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ECE20B Lab, Winter 2002 1 Lab 1 Prelab Assignment (Week 2, January 14 - 18) Reading Assignment: Lab Book (Carley and Khosla) Chapter 7 (Operational Amplifiers) Reference: ECE 20B Lectures, Rizzoni, pgs 541-552 Prelab Questions: 1. (1 point) Label the input, output and bias (power supply) ports of an op-amp, give the equation governing the Vout in terms of the other voltages. Briefly describe this equation. 2. (1 point) Describe the operation of the comparator circuit shown in Fig. 2.1; calculate the threshold voltage at the “+” terminal of the op-amp? 3. (1 point) What is the function of the op-amp when connected in the buffer mode (as shown in Fig. 2.2)? Derive the amplifier gain (defined as the ratio of Vout to Vin) in this configuration? 4. (1 point) Analyze (output versus input voltages) the inverting amplifier circuit shown in Fig. 2.3. Derive the amplifier gain? 5. (1 point) Analyze (output versus input voltages) the non-inverting amplifier circuit shown in Fig. 2.4. Derive the amplifier gain? Experiment 1: (Exercises 1-4, chapter 7) Comparator 1) Follow the pinout diagram (see Fig 7.5 in chapter 7) of LM741CN chip. Place the chip on the protoboard and complete the voltage comparator circuit as shown in Fig 2.1 below. Power the op-amp to + (-) 5V using the + (-) 20 V power supply with protoboard ground connected to the common of the power supply. 2) Measure the (threshold) voltage at the “+” terminal of the op-amp and compare with the analysis in Prelab 2. Explain any discrepancies. 3) Use the DC offset on the function generator as V in (Note: Operate the generator in ‘continuous’ mode) Vary its value from –5 to 5 V. Make a linear plot of Vout versus Vin. (Be sure you label the axes (with units), mark the scale, and give a title to the graph!) Compare the result of this plot to the threshold voltage measured in step (2). How close is the Vout to the values of the + (-) 5V power supply voltages? ECE20B Lab, Winter 2002 2 Fig. 2.1 Comparator Circuit Experiment 2: (Exercise 5, chapter 7) Buffer 4) Construct the buffer circuit shown in Fig 2.2. 5) Vary Vin from –5V to 5V. Plot Vout versus Vin. What is Vout when Vin is zero? Define gain of the amplifier as the ratio of V out to Vin (or the slope of the Vout versus Vin curve. What the amplifier gain in the non-saturated region? How does it compare to your analysis in Prelab Question 3. +5v _ V out Vin + -5v Fig. 2.2 Buffer circuit ECE20B Lab, Winter 2002 3 Experiment 3: (Exercise 6, chapter 7) Inverting Amplifier 6) Construct the inverter circuit shown in Fig. 2.3 using R1 = 1.5 k and RF = 6.8 k. Power the op-amp to + 15 and –15 V respectively. Vary the Vin from –5 V to 5V. Plot Vout versus Vin. What is the actual amplifier gain? (Slope of curve) How does it compare with your analysis in Prelab Question 4? What is the input voltage range over which the op amp is not saturated? Explain your observations. Fig. 2.3 Inverting Amplifier circuit Experiment 4: (Exercise 7, chapter 7) Non-inverting Amplifier 7) Construct the non inverting circuit shown in Fig. 2.4 using the same R1 and RF as in (6) above. Power the op-amp to + 15 and –15 V respectively. Vary the Vin from –5 V to 5V. Plot Vout versus Vin. What is the actual amplifier gain? How does it compare with your analysis in Prelab Question 5? What is the input voltage range over which the op amp is not saturated? Explain your observations. Fig. 2.4 Non-inverting amplifier