Patent ID: 7272365

Claim:
In a multi-channel transmitter having a specified channel spacing, a method comprising: generating a first mixing signal; upconverting a baseband signal to an intermediate frequency (IF) by mixing the baseband signal using the first mixing signal; generating a second mixing signal using a reference signal whose frequency is a non-integer multiple of the channel spacing for the transmitter; and upconverting the IF signal to generate an outgoing signal having an outgoing frequency by mixing the IF signal using the second mixing signal whose frequency differs from an ideal mixing frequency for the outgoing signal as a result of the frequency of the reference signal being the non-integer multiple of the channel spacing for the transmitter, wherein: the frequency of the first mixing signal is selected based on a frequency difference between the frequency of the second mixing signal and the ideal mixing frequency, such that, the first mixing signal pre-compensates for the frequency difference between the second mixing signal frequency and the ideal mixing frequency.