Patent ID: 8139159

Claim:
A television tuner for frequency-translating a television signal, comprising: a low pass filter for extracting a first-band signal from the television signal; a high pass filter disposed in parallel to the low pass filter for extracting a second-band signal from the television signal; a local oscillator generating a reference signal having a frequency tunable depending on a desired channel; a harmonic rejection and quadrature mixer coupled to the low pass filter for mixing the first-band signal with the reference signal to output a first pair of in-phase and quadrature-phase signals while eliminating a harmonic-frequency component from the first pair of in-phase and quadrature-phase signals; a quadrature mixer coupled to the high pass filter for mixing the second-band signal with the reference signal to output a second pair of in-phase and quadrature-phase signals; and a digital signal processing circuit coupled to both the harmonic rejection and quadrature mixer and the quadrature mixer for selectively mixing either the first pair of in-phase and quadrature-phase signals or the second pair of in-phase and quadrature-phase signals to generate an output signal corresponding to the desired channel.