| 主权项 |
1. A digital wireless transmitter, comprising:
a digital system-on-a-chip configured to receive a complex digital input signal and including:
an all-digital phase-locked loop and digital pulse modulator configured to modulate a phase and frequency modulation signal based on said complex digital input signal to yield a modulated complex signal,a driver configured to generate a pulse-position-modulated and pulse-width-modulated pulse train based on an instantaneous phase and amplitude of said modulated complex signal, anda power supply modulation control circuitry configured to develop an amplitude modulation control signal that defines a non-constant envelope for an output signal of said transmitter based on said complex digital input signal, said all-digital phase-locked loop and digital pulse modulator and said power supply modulation control circuitry respectively providing separate pulse-width modulation and power supply modulation functions that combine to yield a desired envelope for said output signal; and a high-power module including:
a power amplifier configured to amplify said pulse-position-modulated and pulse-width-modulated pulse train to provide said output signal, anda regulator coupled to said power amplifier and to said power supply modulation control circuitry and configured to apply said non-constant-envelope to said output signal. |
