Patent ID: 6031878
Filing Date: 2000-02-29
Classification: H03D,H04N

Abstract:
A tuner for direct broadcast satellite applications comprising:an integrated circuit having:a variable gain amplifier (VGA) having an amplifier input for coupling to a direct broadcast satellite signal receiving means, a VGA output and a VGA gain control input, the amplifier having a bandwidth for receiving on its input an input signal in a direct broadcast satellite signal frequency range and providing as the VGA output, the input signal amplified with a gain controlled by a gain control signal on the gain control input;a quadrature generator for receiving an oscillator signal of a frequency approximating the frequency of a carrier in a direct broadcast satellite signal frequency range and generating inphase and quadrature components thereof;first and second mixers for mixing the VGA output with the inphase and quadrature components from the quadrature generator to provide inphase and quadrature components of the VGA output; andlow pass active filters coupled to the inphase and the quadrature components of the output from the mixers; andwherein the low pass range of the active filters is adjustable.