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Smooth dynamic parameter variation in transient sim

Quantum7

In a transient sim we know we can put any PWL source and if we define t1 and t2 with their corresponding values, during a sim there will be linear transition of the voltage source between that time.

if someone wants to vary the dynamic parameter (say a temperature), he can enter the temp values vs time stamps, in other words it will have to be done in discrete steps; but now, my question is, is there a way to vary some dynamic parameter in a smooth way, say if you define 27C at 1ms and 100C at 10ms, then temperature linearly rises during transient sim from 27C to 100C, rather than defining discrete steps. is there a way to achieve this?

Parents

  • There's no way to do it completely linearly, but you can do it in small discrete steps without having to define all the individual steps by using the param_step parameter (see "spectre -h tran") which can be specified via the Additional Arguments field on the Transient Options form (misc tab, I think). The idea is that if you have one value at 10u and another and 50u, and set param_step=1u, it would make 1/40th of the overall step each 1u.

    Regards,

    Andrew.

Reply

  • There's no way to do it completely linearly, but you can do it in small discrete steps without having to define all the individual steps by using the param_step parameter (see "spectre -h tran") which can be specified via the Additional Arguments field on the Transient Options form (misc tab, I think). The idea is that if you have one value at 10u and another and 50u, and set param_step=1u, it would make 1/40th of the overall step each 1u.

    Regards,

    Andrew.

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