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Class AB output stage

 
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opamp741



Joined: 17 Jun 2004
Posts: 145
Helped: 10
Location: India
Post30 Jul 2004 11:26   Class AB output stage
Dear Frds,
please help me understanding following circuit.
It is a class AB stage that can be used as a output buffer stage in opamp.
But I am not sure how does it works and how to identify bias point for it.

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sunking



Joined: 25 May 2004
Posts: 914
Helped: 46
Post31 Jul 2004 14:58   Re: Class AB output stage
igore the body effecct, notice the Vgs of M5 M4 M2 M1,
you will get Vgs5+Vgs4=Vgs2+Vgs1.

so the bias current is bias by M3.
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avinash



Joined: 24 Jul 2004
Posts: 170
Helped: 10
Post03 Aug 2004 7:28   Re: Class AB output stage
just refer to book by allen and holberg on CMOS analog circuit design
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