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EE312_THExam2 - i Perform a DC analysis to obtain VTC where...

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METU, Dept. of Electrical and Electronics Engineering EE312 Digital Electronics Take-Home Exam #2 Issued: March 10, 2011 Due: March 17, 2011 1. a) Draw the Voltage Transfer Curve (VTC) for a version of RTL Inverter given on the left considering no load at the output. Calculate and indicate V OH , V OL , V IL , V IH , N ML , N MH . Comment on the effects of R D on the VTC. b) Calculate the maximum fan-out (N) of this RTL inverter when it is driving identical inverters. Use β F =50, C JC =2pF, C JE =4pF to model the BJTs. 2. RTL SPICE Simulation: Consider an RTL inverter with active pull-up as given on the left. Simulate this circuit in LTspice . (LTspice software and its manual are available for downloading from Linear Technology
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Unformatted text preview: ) i. Perform a DC analysis to obtain VTC, where you sweep value of the input voltage and record the output voltage. ii. Perform a transient analysis to determine switching characteristics if this gate. Connect a 20pF load at the output and apply a 2 MHz square wave (0V-5V) with 50% duty cycle, with a rise and fall times of 20ns at the input. Find propagation delay, rise and fall times at the output. iii. Repeat part-ii for a 50pF load. Q V OUT R C R D R B V IN 4 k Ω 8 k Ω 5 k Ω β F =50 V BE (FA)=0.7V V BE (SAT)=0.8V V CE (SAT)=0.2V 5 V Q V OUT R C R B V IN 10 k Ω 1.2 k Ω 5 V R CP 120 Ω 5 V Q 1 R B0 Q P 10 k Ω 10 k Ω R BP...
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