A Chopper-Stabilized Amplifier with a Relaxed Fill-In Technique and 22.6pA Input Current

📋 论文概要

该论文提出了一种采用松弛填充技术的斩波稳定放大器，以解决因放大器延迟导致的输入信号与斩波时钟交互引起的互调失真问题。该技术通过减少输出尖峰，显著改善了线性度，并实现了22.6pA的超低输入电流。

💡 主要创新点

• 提出松弛填充技术（Relaxed Fill-In Technique），在不增加功耗的前提下补偿斩波放大器中的时间失配，抑制互调失真。
• 实现了22.6pA的极低输入电流，适用于高精度传感器接口等应用。

🏷 关键词

📄 原文摘要

now at Broadcom, Bunnik, The Netherlands 1 2 In chopper amplifiers, the interaction between the input signal and the chopper clock can cause intermodulation distortion (IMD). This is due to amplifier delay, which causes signal transitions generated by the input chopper to arrive at the amplifier’s output slightly later than the corresponding clock transitions of the output chopper. This causes large signal-dependent spikes in the final output, which can significantly degrade amplifier linearity, especially at input frequencies near even multiples of the chopping frequency FCH, which will cause IMD tones near DC. In [2-4], spread-spectrum clocks are used to convert such tones into noise-like signals. However, this increases the noise floor, without solving the underlying problem. Recently, it has been shown that such spikes can be eliminated by using the fill-in technique [1], in which two identical OTAs are

👥 作者与机构

Thije Rooijers1,2, Johan H. Huijsing1, Kofi A. A. Makinwa1

Delft University of Technology, Delft, The Netherlands,