[SI-LIST] Hspice Network Analysis
- From: Bill.Cohen@xxxxxxxxxxxxxxxx
- To: si-list@xxxxxxxxxxxxx
- Date: Wed, 12 Nov 2003 15:54:14 -0500
I have been analyzing on chip decoupling capacitors using hspice. I have
extracted the capacitance of the decoupling capacitor using transient
analysis. I ramped a voltage (slow Ramp 1ms) and looked for the current. I
found the capacitance using the formula
c=i*dt/dv
Using AC analysis I then curve fit an external resistance to mimic my
routing and transistor channel resistance using a reference ideal RC
circuit.
I then used the AC Network analysis package available in Hspice. I got good
correlation to the resistance but I have bad correlation between the
capacitance. Does anyone have experience with the Network analysis
available in Hspice? Why would the Network analysis capacitance number vary
widely from the transient analysis? I curve fit from 100K to 1Ghz and ran
the network analysis at the same frequencies.
Transient Analysis: C=18.6pF
AC curve fitting of R=2.8 ohms
Network analysis: R=2.86ohms, C=7.95pF.
--------------------------------------------------------------
| Bill Cohen
| Toshiba America Electronic Components
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