SINGLE-CHIP DIGITAL CABLE TV/CABLE MODEM TUNER IC

摘要

A television receiver (200) includes first mixer (208) having first input for inputting signal. The first mixer (208) further includes a second input for receiving a first reference signal having a first operating frequency. The first mixer (208) outputs an intermediate frequency signal having a frequency greater than at least one frequency in the predetermined frequency range of input signal. A filter (210) filters the intermediate frequency signal. A phase shifting network (212) includes an input for receiving a second operating frequency reference signal, and a pair of outputs for outputting a pair of quadrature frequency reference signals which substantially equal to the second operating frequency. A pair of second mixers (214) each have first input coupled to the filter and second input coupled to the outputs of the phase shifting network. The second mixer (214) generate output signals that are in quadrature and at a baseband frequency where is coupled to a pair of low-pass filters (254).