| A 6-Bit MMIC Digital Attenuator with High Attenuation Accuracy and Small Phase Variation for X-band TR Module Applications |
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In-Kwon Ju, In-Bok Yom, Jeong-Won Lee, Soo-Ho Lee, Chang-Soo Ahn, Sun-Joo Kim, Dong-Un Park, Seung-Hyeup Oh |
1ETRI, RF and Satellite Payload Research Team
2LIG NEX1
3
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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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주인권, 염인복, 이정원, 이수호, 안창수, 김선주, 박동운, 오승엽 |
1한국전자통신연구원 무선RF.탑재기술연구팀
2엘아이지 넥스원
3국방과학연구소
4충남대학교 전기정보통신공학부 |
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| Abstract |
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A 6-bit MMIC digital attenuator applicable to X-band TR module has been developed by using $0.5{mu}m$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 0.4dB, resolution of 0.5dB and dynamic range of 31.5dB. The measurement results show that in-out VSWRs are less than 1.5, phase variation is from -7 to +2 degrees and IIP3 is 36.5dBm. |
| Key Words:
HEMT, Microwave Attenuators, MMICs, Digital Attenuators, Phased-Array Radar |
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