Patent ID: 7013117

Claim:
A radio receiver formed in an integrated circuit, comprising: a low noise amplifier (LNA) coupled to receive a radio frequency (RF) signal from an antenna; a pair of mixers coupled to receive an output of the LNA, the mixers for down converting the received RF signal to baseband; a pair of filters for receiving down converted signals from the mixers; logic circuitry for providing gain level control signals; at least one programmable gain amplifier (PGA) for providing controlled gain steps according to the gain level control signals received from the logic circuitry; and an analog peak detection circuit coupled to receive filtered I and Q baseband signals from the filters having an output voltage characterized by a square root of the sum of the squares of the magnitude of the I and Q components, wherein the analog peak detection circuit further comprises four inputs to receive one of each of four signal components of a quadrature phase shift keyed communication signal.