ECE 454 Homework #1 Due 11/28/2018 This Wednesday In Lab

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1 ECE 454 Homework #1 Due 11/28/2018 This Wednesday In Lab Design the Darlington push-pull amplifier specified in Lab 1: You will build this amplifier for Lab 1 so use parts that are available in the lab. For your design, you must calculate the following quantities: o The values of all components. o o The power delivered to the load. The power dissipated by each component in your circuit. (Why should you calculate the power dissipation?) Perform the following PSpice simulations o A bias-point analysis to display the DC voltages of your circuit when the input is zero. o A transient analysis that shows that your amplifier can deliver a sinusoidal current with an amplitude of 2 A to a 4 Ω load. ECE454 Homework Page 1 of 1

2 ECE 454 System Level Analog Electronics Lab 1 Design Specifications Design a Darlington push-pull amplifier with the following specifications: Available power supplies: ± 18 V. Load resistance: 4 Ω. Peak current to load: 2 Amps. One side of the load will be grounded. Amplifier must be thermally stable. Available Parts: Tip 102 Power Darlington NPN BJT Tip 107 Power Darlington PNP BJT Heat Sink 0.1 µf capacitors (For the power supply.) 680 µf capacitors (For the power supply.) 0.47 Ω, 2 Watt Resistor 10 Watt 4Ω Test load resistor. You will build two copies of the Push-Pull amplifier. They will be tested independently.

3 ECE 454 System Level Analog Electronics Lab 1 Design Specifications Perform this procedure for both push-pull amplifiers you construct. 1) DC Bias. Wire the circuit shown in Figure 1. C1 C2 0.1U RB1 Q2 TIP102 RE1 R1 Q6 C5 C6 10k 10u Q2N3904 RE2 Q4 TIP107 RB2 C3 C4 These two caps will be removed later. Figure 1 Measure the DC voltage at every node and verify that the DC node voltages are as expected. Adjust the potentiometer (R1) so that only a few milliamperes of standby current flow through the push-pull amplifier. 2) Let the amplifier of Figure 1 remain powered up for a long time. Observe the DC current drawn from the both power supplies (±15 V). If the current becomes too large or never reaches steady-state, you will need to increase the size of the emitter resistors, reduce the Zener voltage, or increase your thermal coupling between the 2N3904 Zener and the heat sink.

4 3) If your amplifiers are properly biased and thermally stable, add the OPAMP circuit as shown in Figure 2. The circuit should still be thermally stable and the push-pull amplifier should still draw the same small standby current. The only change should be that the bias voltages shift such that the DC voltage at the output is close to zero volts. Use two TL074 ICs, one for each push-pull amplifier. C1 C2 0.1U RB1 Q2 TIP102 RE1 R1 Q6 C5 C6 Vout 10k 10u Q2N3904 RE TL074 4 V 11 V- U1A 1 OUT RB2 Q4 TIP107 C3 C4 These two caps will be removed later. Figure 2 5) Test the circuit with a large sinusoidal input and no load as shown in Figure 3. Find the largest value of Vin that your amplifier can produce a low-distortion sine wave output. Verify that this amplitude will be large enough to produce 16 Watts peak when applied across a 4 Ω load. Run the circuit with Vin at its maximum for several minutes to verify that the amplifier is still thermally stable. 6) Add the 4 Ω load to the output and verify that you amplifier can supply 16 Watts peak to the 4 Ω load. 7) Run your amplifier at full load (16 Watts peak) for at least 20 minutes to verify its operation. 8) Show me that both of your amplifiers work at full power.

5 C1 C2 0.1U RB1 Q2 TIP102 RE1 R1 Q6 C5 C6 Vout 10k 10u Q2N3904 RE2 Analysis - 0 V TL074 4 V 11 V- U1A 1 OUT RB2 Q4 TIP107 C3 C4 These two caps will be removed later. Figure 3 Wiring Requirements Black: Ground Green: 5 V Red: VCC Yellow: V EE Blue Miscellaneous connections Use the bare bus wire whenever convenient and for high current connections. Wire wrap wire is 30 gauge and cannot be used for any high current connections. 18 gauge colored wire is also available for high color connections as well. Use 0.1 µf supply bypass capacitors on all OPAMP packages for this lab and all future labs. These bypass caps should go between the 15V supply and ground, and between the 15 V supply and signal ground.

6 Physical Mounting The TIP power transistors must be mounted to the heat sink with 4-40 screws, a plastic bushing, a mica insulator, and heat sink grease. If you are not familiar with the mounting procedures, please ask me. Your heat sink must be mounted to your board with 6-32 screws. Make sure that you mount the heat sink so that air can easily flow across the fins. Use the ohm-meter to test that the tabs of the TIP power transistors are not electrically connected.

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