Semi-flash A/D converter using switched capacitor comparators

Details Semi-flash A/D converter using switched capacitor comparators Semi-flash A/D converter using switched capacitor comparators

1989-01-30

1994-10-11

Logan, Sharon D.

Coded data generation or conversion

Analog to or from digital conversion

Analog to digital conversion

341159, 341172, H03M 136, H03M 144, H03M 150

Patent

active

053551354

ABSTRACT:
Comparators for use in a semi-flash analog-to-digital converter utilize switched capacitor inputs for effecting a subtraction of charge corresponding to the subtraction of voltages to obtain the most significant bit comparisons and least significant bit comparisons. In a preferred embodiment, a 6-input switched-capacitor comparator is employed in which an analog input signal, a most significant reference TAP, and the output from a digital-to-analog converter are sequentially coupled through a first capacitor to the input of an inverting amplifier. A second plurality of input terminals sequentially connects one-half the least significant bit reference potential, 0 volts, and a least significant reference voltage TAP through second capacitive means to the input of the inverting amplifier. One comparator can thereby perform both a most significant bit comparison and a least significant bit comparison in a semi-flash mode of operation.

REFERENCES:
patent: 4124844 (1978-11-01), Black et al.
patent: 4639715 (1987-01-01), Doluca
patent: 4658198 (1987-04-01), Thurber, Jr.
patent: 4748440 (1988-05-01), Kobayashi
patent: 4827191 (1989-05-01), Chapman

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