Differentiator
（重定向自Differentiator circuit）
![Figure 1: Capacitive Differentiator](/Images/godic/202501/09/Passive_differentiator_circuit_14457.png")
![Figure 2: Inductive Differentiator](/Images/godic/202501/09/Passive_differentiator_circuit_24457.png")
![Figure 3: Amplitude and phase transfer functions for a passive differentiator circuit](/Images/godic/202501/09/Passive_differentiator_circuit_transfer_function4457.png")
![Figure 4: An impulse response of a passive differentiator circuit](/Images/godic/202501/09/Passive_differentiator_circuit_impulse_response_14457.png")
In electronics, a differentiator is a circuit that is designed such that the output of the circuit is approximately directly proportional to the rate of change (the time derivative) of the input. An active differentiator includes some form of amplifier. A passive differentiator circuit is made of only resistors and capacitors.