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在自动控制和航空航天等技术领域内,经常需要对来自传感器的直流信号(典型值为0～±10毫伏)进行放大变换,以便为推动继电器去执行电路的开闭创造条件。通常的继电器难以达到这样高的灵敏度,而采用集成运放作为敏感变换器,则将从根本上改善继电器的灵敏度,从而大大开拓了继电器的应用范畴。 一个开状状态的线性集成运算放大器,其输出电压总是稳定于某一输出饱和电压。例如稳定在+Vomax或-Vomax。通过运放的高开环增益,同时再对它施加某种适量的正反馈,使得运放能在很微小的输入控制信号情况下,接近阶跃地实现输出电平的转换。例如:对输出电平为
In the fields of automation and aerospace, it is often necessary to amplify the DC signal (typically 0 to ± 10 millivolts) from the sensor in order to create the conditions for pushing the relay to open and close the circuit. The relay is usually difficult to achieve such a high sensitivity, and the use of integrated op amp as a sensitive converter, it will fundamentally improve the sensitivity of the relay, which greatly opened up the relay applications. A open state linear integrated operational amplifier, the output voltage is always stable at a certain output saturation voltage. For example stable at + Vomax or -Vomax. Through the high open-loop gain of the op-amp, while applying a certain amount of positive feedback to it at the same time, the op amp can achieve the transition of the output level close to the step with a very small input control signal. For example: the output level is