Improved high-voltage push-pull amplifier using DMOS power fets

Author

Theofanous, N.G. ; Tsitomeneas, S.T. ; Alexakis, G.E. ; Arapoyianni, A.T.

Author_Institution

University of Athens, Physics Department, Physical Electronics Laboratory, Athens, Greece

Volume

134

Issue

2

fYear

1987

fDate

4/1/1987 12:00:00 AM

Firstpage

67

Lastpage

82

Abstract

A bridge-type push-pull amplifier using a DMOS power FET pair, differentially driven by a dual operational amplifier phase splitter, to provide an AC high-voltage floating output is investigated, particularly for electro-optic or capacitive loads. The amplifier exploits the advantages of the above MOSFETs and uses an appropriate feedback circuitry and class A low-current biasing to improve its linearity, thermal stability, bandwidth capabilities, and some mismatch-effect features. A practical circuit implementation is also presented which gives up to 780 V peak-to-peak output with an overall voltage gain of 430 and a maximum gain-bandwidth product of about 2.9 GHz for the entire system. Testing results in general verify the majority of theoretical expectations.

Keywords

feedback; field effect transistor circuits; power amplifiers; power transistors; radiofrequency amplifiers; wideband amplifiers; 0.17 to 3.3 MHz; 2.9 GHz gain-bandwidth product; 430 voltage gain; 780 V; AC high-voltage floating output; DMOS power FETs; HV type; MOSFETs; bandwidth capabilities; bridge-type; capacitive loads; class A low-current biasing; differential output; dual operational amplifier phase splitter; electro-optic loads; feedback circuitry; mismatch-effect; peak-to-peak output; power amplifier; push-pull amplifier; thermal stability;

fLanguage

English

Journal_Title

Electronic Circuits and Systems, IEE Proceedings G

Publisher

iet

ISSN

0143-7089

Type

jour

DOI

10.1049/ip-g-1:19870010

Filename

4647027