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An MMIC multi-function chip for an X-band active phased array radar system has been designed and fabricated using a 0.5 GaAs p-HEMT commercial process. A digital serial-to-parallel converter is included in this chip in order to reduce the number of the control interface. The multi-function chip provides several functions: 6-bit phase shifting, 6-bit attenuation, transmit/receive switching, and signal amplification. The fabricated multi-function chip with a relative compact size of 24 (6 mm4 mm) exhibits a transmit/receive gain of 24/15 dB and a P1dB of 21 dBm from 8.5 GHz to 10.5 GHz. The RMS errors for the 64 states of the 6-bit phase shift and attenuation were measured to and 0.3 dB, respectively over the frequency.

A GaAs MMIC Multi-Function Chip with a Digital Serial-to-Parallel Converter for an X-band Active Phased Array Radar System