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Active ripple and noise filter for telecommunication equipment powering

  • US 6,489,755 B1
  • Filed: 09/18/2000
  • Issued: 12/03/2002
  • Est. Priority Date: 09/18/2000
  • Status: Expired due to Term
First Claim
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1. A circuit for effectively reducing an unwanted AC component variation of a DC voltage to be applied to a load comprising:

  • a detector coupled to sense the average voltage value of low frequency variation of said DC voltage; and

    a controllable attenuator coupled in circuit between a source of said DC voltage and said load, and being operative to controllably attenuate the average voltage value sensed by said detector by an amount that is effective to provide a DC output voltage for application to said load in which said unwanted AC component variation has been effectively removed.

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