Title :
Operating Modes of Dynamic Power Supply Transmitter Amplifiers
Author_Institution :
RF Commun. Consulting, Santa Clara, CA, USA
Abstract :
Any amplifier operated with a varying supply voltage is actually a three-port circuit, having two inputs and one output. When an amplifier is characterized as a three-port for dynamic supply voltage operation, three separate operating modes appear: linear L-mode and the two nonlinear modes C-mode and P-mode. Each of these modes, along with their relationships and differences, are identified, characterized, and discussed. Relations of these modes to the dynamic power supply transmitter techniques of envelope tracking and/or direct polar are presented. Measurements are reported that provide experimental verification for these amplifier operating modes.
Keywords :
power amplifiers; power supply circuits; transmitters; C-mode; P-mode; direct polar; dynamic power supply transmitter amplifiers; dynamic power supply transmitter techniques; envelope tracking; linear L-mode; nonlinear modes; three-port circuit; varying supply voltage; Bipolar transistors; Power dissipation; Radio frequency; Resistance; Sensitivity; Transistors; Transmitters; Amplifier; compression; envelope tracking (ET); polar modulation; power amplifiers (PAs);
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
DOI :
10.1109/TMTT.2014.2360858
