Direct-conversion tuner integrated circuit for direct broadcast satellite television

A tuner and data recovery system comprising:

• a digital signal processor;
• and
• an integrated circuit coupled to the digital signal processor, the integrated circuit including
• a variable gain amplifier (VGA) including (i) an amplifier input to receive a direct broadcast satellite signal, and (ii) a gain control input to receive a gain control signal, the variable gain amplifier providing as a VGA output being the input signal amplified by the gain control signal;
• a frequency synthesizer to regulate an oscillator signal to a desired frequency;
• a quadrature generator coupled to the variable gain amplifier and the frequency synthesizer, the quadrature generator to receive the oscillator signal and to generate inphase and quadrature components thereof;
• and
• a plurality of mixers coupled to the quadrature generator, the plurality of mixers to mix the VGA output with the inphase and quadrature components from the quadrature generator to provide inphase and quadrature components of the VGA output.

Adapted for direct broadcast satellite applications, a tuner comprising:

• a tank circuit;
• and
• an integrated circuit coupled to the tank circuit, the integrated circuit including
• a voltage controlled oscillator to provide an oscillator signal;
• a variable gain amplifier including (i) an amplifier input to receive a direct broadcast satellite signal, and (ii) a gain control input to receive a gain control signal, the variable gain amplifier providing, as a VGA output, the input signal amplified by the gain control signal;
• a frequency synthesizer to control the tank circuit in order to readjust the oscillator signal to a desired frequency;
• a quadrature generator coupled to the VGA and the frequency synthesizer, the quadrature generator to receive the oscillator signal and to generate inphase and quadrature components thereof;
• and
• a plurality of mixers coupled to the quadrature generator, the plurality of mixers to mix the VGA output with the inphase and quadrature components from the quadrature generator to provide inphase and quadrature components of the VGA output.