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首页> 外文期刊>Canadian journal of electrical and computer engineering >A low-power 75 dB digitally programmable variable-gain amplifier in 0.18;C;m CMOS
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A low-power 75 dB digitally programmable variable-gain amplifier in 0.18;C;m CMOS

机译：采用0.18; C; m CMOS的低功耗75 dB数字可编程可变增益放大器

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摘要

Variable-gain amplifiers (VGAs) are essential building blocks of many communication systems. In this paper, a monolithic low-power digitally programmable VGA with 75 dB of gain range is presented. The core of the design is based on a low-distortion source-degenerated differential amplifier structure. The gain is varied by changing the source-degeneration resistor and tuning the resistors in the common-mode feedback circuitry. The complete VGA consists of three gain stages. As a proof of concept, a 24 dB single-gain stage with 2 dB gain steps is fabricated in a 0.18 驴m CMOS technology. The prototype chip is tested, and measurement results are obtained. Based on these results, the gain stage is redesigned to optimize its performance, and a three-stage 75 dB VGA is designed and simulated. Each stage has a digitally tunable gain range of 25 dB. The overall gain can be varied from 驴15 dB to 60 dB in 2.5 dB gain steps. The bandwidth of the multi-stage VGA is higher than 140 MHz, and the gain error is less than 0.3 dB. The overall VGA draws 6.5mA from a 1.8V power supply. The noise figure of the system at maximum gain is 12.5 dB, and the third-order intermodulation intercept point (IIP3) at minimum gain is 14.4 dBm.
机译：可变增益放大器（VGA）是许多通信系统的基本组成部分。本文介绍了增益范围为75 dB的单片低功耗数字可编程VGA。设计的核心是基于低失真源退化的差分放大器结构。通过改变源极退化电阻器和调整共模反馈电路中的电阻器来改变增益。完整的VGA由三个增益级组成。作为概念验证，采用0.18驴CMOS技术制造了具有2 dB增益阶跃的24 dB单增益级。测试了原型芯片，并获得了测量结果。根据这些结果，重新设计了增益级以优化其性能，并设计并仿真了一个三级75 dB VGA。每个级的数字可调增益范围为25 dB。总增益可以从驴15分贝到60分贝，以2.5分贝的增益步长变化。多级VGA的带宽高于140 MHz，增益误差小于0.3 dB。整个VGA从1.8V电源汲取6.5mA电流。系统在最大增益下的噪声系数为12.5 dB，最小增益下的三阶互调截点（IIP3）为14.4 dBm。

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