Patent ID: 7519333

Claim:
A frequency division duplexed (FDD) radio, comprising: a duplexer; a transmitter section coupled to the duplexer, the transmitter section transmitting in a transmit frequency band having a center frequency; a receiver section coupled to the transmitter section, for receiving a signal at a receive frequency that is different from the transmit band center frequency, the receiver section including a down conversion section comprising first and second mixers, said first and second mixers receiving a local oscillator (LO) signal having a frequency equal to the transmit band center frequency or a sub-harmonic thereof; a first high pass filter having an input coupled to the output of the first mixer, and having an output; a second high pass filter having an input coupled to the output of the second mixer, and having an output; a first set of two mixers coupled to the output of the first high pass filter; and a second set of two mixers coupled to the output of the second high pass filter.