High speed integrating analog-to-digital converter

Details High speed integrating analog-to-digital converter High speed integrating analog-to-digital converter

1988-07-30

1990-07-10

Shoop, Jr., William M.

Coded data generation or conversion

Analog to or from digital conversion

Analog to digital conversion

341155, 341156, 341164, H03M 146, H03M 156

Patent

active

049409824

ABSTRACT:
Analog-to-digital converter is particularly for digital systems requiring a fast and accurate high resolution conversion of an analog input signal into a corresponding digital output code. A comparator compares the input signal against a ramp signal. A plurality of counters is responsive to the comparator for providing the output code. Each counter has a weight and counts subsequently to the counting of the counter having a higher weight. A digital-to-analog converter converts the output code from the counters into a reference signal prior to the counting of each counter. An integrator provides the ramp signal in reference to the reference signal and at a rate corresponding to the weight of the counter currently counting. A switch zeroes the integrator prior to the counting of each counter. An optional flash analog-to-digital converter estimates the input signal and determines an initial count of the counters.

REFERENCES:
patent: 3750142 (1973-07-01), Barnes et al.
patent: 3849775 (1974-11-01), Buchanan et al.
patent: 4243974 (1981-01-01), Mack
patent: 4544918 (1985-10-01), De Hann
patent: 4565992 (1986-01-01), Sakamoto et al.
patent: 4584566 (1986-04-01), Arcara
patent: 4734677 (1988-03-01), Cake et al.
patent: 4746901 (1988-05-01), Smith
patent: 4829302 (1989-05-01), Oitzl et al.

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