具有精确db -线性特性的超低噪声变增益放大器

2020 27th IEEE International Conference on Electronics, Circuits and Systems (ICECS) Pub Date : 2020-11-23 DOI:10.1109/ICECS49266.2020.9294852

Bingtian Chen, Yufeng Zhang, Jianxiong Xi, Lenian He

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引用次数: 0

摘要

介绍了一种基于增益插值的高性能db -线性可变增益放大器(VGA)。VGA核心使用电阻阶梯作为衰减器，以获得输入信号的不同衰减步骤。通过平滑地将增益从一个步骤移动到下一个步骤，实现了精确的db线性增益特性。集成了一个低噪声放大器和一个后置放大器，分别获得低噪声和高线性度。该芯片采用180nm SiGe工艺制造，芯片面积为1.15mm2。总增益范围为48dB，测量增益误差小于0.27dB。整个VGA从5V电源消耗30mA电流，带宽为120MHz。测量到的带内输入参考噪声密度为1nV/√HZ，测量到的OIP3为33dBm。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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An Ultra-low Noise Variable Gain Amplifier with Accurate dB-Linear Characteristic

In this paper, a high-performance dB-linear variable gain amplifier (VGA) based on gain interpolation is introduced. The VGA core uses a resistor ladder as an attenuator to get different attenuation steps of the input signal. By smoothly moving the gain from one step to the next step, an accurate dB-linear gain characteristic is achieved. A low noise amplifier and a post amplifier are integrated to get lower noise and ensure high linearity, respectively. The chip is fabricated in a 180nm SiGe process and occupies a die area of 1.15mm2. The total gain range is 48dB and the measured gain error is less than 0.27dB. The whole VGA consumes 30mA current from a 5V supply and the bandwidth is 120MHz. The measured in-band input referred noise density is 1nV/√HZ and the measured OIP3 is 33dBm.

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来源期刊

2020 27th IEEE International Conference on Electronics, Circuits and Systems (ICECS)

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