118 lines
3.6 KiB
SourcePawn
118 lines
3.6 KiB
SourcePawn
6.3inch 4 lossy lines LTRA model -- R load
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Ra 1 2 1K
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Rb 0 3 1K
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Rc 0 4 1K
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Rd 0 5 1K
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Re 6 0 1Meg
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Rf 7 0 1Meg
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Rg 8 0 1Meg
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Rh 9 0 1Meg
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*
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* Subcircuit test
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* test is a subcircuit that models a 4-conductor transmission line with
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* the following parameters: l=9e-09, c=2.9e-13, r=0.3, g=0,
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* inductive_coeff_of_coupling k=0.6, inter-line capacitance cm=3e-14,
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* length=6.3. Derived parameters are: lm=5.4e-09, ctot=3.5e-13.
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*
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* It is important to note that the model is a simplified one - the
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* following assumptions are made: 1. The self-inductance l, the
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* self-capacitance ctot (note: not c), the series resistance r and the
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* parallel capacitance g are the same for all lines, and 2. Each line
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* is coupled only to the two lines adjacent to it, with the same
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* coupling parameters cm and lm. The first assumption implies that edge
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* effects have to be neglected. The utility of these assumptions is
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* that they make the sL+R and sC+G matrices symmetric, tridiagonal and
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* Toeplitz, with useful consequences (see "Efficient Transient
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* Simulation of Lossy Interconnect", by J.S. Roychowdhury and
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* D.O Pederson, Proc. DAC 91).
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* It may be noted that a symmetric two-conductor line is
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* represented accurately by this model.
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* Subckt node convention:
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*
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* |--------------------------|
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* 1-----| |-----n+1
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* 2-----| |-----n+2
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* : | n-wire multiconductor | :
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* : | line | :
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* n-1-----|(node 0=common gnd plane) |-----2n-1
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* n-----| |-----2n
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* |--------------------------|
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* Lossy line models
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.model mod1_test ltra rel=1.2 nocontrol r=0.3 l=2.62616456193e-10 g=0 c=3.98541019688e-13 len=6.3
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.model mod2_test ltra rel=1.2 nocontrol r=0.3 l=5.662616446e-09 g=0 c=3.68541019744e-13 len=6.3
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.model mod3_test ltra rel=1.2 nocontrol r=0.3 l=1.23373835171e-08 g=0 c=3.3145898046e-13 len=6.3
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.model mod4_test ltra rel=1.2 nocontrol r=0.3 l=1.7737383521e-08 g=0 c=3.01458980439e-13 len=6.3
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* subcircuit m_test - modal transformation network for test
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.subckt m_test 1 2 3 4 5 6 7 8
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v1 9 0 0v
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v2 10 0 0v
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v3 11 0 0v
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v4 12 0 0v
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f1 0 5 v1 0.371748033738
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f2 0 5 v2 -0.601500954587
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f3 0 5 v3 0.601500954587
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f4 0 5 v4 -0.371748036544
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f5 0 6 v1 0.60150095443
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f6 0 6 v2 -0.371748035044
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f7 0 6 v3 -0.371748030937
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f8 0 6 v4 0.601500957402
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f9 0 7 v1 0.601500954079
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f10 0 7 v2 0.37174803072
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f11 0 7 v3 -0.371748038935
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f12 0 7 v4 -0.601500955482
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f13 0 8 v1 0.371748035626
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f14 0 8 v2 0.601500956073
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f15 0 8 v3 0.601500954504
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f16 0 8 v4 0.371748032386
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e1 13 9 5 0 0.371748033909
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e2 14 13 6 0 0.601500954587
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e3 15 14 7 0 0.601500955639
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e4 1 15 8 0 0.371748036664
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e5 16 10 5 0 -0.60150095443
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e6 17 16 6 0 -0.371748035843
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e7 18 17 7 0 0.371748032386
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e8 2 18 8 0 0.601500957319
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e9 19 11 5 0 0.601500955131
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e10 20 19 6 0 -0.371748032169
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e11 21 20 7 0 -0.371748037896
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e12 3 21 8 0 0.601500954513
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e13 22 12 5 0 -0.371748035746
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e14 23 22 6 0 0.60150095599
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e15 24 23 7 0 -0.601500953534
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e16 4 24 8 0 0.371748029317
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.ends m_test
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* Subckt test
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.subckt test 1 2 3 4 5 6 7 8
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x1 1 2 3 4 9 10 11 12 m_test
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o1 9 0 13 0 mod1_test
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o2 10 0 14 0 mod2_test
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o3 11 0 15 0 mod3_test
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o4 12 0 16 0 mod4_test
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x2 5 6 7 8 13 14 15 16 m_test
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.ends test
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*
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x1 2 3 4 5 6 7 8 9 test
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*
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*
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VS1 1 0 PWL(15.9NS 0.0 16.1Ns 5.0 31.9Ns 5.0 32.1Ns 0.0)
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.control
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option noinit
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TRAN 0.2NS 50NS
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rusage
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*set color0=white
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set xbrushwidth=3
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plot v(1) v(2) v(6) v(7) v(8) v(9)
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.endc
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*
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.END
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