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2.7 Time-Domain Analysis of Nonlinear Dynamic Circuits 111<br />

8<br />

VCC<br />

RC1<br />

RC2<br />

RBIAS<br />

V1<br />

1<br />

RS1<br />

2<br />

4<br />

5<br />

Cload<br />

Q1 Q2<br />

Vout<br />

3<br />

RS2<br />

6<br />

7<br />

Q3<br />

Q4<br />

VEE<br />

9<br />

Figure 7.2: Differential amplifier circuit<br />

Again we start by writing a netlist (of course we could have used ReadNetlist as well). Let the<br />

values of the circuit elements be given as RS1 ⩵ RS2 ⩵ k, RC1 ⩵ RC2 ⩵ k, RBIAS ⩵ k, and<br />

CLOAD ⩵ pF. The supply voltages are VCC ⩵ V and VEE ⩵ V. For all transistors Q1, , Q4,<br />

we use the full Gummel-Poon transistor model implemented in the Analog Insydes model library<br />

(see Section 4.3.2). We assume the following model parameter values: transport saturation current<br />

IS ⩵ A, large-signal forward and reverse current gains BF ⩵ and BR ⩵ , and<br />

the global temperature TEMP ⩵ K.

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