Lecture30-Differential Amplifiers

Lecture30-Differential Amplifiers - Lecture 30 Differential...

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ECE 3040 - Dr. Alan Doolittle Georgia Tech Lecture 30 Differential Amplifiers Reading: Jaeger 15.1-15.3 and Notes
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ECE 3040 - Dr. Alan Doolittle Georgia Tech Differential Amplifiers •To implement the operational amplifier, we need to have a circuit that can amplify the difference in two signals •This can be used to remove unwanted signals common to both sources, such as: •Noise picked up on the input terminals. • Example: twisted pair telecom line: Both lines are exposed to the same noise sources. Thus, there is unwanted noise superimposed on the desired signal (voltage across the pair). We would like to amplify the desired “differential signal” while not amplifying the noise “common to both wires”.
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ECE 3040 - Dr. Alan Doolittle Georgia Tech Differential Amplifiers The differential output voltage, v OD , (difference in two collector/drain voltages) is the amplified difference of the two input signals v OD =A v-d (v 1 -v 2 )
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ECE 3040 - Dr. Alan Doolittle Georgia Tech Differential Amplifiers Q-Point:
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This note was uploaded on 08/23/2011 for the course ECE 3040 taught by Professor Doolittle during the Spring '11 term at University of Florida.

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Lecture30-Differential Amplifiers - Lecture 30 Differential...

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