# ECON 214-516 Equivalent Networks and Superposition

ECEN 214-516

Post-Lab 3

Equivalent Networks and Superposition

Procedure

1. First we constructed the circuit in Figure 3.4 of the lab manual.

1. For the power source instead of the batteries we used the voltage source on the PMD to generate a constant 3V power source.
2. We measured the source first to make our calculations more accurate later.
3. Next, we used the voltmeter to measure the voltage across the load resistor of
4. Then, we tested the same voltage after trying a 470 resistor and then keeping the circuit open.

Task 2: Verify the superposition principle

1. First we constructed the circuit in Figure 3.5 of the lab manual.

1. For the power sources we used both wave generator power sources on the PMD, to generate the constant 3V and 4V.
2. We then measured the sources for better calculation accuracy.
3. Then, we measured the voltage accros the 1kΩ resistor with both power sources active.
4. Next, we tested the same voltage but withopen, them again with open.

Task 3: Check the superposition principle validity for a non-linear device

1. First, we constructed the circuit in Figure 3.6 of the lab manual.

1. For the rest of Task 3, we followed the same steps as Task 2. The key difference between Task 2 and 3 is that there is a diode between the 1kΩ and the 5.1kΩ resistors as shown in Figure 3.6.

Data Tables with Results

• Power Supply Voltage: 2.993 V

 2180 Ω 2000 Ω 0.764 V 1.597 V 2180 Ω 470 Ω 0.280 V 1.570 V 2180 Ω Open Circuit 1.605 V 1.605 V

Task 2: Verify the superposition principle

• Power Supply -: 2.992 V
• Power Supply -: 3.992 V

Table 2: Load Voltage Given Different Power Sources

 Parameter Measured Calculated % difference SPICE % difference (SPICE to measured) 3.992 V 4 V 0.200 4 V 0 2.992 V 3 V 0.267 3 V 0 0.283 V 0.291 V 2.75 0.291 V 2.75 -0.570 V -0.556 V -2.52 -0.556 V -2.52 -0.280 V -0.265 V -5.66 -0.265 V -5.66

Task 3: Check the superposition principle validity for a non-linear device

• Power Supply -: 2.992 V
• Power Supply -: 3.992 V

Table 3: Load Voltage Given Different Power Sources (with diode)

 Parameter Measured Calculated SPICE % Error 3.992 V 4 V 4 V 2.992 V 3 V 3 V 0.897 V 0.15 V 0.830 V 2.255x10^-9 V 1.11 V 1.125x10^-9 V

Equations and Calculations

Task 2: Verify the superposition principle

Task 3: Check the superposition principle validity for a non-linear device

Discussion: