Original question:
The datasheet of INA310A3 states that the device has a PSRR of approximately 130 dB, but the latest PSPICE model simulation results show that the PSRR at low frequencies is only 77 dB, and the curve is also different from what is described in the datasheet. The same issue exists with the CMRR. Could this be an error in the PSPICE model?
我认为这个问题是、您不是将曲线参考到输入(RTI ="以输入为基准")。 PSRR 规格和曲线是 RTI、因此您必须获取任何输出曲线、然后将其除以增益与频率间的关系曲线。 这是用于实现该目的的 TINA 仿真。 ACM 是以输出为基准的电源抑制比。 ADM 是设备使用同一发生器源时的增益与频率之间的关系。 RTI PSRR 等于输出除以增益。 此外、ACM 可反转、因此 PSRR 曲线为正值、这是我们的标准。
