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stb analysis of a fully diff amp

Laoud

Hi there,


I have designed a fairly standard fully differential amplifier, with a capacitive common mode feedback (the standard one with transistors). This amplifier will be connected in closed loop as an integrator, so I have a capacitor in the feedback. I want to check the stability of both differential and common mode loops by using the diffstbprobe. My question is where exactly do I have to insert this module and what I can probe with that? Do I have to insert another stb probe in the common-mode feedback loop?

Thanks

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  • Costas,

    If you really want to simulate it open loop, then really you need a different testbench. Normally the loop gain is similar to the open loop gain (although that of course depends on your feedback loop, which from what you said is changing the loop response).

    You could use the spt1switch/spt2switch etc components from analogLib which allow you to configure connectivity differently for different analyses - although not sure that's quite what you want either.

    Or you could use the same testbench and have two different config views (created with the hierarchy editor), and use the "Bind to open" capability to omit certain components in different simulations - you'd have two ADE states (or two ADE XL tests) to do this.

    Regards,

    Andrew.

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  • Costas,

    If you really want to simulate it open loop, then really you need a different testbench. Normally the loop gain is similar to the open loop gain (although that of course depends on your feedback loop, which from what you said is changing the loop response).

    You could use the spt1switch/spt2switch etc components from analogLib which allow you to configure connectivity differently for different analyses - although not sure that's quite what you want either.

    Or you could use the same testbench and have two different config views (created with the hierarchy editor), and use the "Bind to open" capability to omit certain components in different simulations - you'd have two ADE states (or two ADE XL tests) to do this.

    Regards,

    Andrew.

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