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PSTB + PSS Analysis for dc-dc converter feedback loop stability

EhsanAfshari

Hello Cadence community,

I'm a newbie for using Cadence Virtuoso simulation bench to study the loop stability of a dc-dc converter. My setup is a dc voltage fed into a Full-bridge inverter and then connected to a LC network and magnetic coil. The secondary side is connected to a rectifier. The feedback loop that I have senses the output dc voltage of the rectifier, compares it with a reference, and then feeds it back into a controller to adjust the duty cycle of the full-bridge inverter, such that the rectifier voltage can remain at the reference value. 

I would like to plot the loop gain of this controller. I have a couple of questions:

1. Do I need to use both PSTB and PSS to obtain the loop gain amplitude and phase?

2. Do I need to use iProbe component to run the above mentioned analysis? 

Thanks,

Ehsan

  • Frank Wiedmann

    PSS is a prerequisite for PSTB, the iprobe is used to specify where in the circuit the loop gain is calculated. You might want to take a look at https://support.cadence.com/apex/ArticleAttachmentPortal?id=a1O0V000007MoM1UAK 

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