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System and circuitry to provide stable transconductance for biasing

  • US 8,299,844 B2
  • Filed: 03/19/2009
  • Issued: 10/30/2012
  • Est. Priority Date: 09/29/2005
  • Status: Active Grant
First Claim
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1. An amplifier system comprising:

  • an input amplifier configured to receive an analog input signal and provide an amplified signal corresponding to the analog input signal;

    a tracking loop configured to employ delta modulation for tracking the amplified signal, the tracking loop providing a corresponding output signal; and

    a biasing circuit configured to adjust a bias current to maintain stable transconductance over temperature variations, the biasing circuit providing at least one bias signal for biasing at least one of the input amplifier and the tracking loop, whereby circuitry receiving the at least one bias signal exhibits stable performance over the temperature variations.

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