Broad-band distributed amplifier impedance-matching techniques

Author

Cioffi, Kenneth R.

Author_Institution

Rockwell Int. Corp., Anaheim, CA, USA

Volume

37

Issue

12

fYear

1989

fDate

12/1/1989 12:00:00 AM

Firstpage

1870

Lastpage

1876

Abstract

A circuit concept is developed which allows impedance transformations to be performed over extremely broad bandwidths. The transformation is obtained by coupling one or more input or output lines of a distributed amplifier into several output or input lines, respectively. The circuit technique is demonstrated by results for an amplifier for a 1:2 impedance transformation over a 2-20-GHz bandwidth. The amplifier yields a voltage standing wave ratio (VSWR) of better than 1.7:1 into 25 Ω at the input and better than 1.5:1 into 50 Ω at the output while maintaining a gain of 9±1 dB. An application of the technique to the broadband impedance-matching problem of a laser diode driver is discussed. The circuit has a gain of 8.5±1 dB from 0.5 to 12.5 GHz and better than 10 dB return loss at both the input and output

Keywords

impedance matching; microwave amplifiers; wideband amplifiers; 0.5 to 12.5 GHz; 2 to 20 GHz; 8 to 10 dB; broad bandwidths; circuit technique; distributed amplifier; gain; impedance transformation; impedance transformations; laser diode driver; output lines; voltage standing wave ratio; Bandwidth; Capacitance; Diode lasers; Distributed amplifiers; Distributed parameter circuits; Impedance; Inductance; Microwave circuits; Power transmission lines; Transmission line theory;

fLanguage

English

Journal_Title

Microwave Theory and Techniques, IEEE Transactions on

Publisher

ieee

ISSN

0018-9480

Type

jour

DOI

10.1109/22.44096

Filename

44096