Patent ID: 6714261
Filing Date: 2004-03-30
Classification: H03G,H03J,H04N

Abstract:
A CATV tuner comprising:an upstream circuit for transmitting a data signal to a CATV (cable television) station, a high pass filter for receiving a multiwave down signal from said CATV station while removing said data signal, and a receiving unit for receiving the down signal provided through said high pass filter, wherein said receiving unit includes a gain control circuit receiving said down signal, attenuating the down signal with a prescribed gain and thereafter amplifying the down signal and outputting a resulting signal, a high frequency amplifying circuit receiving the output signal from said gain control circuit and extracting signals having frequencies of different ranges dependent on different frequency bands, a frequency converting circuit converting each of the signals from said high frequency amplifying circuit to a prescribed intermediate frequency signal of respective ranges, and an intermediate frequency amplifying circuit amplifying the output signals from said frequency converting circuit and providing an amplified output, wherein said high frequency amplifying circuit includes input selecting circuits for receiving an output signal from said gain control circuit and selectively providing outputs of a plurality of ranges dependent on frequency band, high frequency amplification input tuning circuits, corresponding to said plurality of ranges respectively, for tuning the signal of each range selected by said input selecting circuits to a desired frequency, and outputting resulting signals, a high frequency amplifying circuit provided commonly to said plurality of ranges, amplifying respective output signals from said high frequency amplification input tuning circuits and providing an amplified output, output selecting circuits receiving the output signal from said high frequency amplifying circuit and selectively providing outputs to said plurality of ranges, and high frequency amplification output tuning circuits provided corresponding to said plurality of ranges respectively, receiving the signals of respective ranges selectively output from said output selecting circuits, tuning the signals to desired frequencies, and providing an output.