A 6.5-12-GHz Balanced Variable-Gain Low-Noise Amplifier with Frequency-Selective Gain Equalization Technique

Huiyan Gao, Nayu Li, Min Li, Shaogang Wang, Zijiang Zhang, Yen Cheng Kuan, Chunyi Song, Xiaopeng Yu, Qun Jane Gu, Zhiwei Xu*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

This article presents a wideband balanced variable-gain low-noise amplifier (VG-LNA) implemented in a 55-nm CMOS process. The proposed LNA has two cascode stages with an interstage matching transformer to constitute a fourth-order magnetically coupled resonator with two resonant peaks. The frequency-selective gain equalization technique is proposed to compensate for the gain variation of interstage dual-resonant tanks. This VG-LNA leverages a current-steering technique to realize a phase-invariant 18-dB tunable gain range with a measured input 1-dB gain compression point (IP -{mathrm {1,dB}} ) at 9 GHz from -12.2 to -5 dBm. The LNA achieves a power gain of 20.2 dB with ±0.5-dB gain variation and a noise figure (NF) of 3.26 dB from 6.5 to 12 GHz. Due to the lumped Lange couplers, the input and output matching are both better than -14 dB. This chip occupies 1.44times0.68 mm2 area excluding pads and consumes 75 mW.

Original languageEnglish
Article number9280365
Pages (from-to)732-744
Number of pages13
JournalIEEE Transactions on Microwave Theory and Techniques
Volume69
Issue number1
DOIs
StatePublished - Jan 2021

Keywords

  • Balanced amplifier
  • frequency-selective gain equalization technique
  • magnetically coupled resonator (MCR)
  • noise matching
  • variable-gain low-noise amplifier (VG-LNA)

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