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精密的运算放大器输入保护二极管可对两个独立的模拟信号输入线起到钳位二极管的作用(图1).当信号幅度在钳位电平以内时,图中所示器件在25℃时漏电电流极低,仅为50fA到100fA.钳位电压V_1和-V_2接在该低压CMOS放大器的电源端上.只要V_1的电位高于-V_2,钳位电压可定在0和最大电源电压绝对值(12V)之间的任意电压上.将第8管脚接到第4管脚上,1、5及6号管脚不接.当V_1与-V_2人之间的电压为10V时,该放大器所需电流低于50μA,属此种线路条件下的典型电流.若第3管脚相对于第2管脚电压为正值的话,则典型的电源电流低于1μA.
The precision op amp input protection diode acts as a clamp diode for two separate analog input lines (Figure 1). When the signal amplitude is within the clamp level, the device shown in the figure leaks at 25 ° C The current is very low, only 50fA to 100fA. Clamping voltage V_1 and -V_2 connected to the power supply terminal of the low voltage CMOS amplifier. As long as the potential of V_1 is higher than-V2, the clamp voltage can be set at 0 and the absolute value of the maximum supply voltage (12V) between the arbitrary voltage on the 8th pin to the 4th pin, pin 1,5 and 6 not connected when V_1 and -V_2 voltage between 10V, the amplifier The typical current under these line conditions is less than 50μA, with a typical supply current less than 1μA if the third pin has a positive voltage relative to the second pin.