Download An Introduction to Linear Circuits - Experiment 2 | CEET 3010 and more Lab Reports Microelectronic Circuits in PDF only on Docsity! Laboratory 2 CEET 3010 Fall 2008 Linear Circuits Purpose: To demonstrate proportionality and superposition techniques for linear circuits. Equipment and Components: • Prototyping board, Multimeter, Power Supply, Signal Generator, Oscilloscope. • Resistors: 4.7 kΩ, 5 - 10 kΩ, 27 kΩ . Preliminary: A large majority of the circuits we study are linear or operate in a linear region. This means that the effects of independent sources (voltage and/or current) on currents or voltages at other parts of a circuit are proportional to the source strengths. Mathematically this is written as Where Xo is a current or voltage some where in the circuit and S1 and S2 are the independent sources which are linearly scaled by the constants K1 and K2 (the Gains). One result of linearity is that once the solution of the voltage and/or current in one part of the circuit is known for a given source, it can be extended to other sources by scaling the calculated values proportional to the new source voltage or current. A second very useful result of linearity is superposition where the total currents or voltages in various points of the circuits can be found by adding the voltages or currents due to each source taken one at a time while disabling the other sources. 1. For the network of Figure 2.1 compute the proportionality constant K that relates the output voltage Vo to Vi by Vo = K Vi. Compute a different proportionality constant (K) for the relationship between Vi and Io by Io = K Vi. 2. Use superposition for the network of Figure 2.2 to compute the proportionality constants K1 and K2 that relates the output voltage Vo to the independent sources Vi1 and Vi2. Express the values as a function Vo = K1 Vi1 + K2 Vi2. 3. Using the DC sweep analysis of PSpice create a plot of Vo and Io for Figure 2.1 verses Vi over the range 0 to 15 Volts. Calculate the gain values from the graph. 4. Using the DC sweep analysis of PSpice create a plot of Vo for Figure 2.2 verses Vi1 for the main sweep over the range 0 to 5 Volts and Vi2 from 0 to 15 Volts. Use the nested sweep for Vi1 in 1 Volt increments and use Probe to create a plot of Vo. Determine the values for K1 and K2 from the plot.
