Apparatus and method for power management

摘要

An apparatus for power management for use in a mobile device includes an RF (Radio Frequency) circuit, a power amplifier, a processor, and a DC to DC (Direct Current to Direct Current) converter. The processor is configured to generate a baseband signal. The RF circuit is configured to generate an RF signal according to the baseband signal. The power amplifier is configured to amplify the RF signal according to a supply voltage so as to generate an output signal. The processor is configured to detect an envelope of the RF signal, and to generate a control signal according to the envelope of the RF signal. The DC to DC converter operates in an APT (Average Power Tracking) mode or an ET (Envelope Tracking) mode so as to generate the supply voltage.

主权项

1. An apparatus for power management for use in a mobile device, comprising:
a processor, generating a baseband signal; an RF (Radio Frequency) circuit, coupled to the processor, and generating an RF signal according to the baseband signal; a power amplifier, coupled to the RF circuit, and amplifying the RF signal according to a supply voltage so as to generate an output signal; and a DC to DC (Direct Current to Direct Current) converter, coupled between the processor and the power amplifier, and providing the supply voltage for the power amplifier, wherein: the processor is configured to detect an envelope of the RF signal, and to generate a control signal according to the envelope of the RF signal; the DC to DC converter operates in an APT (Average Power Tracking) mode or an ET (Envelope Tracking) mode according to the control signal so as to generate the supply voltage, wherein the processor is further configured to obtain output power of the output signal according to the envelope of the RF signal, and wherein if the output power is greater than a threshold value, the processor makes the DC to DC converter select the ET mode, and if the output power is less than or equal to the threshold value, the processor makes the DC to DC converter select the APT mode.