Patent ID: 7110736

Claim:
A radio receiver formed in an integrated circuit, comprising: a low noise amplifier (LNA) coupled to receive an RF signal from an antenna, the LNA for providing amplification of the RF signal in accordance with control commands; mixer circuitry coupled to receive an amplified RF signal from the LNA, the mixer circuitry for down converting the amplified RF signal into I and Q modulated signals; low pass filter circuitry coupled to receive the I and Q modulated signals to produced I and Q modulated low pass filtered signals; an analog peak amplitude detection circuit coupled to receive the I and Q modulated low pass filtered signals, the analog peak amplitude detection circuit further comprising: log circuitry for producing an output characterized by the log(x), the log circuitry coupled to receive the I and Q modulated channels and for producing log(I) and log(Q) modulated channel signals; dual input nodes coupled to receive the log(I) and log(Q) modulated channel signals from the log circuitry, one at each input of the dual input nodes; and a voltage follower configuration wherein an output signal of the analog peak amplitude detection circuit is a function of the sum of the log(I) and log(Q) modulated channel signals; and gain control circuitry coupled to receive the output signal and to produce therefrom the control commands.