and V DS V GS V T (the saturation region) I DS = k 2 (V GS V T )2 (1+ V DS )
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1 ECE 4420 Spring 2005 Page 1 FINAL EXAMINATION NAME SCORE /100 Problem 1O Sum Points INSTRUCTIONS: This exam is closed book. You are permitted four sheets of notes (three of which are your sheets for the 3 midterms plus a new sheet for the final exam). There should be no xerox reductions on your note sheets. The exam consists of 7, 20- point problems of which you are to work only 5 for a total of 100 points. Problem 1 must be worked and you may choose any four of the last six problems for a total of five problems. Please circle the number in the table above of the five problems you wish graded. If you do not indicate the problems to be graded, then problems 1 through 5 will be graded regardless of whether they are worked or not. Be sure to turn in only the 5 problems you wish graded in proper numerical order. Please show your work leading to your answers so that maximum partial credit may be given where appropriate. TRANSISTOR INFORMATION: The following is for an NMOS transistor only (with appropriate sign changes they can be used for PMOS transistors): V T = V T0 + ( 2 F + VSB - 2 F For long-channel devices, the current equations are: If V GS V T and V DS V GS V T (the saturation region) I DS = k 2 (V GS V T )2 (1+ V DS ) or V DS V GS V T (the linear region) I DS = k 2 [2(V GS V T )V DS - V DS 2 ] If V GS < V T (subthreshold region) I DS 0 For velocity saturated short-channel devices, the current equations are: If V GS V T (V GS V T )E c L and V DS (V GS V T ) +E c L (saturation region) I DS = Wv sat C (V GS V T ) 2 ox (V GS V T ) +E c L or V DS < (V GS V T )E c L (V GS V T ) +E c L (linear region)i DS = W μ e C ox L 1+ v V DS GS V T - V DS 2 V DS E c L If V GS < V T (subthreshold region) I DS = I s exp q(v GS -V T -V offset ) nkt 1- exp -qv DS kt 0.18μm 0.13μm Name Symbol NMOS PMOS NMOS PMOS Units Oxide Thickness t ox Å Oxide Capacitance C ox μf/cm 2 Threshold Voltage V TO V Body-Effect Term V 0.5 Fermi Potential 2 F V
2 ECE 4420 Spring 2005 Page 2 Junction Cap. Coeff. C j ff/μm 2 Built-In Junct. Potential B V Grading Coefficient m Nominal Mobility μ o cm 2 /V s Effective Mobility μ e cm 2 /V s Critical Field E c 6x x10 4 6x x10 4 V/cm Critical Field x L E c L V Effective Resistance R eff k /sq. Saturation Velocity v sat 8x10 6 cm/s CAPACITOR INFORMATION: Cutoff Linear Saturation C gs C ol C ol + 0.5C g C ol C g C gd C ol C ol + 0.5C g C ol C gb 1/(1/C g +1/C jc )<C gb < C g 0 0 C sb C jsb C jsb + 1 C jc C jsb + 1 C jc (, small) C db C jdb C jdb + 2 C jc C jdb + 2 C jc (, small) where, C ol = overlap capacitance C jc = channel to substrate depeletion capacitance C g = C ox L C j = C jb (A b +A sw ) 1- V j mj B where A b = area of source/drain and A sw = area of side of source/drain facing the channel Gate capacitance coefficient: C g = C ox L + 2C ol 2fF/μm Self capacitance coefficient: C eff = C j + 2C ol 1fF/μm Wire capacitance coefficient: C w =C int = 0.1fF/μm OTHER INFORMATION: ox = 4 o = x10-14 F/cm = 3.54x10-13 F/cm Logical Effort: Type of Gate 1 input 2 inputs 3 inputs 4 inputs Inverter NAND - 4/3 5/3 6/3 NOR - 5/3 7/3 9/3 Parasitic Terms: Type of Gate 1 input 2 inputs 3 inputs 4 inputs Inverter 1/ NAND - 1 3/2 2 NOR - 3/2 9/4 3
3 ECE 4420 Spring 2005 Page 3 Problem 1 - (20 points This problem is required) a.) a.) An interconnect line is 10 mm long, 0.5μm wide, and has a resistance of 27m /sq. and a capacitance of 0.1fF/μm and is driven by a 50X inverter (an inverter with an 200 PMOS and a 100 NMOS where = 0.1μm and L = 2 ). What is the total delay of the circuit as calculated from the Elmore delay assuming the pi model for the wire from the input of the inverter to the end of the interconnect line? Input x50 S05FEP1A 10 mm Output b.) Divide the 10mm wire above into 5 equal segments and use a buffer of x50 to drive each segment (use the existing buffer to drive the first segment). Find the new propagation delay calculated from the Elmore delay.
