An analog MMIC phase modulator for X-band satellite transponder applications

Author

Ali, Fazal ; Mysoor, Narayan

Author_Institution

Westinghouse Electric Corp., Baltimore, MD, USA

Volume

2

Issue

11

fYear

1992

Firstpage

445

Lastpage

446

Abstract

The design and measured performance of a GaAs MMIC (monolithic microwave integrated circuit) analog linear phase modulator for the next-generation space-borne communications systems are presented. The analog phase shifter is based on the reflection-type hybrid coupled approach and uses a novel lumped quadrature hybrid and MESFET varactors as a building block. Three cascaded sections (with tapered varactor sizes) of this building block along with two high-isolation amplifiers have been realized in a single chip (96 mils*36 mils). This MMIC provides an X-band (8415+or-50-MHz) phase modulation with +or-2.6 radians (300 degrees ) of peak phase deviation, +or-2% of phase deviation linearity, 1.5-dB insertion loss, and better than 12-dB input and output return loss performance.<>

Keywords

MMIC; modulators; phase modulation; satellite relay systems; transponders; 1.5 dB; 12 dB; 8.415 GHz; GaAs; MESFET varactors; SHF; X-band; analog MMIC; analog linear phase modulator; cascaded sections; high-isolation amplifiers; hybrid coupled approach; lumped quadrature hybrid; monolithic microwave integrated circuit; reflection-type; satellite transponder applications; space-borne communications systems; tapered varactor sizes; Analog integrated circuits; Gallium arsenide; Integrated circuit measurements; MMICs; Microwave integrated circuits; Microwave measurements; Monolithic integrated circuits; Phase measurement; Phase modulation; Varactors;

fLanguage

English

Journal_Title

Microwave and Guided Wave Letters, IEEE

Publisher

ieee

ISSN

1051-8207

Type

jour

DOI

10.1109/75.165638

Filename

165638