Hello Community,
Does anyone know how to set the baseline voltage of a B2912 device before / after a pulsed sweep?
So what do I mean... I'm using IC-Cap to model some RF transistors after a pulsed IV-curve measurement. The pulsing is necessary to get the proper IV-curves which may be distorted by self heating and charge accumulation. However, since most of the transistors are normally on, the control of the output voltage of a SMU is essential to prevent damage to the device. I can do the pulsed sweep using the IC-CAP software but at the beginning and the end, the output voltage returns to zero which means maximum current through the RF-semiconductor. I want to set the voltage before and after the pulsed sweep to lets say -1V which can be easily done by operating the B2912 device manually. But IC-CAP overwrites the initial source voltages of the SMU...
How can I solve this?
Thanks in advance,
IronLeaves
Hello IronLeaves,
In IC-CAP, after measurements, voltages are typically all set to 0V. For measurement/device safety, as you describe, it is recommended to achieve the safety for the device, by controlling the order in which bias to the device is applied. This can be done by adding the variables UNIT_ORDER_ON and UNIT_ORDER_OFF, and then defining them per the Unit
Name for the SMU's, for example:
UNIT_ORDER_ON SMU1,SMU2,SMU3
UNIT_ORDER_OFF SMU3,SMU2,SMU1
would result in bias from SMU1 being applied first, SMU2 second and SMU3 third, and then after the measurement is
complete, the biases would be turned off, e.g. set to 0 in the reverse order, as specified.
Hope this helps! Please feel free to contact eesof_support@keysight.com for further details + discussion.
Best regards
Else