Miniature X-band GaAs MMIC analog and bi-phase modulators for spaceborne communications applicationsThe 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 +/- 50 MHz) DST phase modulator with +/-2.5 radians of peak phase deviation.
Document ID
19930030687
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Mysoor, Narayan R. (JPL Pasadena, CA, United States)
Ali, Fazal (Pacific Monolithics Co. Sunnyvale, CA, United States)