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Spice decks | |
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Further information
Each cell has a Spice deck
The schematic spice deck uses estimates for the diffusion areas and perimeters and has no fixed parasitic capacitances. Parallel transistors are merged together. The Alliance extracted spice deck also uses an estimate for the diffusion areas and perimeters, and the fixed parasitic capacitance only considers area and not sidewall. All capacitances are lumped to ground. The transistor length is the value that will appear in the CIF file, which for this technology is different to the one that should appear in the spice deck (0.12µm instead of 0.13µm).
The spice deck extracted from Magic also has limitations which means that lambda values for the transistors have to be extracted and a scaling has to be applied during Spice simulation. This is done with a .OPTIONS card:
.OPTIONS scale=0.055 |
Resistance should be extracted and this should be possible with Magic but I have not succeeded so far.
The fixed parasitic capacitances extracted by Alliance and Magic can be compared by lumping them all to ground.
a b z n1
Magic 0.344 0.301 0.506 0.611
Alliance 0.468 0.438 0.821 0.487 |
Example of Spice deck written from Xcircuit and modified by a script to enclose the transistors in a subcircuit. The P transistor width is 40λ which becomes 2.2µm when multiplied by λ=0.055µm.
* Sat Mar 31 18:48:37 CEST 2007 .subckt nd2v5x3 a b vdd vss z *SPICE circuit |
Example of Spice deck extracted from Alliance. Note the incorrect channel length.
* Spice description of nd2v5x3 * Spice driver version 134999461 * Date 17/05/2007 at 9:21:02 * vsclib 0.13um values .subckt nd2v5x3 a b vdd vss z M01 vdd a z vdd p L=0.12U W=1.1U AS=0.2915P AD=0.2915P PS=2.73U PD=2.73U M02 z b vdd vdd p L=0.12U W=1.1U AS=0.2915P AD=0.2915P PS=2.73U PD=2.73U M03 z b n1 vss n L=0.12U W=0.715U AS=0.189475P AD=0.189475P PS=1.96U PD=1.96U M04 n1 a vss vss n L=0.12U W=0.715U AS=0.189475P AD=0.189475P PS=1.96U PD=1.96U M05 z a vdd vdd p L=0.12U W=1.1U AS=0.2915P AD=0.2915P PS=2.73U PD=2.73U M06 vdd b z vdd p L=0.12U W=1.1U AS=0.2915P AD=0.2915P PS=2.73U PD=2.73U M07 n1 b z vss n L=0.12U W=0.715U AS=0.189475P AD=0.189475P PS=1.96U PD=1.96U M08 vss a n1 vss n L=0.12U W=0.715U AS=0.189475P AD=0.189475P PS=1.96U PD=1.96U C5 a vss 0.468f C4 b vss 0.438f C1 n1 vss 0.487f C2 z vss 0.821f .ends |
Example of Spice deck extracted from Magic after modification by a script. The channel length of 2.3636µm is multiplied by λ=0.055 to give the simulated value of 0.13µm.
.subckt nd2v5x3 a b vdd vss z * SPICE3 file created from nd2v5x3.ext - technology: scmos m00 z b vdd vdd p w=20u l=2.3636u ad=80p pd=28u as=120p ps=42u m01 vdd b z vdd p w=20u l=2.3636u ad=120p pd=42u as=80p ps=28u m02 z a vdd vdd p w=20u l=2.3636u ad=80p pd=28u as=120p ps=42u m03 vdd a z vdd p w=20u l=2.3636u ad=120p pd=42u as=80p ps=28u m04 z b n1 vss n w=13u l=2.3636u ad=52p pd=21u as=64.5p ps=30.5u m05 n1 b z vss n w=13u l=2.3636u ad=64.5p pd=30.5u as=52p ps=21u m06 vss a n1 vss n w=13u l=2.3636u ad=52p pd=21u as=64.5p ps=30.5u m07 n1 a vss vss n w=13u l=2.3636u ad=64.5p pd=30.5u as=52p ps=21u C0 n1 z 0.135f C1 vss a 0.025f C2 n1 b 0.033f C3 z a 0.056f C5 a b 0.089f C6 z vdd 0.187f C7 b vdd 0.020f C8 vss z 0.035f C9 n1 a 0.109f C10 vss b 0.025f C11 z b 0.089f C12 n1 vdd 0.029f C13 a vdd 0.031f C14 vss n1 0.295f C16 z vss 0.004f C17 a vss 0.034f C18 b vss 0.045f .ends |