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How to measure input capacitance?

Holz

Hello everyone,

I create a symbol(as shown is following figure: CMOS) and use it in other circuits, can I measure the input capacitance of cin, when I set a_2 and b_2 to different value? And how ?

Thanks a lot for help!

Regards,

Holz

Parents

  • Dear Holz,

    I just answered this question basically in the post at URL:

    community.cadence.com/.../test-bench-for-plotting-negative-capacitance-of-cross-coupled-pair

    with an example test bench and expressions. You might take a look at this and see how the test bench can be include your subcircuit. You only need to set one of your inputs to ground and the other to the included voltage source to, for example, examine the input capacitance when one input is grounded and the other is set to a value of your choosing. In this fashion, you can sweep the variable voltage and determine input capacitance as a function of input voltage - which I am thinking you want to achieve.

    I hope this is helpful to you...

    Shawn

Reply

  • Dear Holz,

    I just answered this question basically in the post at URL:

    community.cadence.com/.../test-bench-for-plotting-negative-capacitance-of-cross-coupled-pair

    with an example test bench and expressions. You might take a look at this and see how the test bench can be include your subcircuit. You only need to set one of your inputs to ground and the other to the included voltage source to, for example, examine the input capacitance when one input is grounded and the other is set to a value of your choosing. In this fashion, you can sweep the variable voltage and determine input capacitance as a function of input voltage - which I am thinking you want to achieve.

    I hope this is helpful to you...

    Shawn

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