A 60-GHz Variable-Gain Power Amplifier With a Switchable Inductor for TDD Systems

被引：3
作者：
Feng, Jing [1 ,2 ]
Lu, Lin [1 ,2 ]
Chen, Xin [1 ,2 ]
Sun, Yi [1 ,2 ]
Wu, Xu [1 ,2 ]
Fan, Xiangning [1 ,2 ]
Li, Lianming [1 ,2 ]
机构：
[1] Southeast Univ, Sch Informat Sci & Engn, Nanjing 210096, Peoples R China
[2] Purple Mt Labs, Nanjing 211100, Peoples R China
来源：
IEEE MICROWAVE AND WIRELESS TECHNOLOGY LETTERS | 2024年 / 34卷 / 05期
关键词：
Switches; Gain; Inductors; Phased arrays; Insertion loss; Transistors; Impedance; 60-GHz; CMOS; Gilbert; off-impedance; power amplifier (PA); transmit/receive switch (TRSW); variable gain; SPDT SWITCH; FRONT-END; DESIGN;
D O I：
10.1109/LMWT.2024.3379325
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
This letter presents a four-stage variable-gain power amplifier (VGPA) for 60-GHz time division duplex (TDD) phased array systems. To reduce the loading effect of the off-state VGPA on the receiver (Rx), a switchable inductor is proposed as an antenna transmit/receive switch (TRSW), which introduces low insertions loss to the VGPA output matching in transmitter (Tx) mode while providing a high off-impedance in Rx mode. To improve the output dynamic range, a Gilbert-based X-type variable-gain stage with low phase variation is designed. With measurements, the VGPA realizes a 25.4-dB peak gain with a BW3 dB from 49 to 67 GHz, and a <2.6(degrees) rms phase error is achieved over a 15-dB gain tuning range. The measured OP1 dB, P-sat, OIP3 ,PAE (1 dB), and PAE(max) are 11.3, 12.2, 16.2 dBm, 6.4%, and 8.9%, respectively. When the PA and the switchable inductor are turned off, a > 180 Omega output off-impedance is achieved over the interested frequency range.
引用
收藏
页码：512 / 515
页数：4
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