Title :
A BPSK modulator using a ring-hybrid and HFET switches
Author :
Saavedra, Carlos E.
Author_Institution :
Queen´s Univ., Kingston
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;
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
DOI :
10.1109/APMC.2006.4429728
