Patent ID: 8542066
Filing Date: 2013-09-24
Classification: H03F

Abstract:
1. An apparatus, comprising: an amplifier configured to amplify an input signal to generate an amplified signal, wherein the amplifier comprises a bias circuit including a biasing capacitor and a voltage-controlled current source for generating a bias current, wherein the bias circuit is configured to control a magnitude of the bias current of the amplifier based at least partly on a voltage across the biasing capacitor; and a sampling circuit configured to sample the amplified signal generated by the amplifier, wherein the sampling circuit is configured to generate an output signal based on a difference between a first sample of the amplified signal taken at a first time instance and a second sample of the amplified signal taken at a second time instance after the first time instance, wherein the bias circuit is configured to sample a bias voltage onto the biasing capacitor before the first time instance, and wherein the bias circuit is configured to hold the voltage across the biasing capacitor substantially constant between the first time instance and the second time instance.