US 12,587,138 B2 · Asymmetrical power amplifier circuit

Abstract

An asymmetrical power amplifier circuit is provided. The asymmetrical power amplifier circuit includes a carrier amplifier and a peak amplifier. The carrier amplifier is always active to amplify a radio frequency (RF) to a carrier output power, while the peak amplifier is only active to amplify the RF signal to a peak output power when a time-variant output power of the RF signal is higher than a predefined power threshold. The RF signal in the carrier output power is summed with the RF signal in the peak output power to thereby output the amplified RF signal in the time-variant output power. Unlike a conventional symmetrical power amplifier, the carrier output power and the peak output power are different at a peak of the time-variant output power. As such, the carrier amplifier and the peak amplifier can both operate with optimal efficiency based on a same modulated voltage.

Claims20

Dependent claims

An asymmetrical power amplifier circuit comprising:

a signal input configured to receive a radio frequency (RF) signal in a time-variant input power;
a signal output configured to output the RF signal in a time-variant output power that equals a sum of a carrier output power and a peak output power;
a carrier amplifier configured to amplify the RF signal from the time-variant input power to the carrier output power based on a modulated voltage;
a peak amplifier configured to amplify the RF signal from the time-variant input power to the peak output power based on the modulated voltage;
and
an impedance control circuit coupled to the carrier amplifier and the peak amplifier and configured to cause the carrier output power to be different from the peak output power at a peak of the time-variant output power of the RF signal.

3 more elements

Dependencies are inferred from the claim text.

Asymmetrical power amplifier circuit

Life of this patent

Asymmetrical power amplifier circuit

Life of this patent

Abstract

Claims20