A new overlay coupler for direct digital modulator in GaAs HBT

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 tha...

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Veröffentlicht in:	IEEE transactions on microwave theory and techniques 2004-08, Vol.52 (8), p.1830-1835
Hauptverfasser:	Yi Sun, Freundorfer, A.P.
Format:	Artikel
Sprache:	eng
Schlagworte:	Binary phase shift keying Digital modulation Frequency Gallium arsenide Heterojunction bipolar transistors Phase modulation Phase shift keying Reflection Switches Topology
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