedance current-mode third-Order Butterworth Filter topologies employing unity gain voltage buffers and equal-valued passive components
    International Journal of Electronics, 2003
    Co-Authors: Murat Aksoy, Sadri Özcan, Oguzhan Cicekoglu, Hakan Kuntman
    Abstract:

    This paper presents eight new current mode third-Order band pass Filter topologies employing unity-gain active elements, three resistances and three capacitors. An additional topology is identical to a previously reported one, repeated here for completeness. Using equal passive components, all of the proposed topologies realize third-Order BP Butterworth Filter function, which can easily be converted to a LP if they are cascaded with an integrator, Therefore, without any component spread the circuits are attractive from the integration point of view. In each of the circuits, except one topology, one of the unity gain cells can be replaced by a second-generation current conveyor to pick up the output current and to obtain a high impedance output. The high output impedance provided by the current conveyor permits easy cascadability for the proposed circuits to construct high-Order communication Filters. Simulation and experimental results are included to verify theory.

  • Realization of Current-Mode Third Order Butterworth Filters Employing Equal Valued Passive Elements and Unity Gain Buffers
    Analog Integrated Circuits and Signal Processing, 2002
    Co-Authors: Hakan Kuntman, Oguzhan Cicekoglu, Sadri Özcan
    Abstract:

    This paper describes current-mode third-Order Butterworth Filter topologies realized with unity gain active elements and minimum number of passive components. All capacitors and resistors are equal valued. The core of the circuit realizes HP, BP and LP functions easily. The Filter exhibits high output impedance. Experimental results are included to verify theory.