A Compact 11–27.3 GHz CMOS LNA Employing a 5-in-1 Transformer Feedback for Wideband Operation
Journal
IEEE MTT-S International Microwave Symposium Digest
Start Page
335
End Page
338
ISBN
[9798331547660]
Date Issued
2026-06-07
Author(s)
Tsai, Liang-Chen
Abstract
This work presents a compact wideband LNA employing a 5-in-1 transformer. The design integrates a sourcedegeneration LNA with shunt-series feedback (SD-SSF) and a drain-to-gate transformer feedback path combined with a coupling-tuned resonant tank (CTRT). The design reduces the number of active stages through the current reuse technique, lowering chip area and power consumption while maintaining broadband gain and low noise. Implemented in 65-nm CMOS, the LNA achieves a peak gain of 13.8 dB from 11 to 27.3 GHz, with an in-band noise figure (NF) of 2.5-4.5 dB and a minimum NF of 2.5 dB. The circuit occupies a 0.13 mm2 core area and consumes 8 mW, demonstrating efficient wideband performance with reduced size and power.
Event(s)
2026 IEEE MTT-S Radio Frequency Technology and Techniques Symposium, IMS RFTT 2026
Subjects
area-efficient
CMOS
low-noise amplifier
millimeter-wave systems
transformer
wideband
Publisher
IEEE
Type
conference paper