Title :
GaAs / Si MMICs Synthesized Upconverter for Broadband Tuners in Optical-Fiber CATV Systems
Author :
Ohira, T. ; Hirota, T. ; Hiraoka, T. ; Nakagawa, T. ; Aikawa, M. ; Suto, K. ; Kokubun, T. ; Yoneda, E.
Author_Institution :
NTT Radio Communication Systems Laboratories., 1-2356 Take, Yokosuka, 238-03 Japan.
Abstract :
A novel frequency-synthesized upconverter has been developed by implementing GaAs and Si MMICs, and applied to ultra broadband FM-FDM video tuners. The upconverter includes 3 chips of GaAs MMICs: a dual-output voltage controlled oscillator (VCO), an interstage amplifier and a balanced mixer, as well as 2 chips of Si MMICs: a high speed prescaler and a frequency counter. The measured phase noise is ¿80 dBc/Hz at 1 kHz offset and two-tone intermodulation intercept is +3 dBm. Implementing this upconverter into an FM video tuner, successful performance has been obtained as tuning bandwidth broader than 2 GHz and video weighted S/N ratio of +55 dB. This will possibly be the key device in future video distribution systems through optical fiber networks.
Keywords :
Broadband amplifiers; Control system synthesis; Frequency; Gallium arsenide; High speed optical techniques; MMICs; Optical amplifiers; Stimulated emission; Tuners; Voltage-controlled oscillators;
Conference_Titel :
Microwave Conference, 1991. 21st European
Conference_Location :
Stuttgart, Germany
DOI :
10.1109/EUMA.1991.336347
