In this paper, we have proposed a highly linear Operational Transconductance Amplifier (OTA) with wide linear input range. The proposed OTA utilizes conventional source degeneration with an auxiliary differential pair which increases the linear range significantly by reducing the distortion components. The proposed OTA is targeted for current mode circuit applications including low-frequency continuous time filters. A second-order fully differential filter architecture is also implemented by using this proposed OTA. The linear OTA and the filter are implemented in SCL 180 nm CMOS process technology with 1.8 V supply voltage. The proposed OTA achieves third order harmonic distortion (\({\textit{HD}}_3\)) of \(-\,74.3\) dB, inter modulation distortion (\({\textit{IM}}_3\)) of \(-\,75.5\) dB for \(600\,\hbox{mV}_{p-p}\) differential input with 1 MHz signal frequency and a linear range of 0.9 V for 1% transconductance variation. The filter is designed for 100 kHz cutoff frequency and achieves \({\textit{HD}}_3\) of \(-\,68.75\) dB and \({\textit{IM}}_3\) of \(-\,64.3\) dB for \(300\,\hbox{mV}_{p-p}\), 10 kHz input signal.

在本文中，我们提出了具有宽线性输入范围的高线性运算跨导放大器（OTA）。提出的OTA利用传统的源极退化和辅助差分对，通过减少失真分量来显着增加线性范围。拟议的OTA面向包括低频连续时间滤波器的电流模式电路应用。通过使用此建议的OTA，还可以实现二阶全差分滤波器架构。线性OTA和滤波器采用SCL 180 nm CMOS工艺技术，电源电压为1.8V。拟议的OTA实现了\（-，74.3 \）  dB的三阶谐波失真（\（{\ textit {HD}} _ 3 \），互调失真（\（{\ textit {IM}} _ 3 \）） 对于\（600 \，\ hbox {mV} _ {pp} \）差分输入具有\（-\，75.5 \） dB ），信号频率为1 MHz，跨度变化为1％时线性范围为0.9 V. 该过滤器被设计为100千赫的截止频率，并实现\（{\ textit {HD}} _ 3 \）的\（ - \，68.75 \）  dB和\（{\ textit {IM}} _ 3 \）的\（ - \ （300 \，\ hbox {mV} _ {pp} \）的\，64.3 \）  dB ，10 kHz输入信号。