Charge detecting circuit

Details Charge detecting circuit Charge detecting circuit

1986-07-28

1988-08-09

Ng, Jin F.

Facsimile and static presentation processing

Facsimile

Recording apparatus

35821315, H04N 314

Patent

active

047631970

ABSTRACT:
A charge detecting circuit includes a plurality of photodiodes, and a first multiplexer having a plurality of inputs connected to the photodiodes, respectively and operative to selectively connect one of its inputs to its output. Further, there are provided dummy capacitors of the same number as that of the photodiodes, each of the dummy capacitors having substantially the same capacitance as one corresponding photodiode, and a second multiplexer having a plurality of inputs connected to the dummy capacitors respectively, and operative to connect one of its inputs to its output. A differential amplifier is connected at its first input to the output of the first multiplexer and at its a second input to the output of the second multiplexer, so as to generate a photodetection signal.

REFERENCES:
patent: 4293877 (1981-10-01), Tsunekawa et al.
patent: 4484223 (1984-11-01), Tsunekawa
patent: 4562475 (1985-12-01), Levine

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