Correlated double scanner with several sample=and=hold circuit units

摘要

The sample-and-hold circuit units (8,14) scan a wide signal delivered from an image sensor system (2). They then transmit a preset DC voltage level signal. A circuit (60) clamps the video signal and engages the sample-and-hold circuit units. The scanner comprises a differential amplifier (18). There are several repeat scanning-hold circuit units (12,30,32) for repeated scanning of signals from the first units. A level correction stage (26,28) processor the units signals and transmits a signal with phase synchronised with repeat unit output signal. Scanning noise is removed by specified units (36,38).