Class 23 - Digital Storage Oscilloscope - Part 2

Class 23 - Digital Storage Oscilloscope - Part 2:

• One of the important parameter to select Oscilloscope: Bandwidth
• Basic DSO Circuit includes:

• Amplifier
• Track and Hold Circuit
• ADC
• Acquisition circuit
• Digital Converter

ROHS - Restriction of Hazardous Substances

Class 20: ROHS - Restriction of Hazardous Substances

 

1. All the countries restriction of the Pb and other substances in the silicon and equipment.

2. Manufacturers are responsible to control design the product with in the allowable limits.

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Class 19: Balanced Differential Signalling

Class 19: Balanced Differential Signalling:

1. For Balanced transmission system, the signals should be routed close to each other.

2. Equal Length.

1. Different type differential signal routing is shown in the above picture.

•          Microstrip
•          Stripline
•          Stripline (Broadside coupled)

1. For the High speed interface it is recommended to route the differential referenced to GND on both side. (Ideal case - electrical validation boards).

2. Length matching tolerances as per the standard guideline

3. Avoid multiple vias on the paths to reduce the impedance mismatch.

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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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