Bruce A. Wooley

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A 14-bit digital-to-analog converter based on a fourth-order multibit sigma–delta modulator is described. The digital modulator is pipelined to minimize both its power dissipation and design complexity. The 6-bit output of this modulator is converted to analog using 64 current-steering cells that are continuously calibrated to a reference current. This(More)
A high-precision, low-voltage, low-power Σ∆ modulator has been designed using a delayed input feedforward architecture and a tracking multi-bit quantizer employing a single comparator. A 0.18-μm CMOS experimental prototype achieves 100 dB of dynamic range, 100-dB peak SNR and 95dB peak SNDR for a signal bandwidth of 25 kHz, while consuming only 870 μW of(More)
GaAs photoconductive switches have been integrated with two parallel 4-bit CMOS analog-to-digital (A/D) converter channels to demonstrate the time-interleaved sampling of wideband signals. The picosecond sampling aperture provided by lowtemperature-grown-GaAs metal-semiconductor-metal switches, in combination with low-jitter short-pulse lasers, enables the(More)