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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.
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
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Akihito HIRAI, Yuki TSUKUI, Koji TSUTSUMI, Kazutomi MORI, "Variable-Gain Phase Shifter with Phase Compensation Using Varactors" in IEICE TRANSACTIONS on Electronics,
vol. E106-C, no. 11, pp. 677-688, November 2023, doi: 10.1587/transele.2023MMP0003.
Abstract: 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.
URL: https://global.ieice.org/en_transactions/electronics/10.1587/transele.2023MMP0003/_p
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@ARTICLE{e106-c_11_677,
author={Akihito HIRAI, Yuki TSUKUI, Koji TSUTSUMI, Kazutomi MORI, },
journal={IEICE TRANSACTIONS on Electronics},
title={Variable-Gain Phase Shifter with Phase Compensation Using Varactors},
year={2023},
volume={E106-C},
number={11},
pages={677-688},
abstract={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.},
keywords={},
doi={10.1587/transele.2023MMP0003},
ISSN={1745-1353},
month={November},}
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TY - JOUR
TI - Variable-Gain Phase Shifter with Phase Compensation Using Varactors
T2 - IEICE TRANSACTIONS on Electronics
SP - 677
EP - 688
AU - Akihito HIRAI
AU - Yuki TSUKUI
AU - Koji TSUTSUMI
AU - Kazutomi MORI
PY - 2023
DO - 10.1587/transele.2023MMP0003
JO - IEICE TRANSACTIONS on Electronics
SN - 1745-1353
VL - E106-C
IS - 11
JA - IEICE TRANSACTIONS on Electronics
Y1 - November 2023
AB - 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.
ER -