CMOS flash analog-to-digital converter with hysteresis

Details CMOS flash analog-to-digital converter with hysteresis CMOS flash analog-to-digital converter with hysteresis

1993-08-17

1995-09-19

Williams, Howard L.

Coded data generation or conversion

Analog to or from digital conversion

Analog to digital conversion

341156, 341159, H03M 134

Patent

active

054519527

ABSTRACT:
A flash analog-to-digital converter has CMOS comparators that compare an analog input signal with internal reference voltages and produce internal output signals. Each comparison is performed according to the threshold voltage of an inverter. A threshold control circuit in each comparator adjusts this threshold voltage according to the internal output signal, thereby providing hysteresis. A logic circuit receives the internal output signals from all the comparators and generates a digital output signal. The hysteresis of the comparators keeps the digital output signal from oscillating between adjacent values when the analog input signal is near one of the internal reference voltages.

REFERENCES:
patent: 4539489 (1985-09-01), Vaughn
patent: 4547763 (1985-10-01), Flamm
patent: 4859873 (1989-08-01), O'Shaughnessy et al.
patent: 5341033 (1994-08-01), Koker
"Introduction to MOS LSI Design", Mavor et al. pp. 185-186.
"Monolithic Expandable 6 Bit 20 MHz CMOS/SOS A/D Converter," Dingwall, pp. 926-929, IEEE Journal of Solid-State Circuits, vol. SC-14, No. 6, Dec., 1979.
"Analysis of Reference Tap Voltage Variations in a Flash A/D Converter," Nakaya et al., The Transactions of the Institute of Electronics and Communication Engineers of Japan, vol. J69-C, No. 3, Mar. 1986, pp. 237-238.

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