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Efficient and Linear Amplification of Spectrally Confined Pulsed AM Radar Signals

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4 Author(s)
Roberg, Michael ; Dept. of Electr., Comput. & Energy Eng., Univ. of Colorado, Boulder, CO, USA ; Rodriguez, M. ; Maksimovic, D. ; Popovic, Z.

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.

Published in:

Microwave and Wireless Components Letters, IEEE  (Volume:22 ,  Issue: 6 )