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## Q. 3.2

Sketch the family of collector curves for the circuit in Figure 3–10 for $I_{B}$ = 5 μA to 25 μA in 5 μA increments. Assume that $β_{DC}$ = 100.

## Verified Solution

Table 3–1 shows the calculations of $I_{C}$ using the relationship $I_{C}$ = $\beta _{DC}$$I_{B}$ . The resulting curves are plotted in Figure 3–11 . To account for the forward Early voltage, the resulting curves are shown with an arbitrary upward slope as previously discussed.

 TABLE 3–1 $I_{B}$ $I_{C}$ 5 μA 0.5 mA 10 μA 1.0 mA 15 μA 1.5 mA 20 μA 2.0 mA 25 μA 2.5 MA