Improved resonance suppression for envelope tracking modulators

摘要

An envelope tracking power supply configured to generate a supply voltage that is modulated in response to a reference signal, the first path for tracking low frequency fluctuations in the reference signal, and high frequency fluctuations in the reference signal. A coupling for generating a modulated power supply voltage, comprising a second path for tracking and having a low frequency coupling element for the first path and a high frequency coupling element for the second path A sensing circuit for sensing a resonant signal in the low or high frequency coupling element, and an adjusting circuit for adjusting the signal in the first path in response to the sensed resonant signal, Envelope tracking power supply.