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Switched active bias control and power-on sequencing circuit for an amplifier

  • US 8,319,560 B2
  • Filed: 10/01/2010
  • Issued: 11/27/2012
  • Est. Priority Date: 10/05/2009
  • Status: Active Grant
First Claim
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1. An active bias control circuit for an amplifier, comprising:

  • a switch including a switching transistor responsive to a supply voltage for providing an input current to the input of the amplifier;

    a level shifter for biasing the switching transistor;

    a current sense circuit coupled to the switch for sensing a scaled down replica of the input current to the amplifier; and

    a first amplifier control circuit responsive to the current sense circuit for adjusting a first control voltage to the amplifier in response to the sensed, scaled down replica of the input current to regulate the input current to the amplifier.

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