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Using XPS for ADC transient simulation

rsashwinkumar

Hi,

I am trying to run a transient simulation of a discrete time delta-sigma ADC. Normally with APS enabled, the simulation runs for a couple of hours. I wanted to try the new XPS hoping that it might reduce the simulation time. The command I used to run it is :

spectre -64 input.scs +escchars +log ../psf/spectre.out -format psfxl -raw ../psf    +xps +mt=8 +lqtimeout 900 -maxw 5 -maxn 5

This showed an error saying that the "cktpreset must be set either to flash or sram".

Since I am not trying to simulate memories but running a strobed transient, I tried to give cktpreset=sampled which threw an error saying unrecognized cktpreset value.

I went ahead and gave "cktpreset=flash" but it was taking a lot more time than it would take with APS; the same happened with the value set to sram.

I want to know the right way to run the simulation with XPS  to see an improvement in the simulation speed. I use MMSIM141 & Virtuoso-6.1.6.

  • Andrew Beckett

    Pure XPS is not appropriate for this type of circuit (yet). You should use "ms" mode (spectre +ms rather than spectre +xps). Please read up on this because you may need to give some clues to the simulator about any digital partitions if the simulator doesn't identify them itself.

    XPS-MS (which is what this is) is a hybrid of APS and XPS, with XPS being used for the digital portions, and APS for the analog.

    Regards,

    Andrew.

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