Wednesday 13 January 2016

What is capacitive loading? How does it affect slew rate?

By definition slew rate of a circuit is rate at which a circuit can charge and dischare 

capacitance. This capacitance may be external capacitor CL or  Cg gate 

capacitances of transistors connected to this circuit.  

Normally a digital circuit during switching must charge or discharge  CL or Cg at 

faster rate, and this charging rate depends on output current of the circuit.  

capacitive loading occurs when this output current is insufficient to drive load 

capacitances CL and one or more gates connected to original circuit as a result slew 

rate of the circuit decreases and circuit becomes slow(takes more time to charge 

capacitors connected to circuit).

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