Patent ID: 6931267

Claim:
A receiver, comprising: an amplification module for amplifying a received radio frequency (RF) signal to produce an amplified RF signal, wherein the amplification module is biased to a first bias level; a mixer module coupled to mix the amplified RF signal with a local oscillation to produce a down converted signal having a specified frequency wherein the mixer module is biased to a second bias level; a bandpass filter module operably coupled to receive and to bandpass filter the down converted signal to produce a filtered signal, wherein the bandpass filter module is biased to a third bias level; an analog-to-digital (A/D) converter module coupled to receive the filtered signal, the A/D converter module for converting the filtered signal from an analog domain to a digital domain, the A/D converter generating a digital bit stream, wherein the A/D converter module is biased to a fourth bias level; a processing module coupled to receive and process the digital bit stream, wherein the processing module is biased to a fifth bias level; logic circuitry coupled to power down at least a portion of one of the amplification module, the mixer module, the bandpass filter module, the A/D converter module, and the processing module during a specified mode of operation and coupled to power up any module powered down during the specified mode of operation whenever the receiver begins to receive the RF signal; and a bias filtering module coupled to at least one of the amplification module, the mixer module, the bandpass filter module, the A/D converter module and the processing module to provide therefor at least one of the first bias level, second bias level, third bias level, fourth bias level based, and fifth bias level on a voltage dependent filter function, wherein the bias filtering module, for the at least one of the first bias level, the second bias level, the third bias level, the fourth bias level, and the fifth bias level, provides an initial bias level within a specified settle time, relative to a trigger event, for enabling fast power up and further provides a final bias level for improved filtering.