Hi, I'm a new ngspice user (and a new spice user) and I should want to know if the avalanche breakdown effect of a bjt is simulated. I'm trying to simulate a small part of the following circuit: http://www.holmea.demon.co.uk/Avalanche/Avalanche.htm (only +130V, R2, Q1, R7, R4, R8, R5) Here is the description circuit: * Pulse generator .include 2N3904.ckt VCC 1 0 DC 130 R1 1 2 100k R2 3 0 3.3k R3 4 5 22 R4 5 0 10 R5 5 6 47 C1 2 0 50p Q1 2 3 4 2N3904 .tran 100n 1000U .plot v(5) 2N3904.ckt * Model generated on Aug 07, 01 * MODEL FORMAT: SPICE3 .MODEL 2n3904 npn +IS=1.26532e-10 BF=206.302 NF=1.5 VAF=1000 +IKF=0.0272221 ISE=2.30771e-09 NE=3.31052 BR=20.6302 +NR=2.89609 VAR=9.39809 IKR=0.272221 ISC=2.30771e-09 +NC=1.9876 RB=5.8376 IRB=50.3624 RBM=0.634251 +RE=0.0001 RC=2.65711 XTB=0.1 XTI=1 +EG=1.05 CJE=4.64214e-12 VJE=0.4 MJE=0.256227 +TF=4.19578e-10 XTF=0.906167 VTF=8.75418 ITF=0.0105823 +CJC=3.76961e-12 VJC=0.4 MJC=0.238109 XCJC=0.8 +FC=0.512134 CJS=0 VJS=0.75 MJS=0.5 +TR=6.82023e-08 PTF=0 KF=0 AF=1 In the circuit, C1 replace the open-ended 50 ohms coaxial line. Regards, Alain
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