Linked Questions

19
votes
3answers
12k views

How do you choose an inductor for connecting separate ground planes?

On a board with separate analog and digital ground planes connected at one place, the connection is often made with an inductor. How is this inductor chosen? Obviously it has to be able to handle ...
10
votes
2answers
3k views

Grounding of ADC grounds

Fast, high resolution ADCs, especially ones that have parallel output, usually have a separate supply pin (DRVDD, (drive vdd) or OVDD (output vdd)) presumably because they don't want to couple noise ...
6
votes
2answers
1k views

How on earth shall I design the ground planes for mixed signal circuits, split or not?

Our circuit is like following: There are four layers, including top, power, ground and bottom. My way of grounding: I follow the instruction by Maxim: https://www.maximintegrated.com/en/app-notes/...
6
votes
2answers
989 views

Why do TQFP and TFQN have different advice regarding analog ground?

This question is in reference to How to split Analog and Digital GND planes for a TQFN device. For the PSoC3, the advice on how to separate the analog and digital ground is different depending on the ...
2
votes
2answers
431 views

AGND and DGND connection using flash ADC, totally stumped

So, I am designing a PCB with the classic scenario of having both sensitive analog signals and noisy digital signals... Analog and digital regions are separated. the have their own gnd planes and ...
1
vote
3answers
625 views

Where should I connect power ground and control ground for a switched power regulator?

I'm trying to wrap my head around the concept of separating control grounds and power grounds for a switch mode power supply. I'm trying to use this TI chip in a design for regulating 3.3V, and I've ...
1
vote
1answer
361 views

How to create a mixed signal pcb

I want to create a board that has both high speed digital components (specifically the SAM3X8E - from arduino DUE) and an analog audio circuit. The analog parts were originally a shield to the ...
1
vote
2answers
188 views

Separate grounding for analog and digital portions of circuitry

A datasheet suggests separate grounding for analog and digital portions of circuitry (http://www.ti.com/lit/ds/symlink/am26c32.pdf#page=12). Is this to say that the IC's outputs should have a ...
1
vote
0answers
91 views

Confusion about GND and PGND

In a digital circuit like a cell phone. If a switching ic has it’s reference point as PGND, separate from the main GND (4v Main vcc coming from battery), but they’re tied together, then What exactly ...
0
votes
1answer
52 views

Correct way to ground components for solar panel measurement

I'm currently doing a project where I'm supposed to measure the current and the voltage from a solar panel and am unsure of how I should ground all the components in the circuit (since electrical ...