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设计了一种具有高的直流增益的宽带线性全差分跨导运放.一方面,并联一个工作在线性区的场效应管来补偿直流三阶系数,得到了一种应用于连续时间滤波器、增加跨导器饱和区输入信号幅度的简单方法.另一方面,结合负电阻电路提高了输出阻抗,实现高的直流增益而不需要额外的内部结点,并减小了因有限直流增益和寄生电容引起的相位偏差.将此全差分跨导运放应用于0.18μmCMOS工艺二阶带通滤波器,在3.3V电源电压、输入峰峰值1V时,HSPICE仿真结果的总谐波失真小于40dB,中心频率为20MHz,3dB带宽为0.18MHz,即Q为110.
A wide linear linear differential transconductance amplifier with high DC gain is designed.On the one hand, a field-effect transistor operating in the linear region is connected in parallel to compensate the third-order DC coefficient and a continuous-time filter is obtained, A simple way to increase the amplitude of the input signal in the transconductance saturation region.On the other hand, the negative resistance circuit improves the output impedance, achieves high DC gain without the need for additional internal nodes and reduces the effects of the limited DC gain and parasitics Capacitance induced phase deviation.This full differential transconductance operational amplifier applied to 0.18μmCMOS process second-order band-pass filter, 3.3V power supply voltage, the input peak-to-peak 1V, HSPICE simulation results total harmonic distortion of less than 40dB, the center The frequency is 20MHz, 3dB bandwidth is 0.18MHz, namely Q is 110.