Low 1/f noise amplifier for CCD imagers
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United States of America Patent
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-
Mar 21, 1989
Grant Date -
N/A
app pub date -
Sep 24, 1987
filing date -
Sep 24, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A low 1/f noise amplifier has been provided for an output of a CCD imager. To reduce clock noise, the amplifier employs a differential detection scheme. Linear stages (54, 76) are coupled by capacitors (60, 82) to a differential amplifier (64). Differential amplifier (64) employs a first (112, 118) and a second (172, 198) differential transistor pair. The second differential pair (172, 198) is cross-coupled to the outputs of the first differential pair (112, 118) by load resistances (180, 206) with the voltage drop across them remaining substantially constant. To maintain stability, the positive and negative branches of the amplifier are periodically reset by a resetter (210). The input nodes (62, 86) are periodically reset to a voltage reference.
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