Design and Analysis of a Continuously Tunable Low Noise Amplifier for Software Defined Radio

被引：8

作者：

Aneja, Aayush ^{[1
]}

Li, Xue Jun ^{[1
]}

机构：

[1] Auckland Univ Technol, Dept Elect & Elect Engn, Auckland 1010, New Zealand

来源：

SENSORS | 2019年 / 19卷 / 06期

关键词：

green radio; software defined radio; low noise amplifier; transformer network; tuning transistor; phase shifter; CMOS LNA; REJECTION; RECEIVER;

D O I：

10.3390/s19061273

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

This paper presents the design and analysis of a continuously tunable low noise amplifier (LNA) with an operating frequency from 2.2 GHz to 2.8 GHz. Continuous tuning is achieved through a radio frequency impedance transformer network in the input matching stage. The proposed circuit consists of four stages, namely transformer stage, tuning stage, phase shifter and gain stage. Frequency tuning is controlled by varying output current through bias voltage of tuning stage. The circuit includes an active phase shifter in the feedback path of amplifier to shift the phase of the amplified signal. Phase shift is required to further achieve tunability through transformer. The LNA achieves a maximum simulated gain of 18 dB. The LNA attains a perfect impedance match across the tuning range with stable operation. In addition, it achieves a minimum noise figure of 1.4 dB.

引用

页数：16

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