Massachusetts Institute of Technology Department of Electrical Engineering and Computer Science 6 002 Electronic Circuits Spring 2007 Homework 6 Handout S07 030 Issued 3 15 2007 Due 3 23 2007 Reading Section 7 7 and Sections 8 1 8 2 of A L Review Section 4 5 Exercise 6 1 Do Exercise 8 1 from A L Chapter 8 page 447 Exercise 6 2 Consider a two terminal device formed by a MOSFET with its gate tied to its drain The MOSFET is characterized by parameters VT and K and its drain to source voltage and drain current are denoted as vR and iR respectively a Write the vR iR relation for this device operating under the saturation discipline i e for vR VT b Develop a small signal model for this device about a dc operating point vR VR describing the relationship between vr and ir Problem 6 1 Do Problem 7 5 from A L Chapter 7 pages 396 397 with the following changes 2 For part a show that vOU T is related to vIN according to vOU T 2 vIN VT 2 vIN VT 0 instead of the equation listed in the book 1 RK vOU T For part b only nd the range for vIN Do not nd the corresponding range for vOU T You should be able to do this without having to solve any quadratic equations Problem 6 2 Do Problem 7 10 from A L Chapter 7 page 399 Problem 6 3 on back Cite as Anant Agarwal and Jeffrey Lang course materials for 6 002 Circuits and Electronics Spring 2007 MIT OpenCourseWare http ocw mit edu Massachusetts Institute of Technology Downloaded on DD Month YYYY RL VS vOUT vIN VS Figure 1 Ampli er Dual power supplies layout Problem 6 3 In many ampli ers we use dual power supplies so we can obtain a 0 V offset at the output An example is shown in Fig 1 For this problem use VS 1 5 V VS 1 5 V and MOSFET parameters K 1 mA V2 and VT 0 5 V Then a Find the value of RL such that vOU T 0 V when vIN 0 V b As vIN is increased the output voltage vOU T decreases For the value of RL found in part a nd the minimum output voltage vOU T such that the MOSFET will obey the saturation discipline Cite as Anant Agarwal and Jeffrey Lang course materials for 6 002 Circuits and Electronics Spring 2007 MIT OpenCourseWare http ocw mit edu Massachusetts Institute of Technology Downloaded on DD Month YYYY
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