S-to-X Band 360-Degree RF Phase Detector IC Consisting of Symmetrical Mixers and Tunable Low-Pass Filters

Akihito HIRAI
Kazutomi MORI
Masaomi TSURU
Mitsuhiro SHIMOZAWA

Publication
IEICE TRANSACTIONS on Electronics   Vol.E104-C    No.10    pp.559-567
Publication Date: 2021/10/01
Publicized: 2021/05/13
Online ISSN: 1745-1353
DOI: 10.1587/transele.2021MMP0002
Type of Manuscript: Special Section PAPER (Special Section on Microwave and Millimeter-Wave Technologies)
Category: 
Keyword: 
RF phase detector,  symmetrical mixer,  tunable low-pass filter,  SiGe-BiCMOS integrated circuits,  

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Summary: 
This paper demonstrates that a 360° radio-frequency phase detector consisting of a combination of symmetrical mixers and 45° phase shifters with tunable devices can achieve a low phase-detection error over a wide frequency range. It is shown that the phase detection error does not depend on the voltage gain of the 45° phase shifter. This allows the usage of tunable devices as 45° phase shifters for a wide frequency range with low phase-detection errors. The fabricated phase detector having tunable low-pass filters as the tunable device demonstrates phase detection errors lower than 2.0° rms in the frequency range from 3.0 GHz to 10.5 GHz.