Patent ID: 8515371
Filing Date: 2013-08-20
Classification: H03D,H04B,H04N

Abstract:
1. A tuner system for radio frequency (RF) reception comprising: a low noise amplifier for receiving an RF signal, the low noise amplifier configured to output an amplified RF signal, the amplified RF signal including a plurality of bands; a band selection filter having a plurality of inductors and configured to select one of the plurality of bands; a complex RF filter configured to generate a complex RF signal from the selected one of the plurality of bands for removing negative frequencies of the selected one of the plurality of bands; a double-quadrature down-converter configured to receive the complex RF signal and mix the complex RF signal with a first local oscillation frequency and a second local oscillation frequency and outputting a baseband in-phase signal and a baseband quadrature signal, the double-quadrature down-converter comprising four high frequency multipliers, each of the four multipliers including a first input coupled to the in-phase component or the quadrature component and a second input coupled to either the first local frequency or the second local frequency so that four multiplication products are obtained; a baseband filter having at least two substantially equal lowpass frequency responses to filter the baseband in-phase signal and the baseband quadrature signal; an up-converter configured to receive the filtered baseband in-phase and quadrature signals and frequency up-converting the filtered baseband in-phase and quadrature signals to an intermediate frequency IF-I signal and an IF-Q signal; and a filter coupled to the up-converter for receiving the frequency up-converted in-phase and quadrature signals and being configured to output an IF signal; wherein the first and second local oscillation frequencies are shifted by 90 degrees; wherein the IF-I and IF-Q signals have an IF center frequency and an IF bandwidth.