(Solved): Q7. (a) The JFET common-source amplifier shown in Figure Q7 has transistor properties, ...

Q7. (a) The JFET common-source amplifier shown in Figure Q7 has transistor properties, ???????????????? 6 ????, and ???? ?3. . If the transfer characteristic can be shown to be ???????? ???????????????? ( ? ???????????? ???????? ) 2 , find the value of RS required to give ID = 2.5 mA, [06 marks] and the resistance RD required to make VDS = 10 V [04 marks]  (b) If ???? ???? and ???????? ????. Draw the small signal equivalent circuit of that shown in Figure Q7, and determine the small signal voltage gain. [10 marks]

(a) The JFET common-source amplifier shown in Figure Q7 has transistor properties, \( I_{D S S}=6 m A \), and \( V_{P}=-3.5 \mathrm{~V} \). If the transfer characteristic can be shown to be \( I_{D}=I_{D S S}\left(1-\frac{V_{G S}}{V_{P}}\right)^{2} \), find the value of \( R S \) required to give \( I_{D}=2.5 \mathrm{~mA} \), [06 marks] and the resistance \( \mathrm{RD} \) required to make \( \mathrm{V}_{\mathrm{DS}}=10 \mathrm{~V} \) [04 marks] (b) If \( r_{d s}=100 \mathrm{k} \Omega \) and \( g_{f s}=2 \mathrm{~ms} \). Draw the small signal equivalent circuit of that shown in Figure Q7, and determine the small signal voltage gain. \( [10 \) marks] Figure Q7