Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronics 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.

help! freq compensation

Status
Not open for further replies.

overmars

Member level 3
Joined
Sep 11, 2006
Messages
65
Helped
5
Reputation
10
Reaction score
1
Trophy points
1,288
Activity points
1,754
Hi!
I'm working on an three-stage op-amp design, the basic functionality structure has been established, but where shall I put compensation ckt to make this op-amp stable? After the simulation,I found there were many poles and zeros.
I just don't know where the dominant pole lies and which ckt point is the best place to add compensation ckt.
Please help me, thank you in advance!
 

rania_hassan

Advanced Member level 4
Joined
Apr 29, 2005
Messages
104
Helped
9
Reputation
18
Reaction score
1
Trophy points
1,298
Location
Egypt
Activity points
1,764
Hi,
First I'd like to know why you are using three stage Amplifier?
Could you get the gain value you want with two stage only as it's easier in stability calculation?
Second you can see the "Design of Analog Integrated Circuits by Behzad Razavi
best regards,
Rania
 

overmars

Member level 3
Joined
Sep 11, 2006
Messages
65
Helped
5
Reputation
10
Reaction score
1
Trophy points
1,288
Activity points
1,754
Sorry, it's a two-stage op-amp.
I know some of this theory, but practically I don't know where usually those poles locates, so that I could make related compensation ckt.
Regards!
 

rania_hassan

Advanced Member level 4
Joined
Apr 29, 2005
Messages
104
Helped
9
Reputation
18
Reaction score
1
Trophy points
1,298
Location
Egypt
Activity points
1,764
Hi, If you used two stage amplifier you can just single ended OTA followed by common source & used miller compensation
read about poles splitting in Razavi
best regards,
Rania
 

Status
Not open for further replies.

Similar threads

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Top