Patent ID: 6950478

Claim:
A transmitter for transmitting a transmit signal having a transmit frequency within a transmit frequency band, comprising: a high-low signal generator for generating an LO signal having an LO frequency lower than said transmit frequency band when said transmit frequency is in a lower part of said transmit frequency band and an LO frequency greater than said transmit frequency when said transmit frequency is in an upper part of said transmit frequency band; an upconverter for using said LO signal for frequency upconverting an intermediate frequency (IF) signal to said transmit signal; and a digital to analog converter (DAC) using a sampling clock signal having a sampling clock frequency for converting a digital signal to said IF signal, said IF signal having an IF frequency band having IF channel frequencies corresponding to transmit channel frequencies in said lower part of said transmit frequency band and having the same said IF channel frequencies corresponding to different transmit channel frequencies in said upper part of said transmit frequency band; wherein: said sampling frequency is about equal to a sum of a fraction of the width of said transmit frequency band plus a lower IF frequency times a sum of one plus a ratio of an alias frequency to an upper IF frequency, said lower IF frequency and said upper IF frequency bounding said IF frequency band and said alias frequency at said sampling clock frequency minus said upper IF frequency.