Question 3.7: For the transistor circuit of Fig. 3-8(a), R1 = 1 kΩ, R2 = 2......

Schaum’s Outline of Electronic Devices and Circuits [1089587]

For the transistor circuit of Fig. 3-8(a), $R_1 = 1 kΩ, R_2 = 20 kΩ, R_C = 3 kΩ, R_E = 10 Ω$ , and $V_{CC} = 15 \text{V}$ . If the transistor is the generic npn transistor of Example 3.3, use SPICE methods to determine the quiescent values $I_{BQ}, V_{BEQ}, I_{CQ}$ , and $V_{CEQ}$ .

3.8

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The netlist code below models the circuit.

EX3_7.CIR – CE quiescent values
R1 0 1 1kohm
R2 2 1 20kohm
RC 2 3 3kohm
RE 4 0 10ohm
VCC 2 0 15V
Q 3 1 4 QNPNG
.MODEL QNPNG NPN(Is=10fA Ikf=150mA Isc=10fA Bf=150
+ Br=3 Rb=1ohm Rc=1ohm Va=30V Cjc=10pF Cje=15pF)
.DC VCC 15V 15V 1V
.PRINT DC IB(Q) IC(Q) V(1,4) V(3,4)
.END

Execute 〈Ex3_7.CIR〉 and poll the output file to find

VCC IB(Q) IC(Q) V(1,4) V(3,4)
1.500E+01 1.428E-05 2.575E-03 6.748E-01 7.252E+00

where $I_{BQ} = IB(Q), I_{CQ} = IC(Q), V_{BEQ} = V(1, 4),$ and $V_{CEQ} = V(3, 4)$ .

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