Conversion Time

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B.h. Kolner - One of the best experts on this subject based on the ideXlab platform.

  • Up-Conversion Time microscope demonstrates 103x magnification of an ultrafast waveforms with 300 fs resolution
    1998
    Co-Authors: C.v. Bennett, B.h. Kolner
    Abstract:

    We have demonstrated a system for the temporal expansion of arbitrarily shaped ultrafast optical waveforms based on the principle of temporal imaging. This system has demonstrated 103x magnification of an input signal with 300 fs resolution, thus allowing ultrafast phenomena to be recorded with slower conventional technology. The physics of temporal imaging work on a single shot basis, thus it is expected that this technology will lead to a new class of single transient recorders with ultrafast resolution.

  • temporal magnification and reversal of 100 gb s optical data with an up Conversion Time microscope
    Applied Physics Letters, 1994
    Co-Authors: C.v. Bennett, Ryan P Scott, B.h. Kolner
    Abstract:

    We have developed an up‐Conversion Time microscope capable of expanding ultrafast optical wave forms to a Time scale accessible to ordinary sampling oscilloscopes. In this system, a 100 Gb/s optical word is magnified (slowed down) to a rate of 8.55 Gb/s with a Time lens placed between two dispersive delay lines. The Time lens is a nonlinear crystal which mixes the dispersed data with a linearly chirped pump pulse thus imparting a linear frequency sweep to the unconverted wave form. A second dispersive delay line completes the arrangement and forms the temporal analog of a single lens spatial imaging system resulting in a Time reversed wave form with a magnification M=−11.7.

  • Up-Conversion Time lens demonstrates 12/spl Times/ magnification of 100 Gb/s data
    Proceedings of LEOS'94, 1994
    Co-Authors: C.v. Bennett, R.p. Scott, B.h. Kolner
    Abstract:

    An up-Conversion Time lens has been demonstrated for the first Time. This type of Time lens is based on noncollinear up-Conversion of the signal with a linearly chirped pump. It has been used in a Time microscope system to produce a temporal magnification of M=-11.7. This technique should prove useful for allowing direct measurements of ultrashort waveforms by magnifying them to a Time scale accessible to current state-of-the-art instruments.

A. Bermak - One of the best experts on this subject based on the ideXlab platform.

  • A DPS array with programmable resolution and reconfigurable Conversion Time
    IEEE Transactions on Very Large Scale Integration (VLSI) Systems, 2006
    Co-Authors: A. Bermak, Yat-fong Yung
    Abstract:

    A CMOS digital pixel sensor (DPS) with programmable resolution and reconfigurable Conversion Time is described. The chip features a unique architecture based on the pulse width modulation (PWM) technique and operates with either an 8-b or 4-b accuracy. The 8-b Conversion mode is used for high-precision imaging while the 4-b Conversion mode provides a shorter Conversion Time and a two Times increase in spatial resolution. Two quantization schemes are studied, namely, the uniform and the nonuniform Time-domain quantizers, which are referred to as UQ and NUQ, respectively. It is shown that the latter scheme not only permits to linearize the nonlinear response of the PWM sensor, but also allows to significantly speed up the Conversion Time, particularly for wide dynamic range and low coding resolutions. A prototype of 32/spl Times/32/64/spl Times/32 pixels has been fabricated using 1-poly, 5-metal CMOS 0.35-/spl mu/m n-well standard process. Power dissipation is 10 mW at V/sub DD/=3.3 V, dynamic range is 90 dB, while dark current was measured at 1 pA. The reconfiguration features of the chip have been verified experimentally.

  • Conversion Time analysis of Time domain digital pixel sensor in uniform and non-uniform quantizers
    Fifth International Workshop on System-on-Chip for Real-Time Applications (IWSOC'05), 2005
    Co-Authors: A. Bermak
    Abstract:

    This paper analyzes the Conversion Time of a Time domain digital pixel sensor based on pulse width modulation scheme. Two quantization schemes are studied namely the uniform Time domain (UQ) and the non uniform Time domain (NUQ) quantizers. It is shown that the latter scheme not only permits to linearize the non-linear response of a PWM vision sensor but also allows to significantly speed-up the Conversion Time particularly for wide dynamic range and lower coding resolution. The VLSI architecture of a reconfigurable DPS for variable spatial and coding resolutions is proposed in 1-poly, 5 metal CMOS 0.35/spl mu/m n-well process.

