Patent ID: 8314653

Claim:
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: at least a first transistor element adapted to receive the first RF input signal; and a tunable frequency selective degeneration circuit coupled to a first non-inverting output of the first transistor element, such that during operation of the first active tunable low-noise RF bandpass filter: the first active tunable low-noise RF bandpass filter has a first passband; a first center frequency of the first passband is based on a first degeneration tuning signal; at the first center frequency, the tunable frequency selective degeneration circuit presents a first impedance to the first non-inverting output based on the first degeneration tuning signal; at a first frequency outside of the first passband, the tunable frequency selective degeneration circuit presents a second impedance to the first non-inverting output based on the first degeneration tuning signal; and the second impedance is greater than the first impedance; and 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.