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Frequency-agile class-D power amplifier

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2 Author(s)
Raab, F.H. ; Green Mountain Radio Res. Co., USA ; Ruppe, D.

The electronically tuned class-D power amplifier (PA) addresses the simultaneous needs for efficiency and frequency agility. The PA is based upon broadband transformer-coupled topology and uses a MOSFET operating in class D to deliver the maximum output power for given ratings. The output filter is a T network that provides a high impedance to and attenuation of the harmonics. The components of the output filter are bias-tuned inductors of a proprietary design and a voltage-variable capacitor implemented from a bank of high-voltage MOSFETs. The use of electronically tuned components allows the PA to be tuned and operated efficiently over a wide range of frequencies without band-switching.

Published in:

HF Radio Systems and Techniques, 2003. Ninth International Conference on (Conf. Publ. No. 493)

Date of Conference:

23-26 June 2003

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