Hi Everyone
I have designed simple P-Channel MOSFET Circuit!
it works well.
However, when low Source power is applied(1V), glitch occurs in the output signal.
I tried R,L,C component, But it didn't work
What can I do to get rid of this?

Circuit

Simulation Result


Thinks!

 

There are small capacitor inside the MOSFET. G-S, G-S and D-S. When you inject a signal on the Gate (when it has fast edges) some small part of the Gate signal passes through the G-D capacitor and appears on the Drain.

 

How do you know that the “glitch” would occur in a real circuit?
Glitches don’t normally undershoot before the start of a transition. They tend to overshoot at the end of the transition. It would appear to be an artefact in the simulation software.

 

In fact, this is part of a more complex circuit: Simulation of the actual circuit is shown below.

 

I think the glitch is normal.
You are using a 1V supply, and a 5V gate drive. That is part of the problem.
I am using 800V supply and a 15V gate drive. (real life not SPICE) and it is hard to see the glitch.
Just to probe my thoughts, try changing the Tr and Tf to 25nS, then try 100nS. Maybe 200nS. If the glitch is the gate signal passing through the MOSFET you will see the slower signal will have smaller glitches.

OR. Add a Gate resistor on the M40. 100 ohms will greatly reduce what you see. 10 ohms will help but not as much.

 

Why is the glitch in the opposite direction of the next transition?
Is this because of inductive back EMF?

 

I suspect inductive wiring. If the circuit is built with a mess of long wires all over the place on a breadboard then the voltage spikes will happen.

 

I suspect inductive wiring. If the circuit is built with a mess of long wires all over the place on a breadboard then the voltage spikes will happen.

Except this is the result of a circuit simulation.

 

These are the MOSFET parasitic gate charges that are a likely source of your observed "glitches".
A MOSFET with lower values for those would reduce their amplitude.

charges that are a