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A 10–19.2GHz LNA Using a Partially Three-Winding Transformer and Class-AB Operation Achieving -5.3 to -2.4 dBm IP1dB for 6G FR3 Receivers
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- Authors
- Min-Seok Baek, Joon-Hyung Kim, Jae-Hyeok Song, Jong-Seong Park, Ilhun Kim, Eun-Gyu Lee, Seong-Mo Moon, Dong-Pil Chang, Choul-Young Kim
- Issue Date
- 2026-06
- Citation
- Radio Frequency Integrated Circuits (RFIC) Symposium 2026, pp.211-214
- Publisher
- IEEE
- Language
- English
- Type
- Conference Paper
- Abstract
- This paper presents a 10–19.2 GHz wideband low-noise amplifier (LNA) that achieves enhanced linearity and low noise by employing a partially three-winding transformer and a differential Class-AB output stage. The partially three-winding transformer in the first stage provides wideband input matching and gain boosting, enabling a low noise figure without relying on resistive feedback. The differential Class-AB second stage improves voltage swing capability and enhances large-signal behavior, resulting in higher IP1dB and robust blocker tolerance across the operating band. The proposed LNA is implemented in a 65-nm CMOS technology as a two-stage architecture. Measurement results demonstrate a 3-dB bandwidth of 10–19.2 GHz, a peak gain of 16.3 dB, a minimum noise figure of 2.13 dB, and a consistent IP1dB ranging from -5.3 to -2.4 dBm while consuming 13 mW from a 1-V supply. The design occupies a compact core area of 0.12 mm².
- Keyword
- 6G, blocker tolerance, Class-AB, FR3 band, low- noise amplifier (LNA), partially three-winding transformer
- KSP Keywords
- 2 mm, 3-dB bandwidth, CMOS Technology, Class AB(CAB), Core area, First stage, Gain boosting, Low noise figure, Low-noise amplifier(LNA), Minimum noise figure, Output Stage