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上期提出能否简化电路设计至仅用一块双运放实现折线比较的设计要求。因为实现斜线判断必须使用运放,实现U_G与折线的比较也离不开运放,因此实现折线所需的电压箝位能否在不用运放时方便而准确地实现成为电路设计的关键。为能方便地得到精确的基准电压,使用电位器对由稳压管或更精密的稳压基准芯片得到的基准电压进行分压即可得出所需电压值。但由于是电阻分压,这种基准电压源内阻大,带负载能力低,只能置于运放高阻抗输入端作比较基准用,而不能用作运
The last issue put forward to simplify the circuit design to only use a single dual opamp to achieve the design requirements of the broken line. Because to realize the slash judging must use the opamp, the realization U_G and the polyline comparison also can not do without the op amp, therefore achieves the polyline the required voltage clamp can not realize the circuit design conveniently when not using the opto-amp. In order to get an accurate reference voltage easily, a potentiometer is used to divide the reference voltage obtained from the regulator or a more precise regulator reference chip to obtain the desired voltage value. However, due to the resistance of the voltage divider, the internal resistance of such a reference voltage source with a low load capacity can only be placed at the op amp high impedance input for comparison purposes, but can not be used as a transport