UNIVERSITY OF CALIFORNIA AT BERKELEY College of Engineering Department of Electrical Engineering and Computer Science R W Brodersen Mike Chen Homework 1 Due 1 29 04 EECS 140 Spring 2004 1 Using the figure below estimate the transistor model Level 1 parameters VTO k and Assume W L 10 f 0 3V Explain your method Id Y axis vs Vds X axis 550u 500u Vgs 1 2 V Vbs 0 V 450u 400u Vgs 1 2 V Vbs 0 4 V Result lin 350u 300u 250u Vgs 0 9 V Vbs 0 V 200u Vgs 0 9 V Vbs 0 4 V 150u 100u Vgs 0 6 V Vbs 0 V 50u Vgs 0 6 V Vbs 0 4 V 0 0 500m Voltage X lin VOLTS 1 2 An NMOS transistor has the following parameters W 1 3 m L 0 13 m VTO 0 4 V 0 5 V1 2 k 100 A V2 and 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 Vgs Vth I d I o e nVT whereVT 26mV Estimate the value n in this model ln Id Y axis vs Vgs X axis 6 8 10 12 14 Result lin 16 With subthreshold model 18 20 22 Without subthreshold model 24 26 28 0 200m 400m 600m Voltage X lin VOLTS 800m 1 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 curves 1 2
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