Patent ID: 8483625

Claim:
An RF transceiver apparatus comprising transmitter circuitry arranged to convert signals from a baseband frequency to a range of RF transmission frequencies and receiver circuitry arranged to convert signals from a range of RF reception frequencies to the baseband frequency wherein: the transmitter circuitry comprises a first transmitter mixer arranged to convert a signal from the baseband frequency to a first intermediate frequency; a second transmitter mixer arranged to convert the signal from the first intermediate frequency to a second intermediate frequency that is higher than the transmission frequencies; and a third transmitter mixer arranged to convert the signal from the second intermediate frequency to the transmission frequency; and the receiver circuitry comprises a third receiver mixer arranged to convert the RF input from the reception frequency to the second intermediate frequency which is higher than the reception frequency, a second receiver mixer arranged to convert the signal from the second intermediate frequency to a first intermediate frequency which is lower than the reception frequency, and a first receiver mixer arranged to convert the signal from the first intermediate frequency to the baseband frequency; and the second receiver mixer and the second transmitter mixer are both driven by a common second stage fixed frequency synthesizer.