Patent ID: 8150351

Claim:
A tuner front end ( 170 ) for use with a tuner for tuning a channel from an RF input signal, with calibration to eliminate the need for manual adjustment of the tuner front end, comprising: a) a multi-mode low noise amplifier that is switchable between a low noise mode and a high linearity mode for amplifying the RF input signal; b) a first stage tracking filter ( 140 ) for filtering the amplified RF input signal comprising an inductor and variable capacitors for setting the filter frequency; c) an amplifier ( 142 ) coupled to the first stage tracking filter ( 140 ) and producing an amplified signal; and d) a test tone generator and tracking filter calibration circuit ( 183 ) to apply a calibration signal to the tuner front end and adjust the variable capacitors of the first stage tracking filter ( 140 ) to calibrate the response of the first stage tracking filter.