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RIPPLE FILTER CIRCUIT

  • US 20070103838A1
  • Filed: 11/07/2006
  • Published: 05/10/2007
  • Est. Priority Date: 11/07/2005
  • Status: Active Grant
First Claim
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1. A ripple filter circuit for eliminating ripple, the ripple filter circuit comprising:

  • a driving transistor, connected to a power supply line, for supplying output voltage to a driving subject connected to a ground line;

    a reference transistor and a dummy load connected in series between the power supply line and the ground line, wherein the reference transistor functions as a replica of the driving transistor, and the dummy load corresponds to load of the driving subject;

    a compensation circuit, connected to a gate terminal of the reference transistor, for canceling a characteristic variation in the reference transistor, wherein the compensation circuit provides its output to a gate terminal of the drive transistor via a low pass filter.

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