Reliability Investigation on S- Band GaAs MMIC

Accelerated life tests and radiation hardness tests have been conducted on GaAs MMICs and tie constituent elements. 0.35 to 1.3 x 10⁸ hours MTF (Median Time to Failure) at 130°C Tch were estimated for a wide band amplifier up to S-band . No failure has been observed on RF operation tests for 3000 hours at Tch of 180°C and 205°C values for 12 samples, respectively. No degradation in the electrical performance was observed up to 1 x 10⁷ rad gamma-ray irradiation with 5% criteria for the the S-band two-stage amplifiers, two-modulus prescalers and their FETs . It has been confirmed that the MMICs prcduced, using NEC´s 0.8 µm long T-shaped WSi gate FET manufacturing process, are sufficiently reliable for practical applications.