Title :
Miniature X-band GaAs MMIC analog and bi-phase modulators for spaceborne communications applications
Author :
Mysoor, N.R. ; Ali, F.
Author_Institution :
Jet Propulsion Lab., California Inst. of Technol., Pasadena, CA, USA
Abstract :
The design concepts, analyses, and the development of GaAs monolithic microwave integrated circuit (MMIC) linear-phase and digital modulators for the next generation of spaceborne communications systems are summarized. The design approach uses a very compact lumped-element, quadrature hybrid, and MESFET-varactors to provide low-loss and well-controlled phase performance for deep-space transponder (DST) applications. The measured results of the MESFET-diode show a capacitance range of 2:1 under reverse bias, and a Q of 38 at 10 GHz. Three cascaded sections of hybrid-coupled reflection phase shifters have been modeled and simulations performed to provide an X-band (8415+or-50 MHz) DST phase modulator with +or-2.5 radians of peak phase deviation.<>
Keywords :
III-V semiconductors; MMIC; Schottky gate field effect transistors; field effect integrated circuits; gallium arsenide; modulators; phase shifters; space communication links; transponders; varactors; 10 GHz; 8365 to 8465 MHz; GaAs; MESFET-diode; MESFET-varactors; X-band; analogue modulators; bi-phase modulators; deep space transponder; deep-space transponder; digital modulators; hybrid-coupled reflection phase shifters; linear-phase; monolithic microwave integrated circuit; quadrature hybrid varactors; spaceborne communications applications; Capacitance measurement; Digital integrated circuits; Digital modulation; Gallium arsenide; MESFETs; MMICs; Microwave integrated circuits; Monolithic integrated circuits; Q measurement; Transponders;
Conference_Titel :
Aerospace Applications Conference, 1992. Digest., 1992 IEEE
Conference_Location :
Snowmass, CO, USA
Print_ISBN :
0-7803-0225-7
DOI :
10.1109/AERO.1992.200378