  • IWSOC - Conversion Time analysis of Time domain digital pixel sensor in uniform and non-uniform quantizers
    Fifth International Workshop on System-on-Chip for Real-Time Applications (IWSOC'05), 2005
    Co-Authors: A. Bermak
    Abstract:

    This paper analyzes the Conversion Time of a Time domain digital pixel sensor based on pulse width modulation scheme. Two quantization schemes are studied namely the uniform Time domain (UQ) and the non uniform Time domain (NUQ) quantizers. It is shown that the latter scheme not only permits to linearize the non-linear response of a PWM vision sensor but also allows to significantly speed-up the Conversion Time particularly for wide dynamic range and lower coding resolution. The VLSI architecture of a reconfigurable DPS for variable spatial and coding resolutions is proposed in 1-poly, 5 metal CMOS 0.35/spl mu/m n-well process.

C.v. Bennett - One of the best experts on this subject based on the ideXlab platform.

  • Up-Conversion Time microscope demonstrates 103x magnification of an ultrafast waveforms with 300 fs resolution
    1998
    Co-Authors: C.v. Bennett, B.h. Kolner
    Abstract:

    We have demonstrated a system for the temporal expansion of arbitrarily shaped ultrafast optical waveforms based on the principle of temporal imaging. This system has demonstrated 103x magnification of an input signal with 300 fs resolution, thus allowing ultrafast phenomena to be recorded with slower conventional technology. The physics of temporal imaging work on a single shot basis, thus it is expected that this technology will lead to a new class of single transient recorders with ultrafast resolution.

  • Temporal imaging with the up-Conversion Time microscope
    Generation Amplification and Measurement of Ultrashort Laser Pulses II, 1995
    Co-Authors: C.v. Bennett, Ryan P Scott, Brian H. Kolner
    Abstract:

    ABSTRACTWe have demonstrated a temporal imaging system with a novel Time lens which magnifies 100 Gb/s optical data by a factor of twelve. The function of a Time lens is to impart a quadratic phase modulation or linear frequencysweep to the waveform under study. Our approach to achieving Time lens action is to up-convert the waveform under study using a linearly swept pump, thus imparting a linear frequency sweep to the waveform. This techniqueallows for much greater frequency sweep rates and hence shorter focal Times than can be obtained with electro-.opticmodulators. Additionally, the increased bandwidth that can be obtained optically instead of electro-optically shouldresult in higher resolution in a temporal imaging system.Keywords: temporal imaging, Time lens, Time microscope, ultrashort light pulses, ultrafast phenomenona.1. INTRODUCTIONThe direct measurement of ultrashort light pulses and waveforms is limited by current technology to several picoseconds resolution. New techniques for improving resolution generally concentrate on faster photodetectors

  • temporal magnification and reversal of 100 gb s optical data with an up Conversion Time microscope
    Applied Physics Letters, 1994
    Co-Authors: C.v. Bennett, Ryan P Scott, B.h. Kolner
    Abstract:

    We have developed an up‐Conversion Time microscope capable of expanding ultrafast optical wave forms to a Time scale accessible to ordinary sampling oscilloscopes. In this system, a 100 Gb/s optical word is magnified (slowed down) to a rate of 8.55 Gb/s with a Time lens placed between two dispersive delay lines. The Time lens is a nonlinear crystal which mixes the dispersed data with a linearly chirped pump pulse thus imparting a linear frequency sweep to the unconverted wave form. A second dispersive delay line completes the arrangement and forms the temporal analog of a single lens spatial imaging system resulting in a Time reversed wave form with a magnification M=−11.7.

  • Up-Conversion Time lens demonstrates 12/spl Times/ magnification of 100 Gb/s data
    Proceedings of LEOS'94, 1994
    Co-Authors: C.v. Bennett, R.p. Scott, B.h. Kolner
    Abstract:

    An up-Conversion Time lens has been demonstrated for the first Time. This type of Time lens is based on noncollinear up-Conversion of the signal with a linearly chirped pump. It has been used in a Time microscope system to produce a temporal magnification of M=-11.7. This technique should prove useful for allowing direct measurements of ultrashort waveforms by magnifying them to a Time scale accessible to current state-of-the-art instruments.

