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Signal level control circuit having alternately switched capacitors in the feedback branch

  • US 5,014,130 A
  • Filed: 07/24/1990
  • Issued: 05/07/1991
  • Est. Priority Date: 07/31/1989
  • Status: Expired due to Fees
First Claim
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1. An amplitude controlling circuit for video signals output on a video signal path, the video signals providing image frequency pulses during a frame flyback sequence, comprising:

  • (a) a first control device coupled in line with the video signal path and having a video signal output;

    (b) a second control device providing an actual value of an input signal to said first device, the input signal being derived from the video signal output;

    (c) a first capacitor charged by the video signal;

    (d) a first switch coupled in parallel with the first capacitor;

    (e) a second capacitor having a charging voltage substantially equal to the actual value of the input signal;

    (f) a second switch coupled in series between the first and second capacitors wherein at least two consecutive control pulses are generated from the image frequency pulses, the first of said control pulses closing the second switch while the first switch is open and the second of said control pulses closing the first switch while the second switch is open.

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