Patent ID: 6839551

Claim:
A radio frequency (RF) demodulation circuit comprising: a first RF mixer having a first input port capable of receiving an in-phase RF signal having a frequency of RF and a second input port capable of receiving an in-phase local oscillator (LO) signal having a frequency of LO, wherein LO is approximately equal to one-half of RF, and wherein said first RF mixer generates a first intermediate frequency (IF) signal having a frequency of LO; a second RF mixer having a first input port capable of receiving an out-of-phase RF signal having a frequency of RF and a second input port capable of receiving an out-of-phase local oscillator (LO) signal having a frequency of LO, and wherein said second RF mixer generates a second intermediate frequency (IF) signal having a frequency of LO; and a first signal combiner capable of combining said first and second IF signals to generate a composite IF signal, wherein said first signal combiner combines a first leakage signal from said first RF mixer and a second leakage signal from said second RF mixer such that said first and second leakage signals at least partially cancel each other to produce an output leakage signal that is less than either of said first and second leakage signals.