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Question 4.SP.2: For the MOSFET amplifier of Example 4.5, let VGSQ = 6.90 V. ......

For the MOSFET amplifier of Example 4.5, let V_{GSQ} = 6.90  \text{V}. Calculate I_{DQ} from the analog of (4.2) developed in Section 4.8.
i_{D} = I_{DSS} \left(1 + \frac{v_{GS}}{V_{p0}} \right)^2        (4.2)

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From the drain characteristics of Fig. 4-9(b), we see that V_T = 4  \text{V} and that I_{D\text{on}} = 5  \text{mA} at V_{GSon} = 8  \text{V}.    Thus,

I_{DQ} = I_{D\text{on}} \left(1  –  \frac{V_{GSQ}}{V_T} \right)^2 = 5 × 10^{-3} \left(1  –  \frac{6.90}{4} \right)^2 = 2.63  \text{mA}

(Compare Example 4.5.)

4.9

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