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Controlled gain amplifier with variable control exponent

  • US 6,031,421 A
  • Filed: 07/22/1998
  • Issued: 02/29/2000
  • Est. Priority Date: 07/22/1998
  • Status: Expired due to Term
First Claim
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1. A controlled-gain amplifier comprising:

  • a pulse width modulation (PWM) regulator responsive to an error signal produced by comparing a gain control voltage Vc to a PWM feedback voltage Vave to produce a clock signal having a duty cycle determined by the applied control voltage Vc ;

    At least one switched amplifier stage, each stage being connected to the clock signal from the PWM regulator and having a gain proportional to the duty cycle of the clock signal.

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