# WVU EE 551 - Differential Circuits (4 pages)

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## Differential Circuits

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## Differential Circuits

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Pages:
4
School:
West Virginia University
Course:
Ee 551 - Linear Integrated Circuits
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Differential Circuits Dr David W Graham West Virginia University Lane Department of Computer Science and Electrical Engineering 2010 David W Graham 1 Single Ended vs Differential Ended Single ended signals Referenced to a fixed potential usually ground Differential signals Measured between two nodes that have equal and opposite signal excursions about a fixed potential The two nodes must have equal impedances to that fixed potential The fixed potential is called the common mode CM level Generally a signal is defined as the difference between V1 and V2 V1 V2 V Vid 1 8 1 6 V1 1 4 1 2 Voltage V V 1 cm 0 8 0 6 V2 0 4 0 2 0 0 0 1 0 2 0 3 0 4 0 5 Time s 0 6 0 7 0 8 0 9 1 2 Advantages of Differential Circuits Common Mode Rejection Rejects environmental noise noise produced by the environment or other circuits This noise will be common to both signals and will eventually be subtracted out Power Supply Rejection Reduces the noise contributed by noisy power supplies Increases doubles the maximum achievable voltage swings Increased Linearity Removes even order harmonics in fully differential systems Typically simpler to bias 3 Costs of Differential Circuits Increased area In reality the benefits far outweigh this minor detail Single ended circuits may consume more area to achieve the same performance Twice the power consumption Similar concepts as above 4

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