Output circuit for a digital correlator

Details Output circuit for a digital correlator Output circuit for a digital correlator

1977-04-04

1978-06-27

Anagnos, Larry N.

Communications: electrical

Digital comparator systems

307221R, 307297, 328 93, 328110, 328186, 364728, 364824, G06F 704, G05B 103, H03K 402, H03K 520

Patent

active

040978443

ABSTRACT:
An analog output circuit for a digital correlator that may be completely integrated with the digital correlator on a single CMOS/LSI chip. The output circuit includes a compensating arrangement so that its output voltage is substantially unaffected by internal processing variables between different chips or by external variables such as temperature or supply voltages. The circuit includes a reference MOS unit and a correlation MOS unit each including parallel arranged PMOS transistors respectively coupled in series with first and second NMOS transistors. An operational amplifier biased to a voltage V.sub.REF is coupled between the reference MOS unit and the gates of the first and second NMOS transistors. The circuit operates to bias the gate of the second NMOS transistor so that constant output voltage steps are provided in the series path between the correlation MOS unit and the second NMOS transistor as long as variations of operating parameters track each other uniformly between the PMOS units and between the NMOS transistors.

REFERENCES:
patent: 3517175 (1970-06-01), Williams
patent: 3598979 (1971-08-01), Moreau
patent: 3622987 (1971-11-01), Borkan
patent: 3670151 (1972-06-01), Lindsay et al.
patent: 3760355 (1973-09-01), Bruckert
patent: 3831013 (1974-08-01), Alsup et al.
patent: 3935439 (1976-01-01), Buss et al.
patent: 3970875 (1976-07-01), Leehan
patent: 3978473 (1976-08-01), Pastoriza
patent: 4016434 (1977-04-01), De Filippi

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