Microelectronic Circuits Quiz 10 for ECE 3040 - Solving Circuit Problems, Quizzes of Electrical and Electronics Engineering

Download Microelectronic Circuits Quiz 10 for ECE 3040 - Solving Circuit Problems and more Quizzes Electrical and Electronics Engineering in PDF only on Docsity! ECE 3040 Microelectronic Circuits Quiz 10 July 21, 2004 Professor Leach Name Instructions. Print your name in the space above. The quiz is closed-book and closed-notes. The quiz consists of one problem. Honor Code Statement: I have neither given nor received help on this quiz. Initials 1. The potentiometer has a resistance RP = 100kΩ. The resistance from the potentiometer wiper to ground is labeled xRp, where 0 ≤ x ≤ 1. The voltage gain is a maximum when x = 1. It is desired to have vO/vI = 30 when x = 1. When vO = 10V, the current through R2 is 1/3mA. (a) Solve for R1 and R2. 1 + R2 R1 = 30 =⇒ R1 +R2 = 30R1 10 = 1 3 (R1 +R2) = 1 3 × 30R1 =⇒ R1 = 1kΩ R2 = 30R1 −R1 = 29R1 = 29kΩ (b) Plot the voltage gain vO/vI as a function of x for 0 ≤ x ≤ 1. y = 30x vO vI = xRP (1− x)RP + xRP × 30 = 30x 0 5 10 15 20 25 30 0.2 0.4 0.6 0.8 1x 1