# UCD EEC 118 - Lab #2- CMOS Inverter and Gates (3 pages)

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## Lab #2- CMOS Inverter and Gates

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## Lab #2- CMOS Inverter and Gates

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Pages:
3
School:
University of California, Davis
Course:
Eec 118 - Electronic Circuits II
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EEC 118 Spring 2006 Lab 2 CMOS Inverter and Gates Dept of Electrical and Computer Engineering University of California Davis April 2 2006 Reading Kang and Leblebici Chapter 5 Section 7 3 1 I OBJECTIVE The objective of this experiment is to determine the Voltage Transfer Characteristic VTC of a CMOS inverter and to observe its characteristics in circuit connections II PRELAB Figure 1 CMOS inverter wiring diagram 1 Problem 1 10 points Use your transistor data from Lab 1 to calculate at least ten points on the VTC including VOH VIH VOL and VIL for the CMOS inverter shown in Figure 1 HINT For simplicity in hand calculations take output voltage as the independent parameter calculate ID and input voltage from it III VOLTAGE TRANSFER CHARACTERISTIC Part 1 20 points Wire up the CMOS inverter shown in Figure 1 and observe its VTC Measure the same ten points you computed in the Prelab Compare with your calculated results from the Prelab Part 2 20 points Wire up a 2 input CMOS NOR gate using the transistors in the 4007 package a Show the schematic in your lab report be sure to label the pins Verify the NOR gate truth table b Connect the two inputs together Measure the VTC of this inverter How does the VTC for this inverter connected NOR gate differ from the inverter in Figure 1 Explain any observed differences IV GATE CONNECTION RING OSCILLATOR Figure 2 Connections for NOR gate ring oscillator Part 3 10 points The ring oscillator configuration shown in Figure 2 is often used to measure the average propagation delay time Derive a formula which relates the average delay time to the period of the waveform observed at the output of any of the gates in the oscillator Part 4 20 points Wire up 5 CD4001 CMOS NOR gates to form a ring oscillator as shown in Figure 2 Use the oscilloscope to measure its oscillation frequency at supply voltages of 5 7 5 10 12 5 and 15 V Also measure the current IDD drawn from the supply at each voltage From your results calculate the average propagation

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