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Post amplifier with selectable gain

  • US 8,130,035 B2
  • Filed: 06/12/2009
  • Issued: 03/06/2012
  • Est. Priority Date: 09/15/2003
  • Status: Active Grant
First Claim
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1. A selectable gain amplifier comprising:

  • two or more selectable gain stages, each gain stage having a first input coupled to receive an input signal, a second input, and an output; and

    two or more feedback paths coupled between the outputs and the second inputs of the selectable gain stages;

    where each selectable gain stage includes a transconductance (gm) cell arranged to be selectively enabled by applying a bias current or disabled by removing the bias current to the gm cell.

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