ENVELOPE DETECTOR, CLASS-AB RADIO FREQUENCY AMPLIFIER FOR ENVELOPE DETECTOR AND FEEDBACK CIRCUIT OF CLASS-AB RADIO FREQUENCY AMPLIFIER FOR ENVELOPE DETECTOR

摘要

An envelope detector (ED) is a radio frequency (RF) voltage comprising a sense transistor for sensing the voltage envelope of the signal-input mode includes the ED core, RF signal input comprises the output of the radio, such as a cellular transmitter (TX) do. The ED further includes a position in between the TX gain stage output and ED cores in series a plurality of voltage amplifier to provide the total linear voltage range of the envelope detector. And a plurality of voltage amplifiers end of the voltage amplifier comprises a class -AB RF amplifier configured to drive the core and ED and ED to the linear voltage range of operation in the linear voltage range of the whole of the core. ;