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Folded cascode OPAMP with CLASS-AB o/p Stage


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rampat



Joined: 27 Jun 2007
Posts: 83
Helped: 1
Location: bangalore


Post21 Aug 2007 7:02   

Folded cascode OPAMP with CLASS-AB o/p Stage


Has anyone wrked on the following architecture ? Cud u please tell the design approach for this..And also how to take care of THD in this design..
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ambreesh



Joined: 21 Feb 2005
Posts: 369
Helped: 21


Post27 Aug 2007 15:41   

Re: Folded cascode OPAMP with CLASS-AB o/p Stage


Have not designed something like this.
But trick would be get the floating current source right wayLast string is the ouput stage as we all can see, The once before it are for biasing of the floating current source in the output of folded cascode.
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Alan_Nesta



Joined: 11 Aug 2005
Posts: 103
Helped: 5


Post29 Aug 2007 7:09   

Folded cascode OPAMP with CLASS-AB o/p Stage


This is a classAB OP with floating-current mirror.
You can get help from JSSC Dec. 1994 Hogervorst's paper.
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songjunjian



Joined: 02 Aug 2007
Posts: 26
Helped: 3


Post29 Aug 2007 7:25   

Re: Folded cascode OPAMP with CLASS-AB o/p Stage


you can increase the openloop gain of the opa, which can increase the thd, please take care of the impedence of float current source, the impedence will increase as the frequence increase. you can add a capacitor between the float current source.
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