Spice3BenchmarkDifferentialPairSimple differential pair 
This information is part of the Modelica Standard Library maintained by the Modelica Association.
This Differential pair model is one of the five benchmark circuits described in the SPICE3 Version e3 User's Manual (see information of package Spice3).
The differential pair circuit is operating in the differential mode. This means the input voltage VIN that is only applied at one transistor is amplified. To comprehend this behavior the user is recommended to simulate from t=0 to t=1s and observe "VIN.p.v" which is the input voltage and "Outputvoltage" which is the amplified output voltage.
Original SPICE3 netlist of the Differential pair:
SIMPLE DIFFERENTIAL PAIR
VCC 7 0 12
VEE 8 0 12
VIN 1 0 AC 1
RS1 1 2 1K
RS2 6 0 1K
Q1 3 2 4 MOD1
Q2 5 6 4 MOD1
RC1 7 3 10K
RC2 7 5 10K
RE 4 8 10K
.MODEL MOD1 NPN BF=50 VAF=50 IS=1.E12 RB=100 CJC=.5PF TF=.6NS
.TF V(5) VIN
.AC DEC 10 1 100MEG
.END
In the Modelica representation the tiny capacity CJC was set to 1e9F to get a higher numerical robustness. In future the numerical behavior will be analysed to be able to apply the original value CJC=.5PF.
MOD1 
Value: Type: ModelcardBJT 

VCC 
Type: V_pulse 


VEE 
Type: V_pulse 

VIN 
Type: V_sin 

RS1 
Type: R_Resistor 

RS2 
Type: R_Resistor 

Q1 
Type: Q_NPNBJT 

Q2 
Type: Q_NPNBJT 

RC1 
Type: R_Resistor 

RC2 
Type: R_Resistor 

RE 
Type: R_Resistor 

VIE 
Type: V_constant 

MOD1 
Type: ModelcardBJT 

g 
Type: Ground 