Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronic Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

Register Log in

Folded cascode OPAMP with CLASS-AB o/p Stage

Status
Not open for further replies.

rampat

Member level 4
Joined
Jun 27, 2007
Messages
69
Helped
3
Reputation
6
Reaction score
1
Trophy points
1,288
Location
bangalore
Activity points
1,756
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..
 

ambreesh

Full Member level 5
Joined
Feb 21, 2005
Messages
319
Helped
21
Reputation
42
Reaction score
4
Trophy points
1,298
Activity points
4,347
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.
 

Alan_Nesta

Member level 5
Joined
Aug 11, 2005
Messages
81
Helped
5
Reputation
10
Reaction score
0
Trophy points
1,286
Activity points
1,708
This is a classAB OP with floating-current mirror.
You can get help from JSSC Dec. 1994 Hogervorst's paper.
 

songjunjian

Junior Member level 2
Joined
Aug 2, 2007
Messages
24
Helped
2
Reputation
4
Reaction score
0
Trophy points
1,281
Activity points
1,381
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.
 

Status
Not open for further replies.
Toggle Sidebar

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Top