4 ECE 4420 Spring 2005 Page 4 Problem 2 (20 points This problem is optional) A bipolar-resistor inverter is shown along with the generic voltage transfer function. Use the large signal model of the BJT and the circuit to find values for V OH, V OL, V IL, and V IH. The large signal model for the BJT is I c = I s exp V in V t V in V CC = 2V R L = 1kΩ S05E1P4 V out V out 0 0 V in where I s = 1fA and V t = 25mV. The collector-emitter saturation voltage of the BJT is V CE (sat) = 0.2V. Use this information to find the values of NM H and NM L.
5 ECE 4420 Spring 2005 Page 5 Problem 3 (20 points This problem is optional) Design a pseudo-nmos inverter in 0.13μm technology to give V OH = V DD = 1.2V and V OL = 0.1V. Assume L = 200nm and find the value of the W s if W p = 200nm. Assume v sat = 8x10 6 cm/s. In 1.2V W p /L Out W n /L S05FEP1
6 ECE 4420 Spring 2005 Page 6 Problem 4 - (25 points) Calculate the optimum delay (in ps) and the size of the transistors (in μm) for the logic circuit shown. All devices are standard CMOS and all transistors have a minimum length of L = 0.1μm. C inv is the input capacitance of a minimum size inverter (W = 0.2μm). Input Output C inv 1000C inv S05FEP3
7 ECE 4420 Spring 2005 Page 7 Problem 5 (20 points This problem is optional) For the logic circuit shown below, assume that sel the transmission gates are all 4 :2 and that the A inverters driving the transmission gates have PMOS transistors that are 8 :2, and NMOS transistors that are 4 :2, where = 0.1μm. f = 4 The output inverter is to drive a 50 ff load. The OUT selb C output inverter is 4 times larger than the input inverters. (a.) Write the logic expression for the output B function in terms of A, B, sel, and selb. (b.) Draw an equivalent RC circuit model for sel S04E3P3 the path from A to C assuming that the sel signal is high. Write down the individual contributions for each resistance and capacitance and place the total values at the appropriate nodes. (c.) Find the Elmore delay from A to C.
8 ECE 4420 Spring 2005 Page 8 Problem 6 (20 points This problem is optional) A dynamic logic gate is shown. The pre-charge device has a W/L of 5, the n-channel devices have a W/L of 3, and inverter has a pull-up of 4 and a pull-down of 1. (a.) What is the logic function of the gate at the output of the inverter? (b.) Why is the output inverter skewed? (c.) Using the device sizes above, what is the logical effort of input B of the first stage of the domino logic (when its immediate output is falling), and the inverter (when its output is rising). Compute these two values separately. V DD φ A C E B D S04FEP6
9 ECE 4420 Spring 2005 Page 9 Problem 7 (20 points This problem is optional) Design the values of the access and pull-down transistor in the memory cell shown. Assume you are designing a 256x256 memory array and that the bit lines must change by 150mV in 300ps at which point the sense amplifier is activated. The total capacitance of the bit lies are 450fF each. Assume that W D /W A = 1.5. Be sure to state any other assumptions you use in working this problem. W A. V DD = 1.2V. Bit Wordline V DD Bit 1MΩ 1MΩ W A L A W D L D W D L D W A L A S05FEP7
10 ECE 4420 Spring 2005 Page 10 Extra Sheet
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