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Design of Ultra Wide Band MMIC Digital Attenuator with High Attenuation Accuracy  

Ju Inkwon (Satellite Communication RF Technology Team, ETRI)
Yom In-Bok (Satellite Communication RF Technology Team, ETRI)
Publication Information
The Journal of Korean Institute of Electromagnetic Engineering and Science / v.17, no.2, 2006 , pp. 101-109 More about this Journal
Abstract
A broadband, DC to 40 GHz 5-bit MMIC digital attenuator has been developed. The ultra broadband attenuator has been achieved by adding transmission lines in the conventional Switched-T attenuator and optimizing the transmission line parameters. Momentum simulation was performed in design for accurate performance prediction at high frequencies and Monte Carlo analysis was applied to verify the performance stability against the MMIC process variation. The attenuator has been fabricated with $0.15\;{\mu}m$ GaAs pHEMT process. This attenuator has 1 dB resolution and 23 dB dynamic ranges. High attenuation accuracy has been achieved over all attenuation ranges and 40 GHz bandwidth with the reference state insertion loss of less than 6 dB at 20 GHz. The input and output return losses of the attenuator are better than 14 dB over all attenuation states and frequencies. The measured IIP3 of the attenuator is 33 dBm.
Keywords
HEMT; Microwave Attenuators; MMICs; Digital Attenuators; UWB;
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