Abstract: A raido-frequency (RF) power amplifier includes an active device, having an input port, which is coupled to receive an RF input signal having a center frequency f0 and a single-sided bandwidth BW, and an output port, which is characterzed by an output capacitance C1 and is coupled to output an amplified RF signal, responsive to the input signal, with a peak output power Pout. A distortion suppression circuit is coupled between the output port and a ground, and includes a transmission line having a characteristic impedance Z0 that is selected so as to substantially satisfy a condition that Z 0 ≤ f 0 π ⁢   ⁢ BW · 1 P out 11.

Abstract: A method for processing an input signal having an input peak-to-average (PAR) so as to generate an output signal having an output PAR and a permitted spectral mask. The method includes generating a difference signal proportional to an amount by which the input signal exceeds a predetermined threshold, and filtering the difference signal with a filter having a spectral response that is determined responsively to the permitted spectral mask. The filtered difference signal is subtracted from the input signal to generate the output signal so that the output PAR is adjusted relative to the input PAR. Typically, the output PAR is reduced relative to the input PAR.

Abstract: A super-linear feedforward amplifier, for amplifying radio-frequency input signals produced in one or more frequency channels over an input band, includes a radio-frequency power amplifier, which amplifies the signals. A signal cancellation circuit loop generates an error signal responsive to distortion products in the amplified signals. A digital correction block digitally equalizes the input signals responsive to a transfer function of the amplifier, whereby the input signals are substantially canceled out of the error signal over the entire input band. An error cancellation circuit loop subtracts the error signal from the amplified signals to generate a linearized output signal.