title   
  

A phase-calibration method for vector-sum phase shifters using a self-generated LUT

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Kalyoncu, İlker and Özeren, Emre and Burak, Abdurrahman and Ceylan, Ömer and Gürbüz, Yaşar (2019) A phase-calibration method for vector-sum phase shifters using a self-generated LUT. IEEE Transactions on Circuits and Systems I: Regular Papers, 66 (4). pp. 1632-1642. ISSN 1549-8328 (Print) 1558-0806 (Online)

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Official URL: http://dx.doi.org/10.1109/TCSI.2018.2885172

Abstract

This paper presents a new self-calibration method for vector-sum phase shifters (PS) to compensate for process variations and achieve reconfigurable operating frequency. The calibration system generates a look-up table for the control voltages of the variable-gain amplifiers of the PS to minimize the rms phase error at a frequency of interest. The calibration system consists of a coupled-line coupler, an amplifier, a power detector (PD), an analog-to-digital converter, and a data processing unit. In this calibration method, first, the amplitudes of IQ vectors are swept and their powers are measured. Then, phase errors are calculated from these power measurements using the cosine formula. Finally, the vector pairs providing the least phase error are chosen for each desired phase shift. The practicality of the proposed system is demonstrated by realizing a self-calibrated X-band 7-b PS fabricated in IHP 0.25-mu m SiGe BiCMOS technology, including the on-chip coupler, amplifier, and PD. The calibration system improves the rms phase error by at least 1 degrees, does not degrade the rms gain error, and increases the insertion loss by 1.6 dB. The self-calibrated PS achieves a 2 degrees rms phase error across X-band frequencies. The overall chip size is 2.6 mm(2). The power consumption of the PS and the overall system are 110 and 233 mW, respectively. This built-in calibration system mitigates process variation effects, and the performance of the PS can he optimized for any center frequency across X-band.

Item Type:Article
Uncontrolled Keywords:Self-calibration; phase shifter calibration; look-up table; vector-sum phase shifter; process compensation; SiGe; BiCMOS
Subjects:UNSPECIFIED
ID Code:37010
Deposited By:Yaşar Gürbüz
Deposited On:16 May 2019 12:09
Last Modified:17 May 2019 14:45

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