Subject: RE: [IBIS-Users] Positive Ground Clamp Curve
From: Muranyi, Arpad (arpad.muranyi@intel.com)
Date: Wed Mar 27 2002 - 09:07:56 PST
Tim,
Yes, there is. I usually do it this way:
Arpad
======================================================================
3-state I-V plot generator
**********************************************************************
* This is a I-V curve generator for input or 3-stated buffers.
* It runs in transient mode and shows the I-V curve in the same
* orientation as it is seen on a curve tracer.
**********************************************************************
.OPTIONS POST=1 PROBE
.PROBE TRAN Voltage=V(Sweep) Pulldown=I(Vsweep)
.TRAN 0.1ms 198ms
**********************************************************************
.param Vcc_DC=3.3
**********************************************************************
Vpow Vcc 0 DC=Vcc_DC
Vsweep 0 Sweep PWL 0ns 3.3V 198ms -6.6V
**********************************************************************
X1 0 Sweep Vcc 0 0 BUFFER_SUBCKT_NAME
* input output power GND enable
**********************************************************************
.END
**********************************************************************
-----Original Message-----
From: Timothy Coyle [mailto:Timothy.Coyle@nsc.com]
Sent: Wednesday, March 27, 2002 7:58 AM
To: ibis-users@server.eda.org
Subject: [IBIS-Users] Positive Ground Clamp Curve
I am trying to gain ground clamp curve data for an input buffer. I do a DC
sweep on the input pin and measure the current. However,
I get positive current. I am using HSPICE. Is there a current convention
thing going on in HSPICE or is something else wrong?
Thanks in advance for any info.
Tim
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