A BPSK modulator using a ring-hybrid and HFET switches

Author

Saavedra, Carlos E.

Author_Institution

Queen´s Univ., Kingston

fYear

2006

fDate

12-15 Dec. 2006

Firstpage

1665

Lastpage

1668

Abstract

A binary phase-shift keying (BPSK) modulator using a microstrip ring-hybrid and HFET switches is proposed here. The fabricated BPSK modulator works from 3.2 GHz to 3.5 GHz with output amplitude balance less than 1 dB and phase balance within 2deg of ideal 180deg. Its conversion loss is around 6.7 dB and relative flat across this frequency range. Around its center frequency, the amplitude balance is less than 0.1 dB and the phase balance is almost ideal 180deg. This results in a perfect square- wave modulation spectrum with carrier suppression over 40 dB and spurious suppression over 33 dB. The fabricated modulator has better power performance than the previously-published modulators.

Keywords

high electron mobility transistors; microwave field effect transistors; microwave switches; modulators; phase shift keying; BPSK modulator; HFET switches; carrier suppression; frequency 3.2 GHz to 3.5 GHz; microstrip ring-hybrid switches; output amplitude balance; perfect square-wave modulation spectrum; phase balance; Binary phase shift keying; Circuit topology; Frequency; HEMTs; MODFETs; Microstrip; Phase modulation; Power dividers; Switches; Switching circuits; BPSK modulator; HFET; hybrid; microstrip; switch;

fLanguage

English

Publisher

ieee

Conference_Titel

Microwave Conference, 2006. APMC 2006. Asia-Pacific

Conference_Location

Yokohama

Print_ISBN

978-4-902339-08-6

Electronic_ISBN

978-4-902339-11-6

Type

conf

DOI

10.1109/APMC.2006.4429728

Filename

4429728