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VCCAP Usage and Documentation

EEE student

Hi Guys, I have a question about vccap in the analogue lib.

I need to simulate a design with a varying capacitor and hence use a vccap is a good choice.

However, I don't quite know how to use it and the documentation about it is a bit unclear.

May I kindly ask if anyone has ever used it before? If you don't recommend using it, may I ask if there are other possible ways of varying caps in simulation?

Thank you very much!

Mingqiang

Parents

  • This is implemented with spectre's "vccs" component, so you can find out more by typing "spectre -h vccs" in a terminal window.

    As a simple example, if you have the controlling pairs set to 2, and controlling volt 1 as 0, and controlling volt 2 as 1, with Corresp Element 1 as 1p, and Corresp Element 2 as 5p - then the controlling voltage inputs will effectively switch between a 1p capacitor and a 5p capacitor depending on whether the input is 0V or 1V. How smooth the transition is between cap values is dependent upon Delta (which can be between 0 and 0.5). You can also scale the capacitor value using the Scale factor parameter. You can have more controlling pairs to model a different transfer function between the controlling voltage and chosen capacitor value.

    I did notice that it doesn't do a fantastic job of timestep control so use with caution.

    Regards,

    Andrew

  • in reply to Andrew Beckett

    Hi Andrew,

    Nice to meet you again! Thank you for your help, but I am still confused about the detailed operation. 

    Shall I use the vccs and change its type as vccap or shall I just directly use vccap? It looks like the document in terminal is all about vccs and it indeed can be treated as vccap. But then what is the function of the vccap? It does not have any parameters. Is vccap just a symbol and the substantial part is vccs?

    Thanks!

    Mingqiang

Reply
  • in reply to Andrew Beckett

    Hi Andrew,

    Nice to meet you again! Thank you for your help, but I am still confused about the detailed operation. 

    Shall I use the vccs and change its type as vccap or shall I just directly use vccap? It looks like the document in terminal is all about vccs and it indeed can be treated as vccap. But then what is the function of the vccap? It does not have any parameters. Is vccap just a symbol and the substantial part is vccs?

    Thanks!

    Mingqiang

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