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How can I create this switch at cadence virtuoso?

yysunj

I want to create a switch like Figure 1.

                                                   (Figure 1. I want to create a switch like this switch.)

I think if I use sp3tswitch, I can create a switch like Figure 1.

But, I still do not know how to do it in detail.

Please tell me how can I create a switch like this switch using sp3tswitch.

Thank you 

yysunj

  • This is not really what sp3tswitch is for. That's intended to be a switch that can be in different positions in different analyses - and it doesn't offer the ability to change the switch position versus time. There's a way it could be done (by taking a copy, modifying the CDF, and then using dynamic parameters to change a parameter assigned to the switch position). However, that approach is a bad idea because the switch would change instantaneously which would potentially lead to a convergence difficulty.

    I was initially thinking that you'd use the "switch" component in analogLib which is a two-way switch - you could chain the together to give you multi-way switches. It's a voltage-controlled switch (using a "relay" in spectre).

    Then I wondered about the "multiplexer" in ahdlLib which is a Verilog-A model for a three-way multiplexer. However, it's the wrong way around for your needs, and the output is a copy of the input rather than electrically connected. A Verilog-A model would allow you to do what you want though.

    There are also some switch models which can be found here: https://designers-guide.org/verilog-ams/index.html 

    Andrew.

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