By G. Fontaine
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Extra info for Transistors in Pulse Circuits
39 Fig. 40 I v Fig. 41 28 Note on the use of the networks with static characteristics. When a rectangular voltage is applied to the terminals of a junction, the current in the circuit is very different from the applied signal. Fig. 39 shows the voltage variations with time. These variations give the diode the following stages: (a) in the absence of bias from instant t 1 to the instant preceding t 2 ; (b) with a given forward bias, from instant t 2 to instant t 3 • From instant t 1 to the instant preceding t 2 , the graph is horizontal corresponding to the equilibrium hole density in the N region.
At instant t 2 c the diagram is near to its final position. The current has decreased again and is therefore near to 11 • At instant t2d, which is not shown in Fig. 37, the density graph is very near its final position and the current is still nearer to the value / 1 • At instant t 2 ', the graph is inclined as shown by the full line in Fig. 37 and the current is equal to / 1 • Fig. 38 shows the transient shape of the current when the bias of the junction changes suddenly from zero to a given forward value.
74b) and the small number of majority carriers in each cubic centimetre of the N region causes it to present a high resistance to the passage of the current (left hand position of the slider of the potentiometer). Since the graphs are horizontal the corresponding angle is equal to zero, and the current in the circuit is therefore zero. From instant t 1 to the instant preceding t 2 (Fig. 74c) no current flows in the circuit. At instant t 3 the voltage V3 is still applied at the terminals ofthe circuit.
Transistors in Pulse Circuits by G. Fontaine