A/D converter with a main range up/down counter and a subrange A

Details A/D converter with a main range up/down counter and a subrange A A/D converter with a main range up/down counter and a subrange A

1989-05-02

1991-05-07

Shoop, Jr., William M.

Coded data generation or conversion

Analog to or from digital conversion

Analog to digital conversion

341159, 341155, H03M 140, H03M 136, H03M 146

Patent

active

050140566

ABSTRACT:
A fast, high-resolution A/D converter circuit includes a combination of a main-range up/down counter and a subrange A/D converter. An output from the up/down counter for upper bits is D/A-converted and subtracted from an input signal, and the remainder of subtraction is A/D-converted by the subrange A/D converter, thereby obtaining high-resolution conversion data. The circuit has a feedback loop which detects that the remainder becomes less than LSB of the up/down counter and stops a count operation. By discriminating that the remainder is more/less a predetermined level set higher than the LSB of the counter or outside/inside a predetermined range, a count rate is switched between high and low rates. The remainder enters subrange via the low rate count stage.

REFERENCES:
patent: 4517550 (1985-05-01), Nakamura
patent: 4544918 (1985-10-01), De Haan

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