Patent ID: 8314653
Filing Date: 2012-11-20
Classification: H03F,H03H,H04B

Abstract:
1. Radio frequency (RF) front end circuitry comprising: a first active tunable low-noise RF bandpass filter adapted to receive, amplify, and filter a first RF input signal and comprising: control circuitry adapted to provide the first degeneration tuning signal, wherein at the first center frequency, the first active tunable low-noise RF bandpass filter has a first gain, and at the first frequency outside of the first passband, the first active tunable low-noise RF bandpass filter has a second gain, which is less than the first gain; and further comprising a first antenna tuning circuit coupled between the first active tunable low-noise RF bandpass filter and a first RF switch, such that, during operation of the first active tunable low-noise RF bandpass filter: the control circuitry is further adapted to provide a first antenna match tuning signal; and the first antenna tuning circuit is adapted to provide at least an approximate impedance match to the first RF switch at the first center frequency based on the first antenna match tuning signal.