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Basic considerations and topologies of switched-mode assisted linear power amplifiers

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3 Author(s)
Ertl, H. ; Power Electronics Section, Tech. Univ. Wien, Austria ; Kolar, J.W. ; Zach, F.C.

The paper presents a combined power amplifier system consisting of a linear amplifier unit with a switched-mode (class D) current dumping stage arranged in parallel. With this topology, the fundamental drawback of conventional linear power amplifiers-the high loss-is avoided. Compared to a pure class D (switching) amplifier, the presented system needs no output filter to reduce the switching frequency harmonics. This filter (usually of multi-stage type) generally deteriorates the transient response of the system and impairs the feedback loop design. Furthermore, the low-frequency distortions of switching amplifiers caused by the interlock delay of their power transistors are avoided with the presented switched-mode assisted linear amplifier system. This can be considered as a master-slave system with a guiding linear amplifier and a supporting class D slave unit. The paper describes the operating principle of the system, analyzes the fundamental relationships for the circuit design and presents simulation results. Finally, various further topologies of switched-mode assisted linear amplifiers are given

Published in:

Applied Power Electronics Conference and Exposition, 1996. APEC '96. Conference Proceedings 1996., Eleventh Annual  (Volume:1 )

Date of Conference:

3-7 Mar 1996