Automatic level control circuit for an ad convertor

Details Automatic level control circuit for an ad convertor Automatic level control circuit for an ad convertor

1988-02-11

1989-10-17

Shoop, Jr., William M.

Coded data generation or conversion

Analog to or from digital conversion

Analog to digital conversion

341139, 341163, H03M 178

Patent

active

048750492

ABSTRACT:
An automatic level control circuit for a multi-level quadrature amplitude-modulated (QAM) demodulator having a QAM detector, which produces baseband in-phase (P) and quadrature (Q) signals in response to an input QAM camer wave, and two analog-digital (A/D) convertors which convert the Q and P signals into two parallel digital signals. Automatic level control of the input level of the baseband signal to the A/D convertor is maintained constant by the combination of a reference signal generator in a feed back loop with each A/D convertor. The A/D convertor produces a decoded digital signal and the reference voltage generator, in response to those signals, provides reference voltage to the A/D convertor that are optimized in response to variations in input signal level.

REFERENCES:
patent: 3544779 (1970-12-01), Farrow
patent: 3872434 (1975-03-01), Duvall
patent: 4110745 (1978-08-01), Ninomiya
patent: 4419657 (1983-12-01), Gagnon
patent: 4475210 (1984-10-01), Couch
patent: 4523180 (1985-06-01), Kuboki et al.
patent: 4635036 (1987-01-01), Yoshizawa

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