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DC-DC converter switching transistor current measurement technique

  • US 8,134,548 B2
  • Filed: 06/30/2005
  • Issued: 03/13/2012
  • Est. Priority Date: 06/30/2005
  • Status: Active Grant
First Claim
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1. An apparatus, comprising:

  • a) a switching transistor;

    b) a pair of transistors having their conductive channels coupled in series, a drain of one of said pair of transistors coupled to one end of said switching transistor'"'"'s conductive channel, a source of the other of said pair of transistors coupled to the other end of said switching transistor'"'"'s conductive channel, and a source of the one of said pair of transistors coupled in series to a drain of the other of said pair of transistors; and

    ,c) a node between said pair of transistors coupled to an input of an amplifier; and

    d) a second pair of transistors having their conductive channels coupled in parallel, a node between said second pair of transistors coupled to a reference input of said amplifier, wherein a transistor of said first pair of transistors is designed to be matched to a transistor of said second pair of transistors.

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