Patent ID: 6816003
Filing Date: 2004-11-09
Classification: H03F,H03H

Abstract:
An apparatus for processing a signal, comprising:a filter having at least one input and at least one bias, wherein the at least one input comprises: a first input for receiving a first input signal, and a second input for receiving a second input signal, wherein the filter is configured to perform the steps of: applying a first filtering operation to the first input signal, thereby generating a first output signal which is communicated to at least one output of the filter, the first filtering operation having a first frequency characteristic in which low frequencies are suppressed, and applying a second filtering operation to the second input signal, the second input signal controlling the at least one bias, the second filtering operation having a second frequency characteristic in which low frequencies are passed; and an envelope detector for receiving the first input signal for generating a signal representing an amplitude of the first input signal, the second input signal comprising the signal representing the amplitude of the first input signal.