Analog-to-digital and digital-to-analog converter

Details Analog-to-digital and digital-to-analog converter Analog-to-digital and digital-to-analog converter

1989-02-01

1990-03-13

Shoop, Jr., William M.

Coded data generation or conversion

Reversible analog to digital converters

341150, 341172, H03M 102

Patent

active

049086200

ABSTRACT:
An analog-to-digital and digital-to-analog converter includes an array of capacitors each being differently weighed from the others, one electrode of each of the capacitors being connected to a common node. Switches are provided for selectively applying, in response to a first control signal, an analog input applied to an analog input terminal and a plurality of reference voltages to the other electrode of the capacitors. A comparator has a pair of input terminals whose inverting and non-inverting inputs are selectively switched over with respect to polarity in response to a second control signal. The comparator compares a voltage appearing on the node and applied to one of the input terminals and one of the reference voltages applied to the other input terminal. An analog output terminal is connected to the output of the comparator. A successive comparison register sequentially takes in outputs of the comparator in response to a third control signal. A latch selectively takes in and temporarily holds one of digital inputs applied via a digital input terminal and outputs of the successive comparison register in response to the second control signal. A digital output terminal is connected to the output of the latch. The first and third control signals are generated by a timing generating circuit in response to an output of the latch.

REFERENCES:
patent: 4348768 (1982-07-01), Svala
patent: 4350975 (1982-09-01), Haque et al.
patent: 4380756 (1983-04-01), Worsman
patent: 4385286 (1983-05-01), Haque
patent: 4404544 (1983-09-01), Dwarakanath
patent: 4622536 (1986-11-01), Shih et al.

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