具有指数增益控制的CMOS低失真变增益放大器

2006 IEEE Asian Solid-State Circuits Conference Pub Date : 2006-11-01 DOI:10.1109/ASSCC.2006.357929

Li Yin, Ting-Hua Yun, Jian-hui Wu, L. Shi

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引用次数: 4

摘要

本文采用跨导线性化方法，设计了一种指数增益控制的CMOS低失真变增益放大器。该VGA由基于电流转向结构的VGA核、基于差分对传输特性的指数电压发生器和定增益放大器级组成。在0.25 μ m CMOS技术上对所提出的VGA电路进行了验证，测量结果表明，总增益控制范围为40 dB, 3-dB带宽为100 MHz，差分输出2 Vpp时三阶互调失真为-58.5dBc，最大增益时噪声系数为8.6 dB。

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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A CMOS Low-Distortion Variable Gain Amplifier with Exponential Gain Control

In this paper, a CMOS low-distortion variable gain amplifier with exponential gain control is developed by utilizing a transconductance linearization scheme. The VGA is composed of a VGA core based on current-steering structure, an exponential voltage generator based on transfer characteristics of differential pair, and a stage of fixed gain amplifier. The proposed VGA circuit was verified in 0.25 mum CMOS technology, the measurement results show a total gain control range of 40 dB, the 3-dB bandwidth is 100 MHz, and a -58.5dBc third-order inter-modulation distortion at differential output of 2 Vpp are obtained, the noise figure at maximum gain is 8.6 dB.

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2006 IEEE Asian Solid-State Circuits Conference

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