BJTdriver -- 24inch lossy line LTRA model -- DiodeCircuit * This unclassified circuit is from Raytheon, courtesy Gerry Marino. * It consists of a BJT driver connected by a 24 inch lossy line to a * passive load consisting mostly of diodes. Each inch * of the lossy line is modelled by 10 LRC lumps in the Raytheon * model. * The line parameters (derived from the Raytheon input file) are: * L = 9.13nH per inch * C = 3.65pF per inch * R = 0.2 ohms per inch * the circuit v1 1 0 0v pulse(0 4 1ns 1ns 1ns 20ns 40ns) vcc 10 0 5v *rseries 1 2 5 x1 1 2 10 bjtdrvr *t1 2 0 3 0 z0=50.0136 td=4.38119ns rel=10 o2 2 0 3 0 lline1 *x2 2 3 oneinch *x2 100 101 twentyfourinch *x2 100 101 xtwentyfourinch vtest1 2 100 0 vtest2 101 3 0 x3 3 4 10 dioload *rl 3 0 5 *dl 0 3 diod2 .model lline1 ltra rel=1 r=0.2 g=0 l=9.13e-9 c=3.65e-12 len=24 steplimit .model qmodn npn(bf=100 rb=100 cje=0.09375pF cjc=0.28125pF is=1e-12 +pe=0.5 pc=0.5) .model qmodpd npn(bf=100 rb=100 cje=0.08187pF cjc=0.2525pF is=1e-12 +pe=0.5 pc=0.5) .model qmodpdmine npn(bf=100 rb=100 cje=0.08187pF cjc=0.05pF is=1e-12 +pe=0.5 pc=0.5) .model dmod1 d(n=2.25 is=1.6399e-4 bv=10) .model dmod2 d .model dmod d(vj=0.3v) .model diod1 d(tt=0.75ns vj=0.6 rs=909 bv=10) .model diod2 d(tt=0.5ns vj=0.3 rs=100 bv=10) .options acct +reltol=1e-3 abstol=1e-14 .control tran 0.1ns 60ns plot v(1) v(2) v(3) .endc * bjt driver - 19=input, 268=output, 20=vcc; wierd node numbers from * the Raytheon file .subckt bjtdrvr 19 268 20 q1 22 18 13 qmodn q2 18 16 13 qmodn qd2 21 9 0 qmodn q4 14 14 0 qmodn q3 16 15 14 qmodpd q5 8 13 17 qmodn q6 25 12 0 qmodn q7 6 17 0 qmodpd qd1 26 10 0 qmodn q8 7 11 10 qmodn q10 268 17 0 qmodpdmine *q10 268 17 0 qmodpd q9 7 10 268 qmodn d1 0 19 dmod1 d2 18 19 dmod2 d3 13 19 dmod dq1 18 22 dmod dq2 16 18 dmod d502 9 21 dmod dq3 15 16 dmod d10 24 8 dmod d4 15 6 dmod dq6 12 25 dmod dq7 17 6 dmod dd1 17 10 dmod d7 11 6 dmod dd2 17 26 dmod d9 23 6 dmod dq8 11 7 dmod d501 17 268 dmod dq9 10 7 dmod d14 20 27 dmod d8 0 268 dmod r1 18 20 6k r2 22 20 2.2k r4 0 13 7k rd1 9 13 2k rd2 21 13 3k r3 16 20 10k r5 15 20 15k r9 0 17 4k r6 24 20 750 r10 12 17 2k r12 24 11 1.5k r11 25 17 3k r15 23 20 10k r13 0 10 15k r14 7 27 12 .ends bjtdrvr * subckt dioload - diode load: input=28, output=4, vcc=5 .subckt dioload 28 4 5 *comment out everything in dioload except d5 and r503, and watch * the difference in results obtained between a tran 0.1ns 20ns and * a tran 0.01ns 20ns c1 28 0 5pF r503 0 4 5.55 r4 0 28 120k r5 1 5 7.5k d5 4 28 diod2 d1 1 28 diod1 d4 2 0 diod1 d3 3 2 diod1 d2 1 3 diod1 .ends dioload * subckt lump - one RLC lump of the lossy line *10 segments per inch .subckt lump 1 2 *r1 1 3 0.02 *c1 3 0 0.365pF *l1 3 2 0.913nH l1 1 3 0.913nH c1 2 0 0.365pF r1 3 2 0.02 *r1 1 3 0.01 *c1 3 0 0.1825pF *l1 3 4 0.4565nH *r2 4 5 0.01 *c2 5 0 0.1825pF *l2 5 2 0.4565nH *c1 1 0 0.365pF *l1 1 2 0.913nH .ends lump .subckt oneinch 1 2 x1 1 3 lump x2 3 4 lump x3 4 5 lump x4 5 6 lump x5 6 7 lump x6 7 8 lump x7 8 9 lump x8 9 10 lump x9 10 11 lump x10 11 2 lump .ends oneinch .subckt fourinch 1 2 x1 1 3 oneinch x2 3 4 oneinch x3 4 5 oneinch x4 5 2 oneinch .ends fourinch .subckt fiveinch 1 2 x1 1 3 oneinch x2 3 4 oneinch x3 4 5 oneinch x4 5 6 oneinch x5 6 2 oneinch .ends fiveinch .subckt twentyfourinch 1 2 x1 1 3 fiveinch x2 3 4 fiveinch x3 4 5 fiveinch x4 5 6 fiveinch x5 6 2 fourinch .ends twentyfourinch *modelling using R and lossless lines *5 segments per inch .model llfifth ltra nocontrol noprint rel=10 r=0 g=0 l=9.13e-9 +c=3.65e-12 len=0.2 steplimit quadinterp .subckt xlump 1 2 o1 1 0 3 0 llfifth r1 2 3 0.04 .ends xlump .subckt xoneinch 1 2 x1 1 3 xlump x2 3 4 xlump x3 4 5 xlump x4 5 6 xlump x5 6 2 xlump *x5 6 7 xlump *x6 7 8 xlump *x7 8 9 xlump *x8 9 10 xlump *x9 10 11 xlump *x10 11 2 xlump .ends xoneinch .subckt xfourinch 1 2 x1 1 3 xoneinch x2 3 4 xoneinch x3 4 5 xoneinch x4 5 2 xoneinch .ends xfourinch .subckt xfiveinch 1 2 x1 1 3 xoneinch x2 3 4 xoneinch x3 4 5 xoneinch x4 5 6 xoneinch x5 6 2 xoneinch .ends xfiveinch .subckt xtwentyfourinch 1 2 x1 1 3 xfiveinch x2 3 4 xfiveinch x3 4 5 xfiveinch x4 5 6 xfiveinch x5 6 2 xfourinch .ends xtwentyfourinch .end