Abstract
An ultra-wideband (2-18GHz) 6-bit MMIC digital attenuator has been designed. The attenuator has been fabricated with 0.5μm GaAs PHEMT process. Low insertion phase shift has been achieved over the main attenuation states. On-wafer measurement results of the developed MMIC chips in the 2-18GHz band show that the 6-bit MMIC digital attenuator has 31.5dB dynamic range stepped by 0.5dB; attenuation accuracy: +2.31dB/-0.51dB; insertion phase shift: +6.28°/-1.53° referenced insertion loss: <;-5.71dB; input/output VSWR: <;2.32; chip size: 2.89mm×1.22mm×0.1mm.
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