Patent ID: 7764942

Claim:
A frequency-dependent impedance generator suitable for use in a radio frequency (RF) tuner, the frequency-dependent impedance generator comprising: a) a first I/Q mixer, the first I/Q mixer mixing input RF signals with a first local oscillator signal; b) a plurality of fixed-frequency filters, the plurality of fixed-frequency filters filtering the I/Q paths generated by the first I/Q mixer; c) a second I/Q mixer, the second I/Q mixer mixing the filtered I/Q paths with the first local oscillator signal; d) a summation module, the summation module summing the I/Q paths generated by the second I/Q mixer to generate a baseband signal; and e) a transconductance amplifier, the transconductance amplifier shunt feeding back the baseband signal to the first I/Q mixer to generate the frequency-dependent impedance.