Patent ID: 6522367
Filing Date: 2003-02-18
Classification: H03G

Abstract:
A cable television (CATV) tuner apparatus having an input terminal for receiving an input signal and an output terminal for producing an intermediate frequency, the CATV tuner apparatus comprising:a first low-noise amplifier which amplifies a level of the input signal received at the input terminal, the first low-noise amplifier having a noise figure that does not add substantial noise to the received input signal passing through the first low-noise amplifier to allow the received input signal to be amplified with no substantial degradation of a carrier-to-noise ratio of the received input signal; an automatic gain control which detects the level of the signal amplified by the first low-noise amplifier and adjusts an amplitude of the of the signal; a band-pass filter which eliminates out-of-band noise components from the signal received from the automatic gain control and passes only in-band signal components through the band-pass filter; a second low-noise amplifier which amplifies a level of the signal received from the band-pass filter; and a frequency synthesizer which produces the intermediate frequency signal at the output terminal through a multiplication of a frequency of the signal, amplified by the second low-noise amplifier, by an oscillation frequency.