A radio frequency (RF) tuner includes a programmable tracking filter bank
receiving an RF input and outputting a filtered RF signal. A mixer stage
receives the filtered RF signal and outputs a first quadrature component
of the filtered RF signal and a second quadrature component of the
filtered RF signal. Two variable gain amplifiers receive the first and
second quadrature components and output amplitude-controlled I and Q
components of the filtered RF signal. In one embodiment, the programmable
tracking filter bank includes a plurality of tank circuits each connected
to the RF input through an impedance. Each tank circuit include an
inductor and a capacitor connected in parallel thereby forming an LC
network, and a plurality of switched capacitors in parallel with the LC
network and switched in and out of the tank circuit by programmable
switches. In another embodiment, the programmable tracking filter bank
includes a plurality of peaked low-pass circuits each connected to the RF
input through an impedance. Each peaked low-pass circuit includes a
capacitor connected to ground, and a plurality of switched capacitors in
parallel with the capacitor and switched in and out of the peaked
low-pass circuit by programmable switches.