Limiting circuit
Figure X is a limiter circuit. When there is no signal input at the input terminal, the output voltage is zero because the diode D is connected in reverse. When there is a pulse signal input, if the amplitude of this pulse is enough for the voltage source E, D is turned on, so that the circuit limits the maximum value of the output pulse to E + 0.6 (0.6 is the forward voltage drop of D), also That is, E + 0.6 is the threshold voltage of this limiter.
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