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What is hifi audio amplifier?

Linear amplifier

Operational amplifier

Direct-coupled amplifier

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Journal Article•DOI Design and test of a 434 MHz multi-channel amplifier system for targeted hyperthermia applicators J F Bakker, Margarethus M. Paulides, A. H. Westra, H. Schippers, G. C. Van Rhoon - Show less +4 more 10 Feb 2010-International Journal of Hyperthermia 35 Citations	The amplifier system operates according to our design criteria to support targeted HT.
Proceedings Article•DOI A new extension of one-cycle control and its application to switching power amplifiers Zheren Lai, Keyue Smedley - Show less +1 more 05 Mar 1995 44 Citations	This new extension is suitable for high efficiency, small volume, and low distortion audio power amplification.<<ETX>>
Journal Article•DOI A 70–80-GHz SiGe Amplifier With Peak Output Power of 27.3 dBm Hsin-Chang Lin, Gabriel M. Rebeiz - Show less +1 more 13 Jun 2016-IEEE Transactions on Microwave Theory and Techniques 41 Citations	To the best of our knowledge, this is the highest power silicon-based E-band amplifier to date.
Proceedings Article•DOI A 0.1 - 50 GHz SiGe HBT distributed amplifier employing constant-k m-derived sections J. Aguirre, Calvin Plett - Show less +1 more 08 Jun 2003 8 Citations	This amplifier is suitable for use in communication systems.
Journal Article•DOI Application of modified Ebers-Moll model to nonlinear distortion analysis of transistor amplifiers Hakan Kuntman 17 Feb 1983-Electronics Letters 9 Citations	Therefore the model can be used in design of low-distortion audio amplifiers.
Journal Article•DOI A novel bi-directional amplifier with applications in active Van Atta retrodirective arrays Shyh-Jong Chung, Shing-Ming Chen, Yang-Chang Lee - Show less +2 more 19 Feb 2003-IEEE Transactions on Microwave Theory and Techniques 88 Citations	This verifies the performance of the bi-directional amplifier.
Journal Article•DOI Improved charge amplifier using hybrid hysteresis compensation. Darya Amin-Shahidi, David L. Trumper - Show less +1 more 19 Aug 2013-Review of Scientific Instruments 10 Citations	Experimental results demonstrate the utility of the new amplifier design.
Journal Article•DOI Transmission characteristics of acoustic amplifier in thermoacoustic engine Daming Sun, Limin Qiu, Bo Wang, Yong Xiao - Show less +3 more 01 May 2008-Energy Conversion and Management 11 Citations	This research is instructive for comprehensively understanding the mechanism and making full use of the acoustic amplifier.

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