The Experts below are selected from a list of 1011 Experts worldwide ranked by ideXlab platform

Cam Nguyen - One of the best experts on this subject based on the ideXlab platform.

  • A ultra-wideband fully integrated CMOS sampling receiver frontend
    2010 IEEE Antennas and Propagation Society International Symposium, 2010
    Co-Authors: C. Huynh, Cam Nguyen
    Abstract:

    A new ultra-wideband 0.18-μm CMOS sampling receiver frontend was developed. It includes a low-noise amplifier (LNA) and a sampler and achieves high gain, fast sampling, low noise figure, low power consumption, and enhanced RF-power efficiency. The LNA and sample-and-Hold Capacitor are switched using two synchronized strobes generated on-chip. Measured results show performance of 9 to 12 dB voltage conversion gain, 16 to 25 dB noise figure, and power consumption of only 21.6 mW (with buffer) and 11.7 mW (without buffer) across DC to 3.5 GHz with 100-MHz sampling frequency.

  • An Ultra-Wideband Low Power-Consumption Low Noise-Figure High-Gain RF Power-Efficient DC–3.5-GHz CMOS Integrated Sampling Mixer Subsystem
    IEEE Transactions on Microwave Theory and Techniques, 2008
    Co-Authors: Cam Nguyen
    Abstract:

    An ultra-wideband CMOS integrated sampling mixer subsystem was designed and fabricated using Jazz Semiconductor's 0.18-mum enhanced RF CMOS process. A two-stage switching strategy is implemented to synchronously merge a low-noise amplifier (LNA) with a sampler to achieve high gain, fast sampling, low noise figure, low power consumption, and enhanced RF power efficiency. The LNA and sample-and-Hold Capacitor are switched using two synchronized strobes generated on-chip. Characteristics of the sampling strobe, the sampling clock jitter, and their effects on the sampling bandwidth are discussed. Measured results show unprecedented performance of 9-12-dB voltage conversion gain, 16-25-dB noise figure, and power consumption of only 21.6 mW (with buffer) and 11.7 mW (without buffer) across dc to 3.5 GHz with 100-MHz sampling frequency.

R. Urata - One of the best experts on this subject based on the ideXlab platform.

  • High-speed sample and Hold using low temperature grown GaAs MSM switches for photonic A/D conversion
    Technical Digest. Summaries of papers presented at the Conference on Lasers and Electro-Optics. Postconference Technical Digest (IEEE Cat. No.01CH3717, 2001
    Co-Authors: R. Urata, R. Takahashi, V.a. Sabnis, D.a.b. Miller, J.s. Harris
    Abstract:

    Summary form only given. With the evergrowing demand for bandwidth, the need for high-speed A/D converters operating at GSa/s sampling rates has emerged in the areas of radar and microwave communications. As a solution, the idea of combining the low jitter and high speed advantages of photonics with electrical A/D converters has spawned a number of photonic A/D conversion systems. In our system, we utilize a sample and Hold scheme with LT grown GaAs MSM switches. The short recombination lifetime and high mobility of LT GaAs allow high-speed operation with good sensitivity. Optically triggered by a short-pulse laser, the switches would be attached to a transmission line and would sample the input electrical signal onto a Hold Capacitor.

  • Ultrafast differential sample and Hold using low temperature grown GaAs MSM for photonic A/D conversion
    Conference on Lasers and Electro-Optics (CLEO 2000). Technical Digest. Postconference Edition. TOPS Vol.39 (IEEE Cat. No.00CH37088), 2000
    Co-Authors: R. Urata, R. Takahashi, V.a. Sabnis, D.a.b. Miller
    Abstract:

    Summary form only given.Many proposed photonic ADC systems consist of an input electrical signal biasing an optical modulator whose output is optically demultiplexed to an array of electrical ADCs. However, the speed and linearity of the optical modulator limit the performance of these systems. To circumvent this problem, we propose a sample and Hold scheme utilizing LT grown GaAs MSM switches. The short recombination lifetime and high mobility of LT grown GaAs allow high-speed operation with good sensitivity. Optically triggered by a short pulse laser, the switches would be attached to a transmission line and would sample the input electrical signal onto a Hold Capacitor.

  • Ultrafast sampling using low temperature grown GaAs MSM switches integrated with CMOS amplifier for photonic A/D conversion
    The 15th Annual Meeting of the IEEE Lasers and Electro-Optics Society, 1
    Co-Authors: R. Urata, R. Takahashi, D.a.b. Miller, L.y. Nathawad, Bruce A. Wooley, J.s. Harris
    Abstract:

    Summary form only given. In our system, we utilize an optically triggered, electrical sample and Hold scheme with low temperature (LT) grown GaAs MSM switches. The switch is attached to a transmission line and samples the input electrical signal onto a Hold Capacitor when optically activated by a short-pulse laser. An electrical A/D converter then digitizes the held signal. By time-interleaving a number of these channels, the aggregate sampling rate of the system is increased, with the larger bandwidth requirements being placed on the input sample and Hold. In this work, we demonstrate LT GaAs MSM switches integrated with a front-end CMOS buffer amplifier stage with linear sampling capability from dc to 20 GHz input frequency. To our knowledge, this represents the highest bandwidth of any integrated system with CMOS technology.

Yong Kang - One of the best experts on this subject based on the ideXlab platform.

  • Effects of visible light on a readout integrated circuit for GaN-based UV focal plane array
    Semiconductor Science and Technology, 2005
    Co-Authors: Hanxin Jia, Yong Kang
    Abstract:

    GaN detector arrays are hybridized to a Si readout integrated circuit (ROIC) using flip-chip bonding techniques. GaN is transparent for visible light. Then, visible light will be absorbed by the Si ROIC. It can affect the performance of the ROIC. In this paper, we discuss the mechanism of these effects: under visible light illumination, during the integration period, the photocurrents generated by the PMOS reset switch and NMOS test switch are accumulated by the integration Capacitor, while during the readout period, the photocurrent generated by the PMOS sampling switch is accumulated by the sample/Hold Capacitor. These effects can be reduced by covering an extra aluminium layer on the top of the readout circuit, which is proved to be effective by experiment.

