Class 18 : Differential Signalling Part 3

Advantages and Drawbacks of Differential Signalling:

Advantages of differential Signalling:

• Noise insertion to the Single ended and differential signal is shown above.
• Noise coupling will get cancelled @ the receiver for differential signal

• Differential signals are having low voltage level. So radiation level is less on the differential signal. 

Drawbacks on the Differential Signal:

• Need additional wiring.
• High cost and extra circuits 
• Additional routing requirements.

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Class 17: Differential Signalling - Part 2

Class 17: Differential Signalling - Part 2


Noise Margin in Single Ended Signals:

• Single ended signals are distorted by the spurious noise easily.
• Noise margin for the 5V single ended signals shown above.
• Noise margin is high for the single ended signals.

• Latest technology using the low voltage and high speed signals.
• Voltage gone down to 0.8V and
• Differentiall signalling is suitable for the low voltage and high speed signal requirement

Advantages of the Differential Signalling:

• Low voltage swing
• Small noise margin
• High Data rate

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Class 16: Differential signalling

Differential Signalling:

Introduction:

• High Speed Signal transmission needs differential signalling.
• Low voltage transmission of the signal needs differential signalling.
• Differential signalling needs better immunity to noise.

•  Single ended signals transmission is referenced to Ground.
• All the voltage levels measured with respect to ground.
• It needs single conductor for the signal transmission and one common ground.

• Signals are sensed based on the difference of the voltage between the two lines.
• Two conductors are required to transmit the signal + common ground.
• Two conductors should be close to each other and tightly coupled.

• Noise introduced on the differential signals are induced on the both positive and Negative signals.So on the receiver signals noise signal get cancelled.
• Better noise immunity on the differential signals.

• Few typical differential signal routing on the PCB.

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