Tsung-heng Tsai - One of the best experts on this subject based on the ideXlab platform.

  • A 10-bit asynchronous SAR ADC with scalable Conversion Time in 0.18μm CMOS
    2016 IEEE International Symposium on Circuits and Systems (ISCAS), 2016
    Co-Authors: Po-chiang Tung, Tsung-heng Tsai
    Abstract:

    In this paper, a 10b 100-to-500 kS/s asynchronous SAR ADC is proposed and prototyped in 0.18 μm CMOS. The supply voltage is scaled down appropriately for different sampling speeds to minimize the power consumption. At a 0.5-V supply voltage and a 100 kS/s sampling rate, the ADC achieves a signal-to-noise and distortion ratio of 56.35 dB and consumes 424 nW, resultin g in a figure of merit of 7.9 fJ/Conversion-step. The ADC core occupies an active area of only 0.077 mm2.

  • ISCAS - A 10-bit asynchronous SAR ADC with scalable Conversion Time in 0.18μm CMOS
    2016 IEEE International Symposium on Circuits and Systems (ISCAS), 2016
    Co-Authors: Po-chiang Tung, Tsung-heng Tsai
    Abstract:

    In this paper, a 10b 100-to-500 kS/s asynchronous SAR ADC is proposed and prototyped in 0.18 μm CMOS. The supply voltage is scaled down appropriately for different sampling speeds to minimize the power consumption. At a 0.5-V supply voltage and a 100 kS/s sampling rate, the ADC achieves a signal-to-noise and distortion ratio of 56.35 dB and consumes 424 nW, resultin g in a figure of merit of 7.9 fJ/Conversion-step. The ADC core occupies an active area of only 0.077 mm2.

Sudhakar Mande - One of the best experts on this subject based on the ideXlab platform.

  • ICACCI - A novel approach in sar-adc for variable Conversion Time using window detector
    2017 International Conference on Advances in Computing Communications and Informatics (ICACCI), 2017
    Co-Authors: Mohd Iqbal Mohd Hadis, Sudhakar Mande
    Abstract:

    A 1 Volt, 8-bit, Successive Approximation Register Type ADC, with variable Conversion Time is implemented using FPGA SPARTAN-6 Board. The proposed ADC is design to achieve different number of Conversion cycle for different sample values. Input signal as triangular wave with both positive and negative cycle is taken, But the DAC used in feedback is design to give analog output only for positive cycle and response of the DAC for negative values is expected as zero because the proposed ADC gives code in unsigned formate. A subtractor and Window detector is used to generate EOC signal, Immediately in next clock cycle sample and hold signal, generated by the FPGA board, which will activate sample and hold circuit to pass another sample at the non-inverting input of the comparator for its Conversion and the process continues. For an error of 0.05 Volts, operating frequency of Conventional ADC is 15 Hz, While for the same error of 0.05 Volts Design ADC works efficiently upto 30Hz. Thus Design ADC can work over the frequency band which is double the frequency band of Conventional ADC.

  • A novel approach in sar-adc for variable Conversion Time using window detector
    2017 International Conference on Advances in Computing Communications and Informatics (ICACCI), 2017
    Co-Authors: Mohd Iqbal Mohd Hadis, Sudhakar Mande
    Abstract:

    A 1 Volt, 8-bit, Successive Approximation Register Type ADC, with variable Conversion Time is implemented using FPGA SPARTAN-6 Board. The proposed ADC is design to achieve different number of Conversion cycle for different sample values. Input signal as triangular wave with both positive and negative cycle is taken, But the DAC used in feedback is design to give analog output only for positive cycle and response of the DAC for negative values is expected as zero because the proposed ADC gives code in unsigned formate. A subtractor and Window detector is used to generate EOC signal, Immediately in next clock cycle sample and hold signal, generated by the FPGA board, which will activate sample and hold circuit to pass another sample at the non-inverting input of the comparator for its Conversion and the process continues. For an error of 0.05 Volts, operating frequency of Conventional ADC is 15 Hz, While for the same error of 0.05 Volts Design ADC works efficiently upto 30Hz. Thus Design ADC can work over the frequency band which is double the frequency band of Conventional ADC.