Circuit converting a pair of differential input signals to singl

Details Circuit converting a pair of differential input signals to singl Circuit converting a pair of differential input signals to singl

1980-09-12

1982-08-31

Murray, Richard

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

330261, H04N 518

Patent

active

043475310

ABSTRACT:
A signal converting circuit, which has particular application as a pedestal clamp circuit for a video signal, includes a differential amplifier having a pair of transistors which produce first and second differential currents at the respective collectors thereof; a first circuit supplied with the first differential current and including a diode and a first resistor having a first resistance value connected in series between the collector of one of the transistors of the differential amplifier and a reference potential; a second circuit supplied with the second differential current and including a second resistor having a second resistance value and a transistor having its collector emitter path connected in series with the second resistor between the collector of the other transistor of the differential amplifier and the reference potential; and an output circuit for producing an output current in response to the second differential current and including a current mirror transistor having its base-collector path connected in parallel with the collector-emitter path of the transistor of the second circuit, wherein the current gain of the signal converting circuit is controlled by the resistance values of the first and second resistors.

REFERENCES:
patent: 4178558 (1979-12-01), Nagashima et al.

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