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Amplifier with feedback having high power supply rejection

  • US 5,365,199 A
  • Filed: 08/02/1993
  • Issued: 11/15/1994
  • Est. Priority Date: 08/02/1993
  • Status: Expired due to Term
First Claim
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1. A CMOS amplifier with feedback having high power supply rejection, comprising:

  • an amplifier stage having first and second input terminals and an output terminal;

    a stabilizing capacitor having a first plate electrode coupled to the output terminal of the amplifier stage, and a second plate electrode coupled to an analog ground terminal;

    a source-follower transistor having a gate coupled to the output terminal of the amplifier stage for receiving an input signal, a source for providing an output signal, and a drain having a drain current; and

    a negative feedback circuit, coupled between the source and the drain of the source-follower transistor, for detecting variations in the drain current of the source-follower transistor due to changes in a load current, and in response to detecting a variation in the drain current, providing negative current feedback to the source of the source-follower transistor to limit the variations in the drain current.

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