ECET-220 iLab 3

# ECET-220 iLab 3 - Allen 1 Week 3 Lab Worksheet Course...

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Allen 1 Week 3 Lab Worksheet Course Number: ECET220 Professor: Jimmie Russell Laboratory Number: 3 Laboratory Title: Bipolar Junction Transistor Amplifier Circuit Analysis Submittal Date: Objectives: View and analyze the characteristics of a CE BJT amplifier Perform calculations, compare to simulation and constructed circuits Test the Common Emitter amplifier to the stated theorems Define the phase angle of the simulated and constructed circuit of a CE amplifier Results: The comparisons were all less than 10% error. The phase angle remained at 180° in all builds. This shows that this circuit is an inverting amplifier. The q-points of the theoretical, simulation, and constructed varied, due to the value of I C. Conclusions: Comparing the simulation and constructed circuits, all measurements were closely (less than 10%) related. The CE Amp had a gain of, both on the simulated and constructed circuits. This lab has proven that this circuit does have a voltage gain, as well as, a current gain. Team: Jason Allen ECET 220 Jason Allen Name Program Signature Observations/Measurements: III. A. Theoretical Analysis: Please complete Table 1. Calculations Used: V CC = 9V V BE = 0.7V ECET220 Week 3 Lab Worksheet Page 1 of 13

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Allen 2 V B = (R2/(R1+R2))V CC = (10kΩ/(47kΩ+10kΩ)×9V = 1.579V V E = V B – V BE = 1.579V – 0.7V = 0.879V I E = V E /R4 = 0.879V/470Ω = 1.87mA I C ≈ I E I C = I CQ V RC =(I C )(R2) = 1.87mA× 2kΩ = 3.74V V C = V CC – V RC = 9V – 3.74V = 5.26V V CE = V C – V E = 5.26 – 0.879V = 4.381V V CEQ = V CE = 4.381V V CB = V C – V B = 5.26V – 1.579V = 3.681V I B = I C ÷ β = 1.876mA ÷ 50 = 0.0374mA I C(SAT) = V CC /(R2+R4) = 9V ÷ (2kΩ+470Ω) = 3.644mA Calculated Parameters Voltage (V) Current (mA) Base Voltage (V B ) 1.579V - Collector Voltage (V C ) 5.26V - Emitter Voltage (V E ) 0.879V - Collector-Emitter Voltage (V CE ) 4.381V - Base-Emitter Voltage (V BE ) 0.7V - Collector-Emitter Voltage @ Cutoff (V CE(off) ) 9V - ECET220 Week 3 Lab Worksheet Page 2 of 13
Allen 3 Collector-Emitter Voltage (V CEQ ) 4.381V - Base current (I B ) - .037mA Collector current (I c ) - 1.87mA Emitter current (I E ) - 1.87mA Collector current @ Saturation (I c(STA) ) - 3.64mA Collector current (I CQ ) - 1.87mA Table 1 III. B. 2 & 3. MultiSim Simulation: Please complete Table 2. Simulated and Calculated Parameters Voltage (V) Current (mA) Base Voltage (V B ) 1.483V - Collector Voltage (V C ) 5.599V - Emitter Voltage (V E ) 0.804V - Collector-Emitter Voltage (V CE ) 4.794V - Base-Emitter Voltage (V BE ) 0.678V - Collector-Emitter Voltage @ Cutoff (V CE(off) ) 9V - Collector-Emitter Voltage (V CEQ ) 4.794V - Base current (I B ) - 0.012mA Collector current (I c ) - 1.71mA

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