A QPSK direct digital modulator in GaAs HBT at 28 GHz

Autor:	Yi Sun, A.P. Freundorfer, D. Sawatzky
Rok vydání:	2006
Předmět:	One half Engineering business.industry Heterojunction bipolar transistor Electrical engineering Topology (electrical circuits) Gallium arsenide chemistry.chemical_compound Amplitude chemistry Power dividers and directional couplers Optoelectronics business Communication channel Phase-shift keying
Zdroj:	Canadian Conference on Electrical and Computer Engineering, 2005..
DOI:	10.1109/ccece.2005.1557349
Popis:	A new overlay coupler and power combiner have been realized at millimeter-wave frequency. The coupler and power combiner have an area that is less than one half that of the Lange coupler and two-stage Wilkinson power combiner respectively. They were used to construct a QPSK modulator, employing balanced reflection topology, in which the HBTs acted as switches. The QPSK channel showed plusmn0.4 dB amplitude imbalance and plusmn2deg phase error over 24~32 GHz
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::768d8cfa0f24af6353ba97b4ccd6ce29 https://doi.org/10.1109/ccece.2005.1557349 Zobrazit plný text záznamu