hw5 - Tufts University, ECE Dept. Feb 22, 2008 BE 12:...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 2
Background image of page 3
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Tufts University, ECE Dept. Feb 22, 2008 BE 12: Homework # 5, Spring 2008 Due: Mar 03, 2008 1. For the Common—Base amplifier shown in Figure—1: (a) Draw the small—signal model of the amplifier. Assume the coupling capacitors(CCl, 002) are shorts for the frequency of interest. Also neglect the output impedance (r0) of the transistor. (b) From the small-signal model derive AU,AUO,AZ-,Zm, Zout and Power Gain (G) in terms of the circuit parameters. (c) For RL = 10169, RC = 10199, VCC = 10V and Rs = 1009, to what value must the bias current Idc be set in order that the input impedance Zm matches R3 (i.e. Zm = 1009)? What is the resulting voltage gain from the source to the load ? Assume a z 1. VT=2BMV 2. For the Common-Base amplifier in Prob-1 and for the values given in Prob—1(c), find the short—circuit two—port model parameters shown in F igure—2. where: Gm: in 'Ui 110:0 ‘ ’ __ A G = M Lin‘ my. v0 vin=0 . “'71 00:0 Z, = 13—2 1" vinzo BE 12: Homework # 5 Page 2 of 3 3. A certain NMOS transistor has W 2 10pm, L = 1pm, kn = 50nA/V2, and VT = 1V. For the three circuits shown in Figure—3, find the region of operation (ie. cut—off,triode ! or saturation) and using the appropriate equation determine the drain current (ID). lb ID V09 V135 __X___——'\ 2v fi 3 ° 5V Figuve' 3 z (a) C b) (C) 4. In this problem you are trying to characterize a Common-Emitter amplifier to create a two—port equivalent circuit as shown in Figure—4. Based on measurement values extracted experimentally, you can derive the the two-port model of the amplifier. The experimental setup is: 0 You are driving the amplifier with lKHZ source with amplitude of 100mV (ie. vs = 100mV - sin(wt)). o In series with the source is a 1009 resistance (ie. Rs = 1009). This source is AC coupled which is assumed to be a short for this particular frequency. . o The load resistance is 12/69 (ie. RL = 2169). Following are measurement values for the given experimental setup: 0 The peak voltage measured at the input is 50mV (ie. Um = BOmV). o The peak voltage measured at the output, without the load, is 500mV (ie. vout 500mV). o The peak voltage measured at the output, with the load, is 333mV (ie. Um 333mV). | I ll Based on the measurement, determine the two—port model parameters, Zin, Z0, Gm. \ __ - __ - , , . ‘ p "2—Port model f0“ F‘qu c5 wph‘h‘wr. EB 12: Homework # 5 Page 3 of 3 5. Find the transfer function (0/1) for the given graph using Mason’s Gain formula. ...
View Full Document

Page1 / 3

hw5 - Tufts University, ECE Dept. Feb 22, 2008 BE 12:...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online