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Hysteresis sweep option in DC

sohaiba

Hi,

I haven't been able to see a Hysteresis plot by using the DC Hysteresis sweep option. I have also enabled the 'DC operating point' option as well. I was expecting to find a negative going plot as well for the device but there is only a single Voltage transfer characteristic curve.

 Following are the settings the Cadence spectre.out shows.

Important parameter values:
    reltol = 1e-03
    abstol(V) = 1 uV
    abstol(I) = 1 pA
    temp = 120 C
    tnom = 27 C
    tempeffects = all
    gmindc = 1 pS
    hysteresis = on

Which verifies that hysteresis option is "ON".  I am using MMSIM 11.1 and Cadence 6.1.5. Could you indicate where I could be going wrong?

Regards

 

 

Parents
  • Andrew Beckett

    I checked in MMSIM14.1 ISR17 with your circuit. I added a transient analysis too - I changed V4 to:

    V4 (VP 0) vsource dc=vdc type=pulse val0=0 val1=1.2 rise=1m period=2m width=0 delay=0

    and added:

    dc dc hysteresis=yes param=vdc start=0.5 stop=0.7 lin=200 \
    maxiters=150 maxsteps=10000 annotate=status
    tran tran stop=2m

    (the dc is narrower - I removed the oppoint just in case but I don't think that's critical). Here's what I got:

    If I really zoom in you can see there's a tiny amount of hysteresis. From the transient slow ramp up and down of VP, there appears to be no significant hysteresis in the circuit (the transition is almost exactly at 0.6V for rise and fall ramp).

    So are you sure your circuit actually exhibits hysteresis?

    BTW, I just re-tested in 13.1.1.049 and see identical results to the above picture.

    Regards,

    Andrew.

Reply
  • Andrew Beckett

    I checked in MMSIM14.1 ISR17 with your circuit. I added a transient analysis too - I changed V4 to:

    V4 (VP 0) vsource dc=vdc type=pulse val0=0 val1=1.2 rise=1m period=2m width=0 delay=0

    and added:

    dc dc hysteresis=yes param=vdc start=0.5 stop=0.7 lin=200 \
    maxiters=150 maxsteps=10000 annotate=status
    tran tran stop=2m

    (the dc is narrower - I removed the oppoint just in case but I don't think that's critical). Here's what I got:

    If I really zoom in you can see there's a tiny amount of hysteresis. From the transient slow ramp up and down of VP, there appears to be no significant hysteresis in the circuit (the transition is almost exactly at 0.6V for rise and fall ramp).

    So are you sure your circuit actually exhibits hysteresis?

    BTW, I just re-tested in 13.1.1.049 and see identical results to the above picture.

    Regards,

    Andrew.

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