Amplifier with variable feedback impedance

摘要

A variable feedback impedance is presented capable of providing high linearity (e.g. as represented by IP2 and IP3) and high linear range (e.g. as represented by P1dB) when used in a feedback path of an RF amplifier in the presence of high voltage amplitudes.

主权项

1. A radio frequency (RF) amplifier arrangement comprising:
an RF amplifier; an input terminal of the RF amplifier arrangement connected to an input of the RF amplifier; an output terminal of the RF amplifier arrangement connected to an output of the RF amplifier; a feedback path connected between the output terminal and the input terminal, the feedback path comprising:
i) a selectable impedance network comprising:
one or more resistive and/or reactive components; andone or more stacked transistor switches operatively coupled to the one or more resistive and/or reactive components; andii) a capacitor in series connection with the selectable impedance network, wherein:
the one or more stacked transistor switches are configured to select an impedance value of the selectable impedance network from a plurality of selectable impedance values in correspondence of a desired impedance value of the feedback path.