Patent ID: 7539476

Claim:
Radio frequency (RF) receiver circuitry configured for receiving an RF signal and down-converting said RF signal to base band, said receiver circuitry comprising: (a) RF-to-IF conversion circuitry configured for RF-to-IF conversion of said RF signal to an IF signal, said RF-to-IF conversion circuitry comprising mixer circuitry for down-converting said RF signal to a band pass IF signal; local oscillator circuitry configured for injection locking and generating an RF-to-IF mixing signal for input to said mixer circuitry, said mixing signal having a frequency which is a first pre-selected harmonic of a reference frequency; and, tunable IF filter circuitry comprising an IF filter and configured for pre-tuning said IF filter to said band of said band pass IF signal and, when so tuned, for filtering said band pass IF signal; (b) IF-to-base band conversion circuitry configured for IF-to-base band conversion of said IF signal, said IF-to-base band conversion circuitry comprising sub-sampling and down-conversion circuitry operating at a sampling frequency of a sampling signal input thereto, said sampling frequency being a second pre-selected harmonic of said reference frequency; and, (c) reference frequency source circuitry configured for generating a reference signal of said reference frequency; wherein each of said mixing signal and said sampling signal is derived from said reference signal as a harmonic thereof.