ECE 394 - Experiment 1 - 1 Introduction The purpose of this...

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1. Introduction: The purpose of this experiment is to become familiar with important circuit parameters for some of the most common logic gates, namely CMOS Inverter and NAND gates. In this lab, we focus only on two parameters, Propagation delay and Noise Margin. Propagation Delay is the time taken by the input signal to propagate from the input terminal to the output terminal of a gate. Normally, it is measured as the difference between the time at half the voltage swing of the input signal and the time at half the voltage swing of the output signal as shown in Figure 1 below. Fig. 1 – Measuring Propagation Delay of Logic Gate Noise Margin is the maximum noise voltage added to the original supply signal without causing undesirable change in the output signal. The noise margin of CMOS logic gates is approximately 40% of the input voltage. After finishing this lab, students should have successfully accomplished the following objectives: Objectives: Measure the circuit parameters, such as propagation delay and noise margins, of the CMOS inverter and NAND logic gates. Use NAND and Inverter logic gates to construct an AND gate. Then, measure the circuit parameters of the new gate Examine the behavior of the CMOS Transmission Gate Equipment: Protoboard CMOS Inverter Gate – 4069 Chip CMOS NAND Gate – 4011 Chip CMOS Transmission Gate – 4066 Chip 2 Signal Generators
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Oscilloscope and 10x probes Multimeter 2. Procedure: PART I – MEASURING PARAMETERS OF CMOS INVERTER LOGIC GATE 1. Find the CD4069 chip in your electronics kit. Then, use one of its six inverters, along with a potentiometer and DC input source, to construct the circuit displayed in Figure 2 below. Note that the DC supply voltage for the chip should be connected to pin 14 (VDD) and the Ground should be connected to pin 7 (Vss) as shown in Figure 3. Fig. 2 – Circuit used to plot CMOS Fig. 3 – CD4069 chip pin Inverter Input – Output Characteristic configuration 2. Utilizing the potentiometer, change the input voltage to the Inverter between 0V and 5V. Record the input and output voltages to the inverter each time. Then, use the collected measurements to construct the Input – Output Transfer Characteristic of the
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