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182 Threads found on edaboard.com: Analog Ground Digital Ground
Hi elec4, this question is not possible to answer, because it depend what ground it is. Number 1 priority should be to separate analog and digital. Then to avoid that bigger switching current creates ground shifts for the micro(like from the motor commutation) or noise on the micro supply (...)
Inside an IC package, what is the purpose of ground plane. Is it connected to the backplane of substrate for biasing it. Is it useful only in high frequency RF circuits or required for low frequency analog and digital circuits also.
My circuit has analog and digital grounds. digital potentiometers are placed under analog ground. These potentiometers has SPI interface which connects to the processor in digital section. Now my questions are- 1. How to feed 3.3 VCC power (...)
I have designed a PCB (4layer) as in the image. On the bottom layer, I have the analog section and all of that is connected to analog ground. 131238 On the top layer, I have some digital lines. These are tracks that are routed on the top side of the analog area. Now how should I (...)
Hi I was looking at some material on recommendations for ADCs and came across the following: "Understanding that the primary real estate consumed on the SAR converter chip is analog, it makes sense to connect the power and ground pins on the same planes. While implementing the layout you should connect AGND and DGND to the (...)
Hi, I would like to join the analog and digital grounds at only one place in the PCB using a 0E resistor in order to reduce the noise level in the design. But i stuck up with the SMPS Negative connection with the circuit. I don't know whether i need to connect the SMPS(0V) with analog section or (...)
The observed charge injection is described as crosstalk between digital input and switch in the datasheet. Your circuit is generating maximal crosstalk because you bias the switch DC level near to ground instead of half supply. All crosstalk specification are referring to the advantageous symmetrical bias situation, so we can just say that (...)
From what I have seen and know about this, if, say digital and analog ground nets - agnd and dgnd - are connected through the metal layers (with "low" resistance), then people place dummy intended metal resistors, with very resistance, between these nets, to allow LVS to treat them as different nets even though they are (...)
Hello guys, I have reading some documentation in internet and some people recommend to use two different ground planes (AGND + DGND) but other people recommend to use just one good GND plane with the digital part and the analog part very well placed and differenced. In my last designs I have been using only one (...)
It's correct to use a 250 ohm shunt to convert 4-20 mA to 0.5-5V. But the resistor isn't connected correctly in your diagram. It has to be connected between ground and analog input pin with the sensor output current feed to junction of resistor and analog pin. You should also include the (...)
check your code and other thing make sure you have same pins in real hardware and simulations.
First of all, I'd use a four layer board, not two layers; you're just asking for trouble otherwise. Keep your analog and digital components separated. For ground plane, what I usually do is use a single plane and add cutouts to separate the analog and digital circuitry. Do a google (...)
Either voltage or current mode bias distribution has its plusses and minuses. With voltage mode you worry about ground offsets and cross-chip VT gradients. With current mode, especially very low currents (hence high net impedance) you worry about signal coupling from digital aggressors and HF power supply noise. Which of these is worse, (...)
Specs say full scale gain error is 5.2 LSbits and offset error 0.75 so worst case in theory is 6 LSbits, full scale. In practise the analog ground must not shift due to load current at the control point.
I used 0 ohm resistors many times so separate ground signals or power signals when routing PCB. For example if I have a circuit with analog ground and digital ground, on schematic use a 0 ohm resistor to connect both grounds (...)
0 V gem = 0V gemeinsam = 0V common AGND = analog ground DGND = digital ground Lotose > Lötöse = Loetoese = solder eyelet, solder lug
You forgot to post the schematic of your 555 somehow driving an LC tank. A MUX works with analog or digital signals. A shift register is digital only.
Do you know what frequency the digital noise is at, or is it more random? The only thing that comes to mind based on changing the supply voltage using a bench supply would be that the I/O drivers of something on the board aren't impedance matched well enough and are probably over/under shooting and ringing and the change of the supply rail for the
this a good design may by more than it needs. I had many problems before with high freq modulation over power especially with combined analog and digital circuits design . more safe is the better then having funny behaviour . after finishing use a scope (earthed) and measure the 24vdc and 5vdc and return of them or use a voltmeter on AC and me
A very good explanation -