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X-band 송수신 모듈을 위한 높은 감쇠 정확도와 작은 위상 변동을 가진 6 비트 MMIC 디지털 감쇠기
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- Issue Date
- 2009-08
- Citation
- 한국군사과학기술학회지, v.12, no.4, pp.452-459
- ISSN
- 1598-9127
- Publisher
- 한국군사과학기술학회(KIMST)
- Language
- Korean
- Type
- Journal Article
- Abstract
- A 6-bit MMIC digital attenuator applicable to X-band TR module has been developed by using 0.5㎛ GaAs pHEMT processes. The Switched-T attenuator scheme and the switched-path attenuator scheme were adopted to obtain low insertion loss and small phase variation, respectively. Resistors and transmission lines are optimized to achieve the digital attenuator with high attenuation accuracy and small phase variation. The digital attenuator has RMS error of 0.4㏈, resolution of 0.5㏈ and dynamic range of 31.5㏈. The measurement results show that in-out VSWRs are less than 1.5, phase variation is from -7 to +2 degrees and IIP3 is 36.5㏈m.
- KSP Keywords
- GaAs PHEMT, RMS error, T/R Module, Transmission line, digital attenuator, dynamic range, low insertion loss, measurement results, phase variation, x-band