Question

Student ID Family Name Other Name Date: Tutorial #9 (held in week 10) 4.1. The figure on the right represents a simplified schematic for a channel FET Fill in the four boxes showing the labels for the two remaining terminals and the type of semiconductor used in the two rcgions □type 4.2. The figure below shows a circuit with a voltage source and two resistors (a) Using the template draw the load line relating the output voltage vo and the current i. Label the voltage and the current at which the load line intercepts the two axes. Label the points or the load line corresponding to resistance R being an open-circuit and a short-circuit. Vo Vo (b) By analysing the circuit, find the output voltage vo as a function of the current i 4.3. The circuit below shows a simple amplifier based on a field-effect transistor. The template shows the transistor's characteristics. (a) Draw the load line of the circuit on the template (b) What are the maximum and minimum possible output voltages of the amplifier? (c) Using the graph what are the output voltages corresponding to viN -2V, -1V, ov, IV and 2V? (d) Plot these results on the template below. (e) Using only the numerical results from (c) corresponding to vIv -2V and 2V, estimate the gain and output offset for the amplifier.

Answer 1

(a) for a fixed R i = (30 v/3 k Ohm + R) V_0 = i R \r\n i = (30 V/3 k + R) v_0 = (30 V/3 k + R) R V_0 = i R for fixed R V_0 is linear function of i V_0 = (30 v/3 k + R) R v_0 = (30 v/23 k/R + 1)^R R = 0 v_0 = 30/infinity = 0 V R = infinity V_0 = 30 V/1 ohm = 30

figure for 3rd ques was not there