A Switchable Sub-3GHz/Sub-6GHz LNA With 0.4-1.1dB NF Using Triple-Feedback and Tunable Inter-Stage Matching Strategies

IF 4.9 2区工程技术 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC

IEEE Transactions on Circuits and Systems II: Express Briefs Pub Date : 2025-07-02 DOI:10.1109/TCSII.2025.3585444

Zhihao Zhang;Xiaolin Zhou;Jiehai Zhou;Zhixia Du;Gary Zhang

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引用次数: 0

Abstract

A broadband switchable low noise amplifier (LNA), supporting Sub-3GHz and Sub-6GHz modes for a wide range of wireless communication applications, is proposed. To achieve broadband simultaneous noise and impedance matching, a triple-feedback technique combined with a strategically designed inter-stage matching network (ISMN), is analyzed and developed. The dual-mode switchable functionality, offering wideband flat gain performance, is enabled through a switch-based tunable capacitor configuration within the ISMN with adjustable load impedance. Additionally, a current-reuse amplification topology is employed to enhance both gain and linearity while reducing power consumption. Fabricated using 250nm GaAs pHEMT technology, the proposed switchable LNA achieves gain of 21.7-24.2/18.7-21.7dB, noise figure (NF) of 0.4-0.96/0.65-1.1dB, output 1-dB compression point of 15.7-19.7/14.2-19.4dBm, and output third-order intercept point of 25.6-35.1/25.4-34dBm in Mode 1 (0.6-3.5GHz) and Mode 2 (0.6-5.5GHz), respectively. In comparison to Mode 1, the LNA operating in Mode 2 extends the 3-dB gain bandwidth by an additional 2GHz, at the cost of a 3 dB reduction in average gain, an increase of 0.15–0.25dB in NF, and a slight degradation in linearity.

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基于三反馈和可调级间匹配策略的0.4-1.1dB可切换Sub-3GHz/Sub-6GHz LNA

提出了一种支持Sub-3GHz和Sub-6GHz模式的宽带可切换低噪声放大器（LNA），用于广泛的无线通信应用。为了实现宽带同步噪声和阻抗匹配，分析和开发了一种三反馈技术，并结合战略设计的级间匹配网络（ISMN）。双模可切换功能提供宽带平坦增益性能，通过ISMN内具有可调负载阻抗的基于开关的可调电容器配置实现。此外，采用电流复用放大拓扑来提高增益和线性度，同时降低功耗。采用250nm GaAs pHEMT技术制备的可切换LNA，在模式1 （0.6-3.5GHz）和模式2 （0.6-5.5GHz）下，增益为21.7-24.2/18.7-21.7dB，噪声系数（NF）为0.4-0.96/0.65-1.1dB，输出1- db压缩点为15.7-19.7/14.2-19.4dBm，输出三阶截距点为25.6-35.1/25.4-34dBm。与模式1相比，工作在模式2下的LNA将3db增益带宽额外扩展了2GHz，代价是平均增益降低3db， NF增加0.15-0.25dB，线性度略有下降。

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来源期刊

IEEE Transactions on Circuits and Systems II: Express Briefs 工程技术-工程：电子与电气

CiteScore

7.90

自引率

20.50%

发文量

883

审稿时长

3.0 months

期刊介绍： TCAS II publishes brief papers in the field specified by the theory, analysis, design, and practical implementations of circuits, and the application of circuit techniques to systems and to signal processing. Included is the whole spectrum from basic scientific theory to industrial applications. The field of interest covered includes: Circuits: Analog, Digital and Mixed Signal Circuits and Systems Nonlinear Circuits and Systems, Integrated Sensors, MEMS and Systems on Chip, Nanoscale Circuits and Systems, Optoelectronic Circuits and Systems, Power Electronics and Systems Software for Analog-and-Logic Circuits and Systems Control aspects of Circuits and Systems.