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TS3A27518E-Q1: S parameters behavior

Matth. B.
Expert 1145 points
Part Number: TS3A27518E-Q1
Other Parts Discussed in Thread: TS3A27518E, TMUX1574

Hello,

I need to make some simulations with a TS3A27518E using S parameters. I dowloaded them in this post https://e2e.ti.com/support/switches-multiplexers-group/switches-multiplexers/f/switches-multiplexers-forum/612734/ts3a27518e-s-parameters-for-ts3a27518e but I have some issues in use.

It seems that there is a ot of causality issue and at least one passivity issue (red points on image below):

I have tried to enfore both but result is not right (see step response below):

Is it possible to send me S parameters without causality and passivity violations in order to use them in my transient simulation?

I tried also with S parameters from TMUX1574 and all is OK in this case.

Thanks

  • 0
    TI__Mastermind 35378 points

    Hey Matthieu,

    This device is a bit older so I don't have any s-parameter models on hand but I'm going to talk to our internally on this and see if we can provide some simulated s-parameter models that can help you here. I'll update you by tomorrow on the timeline here.

    Thanks,
    Rami

  • 0
    TI__Mastermind 35378 points

    Hey Matthieu,

    Please see the s-parameter model below

    https://e2e.ti.com/cfs-file/__key/communityserver-discussions-components-files/388/TS3A27518E.s4p

    The ports are as follows : 

    P1 : D1
    P2 : D2
    P3 : S1
    P4 : S2

    Thanks,
    Rami

  • 0 in reply to Rami Mooti1
    Expert 1145 points

    Hey Rami,

    Thanks. The file seems OK now but I have only a connection between port 1 and 3. In order to be sure D is for drain and S for source of the internal MOSFET?

    Could you say me which pin of the component is connected to the port (COM, NC or NO).

    Thanks

    Matthieu

  • +1 in reply to Matth. B.
    TI__Mastermind 35378 points

    Hey Matthieu,

    Sorry, I don't think I was so clear there. Yes, D is drain and S is source. The S1 and S2 represent the NC/NO paths. S1 is NC1 here, S2 is NO1 and should be connected to the drain. D1 is the drain associated with the channel (COM1). D2 is the drain associated with a different channel (COM2).

    Thanks,
    Rami