Consider the JFET amplifier in Figure 4.53 with transistor parameters \(I_{D S S}=6 \mathrm{~mA}, V_{P}=-3 \mathrm{~V}\), and \(\lambda=0.01 \mathrm{~V}^{-1}\). Let \(V_{D D}=10 \mathrm{~V}\).

(a) Determine \(R_{D}\) and \(V_{G S}\) such that \(I_{D Q}=4 \mathrm{~mA}\) and \(V_{D S Q}=6 \mathrm{~V}\).

(b) Determine \(g_{m}\) and \(r_{o}\) at the \(Q\)-point.

(c) Determine the small-signal voltage gain \(A_{v}=v_{o} / v_{i}\) where \(v_{o}\) is the time-varying portion of the output voltage \(v_{O}\).

Figure 4.53:-

Transcribed Image Text:

Vi VDD +1 iG HIH VGS RD vo + VGS UDS Figure 4.53 JFET common- source circuit with time- varying signal source in series with gate de source