Imaging apparatus with means for cancelling differential...

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

H - Electricity

04

N

350/48

H04N 5/217 (2006.01) H04N 3/15 (2006.01)

Patent

CA 2006711

- 19- ABSTRACT OF THE DISCLOSURE 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.

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