D.a.b. Miller - One of the best experts on this subject based on the ideXlab platform.

  • High-speed sample and Hold using low temperature grown GaAs MSM switches for photonic A/D conversion
    Technical Digest. Summaries of papers presented at the Conference on Lasers and Electro-Optics. Postconference Technical Digest (IEEE Cat. No.01CH3717, 2001
    Co-Authors: R. Urata, R. Takahashi, V.a. Sabnis, D.a.b. Miller, J.s. Harris
    Abstract:

    Summary form only given. With the evergrowing demand for bandwidth, the need for high-speed A/D converters operating at GSa/s sampling rates has emerged in the areas of radar and microwave communications. As a solution, the idea of combining the low jitter and high speed advantages of photonics with electrical A/D converters has spawned a number of photonic A/D conversion systems. In our system, we utilize a sample and Hold scheme with LT grown GaAs MSM switches. The short recombination lifetime and high mobility of LT GaAs allow high-speed operation with good sensitivity. Optically triggered by a short-pulse laser, the switches would be attached to a transmission line and would sample the input electrical signal onto a Hold Capacitor.

  • Ultrafast differential sample and Hold using low temperature grown GaAs MSM for photonic A/D conversion
    Conference on Lasers and Electro-Optics (CLEO 2000). Technical Digest. Postconference Edition. TOPS Vol.39 (IEEE Cat. No.00CH37088), 2000
    Co-Authors: R. Urata, R. Takahashi, V.a. Sabnis, D.a.b. Miller
    Abstract:

    Summary form only given.Many proposed photonic ADC systems consist of an input electrical signal biasing an optical modulator whose output is optically demultiplexed to an array of electrical ADCs. However, the speed and linearity of the optical modulator limit the performance of these systems. To circumvent this problem, we propose a sample and Hold scheme utilizing LT grown GaAs MSM switches. The short recombination lifetime and high mobility of LT grown GaAs allow high-speed operation with good sensitivity. Optically triggered by a short pulse laser, the switches would be attached to a transmission line and would sample the input electrical signal onto a Hold Capacitor.

  • Ultrafast sampling using low temperature grown GaAs MSM switches integrated with CMOS amplifier for photonic A/D conversion
    The 15th Annual Meeting of the IEEE Lasers and Electro-Optics Society, 1
    Co-Authors: R. Urata, R. Takahashi, D.a.b. Miller, L.y. Nathawad, Bruce A. Wooley, J.s. Harris
    Abstract:

    Summary form only given. In our system, we utilize an optically triggered, electrical sample and Hold scheme with low temperature (LT) grown GaAs MSM switches. The switch is attached to a transmission line and samples the input electrical signal onto a Hold Capacitor when optically activated by a short-pulse laser. An electrical A/D converter then digitizes the held signal. By time-interleaving a number of these channels, the aggregate sampling rate of the system is increased, with the larger bandwidth requirements being placed on the input sample and Hold. In this work, we demonstrate LT GaAs MSM switches integrated with a front-end CMOS buffer amplifier stage with linear sampling capability from dc to 20 GHz input frequency. To our knowledge, this represents the highest bandwidth of any integrated system with CMOS technology.

J.s. Harris - One of the best experts on this subject based on the ideXlab platform.

  • High-speed sample and Hold using low temperature grown GaAs MSM switches for photonic A/D conversion
    Technical Digest. Summaries of papers presented at the Conference on Lasers and Electro-Optics. Postconference Technical Digest (IEEE Cat. No.01CH3717, 2001
    Co-Authors: R. Urata, R. Takahashi, V.a. Sabnis, D.a.b. Miller, J.s. Harris
    Abstract:

    Summary form only given. With the evergrowing demand for bandwidth, the need for high-speed A/D converters operating at GSa/s sampling rates has emerged in the areas of radar and microwave communications. As a solution, the idea of combining the low jitter and high speed advantages of photonics with electrical A/D converters has spawned a number of photonic A/D conversion systems. In our system, we utilize a sample and Hold scheme with LT grown GaAs MSM switches. The short recombination lifetime and high mobility of LT GaAs allow high-speed operation with good sensitivity. Optically triggered by a short-pulse laser, the switches would be attached to a transmission line and would sample the input electrical signal onto a Hold Capacitor.

  • Ultrafast sampling using low temperature grown GaAs MSM switches integrated with CMOS amplifier for photonic A/D conversion
    The 15th Annual Meeting of the IEEE Lasers and Electro-Optics Society, 1
    Co-Authors: R. Urata, R. Takahashi, D.a.b. Miller, L.y. Nathawad, Bruce A. Wooley, J.s. Harris
    Abstract:

    Summary form only given. In our system, we utilize an optically triggered, electrical sample and Hold scheme with low temperature (LT) grown GaAs MSM switches. The switch is attached to a transmission line and samples the input electrical signal onto a Hold Capacitor when optically activated by a short-pulse laser. An electrical A/D converter then digitizes the held signal. By time-interleaving a number of these channels, the aggregate sampling rate of the system is increased, with the larger bandwidth requirements being placed on the input sample and Hold. In this work, we demonstrate LT GaAs MSM switches integrated with a front-end CMOS buffer amplifier stage with linear sampling capability from dc to 20 GHz input frequency. To our knowledge, this represents the highest bandwidth of any integrated system with CMOS technology.