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circuit analysis

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parth22

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Hi all,
I have this PMOS circuit and would like to figure out this working.
I would like to know why the M1 is working while the Q5 is always on. As Q5 is always on, it will pull the source to Gate which should turn off the PMOS.

Am I getting this in the wrong way or something else?
Thanks.
 

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Why do you think that M1 is "working"? R6 charges the output without M1 turning on.

You can find out yourself by looking at circuit node voltages and branch currents, that's the purpose of a simulation.
 

Why do you think that M1 is "working"? R6 charges the output without M1 turning on.

You can find out yourself by looking at circuit node voltages and branch currents, that's the purpose of a simulation.
yes I check. There is no current through M1. M1 is not conducting.

And I got it. R6 is charging C1 from Q5 base. It means to charge the C1 we don't need PMOS anymore.
Thanks.😊
 

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