Problem

Determine VD and VGS for the fixed-bias configuration of Fig. 7.79.FIG. 7.79

Determine VD and VGS for the fixed-bias configuration of Fig. 7.79.

FIG. 7.79

Step-by-Step Solution

Solution 1

Refer to Figure \(7.79\) from the textbook.

From Figure \(7.79\), calculate the voltage between the gate-source terminal voltage \(V_{G S}\).

\(V_{G S}=V_{P}\)

The voltage \(\left(V_{P}\right)\) is \(-4 \mathrm{~V}\).

Write the gate-source voltage \(V_{G S}\).

\(V_{G S}=-4 \mathrm{~V}\)

Therefore, the gate-source voltage \(V_{G S}\) is

Due to the negative value of the gate source voltage, the drain current \(\left(I_{D}\right)\) is zero.

\(I_{D}=0 \mathrm{~mA}\)

Calculate the voltage at the drain terminal.

\(V_{D}=V_{D D}-I_{D} R_{D} \ldots \ldots\) (1)

Substitute \(18 \mathrm{~V}\) for \(V_{D D}, 2 \mathrm{k} \Omega\) for \(R_{D}\) and \(0 \mathrm{~mA}\) for \(I_{D}\) in equation (1).

\(\begin{aligned} V_{D} &=18-(0)\left(2 \times 10^{3}\right) \\ &=18-0 \\ &=18 \mathrm{~V} \end{aligned}\)

Therefore, the drain voltage \(\left(V_{D}\right)\) is \(18 \mathrm{~V}\)

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