Noise cancelling circuit for pixel signals and an image pickup d

Details Noise cancelling circuit for pixel signals and an image pickup d Noise cancelling circuit for pixel signals and an image pickup d

1997-02-28

1999-11-23

Garber, Wendy

Television

Camera, system and detail

Combined image signal generator and general image signal...

348311, H04N 964

Patent

active

059909480

ABSTRACT:
The elimination of noise can be positively achieved by a simpler arrangement. For this reason, a capacitor holds a difference between a level at a first time point of an input signal and a reference potential of a given level. A capacitor holds a difference between a level at a second time point of the input signal and a threshold value of an inverter serving as a comparator. The first and second capacitors are switched to a series-connected state. With a combined voltage of holding voltages on the first and second capacitors as an input-side voltage to the inverter, a reference voltage Vref varies as a bias through the input-side voltage. When the output of the inverter is inverted during a portion of a time in which the reference voltage varies, a controller enables the holding of a measurement value corresponding to the reference voltage, the measurement value being used as a variation corresponding to the input signal.

REFERENCES:
patent: 5461425 (1995-10-01), Fowler et al.
patent: 5717458 (1998-02-01), Yonemoto

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