Patent ID: 7545856

Claim:
An integrated circuit radio transceiver, comprising: a baseband processor operable to process ingoing digital communication signals and to produce outgoing digital communication signals; a transmitter front end operable to process and transmit outgoing RF signals based upon the outgoing digital communication signals; and a receiver front end operable to produce the ingoing digital communication signals to the baseband processor based on ingoing RF signals; a phase shifter that produces a phase shifted input signal; a high impedance load coupled to an output of the phase shifter; a low impedance current mixing and amplification stage for generating an amplified frequency shifted output signal to at least a portion of one of the transmitter and receiver front ends, the current mixing and amplification stage further including: a current mixer operable to produce a frequency shifted output current signal based upon an oscillation and the phase shifted input signal received from the phase shifter, the current mixer characterized by an output impedance; an amplifier block operably disposed to produce an amplified signal based upon the frequency shifted output current signal, the amplifier block further including an amplifier with at least one feedback resistor; wherein gain of the amplifier block is based substantially upon a product of a gain characteristic of the current mixer and a resistance value of the at least one feedback resistor; and wherein the at least one feedback resistor is coupled directly to an input of the amplifier and to a mixer output of the current mixer.