Title :
A new overlay coupler for direct digital modulator in GaAs HBT
Author :
Sun, Yi ; Freundorfer, Al P.
Author_Institution :
Dept. of Electr. & Comput. Eng., Queen´´s Univ., Kingston, Ont., Canada
Abstract :
A new overlay coupler has been realized at millimeter-wave frequency with an area that is less than one-half that of the Lange coupler. It was used to construct a binary phase-shift keying (BPSK) modulator, employing balanced reflection topology, in which the HBTs acted as switches. It was shown that the BPSK modulator could be modulated at 1 Gb/s at 28 GHz.
Keywords :
III-V semiconductors; bipolar transistor switches; coplanar waveguides; gallium arsenide; heterojunction bipolar transistors; integrated circuit modelling; millimetre wave couplers; modulators; network topology; quadrature phase shift keying; semiconductor device models; waveguide couplers; 1 Gbit/s; 28 GHz; GaAs; GaAs HBT; Lange coupler; balanced reflection topology; binary phase-shift keying modulator; direct digital modulator; millimeter-wave frequency; overlay coupler; switches; Binary phase shift keying; Digital modulation; Frequency; Gallium arsenide; Heterojunction bipolar transistors; Phase modulation; Phase shift keying; Reflection; Switches; Topology; BPSK; Coplanar couplers; HBT integrated circuits; microwave coupler reflection-type topology; millimeter-wave frequency; millimeter-wave modulator; miniaturized backward-wave coupler; modulator; modulator's phase-shift keying; monolithic balanced binary phase-shift keying;
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
DOI :
10.1109/TMTT.2004.831566
