2011-312HW4 - Q2. For the TTL inverter in the figure, a)...

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EE 312-DIGITAL ELECTRONICS SPRING 2010/2011 TAKE-HOME EXAM # 4: TRANSISTOR-TRANSISTOR LOGIC (TTL) Delivered on: 23 March 2011 Due (in class): 30 March 2011 Q1. For the TTL inverter in the figure, a) Explain the operation of the TTL inverter. Identify the proper modes for all transistors and diode, and present them in a table for input voltage V in . Explain the purpose of each transistor, diode, resistor in this arrangement. Sketch the voltage transfer characteristics (VTC). b) Is it possible to replace the diode D L with a schottky diode SD L ? Explain clearly. c) Calculate the maximum fanout. d) Calculate the average power dissipation of the inverter with no gates connected.
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Unformatted text preview: Q2. For the TTL inverter in the figure, a) Identify the proper modes for all transistors and diode, and present them in a table for input voltage V in . Find the voltage transfer characteristics (VTC). β F =40 β R =0.05 V BE(FA) =V BC(RA) =0.7 V V D(ON) =0.7 V V SD(ON) =0.3 V V BE(SAT) =0.8 V V CE(SAT) =0.2 V σ =0.90 R B =10 k Ω R C =6 k Ω R CP =0.1 k Ω R D =3 k Ω V CC =5 V β F =70 V BE(FA) =V BC(RA) =0.7 V V D(ON) =0.7 V V BE(SAT) =0.8 V V CE(SAT) =0.2 V R B =2.8 k Ω R C =0.76 k Ω R CP =0.058 k Ω R EP =4 k Ω R D =0.47 k Ω V CC =5 V...
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