Envelope detector and method for detecting an envelope of a signal to be amplified by a power amplifier

摘要

An envelope detector includes an input receiving a digital input signal indicative of a magnitude of a signal to be amplified by a power amplifier. A circuit is provided for generating an analog envelope signal based on the digital input signal. The envelope detector includes an output for outputting the analog envelope signal.

主权项

1. An envelope detector comprising:
an input configured to receive a digital input signal indicative of a magnitude of a digital signal to be amplified by a power amplifier, wherein the digital input signal is at least a portion of the digital signal to be amplified; a digital signal processing unit connected to the input and configured to process the digital input signal; a digital low-pass filter connected to the digital processing unit and configured to reduce a bandwidth of the processed digital input signal; a digital-to-analog converter (DAC) connected to the digital low-pass filter and configured to convert the low-pass filtered, processed digital input signal into an analog signal; an analog low-pass filter connected to the DAC and configured to low-pass filter the analog signal for attenuating high frequency noise; and an output connected to the analog low-pass filter and configured to output the low-pass filtered analog signal.