Imaging apparatus with means for cancelling differential offset

Details Imaging apparatus with means for cancelling differential offset Imaging apparatus with means for cancelling differential offset

1989-12-27

1991-06-18

Britton, Howard W.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358167, 35821329, H04N 314, H04N 5335, H04N 5213

Patent

active

050253182

ABSTRACT:
In an imaging apparatus, bipolar clock pulses are generated for driving the odd-and-even-number second shift registers of a linear charge transfer device. A voltage representing the difference between offset voltages generated respectively by the shift registers is generated by a band-pass filter or a differential circuit and multiplied with the bipolar clock pulses to produce a varying voltage of a particular polarity determined by the relative value of the offset voltages. The varying voltage is smoothed into a DC voltage by a low-pass filter. The DC voltage of appropriate polarity is combined with one of the output signals of the shift registers so that the difference between the offset voltages substantially reduces to zero through a feedback loop.

REFERENCES:
patent: 4307423 (1981-12-01), Atherton
patent: 4710816 (1987-12-01), Yabumoto

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