Title :
A 5.8 GHz QPSK modulator
Author :
Psaltakis, M. ; Vafiadis, E. ; Sahalos, J.N.
Author_Institution :
Dept. of Phys., Aristotle Univ. of Thessaloniki, Greece
Abstract :
Summary form only given. A QPSK modulator can be configured with a 90° coupler, two balanced (BPSK) modulators, and a power combiner. In the modulator of the present design the LO carrier operating at fc=5.8 GHz is connected to the input of a conventional 90° branch line hybrid producing the two signal paths in phase quadrature, to be used in BPSK modulators. The stream of polar (NRZ) pulses applied to each modulator has a data rate of 100 Mbps. Balanced modulators implemented as passive balanced mixers by use of rat-race hybrids and Schottky diodes. For diodes, the HP device HSMS-202 has been used. It contains a pair of Schottky diodes properly connected for mixer applications and it is offered in a surface mount package suitable for MIC implementations
Keywords :
Schottky diode mixers; microwave integrated circuits; microwave mixers; modulators; power combiners; quadrature phase shift keying; surface mount technology; 100 Mbit/s; 5.8 GHz; 90° branch line hybrid; 90° coupler; HSMS-202; LO carrier; MIC implementations; QPSK modulator; SHF; Schottky diodes; balanced modulators; data rate; passive balanced mixers; polar NRZ pulses; power combiner; rat-race hybrids; surface mount package; Binary phase shift keying; Microwave integrated circuits; Optical signal processing; Packaging; Phase modulation; Power combiners; Pulse modulation; Quadrature phase shift keying; Schottky diodes; Signal design;
Conference_Titel :
Applied Electromagnetism, 2000. Proceedings of the Second International Symposium of Trans Black Sea Region on
Conference_Location :
Xanthi
Print_ISBN :
0-7803-6428-7
DOI :
10.1109/AEM.2000.943265
