A new solution for a low-voltage multiple-input dynamic threshold operational transconductance amplifier (MIDT OTA) for low-frequency signal processing applications is presented. The differential pairs of the proposed OTA combine, for the first time, the multiple-input MOS technique along with the dynamic threshold voltage MOS to achieve a very simple and power-efficient CMOS structure with increased total transconductance. Further, the proposed MIDT OTA has been used to realize a fifth-order low-pass filter (LP) and a sixth-order band-pass filter (BP) using coupled-biquads. The proposed OTA and the filter applications are supplied with 0.5 V and consume 5 nW and 25 nW, respectively. The input band pass filter noise is 82.76 µV, while the dynamic range is 59.5 dB for the third intermodulation distortion (IMD) of 2%. The proposed circuits were designed in a 0.18 µm TSMC technology, and validated by simulations using Cadence platform.

提出了一种用于低频信号处理应用的低压多输入动态阈值运算跨导放大器（MIDT OTA）的新解决方案。拟议中的OTA的差分对首次将多输入MOS技术与动态阈值电压MOS结合在一起，从而实现了一种非常简单且具有高功率效率的CMOS结构，并具有增加的总跨导。此外，提出的MIDT OTA已被用于使用耦合双二阶来实现五阶低通滤波器（LP）和六阶带通滤波器（BP）。拟议的OTA和滤波器应用提供0.5 V电源，分别消耗5 nW和25 nW。输入带通滤波器的噪声为82.76 µV，而第三互调失真（IMD）为2％时，动态范围为59.5 dB。