Patent ID: 8768283

Claim:
A complex intermediate frequency (CIF) mixer stage for converting intermediate frequency (IF) signals to baseband frequency signals, the IF signals comprising a first phase signal and a second phase signal, the baseband frequency signals comprising a lower side band signal and an upper side band signal, the CIF mixer stage comprising: a first branch for receiving the first phase signal and comprising: a first mixer configured to be driven by a first IF clock signal to convert the first phase signal to a first output signal; a second mixer configured to be driven by a second IF clock signal to convert the first phase signal to a second output signal; a third mixer configured to be driven by a third IF clock signal to convert the first phase signal to a third output signal; a second branch for receiving the second phase signal and comprising: a fourth mixer configured to be driven by the second IF clock signal to convert the second phase signal to a fourth output signal; a fifth mixer configured to be driven by the third IF clock signal to convert the second phase signal to a fifth output signal; a sixth mixer configured to be driven by the first IF clock signal to convert the second phase signal to a sixth output signal; a first adder for combining the fourth and third output signals to form a first phase portion of the lower side band signal; a second adder for combining the second and sixth output signals to form a second phase portion of the lower side band signal; a third adder for combining the fourth and first output signals to form a first phase portion of the upper side band signal; a fourth adder for combining the second and fifth output signals to form a second phase portion of the upper side band signal; wherein the first, second, and third IF clock signals have a predefined phase relationship with respect to each other.