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System including an offset voltage adjusted to compensate for variations in a transistor

  • US 8,278,893 B2
  • Filed: 07/16/2008
  • Issued: 10/02/2012
  • Est. Priority Date: 07/16/2008
  • Status: Active Grant
First Claim
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1. A system, comprising:

  • a first transistor having a first control input and configured to regulate an output voltage;

    a first capacitor directly connected at one end to the first control input and directly connected at another end to a circuit reference; and

    a circuit configured to provide a first voltage to the first control input, wherein the circuit comprises;

    a first compensation circuit configured to provide an offset voltage that is part of the first voltage and referenced to the output voltage, wherein the first compensation circuit includes a compensation transistor that is similar to the first transistor such that variations in temperature and process changes affect both the compensation transistor and the first transistor and the compensation transistor is configured to vary the offset voltage to compensate for the variations in temperature and the process changes in the first transistor.

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