Patent ID: 7509104

Claim:
A method of tuning an RF (radio frequency) signal, comprising: generating a first IF (intermediate frequency) signal by mixing the RF signal with a first local oscillator signal when the RF signal is within a first frequency band; generating a second IF signal by mixing the RF signal with the first local oscillator signal when the RF signal is within a second frequency band different from the first frequency band; varying the frequency of the first local oscillator signal depending on the frequency of the RF signal; increasing the frequency of the first local oscillator signal with an increase in frequency of the RF signal in the first frequency band; and decreasing the frequency of the first local oscillator signal with an increase in frequency of the RF signal in the second frequency band, wherein each of the first and second IF signals is further mixed with another respective local oscillator signal having a frequency that is not changed even as the frequency of the first local oscillator signal is increased with the frequency of the RF signal and that is not changed even as the frequency of the first local oscillator signal is decreased with the frequency of the RF signal.