A 60V Capacitive Gain 27nV/√Hz 137dB CMRR PGA with ±10V Inputs

📋 论文概要

本文实现了一款60V可编程增益放大器(PGA)，支持±10V差分输入范围和5V输出，适用于±24V供电的工业过程控制应用。该设计采用电容增益架构，在存在大共模电压的情况下实现小电压信号的采集，并具有低功耗特性。

💡 主要创新点

• 采用电容增益架构实现60V高压PGA，简化设计并降低功耗。
• 在±10V差分输入和±24V供电下实现27nV/√Hz的低噪声和137dB的高共模抑制比(CMRR)。
• 输出兼容5V ADC，便于与商用模数转换器接口。

🏷 关键词

📄 原文摘要

Analog Devices, Valencia, Spain 1 2 This paper describes the implementation of a 60V programmable-gain amplifier (PGA) with ±10V differential input range and a 5V output compatible with many commercially available ADCs. While there is a wide range of possible applications, this design is particularly well suited for ±24V supply industrial process control applications, where small voltage signals need to be acquired in the presence of very large common-mode voltages. Capacitive gain PGAs are gaining popularity due to their relative simplicity and the resulting low power dissipation [1-4]. The gain network itself is noiseless and does not dissipate static power. Compared to resistive networks [5], selfheating is negligible, and often an operational transconductance amplifier (OTA) is sufficient to drive the feedback network. Noise performance for a given power dissipation is further optimized as only a single low noise input differential pair

👥 作者与机构

Christian Birk1, Gerard Mora-Puchalt2

Analog Devices, Cork, Ireland