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Wide frequency band coupling network for an active ripple and noise filter

  • US 4,594,648 A
  • Filed: 11/28/1984
  • Issued: 06/10/1986
  • Est. Priority Date: 11/28/1984
  • Status: Expired due to Fees
First Claim
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1. A filter for filtering ripple and noise voltages from a DC voltage, said filter comprising:

  • a common terminal, an input terminal and an output terminal;

    voltage sensing means for producing a sense signal which is proportional to an output voltage at said output terminal;

    an active filtering circuit having an input for receiving said sense signal and an output terminal, said active filtering circuit being adapted to generate at said output terminal of said circuit a correction signal having a magnituide and waveform such that coupling said correction signal onto said output terminal of said filter tends to reduce said ripple and noise voltages;

    a passive coupling element connected between said output terminal of said active filtering circuit and said output terminal of said filter; and

    a passive filter element connected between said output terminal and said common terminal of said filter, said passive coupling element and said passive filter element having nearly identical electrical characteristics.

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