UNIVERSITY OF CALIFORNIA AT BERKELEY College of Engineering Department of Electrical Engineering and Computer Science R.W. Brodersen Homework #1 EECS 140 Mike Chen (Due 1/29/04) Spring 2004 1) Using the figure below, estimate the transistor model (Level 1) parameters: VTO, γ, k’, and λ. Assume W/L=10, φf=0.3V. Explain your method. Result (lin)050u100u150u200u250u300u350u400u450u500u550uVoltage X (lin) (VOLTS)0 500m 1Vgs = 1.2 V, Vbs = 0 VVgs = 0.9 V, Vbs = 0 VVgs = 0.6 V, Vbs = 0 VVgs = 1.2 V, Vbs = -0.4 VVgs = 0.9 V, Vbs = -0.4 VVgs = 0.6 V, Vbs = -0.4 VId (Y-axis) vs. Vds (X-axis) 2) An NMOS transistor has the following parameters: W=1.3 µm, L=0.13 µm, VTO=0.4 V, γ=0.5 V1/2, k’=100 µA/V2, and λ=0.01 V-1 Sketch gm-Vds characteristics for Vds from 0 to 1V and Vbs=0 V and –0.5 V. Assume Vgs=1 V.3) The figure below is the ln(Id)-Vgs characteristic with and without subthreshold modeling. Assuming the subthreshold current can be approximated with, mVwhereVeIITnVVVodTthgs26, ==− Estimate the value, n, in this model. Result (lin)-28-26-24-22-20-18-16-14-12-10-8-6Voltage X (lin) (VOLTS)0 200m 400m 600m 800m 1 1.2With subthreshold modelWithout subthreshold modelln(Id) (Y-axis) vs. Vgs (X-axis) 4) Learn to run HSPICE: a) Setup the HSPICE environment with the following instructions: http://bwrc.eecs.berkeley.edu/classes/ee140/howtos.htm b) Copy the SPICE file (demo3.sp) to your working directory from http://bwrc.eecs.berkeley.edu/classes/ee140/notes.htm c) Execute HSPICE and Awaves: c199.> hspice demo3.sp >! demo3.lis >info: ***** hspice job concluded c199.> awaves & d) View the results from awaves: Load the design from Design->Open, and Choose the waveforms you would like to see from Results Browser. e) Print out the Id-Vgs, and gm-Vgs
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