Television tuner to capture a cable spectrum

摘要

A method includes receiving a request to tune to a first desired television channel of a cable spectrum provided in a radio frequency (RF) signal received in a multi-tuner circuit configured to receive and process the entire cable spectrum, determining a channel of the channels including the first desired television channel, disabling the channels other than the determined channel, and processing the RF signal in the determined channel.

主权项

1. An apparatus comprising:
a splitter to receive a radio frequency (RF) signal that provides a cable spectrum and to provide the RF signal to a plurality of channels each to process a band of a predetermined width of the cable spectrum, wherein each of the plurality of channels comprises:
a first amplifier to amplify the RF signal;a bandpass filter fixed at a predetermined center frequency to pass the band of the predetermined width of the cable spectrum;a mixer to downconvert the amplified RF signal to a second frequency signal using a local oscillator (LO) signal, each of the plurality of channels configured to receive a different LO signal;a second filter to filter the second frequency signal; anda digitizer to digitize the filtered second frequency signal; and a clock generation circuit including a frequency synthesizer to generate a reference clock signal, a plurality of first dividers and a plurality of interpolative dividers, each of the plurality of first dividers to generate a corresponding LO signal from the reference clock signal according to an integer ratio and to provide the corresponding LO signal to the mixer of at least one of the plurality of channels, the plurality of interpolative dividers to generate a corresponding LO signal from the reference clock signal according to a fractional ratio and to provide the corresponding LO signal to the mixer of at least one of the plurality of channels.