A wide range analog MMIC attenuator with integral 180° phase shifter

Author

Goldfarb, Marc E. ; Platzker, Aryeh

Author_Institution

Res. Div., Raytheon Co., Lexington, MA, USA

Volume

42

Issue

1

fYear

1994

fDate

1/1/1994 12:00:00 AM

Firstpage

156

Lastpage

158

Abstract

A circuit topology is discussed for achieving a wide-range analog attenuator in MMIC form using enhancement mode FET´s by combining it with a 90° phase shift network. By switching the phase shift network between a 90° phase lead high-pass structure and a 90° phase lag low-pass structure, a dual-purpose circuit is formed comprising both a variable attenuation and 180° phase shift function. The approach requires only a single control voltage for the attenuator and achieves an attenuation range of over 30 dB in L-band with less than 10° of phase imbalance over the range. In the low-loss state, the phase shifter achieves a 10° phase balance over a 250 MHz bandwidth with less than 0.3 dB of amplitude imbalance

Keywords

MMIC; Schottky gate field effect transistors; attenuators; field effect integrated circuits; linear integrated circuits; phase shifters; 250 MHz; 90° phase shift network; L-band; analog MMIC attenuator; circuit topology; enhancement mode MESFETs; integral 180° phase shifter; low-loss state; variable attenuation function; wide range attenuator; Attenuation; Attenuators; Bandwidth; Circuit topology; FETs; L-band; MMICs; Phase shifters; Switching circuits; Voltage control;

fLanguage

English

Journal_Title

Microwave Theory and Techniques, IEEE Transactions on

Publisher

ieee

ISSN

0018-9480

Type

jour

DOI

10.1109/22.265545

Filename

265545