Title :
A 1.9 GHz-band GaAs direct-quadrature modulator IC with a phase shifter
Author :
Yamamoto, K. ; Maemura, K. ; Andoh, N. ; Noda, M. ; Oki, K. ; Ishida, H. ; Mitsui, Y. ; Otsubo, M. ; Mitsui, S.
Author_Institution :
Mitsubishi Electric Corp., Tokyo, Japan
Abstract :
A 1.9-GHz-band direct-quadrature modulator IC has been developed for digital cordless telephone use. In the 1.9-GHz high-frequency band, both carrier and image rejections as low as -40 dBc have been obtained with low-power dissipation of 110 mW, corresponding to phase error below 1.1 degrees . A newly developed circuit configuration, which combines a quadrature phase shifter with drivers, make this excellent spectrum efficiency and low-power dissipation possible. This modulator IC is expected to contribute to the realization of enhanced digital mobile communication systems such as digital and cordless digital cellular telephones.<>
Keywords :
III-V semiconductors; MMIC; digital radio systems; gallium arsenide; mobile radio systems; modulators; phase shifters; 1.9 GHz; 110 mW; digital cordless telephone use; digital mobile communication; direct-quadrature modulator IC; image rejections; low-power dissipation; phase error; phase shifter; spectrum efficiency; Digital integrated circuits; Digital modulation; Driver circuits; Equations; Frequency conversion; Gallium arsenide; Mobile communication; Phase modulation; Phase shifters; Telephony;
Conference_Titel :
Gallium Arsenide Integrated Circuit (GaAs IC) Symposium, 1992. Technical Digest 1992., 14th Annual IEEE
Conference_Location :
Miami Beach, FL, USA
Print_ISBN :
0-7803-0773-9
DOI :
10.1109/GAAS.1992.247228
