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Open Access
Variable-Gain Phase Shifter with Phase Compensation Using Varactors

Akihito HIRAI, Yuki TSUKUI, Koji TSUTSUMI, Kazutomi MORI

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Summary :

This paper demonstrates a phase compensation technique using varactors for variable-gain phase shifters (VGPSs). The VGPS consists of an I/Q generator and I/Q variable gain amplifiers (I/Q VGAs). I/Q VGAs based on common-emitter stages are enabled to control the gain by adjusting the collector current of the transistor. However, the phase control performance degenerates because the input capacitance varies with the collector current. The proposed phase compensation technique reduces the variation in the insertion phase of the I/Q VGA by adjusting the voltage of the varactor provided at its input and maintaining the input capacitance constant in any gain state. As a result, the VGPS can provide a low phase and amplitude error under phase control. A Ka-band VGPS with the proposed phase compensation technique, fabricated in a 130-nm SiGe BiCMOS process, demonstrates a 0.73° and 0.06 dB improvement in the RMS phase and amplitude error compared with the case without the compensation technique. The VGPS achieves measured RMS amplitude and phase errors of less than 0.19 dB and 0.75°, respectively, in an amplitude control range of more than 20 dB with a frequency range of 28 to 32 GHz.

Publication
IEICE TRANSACTIONS on Electronics Vol.E106-C No.11 pp.677-688
Publication Date
2023/11/01
Publicized
2023/05/12
Online ISSN
1745-1353
DOI
10.1587/transele.2023MMP0003
Type of Manuscript
Special Section PAPER (Special Section on Microwave and Millimeter-Wave Technologies)
Category

Authors

Akihito HIRAI
  Mitsubishi Electric Corporation Information Technology R&D Center
Yuki TSUKUI
  Mitsubishi Electric Engineering Company, Limited
Koji TSUTSUMI
  Mitsubishi Electric Corporation Information Technology R&D Center
Kazutomi MORI
  Mitsubishi Electric Corporation Information Technology R&D Center

Keyword