Continue to Site

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.

Register Log in

Stability analysis of Multi-loop circuit

Status
Not open for further replies.
leo_o2

leo_o2

Advanced Member level 4
Joined
Sep 3, 2004
Messages
1,322
Helped
278
Reputation
558
Reaction score
241
Trophy points
1,343
Location
China
Activity points
5,761
Hi,

Anyone can provide theory for stability analysis of Multi-loop circuit.
If there are more than one feedback loop, how to break the loop for AC simulation?
 

If every loop in the system is stable the whole system is stable also. This is sufficient condition for a system stability. I think you can read any text book about automatic control theory. I know some books but in russian only. I can suggest to you, if you need :)
 

    leo_o2

    leo_o2

    Points: 2
    Helpful Answer Positive Rating
How to do AC simulation in spectre or hspice? Break every place?
 

no you do not need to break at every place. Check for individual loop stability first and then for the outer loop.

In spectre go for stb analysis this will give better results and if are using hspice then try using middlebrook's method(u need t write some subcircuit for double injection etc) or in the simplest but less accurate way just use an inductor and capacitor. the value of L and C has to HUGE so that the double pole falls in rane of millihertz.

hope this helps u.
 
Any other suggestions?
 

I think that suggestion of 'ashish_chauhan' is right.
Solve the internal loop first then outer loop....
 

Status
Not open for further replies.

Similar threads

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Back
Top