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Diffstat (limited to 'Windows/spice/examples/TransmissionLines/ltra7_4_line.sp')
| -rw-r--r-- | Windows/spice/examples/TransmissionLines/ltra7_4_line.sp | 113 |
1 files changed, 113 insertions, 0 deletions
diff --git a/Windows/spice/examples/TransmissionLines/ltra7_4_line.sp b/Windows/spice/examples/TransmissionLines/ltra7_4_line.sp new file mode 100644 index 00000000..7be4615a --- /dev/null +++ b/Windows/spice/examples/TransmissionLines/ltra7_4_line.sp @@ -0,0 +1,113 @@ +6.3inch 4 lossy lines LTRA model -- R load + +Ra 1 2 1K +Rb 0 3 1K +Rc 0 4 1K +Rd 0 5 1K +Re 6 0 1Meg +Rf 7 0 1Meg +Rg 8 0 1Meg +Rh 9 0 1Meg + + +* +* Subcircuit test +* test is a subcircuit that models a 4-conductor transmission line with +* the following parameters: l=9e-09, c=2.9e-13, r=0.3, g=0, +* inductive_coeff_of_coupling k=0.6, inter-line capacitance cm=3e-14, +* length=6.3. Derived parameters are: lm=5.4e-09, ctot=3.5e-13. +* +* It is important to note that the model is a simplified one - the +* following assumptions are made: 1. The self-inductance l, the +* self-capacitance ctot (note: not c), the series resistance r and the +* parallel capacitance g are the same for all lines, and 2. Each line +* is coupled only to the two lines adjacent to it, with the same +* coupling parameters cm and lm. The first assumption implies that edge +* effects have to be neglected. The utility of these assumptions is +* that they make the sL+R and sC+G matrices symmetric, tridiagonal and +* Toeplitz, with useful consequences (see "Efficient Transient +* Simulation of Lossy Interconnect", by J.S. Roychowdhury and +* D.O Pederson, Proc. DAC 91). + +* It may be noted that a symmetric two-conductor line is +* represented accurately by this model. + +* Subckt node convention: +* +* |--------------------------| +* 1-----| |-----n+1 +* 2-----| |-----n+2 +* : | n-wire multiconductor | : +* : | line | : +* n-1-----|(node 0=common gnd plane) |-----2n-1 +* n-----| |-----2n +* |--------------------------| + + +* Lossy line models +.model mod1_test ltra rel=1.2 nocontrol r=0.3 l=2.62616456193e-10 g=0 c=3.98541019688e-13 len=6.3 +.model mod2_test ltra rel=1.2 nocontrol r=0.3 l=5.662616446e-09 g=0 c=3.68541019744e-13 len=6.3 +.model mod3_test ltra rel=1.2 nocontrol r=0.3 l=1.23373835171e-08 g=0 c=3.3145898046e-13 len=6.3 +.model mod4_test ltra rel=1.2 nocontrol r=0.3 l=1.7737383521e-08 g=0 c=3.01458980439e-13 len=6.3 + +* subcircuit m_test - modal transformation network for test +.subckt m_test 1 2 3 4 5 6 7 8 +v1 9 0 0v +v2 10 0 0v +v3 11 0 0v +v4 12 0 0v +f1 0 5 v1 0.371748033738 +f2 0 5 v2 -0.601500954587 +f3 0 5 v3 0.601500954587 +f4 0 5 v4 -0.371748036544 +f5 0 6 v1 0.60150095443 +f6 0 6 v2 -0.371748035044 +f7 0 6 v3 -0.371748030937 +f8 0 6 v4 0.601500957402 +f9 0 7 v1 0.601500954079 +f10 0 7 v2 0.37174803072 +f11 0 7 v3 -0.371748038935 +f12 0 7 v4 -0.601500955482 +f13 0 8 v1 0.371748035626 +f14 0 8 v2 0.601500956073 +f15 0 8 v3 0.601500954504 +f16 0 8 v4 0.371748032386 +e1 13 9 5 0 0.371748033909 +e2 14 13 6 0 0.601500954587 +e3 15 14 7 0 0.601500955639 +e4 1 15 8 0 0.371748036664 +e5 16 10 5 0 -0.60150095443 +e6 17 16 6 0 -0.371748035843 +e7 18 17 7 0 0.371748032386 +e8 2 18 8 0 0.601500957319 +e9 19 11 5 0 0.601500955131 +e10 20 19 6 0 -0.371748032169 +e11 21 20 7 0 -0.371748037896 +e12 3 21 8 0 0.601500954513 +e13 22 12 5 0 -0.371748035746 +e14 23 22 6 0 0.60150095599 +e15 24 23 7 0 -0.601500953534 +e16 4 24 8 0 0.371748029317 +.ends m_test + +* Subckt test +.subckt test 1 2 3 4 5 6 7 8 +x1 1 2 3 4 9 10 11 12 m_test +o1 9 0 13 0 mod1_test +o2 10 0 14 0 mod2_test +o3 11 0 15 0 mod3_test +o4 12 0 16 0 mod4_test +x2 5 6 7 8 13 14 15 16 m_test +.ends test +* +x1 2 3 4 5 6 7 8 9 test +* +* +VS1 1 0 PWL(15.9NS 0.0 16.1Ns 5.0 31.9Ns 5.0 32.1Ns 0.0) + +.control +TRAN 0.2NS 50NS +plot v(1) v(2) v(6) v(7) v(8) v(9) +.endc +* +.END |