Title :
A compact, monolithic radiofrequency demodulator-modulator for 64-QAM digital radio links
Author :
Telliez, I. ; Couturier, A.M. ; Rumelhard, C. ; Versnaeyen, C. ; Champion, P. ; Fayol, D.
Author_Institution :
Thomson Composants Microondes, Orsay, France
Abstract :
The design, fabrication, and performance of a GaAs monolithic radiofrequency demodulator with phase and amplitude trimming in the quadrature coupler and balanced mixers in the 5.9-8.5 GHz range is described. This circuit includes amplitude and phase trimming circuits, two single balanced mixers, couplers, and a quadrature phase comparator. The design is such that the same chip can be used either as a direct 64 QAM (quadrature amplitude modulation) demodulator or a modulator. The small chip size is 2.7 mm*3.65 mm.<>
Keywords :
III-V semiconductors; MMIC; amplitude modulation; demodulators; digital radio systems; gallium arsenide; microwave links; modulators; 5.9 to 8.5 GHz; 64-QAM; GaAs; SHF; amplitude trimming; balanced mixers; digital radio links; monolithic microwave IC; phase trimming circuits; quadrature amplitude modulation; quadrature coupler; quadrature phase comparator; radiofrequency demodulator-modulator; Costs; Coupling circuits; Demodulation; Digital communication; Fabrication; Phase modulation; Quadrature amplitude modulation; Quadrature phase shift keying; Radio frequency; Radio link;
Conference_Titel :
Microwave and Millimeter-Wave Monolithic Circuits Symposium, 1991. Digest of Papers, IEEE 1991
Conference_Location :
Boston, MA, USA
Print_ISBN :
0-7803-0087-4
DOI :
10.1109/MCS.1991.148078
