A 9–12 GHz 5-bit active LO phase shifter with a new vector sum method

This paper presents a 5-bit active LO phase shifter with a new vector sum method for 9–12 GHz applications. The 5-bit phase shifter is composed of four 3-bit sub phase shifters by adopting the new vector sum method, which reduces the requirements on the resolution of the variable gain amplifier（VGA）...

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Bibliographic Details
Published inJournal of semiconductors Vol. 36; no. 1; pp. 140 - 149
Main Author 陈昌铭 李巍 李宁 任俊彦
Format Journal Article
LanguageEnglish
Published 2015
Subjects
CMOS技术
Electric potential
GHz
Mathematical analysis
Noise levels
Phase shifters
Semiconductors
Variable gain
Vectors (mathematics)
Voltage
偏置电流
可变增益放大器
并行输入
相位误差
矢量和
移相器
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ISSN1674-4926
DOI10.1088/1674-4926/36/1/015002

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Summary:This paper presents a 5-bit active LO phase shifter with a new vector sum method for 9–12 GHz applications. The 5-bit phase shifter is composed of four 3-bit sub phase shifters by adopting the new vector sum method, which reduces the requirements on the resolution of the variable gain amplifier（VGA）. The variable gain function is realized by switch on/off parallel input transistor pairs rather than changing the bias current of the VGA,which avoids the linearity variation and drain-source voltage variation existing in the quadrature vector sum active phase shifter. The 5-bit active LO phase shifter is fabricated in TSMC 0.13μm CMOS technology. The measured results show that the phase shifter achieves 5-bit phase shift accuracy. The average conversion gain for 32 phase states is 0：5 to 7 d B from 9 to 12 GHz. The RMS gain error and the RMS phase error are smaller than 0.8 d B and 4° respectively. The current consumption is 27.7 m A from a 1.2 V supply voltage.
Bibliography:active phase shifter vector sum LO CMOS
Chen Changming, Li Wei, Li Ning, and Ren Junyan（State Key Laboratory of ASIC ＆ System, Fudan University, Shanghai 201203, China）
This paper presents a 5-bit active LO phase shifter with a new vector sum method for 9–12 GHz applications. The 5-bit phase shifter is composed of four 3-bit sub phase shifters by adopting the new vector sum method, which reduces the requirements on the resolution of the variable gain amplifier（VGA）. The variable gain function is realized by switch on/off parallel input transistor pairs rather than changing the bias current of the VGA,which avoids the linearity variation and drain-source voltage variation existing in the quadrature vector sum active phase shifter. The 5-bit active LO phase shifter is fabricated in TSMC 0.13μm CMOS technology. The measured results show that the phase shifter achieves 5-bit phase shift accuracy. The average conversion gain for 32 phase states is 0：5 to 7 d B from 9 to 12 GHz. The RMS gain error and the RMS phase error are smaller than 0.8 d B and 4° respectively. The current consumption is 27.7 m A from a 1.2 V supply voltage.
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ISSN:1674-4926
DOI:10.1088/1674-4926/36/1/015002