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Finding total return loss between transceivers

Return loss is the magnitude of the signal being reflected back from the connector, its phase is undefined. You might expect two identical connectors to have the same phase of return loss, and so two -...
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Finding total return loss between transceivers

Return loss can be equated to reflection coefficient like this: - $$RL =-20\cdot \log_{10}(\Gamma)$$ And \$\Gamma\$ (the reflection coefficient) equals: \$\hspace{1cm}\dfrac{Z_{LOAD} - Z_0}{Z_{LOAD} + ...
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1 vote

How to calculate the maximum cable length for SerDes using data isolator component?

The data sheet says this on page 20: - The ADN4654 provides the galvanic isolation required for robust external ports, and the low jitter and high drive strength of the device allow communication ...
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5 votes

Single point grounding VS Uniform ground plane

I think I have read/seen too many articles pointing out why having a single uniform ground plane is the superior grounding strategy in comparison to split ground planes or irregular ground planes, and ...
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4 votes

Single point grounding VS Uniform ground plane

As you stipulate no GND plane in the 2nd case, and also do not indicate bypass capacitors, the current loops look like so: There is considerable mutual flux between these loops; even if the areas ...
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2 votes

Single point grounding VS Uniform ground plane

Scenario 2 has the big drawback that the long trace must be considered as an inductor, especially if IC A switches high currents. So there will be a lot of radiated noise, that other traces may ...
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3 votes
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PCB trace as transmission line: rise time vs propagation delay

If the rise time is less than the propagation delay, and the line is not terminated ... The destination will overshoot, then undershoot, etc. This is often called ringing. Therefore, the signal will ...
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4 votes
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Can you use a MagJack for isolation of RS422 for something like UART?

Would this setup work? Almost certainly not. All Ethernet data bitstreams are encoded to give them an average value of 0 V. IOW, the line signal has no DC component. The bitstreams in and out of a ...
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1 vote

Can you use a MagJack for isolation of RS422 for something like UART?

No, it will not work, as contrary to your understanding, UART does have a DC component. Other RS-422 interfaces, which use a DC-balanced line code such as Manchester or bi-phase can use transformer ...
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0 votes

Microstrip to Stripline Ref Plane Continuity

Would a GND/VCC referenced stripline transitioning to a GND referenced microstrip appear as a significant discontinuity of the VCC plane after going through the via transition? Or would it be ...
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10 votes
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Which is better for signal integrity in a two layer PCB? Two ground planes or one power and one ground plane?

If a 2 layer PCB is your only option: make the second layer ground and route your signals and power on the first. A proper ground/return plane is key for every signal and avoid sharing of the return ...
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7 votes

Which is better for signal integrity in a two layer PCB? Two ground planes or one power and one ground plane?

A 2-layer PCB will be insufficient for fast signals when the design is dense using recent tiny surface-mount chips. On a 2-layer PCB, you won't have the luxury of having a power plane and a ground ...
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