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Stability Analysis

shivamm

I am designing a system with feedback and the system oscillates when I do a transient analysis. All the individual blocks(A1 through A5) are stable when tested individually. RC1 and RC2 are just resistor-capacitor networks. 

I tried using the stb analysis tool, however, that requires positioning of the probe such that all the loops are broken which is not possible in my case. Is there any other way to test it?

Is there a way to find/plot the phase and gain(output vs input) of each block in the system? If so, what is the tool?

 Thanks in advance.  

Parents

  • stb analysis allows you to look at the loop gain of a specific loop - there's nothing to stop you doing the analysis on several loops (note, you're not "breaking" the loop - you're measuring the loop gain at a specific point). So looking at the output of the final stage would be reasonable (to start with).

    You can also use pz analysis to look at the overall poles and zeros of the circuit - and so you can then see if the circuit has any right hand plane poles.

    Andrew

Reply

  • stb analysis allows you to look at the loop gain of a specific loop - there's nothing to stop you doing the analysis on several loops (note, you're not "breaking" the loop - you're measuring the loop gain at a specific point). So looking at the output of the final stage would be reasonable (to start with).

    You can also use pz analysis to look at the overall poles and zeros of the circuit - and so you can then see if the circuit has any right hand plane poles.

    Andrew

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