| 摘要 |
An envelope tracking amplification system (200) that includes an envelope tracking power supply (ETPS) (208) amplifies a radio frequency (RF) signal (201) to produce a linearized amplified signal (213). The envelope tracking amplification system samples the RF signal to produce a sampled RF signal (205). The ETPS (208) produces a control signal based on an instantaneous magnitude of the sampled RF signal and further based on an average magnitude of the sampled RF signal, produces multiple supply voltages, and, based on the control signal, couples a supply voltage of the multiple supply voltages to an output of the EPTS to produce an output supply voltage (211). The envelope tracking amplification system then amplifies the RF signal based on the output supply voltage to produce the highly linear amplified signal (213).
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