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pss+pstb simulation of boost converter when it is unstable

midaslab

Hello, now I am designing current mode boost converter.

So i did schematic the circuit blocks i need, and  then i ran transient simulation to see the output voltage.

But it seems like oscillation at compensator input and output, when the compensator output (the control voltage) start to go to  adequate voltage (maybe?)

I heard about the stability simulation about PSS and PSTB

But in PSS, there is  blank, the Additional time for stabilization.

In my case i can't define that time because my circuit is unstable.

In this situation, how to run the PSS and PSTB  simulation??

  • ShawnLogan

    Dear midaslab,

    midaslab said:

    I heard about the stability simulation about PSS and PSTB

    But in PSS, there is  blank, the Additional time for stabilization.

    In my case i can't define that time because my circuit is unstable.

    In this situation, how to run the PSS and PSTB  simulation??

    All oscillators are unstable. In fact, if an oscillator becomes stable, it will no longer possess a periodic solution. The term "Additional time for stabilization" or "tstab" refers to an estimate of the simulation time required for its output waveform to achieve a near steady-state solution. Higher Q based resonant circuits will require longer time period to approach their steady-state solution than lower Q based resonant circuits. the Cadence periodic steady-state simulator (pss) starts to compute an estimate of the steady-state solution starting with the transient simulation result after the specified "tstab" has been achieved. A value for "tstab" does not have to be entered as the Cadence pss analysis can estimate a value for "tstab" by checking the "decide automatically" radio button shown in the pss analysis GUI shown in Figure 1.

    Shawn

    Figure 1

  • midaslab
    in reply to ShawnLogan

    Thank you so much for your reply ! 

    As you advised, i tried to find "decide automatically" 

    I think my virtuoso version doesn't has that content.

    In that case, how can i do similar thing that you advised ? 

    My pss GUI are shown in Fig. 1

    Fig. 1

  • Andrew Beckett
    in reply to midaslab

    My guess is that you're using a very old version of Virtuoso. What does it show when you do Help->About in any of the windows? (please give the full version).

    Andrew

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