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Papers by Greg Warwar

Research paper thumbnail of Phase selection circuit

Research paper thumbnail of Gallium arsenide voltage-controlled oscillator and oscillator delay cell

Research paper thumbnail of Clock recovery unit which uses a detected frequency difference signal to help establish phase lock between a transmitted data signal and a recovered clock signal

Research paper thumbnail of Adaptive Data Recovery System with Input Signal Equalization

Research paper thumbnail of High bandwidth clock buffer

Research paper thumbnail of Method and Circuitry for High Speed Buffering of Clock Signals

Research paper thumbnail of Clock recovery unit including a frequency detection circuit

Research paper thumbnail of Phase selection circuit

Research paper thumbnail of Core-excited alkali atoms and ionic excimers as VUV/XUV laser sources

This paper reports the first observation of fluorescence from the Cs(2+)F(-) state at 185 nm usin... more This paper reports the first observation of fluorescence from the Cs(2+)F(-) state at 185 nm using a laser-produced plasma as the excitation source. The dependence of the ionic excimer emission on CsF vapor pressure and temporally resolved emissions from Cs(2+)F(-) are reported. A method of pumping core-excited alkali atomic transitions using electron beam excitation is discussed.

Research paper thumbnail of Neutral and ionic excimer molecules produced by reactive kinetics in a laser-produced plasma

Optics Letters, 1989

The first observation to the authors' knowledge of excimer molecules formed by reactive k... more The first observation to the authors' knowledge of excimer molecules formed by reactive kinetics in a laser-produced plasma is reported. Emission from XeF at 351 nm and a new ionic excimer (XeRb)(+) at 165 nm have been observed.

Research paper thumbnail of The effect of dielectric relaxation on charge-redistribution A/D converters

IEEE Journal of Solid-State Circuits, 1990

In this paper we report the extent to which dielectric relaxation in typical monolithic capacitor... more In this paper we report the extent to which dielectric relaxation in typical monolithic capacitors degrades the performance of chargemedistrihution analog-to-digital (A/D) converters, We show experimental device data from a monolithic capacitor test circuit, describe an empirical capacitor model fit to the rneasnrements, and compare simulated A/D system errors with those observed in a monolithic, 10-b, 3.3m&s A/D converter. The excellent agreement found in this comparison demonstrates that the transient error in A/D-converter code transition voltages due to dielectric relaxation may be accurately predicted. The modeling and simulation techniques discussed are important tools both for the selection of proper capacitor technology and iu the development of circuit designs insensitive to dielectric relaxation. This analysis is also applicable to any circnit where precision is derived from capacitor characteristics, such as sample-and-hold circuits aud switchedcapacitor filters.

Research paper thumbnail of Self-calibration techniques for a second-order multibit sigma-delta modulator

IEEE Journal of Solid-State Circuits, 1993

Design techniques for self-calibration of the digitalto-analog converter DAC in a multibit sigma-... more Design techniques for self-calibration of the digitalto-analog converter DAC in a multibit sigma-delta modulator are described. When used in conjunction with dynamic element matching, self-calibration provides linearity performance suitable for digital audio applications. The dynamic element matching circuitry provides the mechanism of determining device mismatch for self-calibration. Practical circuit details and an effective calibration method are discussed. Test results from a 1-pm CMOS test chip are presented. In this test system, a second-order loop with a 3-b quantizer achieves an 89-dB dynamic range and-91-dB harmonic distortion after calibration. In addition, a new method of detecting the presence of tones is described, using the entropy of the spectrum of the decimation filter output.

Research paper thumbnail of Solid state excimer lasers

Le Journal de Physique IV, 1994

Research paper thumbnail of Electron beam excitation of rare-gas alkali ionic excimers

Applied Physics Letters, 1989

Research paper thumbnail of Phase selection circuit

Research paper thumbnail of Gallium arsenide voltage-controlled oscillator and oscillator delay cell

Research paper thumbnail of Clock recovery unit which uses a detected frequency difference signal to help establish phase lock between a transmitted data signal and a recovered clock signal

Research paper thumbnail of Adaptive Data Recovery System with Input Signal Equalization

Research paper thumbnail of High bandwidth clock buffer

Research paper thumbnail of Method and Circuitry for High Speed Buffering of Clock Signals

Research paper thumbnail of Clock recovery unit including a frequency detection circuit

Research paper thumbnail of Phase selection circuit

Research paper thumbnail of Core-excited alkali atoms and ionic excimers as VUV/XUV laser sources

This paper reports the first observation of fluorescence from the Cs(2+)F(-) state at 185 nm usin... more This paper reports the first observation of fluorescence from the Cs(2+)F(-) state at 185 nm using a laser-produced plasma as the excitation source. The dependence of the ionic excimer emission on CsF vapor pressure and temporally resolved emissions from Cs(2+)F(-) are reported. A method of pumping core-excited alkali atomic transitions using electron beam excitation is discussed.

Research paper thumbnail of Neutral and ionic excimer molecules produced by reactive kinetics in a laser-produced plasma

Optics Letters, 1989

The first observation to the authors' knowledge of excimer molecules formed by reactive k... more The first observation to the authors' knowledge of excimer molecules formed by reactive kinetics in a laser-produced plasma is reported. Emission from XeF at 351 nm and a new ionic excimer (XeRb)(+) at 165 nm have been observed.

Research paper thumbnail of The effect of dielectric relaxation on charge-redistribution A/D converters

IEEE Journal of Solid-State Circuits, 1990

In this paper we report the extent to which dielectric relaxation in typical monolithic capacitor... more In this paper we report the extent to which dielectric relaxation in typical monolithic capacitors degrades the performance of chargemedistrihution analog-to-digital (A/D) converters, We show experimental device data from a monolithic capacitor test circuit, describe an empirical capacitor model fit to the rneasnrements, and compare simulated A/D system errors with those observed in a monolithic, 10-b, 3.3m&s A/D converter. The excellent agreement found in this comparison demonstrates that the transient error in A/D-converter code transition voltages due to dielectric relaxation may be accurately predicted. The modeling and simulation techniques discussed are important tools both for the selection of proper capacitor technology and iu the development of circuit designs insensitive to dielectric relaxation. This analysis is also applicable to any circnit where precision is derived from capacitor characteristics, such as sample-and-hold circuits aud switchedcapacitor filters.

Research paper thumbnail of Self-calibration techniques for a second-order multibit sigma-delta modulator

IEEE Journal of Solid-State Circuits, 1993

Design techniques for self-calibration of the digitalto-analog converter DAC in a multibit sigma-... more Design techniques for self-calibration of the digitalto-analog converter DAC in a multibit sigma-delta modulator are described. When used in conjunction with dynamic element matching, self-calibration provides linearity performance suitable for digital audio applications. The dynamic element matching circuitry provides the mechanism of determining device mismatch for self-calibration. Practical circuit details and an effective calibration method are discussed. Test results from a 1-pm CMOS test chip are presented. In this test system, a second-order loop with a 3-b quantizer achieves an 89-dB dynamic range and-91-dB harmonic distortion after calibration. In addition, a new method of detecting the presence of tones is described, using the entropy of the spectrum of the decimation filter output.

Research paper thumbnail of Solid state excimer lasers

Le Journal de Physique IV, 1994

Research paper thumbnail of Electron beam excitation of rare-gas alkali ionic excimers

Applied Physics Letters, 1989

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