EL ENG 105 Study Guide - Midterm Guide: Jfet, Charge Carrier, Triode
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Closed book and notes; one 8. 5 x 11 page (both sides) of your own notes is allowed. Show all your work and reasoning on the exam in order to receive full or partial credit. A simplified large-signal model for an n-channel jfet is: i. V (saturation) where vp is the pinch-off voltage and n is the fudge factor. (a) [4 pts. ] Sketch the drain characteristics for this jfet on the graph below for. Vgs = 0 v, -0. 5 v, -1 v, and 1. 5 v. you can set n= 0 for this part. Your current values in saturation should be accurate; the triode curves can be sketched. Notes: (i) n is not zero for this part, (ii) you don"t need the plots in part (a) in order to answer this question. (c) [4 pts. ] What is the numerical value of the small-signal drain resistance ro at the operating point q1 (vgs = -0. 5 v, vds = 1. 5 v).
