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以心电图(ECG)检测为应用背景,采用电流互抵技术和线性区晶体管偏置结构设计了一种超低跨导、高线性度的跨导运算放大器(OTA),其跨导达到了nA/V量级。在此基础上,根据信号传输函数搭建了一个4阶低通滤波器电路模型,其截止频率为250Hz,通带衰减为0.4dB,带内平均噪声为90.53μV(rms)·Hz-1/2,在ECG应用中拥有67dB的动态范围(THD≤1%)。使用Cadence Spectre软件进行仿真和调试,最后进行版图设计并流片。在不包括静电结构和压焊点的情况下,芯片版图面积为0.027mm2。电路供电电压为1.8V,具有很高的集成度,能应用于便携式ECG集成电路中。
Taking the ECG detection as the application background, an ultra-low transconductance and high linearity transconductance operational amplifier (OTA) is designed by adopting the current offset technology and the linear transistor bias structure, and the transconductance reaches nA / V magnitude. On this basis, a 4-order low-pass filter circuit model is built based on the signal transfer function with a cutoff frequency of 250 Hz, a passband attenuation of 0.4 dB and an average in-band noise of 90.53 μV (rms) · Hz-1/2 , 67dB dynamic range in ECG applications (THD ≤ 1%). Simulation and debugging using Cadence Specter software, final layout design and streaming. In the case of not including the electrostatic structure and the pad, the chip layout area is 0.027mm2. Circuit supply voltage of 1.8V, with a high degree of integration, can be used in portable ECG integrated circuits.