Lab 2 Report - EE01LA Experiment 2 Attenuation & Power...

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EE01LA Experiment 2 Attenuation & Power Measurement Section 5 Fredrick Gertz Vicki Chen (2126) Joseph Vicario (3966)
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Purpose: The purpose of this lab is to test the rules for determining equivalent series or parallel resistance. The lab involves designing and constructing a series load resistor, and testing if the resistance matched attenuators cascaded in series, with the input resistance of each attenuator appearing to equal the resistive load, will result in an net attenuation that is the product of the individual gains. [refine wording later] Introduction: An attenuator is a circuit designed to supply less power at the output than was delivered at the input. Figure 1 A power supply and resistive load connected to an attenuator is depicted in Figure 1. The power supplied by the power source is Ps = ViIs = (Is)2Ra. (1) where Ra is the apparent input resistance of the loaded amplifier or attenuator. The power delivered to the load is PL = VoIL= (IL)2RL. (2) The gain of the circuit is defined to be G = and the loss is defined to be N = . Since this ratio can be very large or very small, it can be expressed as G = 10 log10 dbs. (3) In the case where Ra = RL, eqn. (3) reduces to the more common expression G = 20 log10 dbs. (4) or G = 20 log10 dbs. (5)
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Although these equations are only strictly valid when RL = Ra, they are often used when the condition is not satisfied. Resistance matched attenuators can be cascaded in series, with the input resistance of each attenuator appearing to equal the resistive load, to result in an net attenuation that is the product of the individual gains g = 1 2.
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Lab 2 Report - EE01LA Experiment 2 Attenuation & Power...

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