Title :
Efficient and Linear Amplification of Spectrally Confined Pulsed AM Radar Signals
Author :
Michael Roberg;Miguel Rodriguez;Dragan Maksimovic;Zoya Popovic
Author_Institution :
Department of Electrical, Computer and Energy Engineering, University of Colorado, Boulder, CO, USA
Abstract :
This letter presents a pulsed high-efficiency power amplifier with increased spectral purity obtained by supply modulation of the pulse envelope. The PA operates at 2.14 GHz with 78% efficiency at 6 W peak power, and with 66.4% average efficiency over a 14.7 μs pulse with a 4.1 dB PAR shaped by a 90% efficient resonant-pulse envelope supply modulator. For PARs greater than 4.1 dB, the signal envelope can be split between the supply modulator and the PA drive, with up to 25% improvement in composite efficiency.
Keywords :
"Voltage measurement","Radar","Peak to average power ratio","Pulse shaping methods","Power measurement","RLC circuits","Transmitters"
Journal_Title :
IEEE Microwave and Wireless Components Letters
DOI :
10.1109/LMWC.2012.2197381
