Patent ID: 7450185

Claim:
A television tuner system, comprising: a low noise amplifier (LNA) for receiving and amplifying television signals; an up-conversion quadrature mixer coupled to receive the amplified television signals and generate first intermediate frequency (IF 1 ) quadrature signals; a complex mixer coupled to receive the IF 1 quadrature signals and generate second intermediate frequency (IF 2 ) quadrature signals; a polyphase filter coupled to receive the IF 2 quadrature signals and generate IF 2 real signals; a channel select filter (CSF) coupled to receive the IF 2 real signals and select signals within a desired channel; an IF variable-gain amplifier (VGA) for amplifying the signals within the desired channel selected by the CSF; and a first local oscillator for providing first quadrature local oscillation (LO) signals, wherein: the up-conversion quadrature mixer is connectable to the first local oscillator for receiving the first quadrature LO signals and for mixing the amplified television signals with the first quadrature LO signals to generate the IF 1 quadrature signals; and the first intermediate frequency IF 1 is higher than a frequency of the television signals.