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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

Parents

  • Thanks Andrew for your prompt response. I have tried diffstbprobe and it works fine. I have also placed the iprobe in the CMFB loop and checked the stability. Though, I am trying to find a way of checking the open loop gain-phase response of the amplifier from the same testbench. Any ideas?

    Kind Regards,


    Costas

Reply

  • Thanks Andrew for your prompt response. I have tried diffstbprobe and it works fine. I have also placed the iprobe in the CMFB loop and checked the stability. Though, I am trying to find a way of checking the open loop gain-phase response of the amplifier from the same testbench. Any ideas?

    Kind Regards,


    Costas

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