FOUR TRANSISTOR AMPLIFIRE VCC 8 0 30 VIN 1 0 DC 0 AC 1 SIN(20E-3 10E-3 1K 0 0) Q1 0 1 2 Q2N2907A Q2 0 2 3 Q2N2907A Q3 4 3 5 Q2N2222A Q4 7 4 6 Q2N2222A * TEMPERATURE COEFFICIENT OF 100PPM R1 8 3 5K TC=1E-4 R2 8 4 24K TC=1E-4 R3 5 0 680 TC=1E-4 R4 8 7 20K TC=1E-4 R5 6 0 2.4K TC=1E-4 * TRANSISTOR DEFINITIONS .MODEL Q2N2222A NPN(IS=14.34F XTI=3 EG=1.11 VAF=74.03 BF=255.9 + NE=1.307 ISE=14.34F IKF=.2847 XTB=1.5 BR=6.092 NC=2 ISC=0 IKR=0 + RC=1 CJC=7.306P MJC=.75 VJC=.75 FC=.5 CJE=22.01P MJE=.377 + VJE=.75 TR=46.91N TF=411.1P ITF=.6 VTF=1.7 XTF=3 RB=10) .MODEL Q2N2907A PNP(IS=650.6E-18 XTI=3 EG=1.11 VAF=115.7 BF=231.7 + NE=1.829 ISE=54.81F IKF=1.079 XTB=1.5 BR=3.563 NC=2 ISC=0 + IKR=0 RC=.715 CJC=14.76P MJC=.5383 VJC=.75 FC=.5 CJE=19.82P + MJE=.3357 VJE=.75 TR=111.3N TF=603.7P ITF=.65 VTF=5 XTF=1.7 + RB=10) * GENERAL COMMANDS .TEMP 25 70 0 .OPTIONS NODE LIST LIMPTS=5001 ITL5=0 * OPERATING POINT TYPE COMMANDS .OP .TF V(7) VIN .SENS V(7) * TRANSIENT ANALYSIS COMMANDS .TRAN 40.0U 4.0M 0 40.0U .FOUR 1.0K V(7) .PRINT TRAN V(7) .PLOT TRAN V(7) * AC ANALYSIS COMMANDS .AC DEC 10 10 1MEG .PRINT AC VM(7) VP(7) VDB(7) IM(VIN) .PLOT AC VDB(7) VP(7) VM(7) IM(VIN) * DC ANALYSIS SOMMANDS .DC VIN -.2 .2 2.5M .PRINT DC V(7) .PLOT DC V(7) .END