UNIVERSITY OF CALIFORNIA AT BERKELEY College of Engineering Department of Electrical Engineering and Computer Science R.W. Brodersen Homework #1 EECS 140 Jianhui Zhang ( Due 9/3/03 ) Fall 2003 1. An NMOS transistor has parameters W=10um, L=1um, k’=194uA/V2, λ = 0.024V-1, tox = 8nm, Φf = 0.3V, Vt0 = 0.6V, and Na = 5×1015 atoms/cm3. Ignore velocity saturation. (a) Sketch the ID-VDS characteristics for VDS from 0 to 3V and VGS = 0.5V, 1.5V and 3V. Assume VSB = 0. (b) Sketch the ID-VGS characteristics for VDS = 2V as VGS varies from 0 to 2V with VSB = 0, 0.5V, and 1V. 2. Use the figure on the next page to estimate the model parameter Vt0, γ, k’, and λ. Then calculate the small signal parameter ( gm, gmbs, and ro ) associate with the operating points A, B, and C on the graph. Assume W/L = 50 and Φf = 0.3V.3. Getting familiar with HSPICE. (a) Make sure your account is correctly setup. Follow the instruction below to setup your instructional account. http://bwrc.eecs.berkeley.edu/classes/ee140/howtos.htm#hspice (b) Create the same file below in your home directory http://bwrc.eecs.berkeley.edu/classes/ee140/notes/disc2/demo1.sp (c) Simulate the demo circuit file. >hspice demo1.sp >! demo1.lis Upon proper completion of the simulation, you should see the following: >info: *****hspice job concluded (d) View the results of the AC analysis. Load awaves and examine the results of the AC analysis by entering the following: >awaves& Once awaves loads, click on Design/Open. Double-click demo1.sp which should open the Results Brower. To view the AC analysis, click on AC: A simple ac run. Select the waveforms that you want to display. (e) Print out the waveform of v(1), v(2), i(r2), i(c1) on the same
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