Questions tagged [reference]
The reference tag has no summary.
93 questions
2
votes
2
answers
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How precise is a DVM input impedance for high-Z circuit measurements?
I'm building a resistive probe using four 10 megaohms resistors to measure the output of a high impedance (> 2Meg)/high voltage bias supply without loading it too much. The idea is that the jury-...
- 393
0
votes
1
answer
64
views
ADC measurements drop after exposure to noisy input
I have an ADS131M08 ADC that I am using to measure voltage in various positions in my industrial EV battery (all positions are above the highest cell, but at different points on busbars, before or ...
- 71
1
vote
0
answers
151
views
Is my NEO M8N GPS design true?
I have always used GPS breakout cards until now. Now I want to use the same modules in another card that I have produced more professionally. I have obtained such a drawing with the drawings I found ...
0
votes
2
answers
495
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SuperNode when there is a reference node?
i just realize i solve this circuit:
The problem asks to find Va, Vb and Vc, so i used the concept of 'SuperNode' in the V1 branch and i it got solved right (Vb=-12V, Va=14V and Vc=4V) , but ...
- 285
1
vote
2
answers
150
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Should reference plane change its potential value if a track goes to another layer?
Assume you have a four layer board.
Signal
GND
Dielectric
VDD
Signal
And you having a track in the 4:th layer. Suddenly you're using a via to go through the 4:th layer to 1:st layer.
Question
The ...
- 1,466
0
votes
1
answer
264
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What is the recommended reference for modules on the schematics?
In my schematics I often use external modules like NFC readers, USB/TTL converters, MP3 players, and so on.
They are physically connected to the PCB with a connector (for example a standard 2,54 mm ...
- 1,593
1
vote
1
answer
83
views
DDR3 U-DIMM Signal Reference Plain
I am doing the PCB layout of a DDR3 U-DIMM and I have run into a perceived gap in the JEDEC DDR3 DIMM standards and am hoping to get some input from a DDR3 SME who could clarify the Address/Control ...
- 37
0
votes
4
answers
828
views
Buck converter with external reference voltage?
I would like to have a buck converter that takes in a reference voltage, and outputs the same voltage.
This is assuming that I'm giving it a Vin that's high enough to support the output voltage that I ...
3
votes
0
answers
143
views
Are there industry standards for incorporating a 10 MHz reference signal input into a design?
Are there any industry standards for accepting 10 MHz reference input signals into PCB designs? I've read about standard power levels (as in, 13 dBm at 50 ohm input impedance) in a few forums, but I'm ...
- 31
4
votes
3
answers
595
views
Unstable voltage reference after changing DAC
I have developed a DAC-based signal generator board that I want to use to generate sine waves of different amplitudes and frequencies.
The board was working but unfortunately, the digital-to-analog ...
- 352
0
votes
0
answers
44
views
Constellation diagram of an 8-PSK modulator with \$\cos(\omega _ct)\$ as reference oscillator [duplicate]
For the figure and problem below, is my 000 input plotted correctly and has the correct phase angle in my constellation diagram?
The cos(ωct) is located on the positive x-axis since according to my ...
- 19
0
votes
0
answers
812
views
Constellation diagram of an 8 PSK with a \$\cos(\omega _ct)\$ reference oscillator
Please help me with this problem in Tomasi's book for digital modulation. After getting the summer output, I got confused about what to draw in the constellation diagram.
According to my prof, since ...
- 19
0
votes
1
answer
172
views
Reference switch: which position and NC or NO?
I have a small linear axis, which is operated with a stepper motor.
I need a reference switch to determine the position. My question is, do I run this switch as normally closed or normally open?
Also, ...
0
votes
1
answer
88
views
RDS - PLC wires
I'm an American but I'm changing some of my drawings to RDS (Reference Designation System) to make these drawings more similar to the drawings of equipment that keep coming in.
What is the proper ...
- 183
1
vote
2
answers
4k
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VREF pin of STM32F303
I am designing a custom-made board with STM32F303 MCU and some ADC chips. I have a question regarding VREF pin of the microcontroller. As far as I understood, its main function is to provide a ...
- 177