Transistor switching circuit with shortened response time

摘要

The response time of an ordinary or differential transistor switching circuit controlled by the charging of a capacitor C1 is shortened by charging the capacitor through a constant current source comprising a transistor Q6, a resistor R1 and diodes D1, D2, to thereby provide a sharp transfer characteristic. The charging time may be even further shortened by increasing the constant current supply at an intermediate threshold level using a further ordinary or differential transistor switching circuit, thereby providing a break in the response characteristic and increasing its slope after the threshold point.