Patent ID: 7228119
Filing Date: 2007-06-05
Classification: H04B

Abstract:
1. An amplifier stage used in a radio receiver comprising: at least one tunable preselector for accepting a radio frequency (RF) input signal within a passband of the receiver; at least one low noise amplifier (LNA) for amplifying the RF input signal; and wherein the at least one tunable preselector is selectively tuned with a control voltage to be offset such that the at least one tunable preselector acts as an attenuator providing substantially equal attenuation within the at least one tunable preselector's passband, to a plurality of input signals comprised of both desired, on-channel signals and off-channel signal interferers, sufficient to reduce on-channel intermodulation distortion created by off-channel interferers; wherein the at least one preselector includes a first preselector used at the input of the at least one LNA and a second preselector is used at the output of the at least one LNA; wherein the first preselector and second preselector are tuned through a digital-to-analog converter (DAC) with the same control voltage.