Patent ID: 8736395
Filing Date: 2014-05-27
Classification: H03C

Abstract:
1. A wireless communication apparatus comprising: an IQ modulation circuit configured and arranged to generate IQ modulation components, including an in-phase (I) component and a quadrature-phase component (Q), of an input signal, and convert the in-phase component and the quadrature-phase component to a phase modulation component; differential power amplifier circuitry configured and arranged to generate an amplified polar modulated output signal in accordance with the phase modulation component and an amplitude modulation component of the input signal for processing in separate paths; amplifying circuitry configured and arranged to amplify the phase modulation component and, in response, to provide an amplified phase modulation component to a differential input of the differential power amplifier circuitry; bias control circuitry configured and arranged to control a bias input of the differential power amplifier circuitry based on the amplitude modulation component, and therefrom providing a signal for modulating a common-mode current of the differential power amplifier circuit.