Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [reference]

87 questions
13
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3 answers

Copyright of reference designs?

I have been reading a design guide by TI which provides full schematics for their reference design seen Here. There is copyright stamped all over this document as seen below. I don't plan on using their design but it made me think, what if I wanted…
user160063
5
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1 answer

What do decimal/alphanumeric suffixes after a slash mean in a schematic cross-reference?

I'm looking at a circuit diagram for the ChipWhisperer, which is a tool for power analysis and glitch attacks. You can grab the full circuit schematic as a PDF, but here's an excerpt: What do those alphanumeric suffixes mean after the slash in the…
Polynomial
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4 answers

Capacitor after Voltage Reference "for stability"

I've got a lot of experience with rather "low-level" electronics (resistor networks, passive filters, basic op-amp circuits) and some experience with higher-level stuff like micro-controllers, but I am currently struggling with learning the bits in…
Magic_Matt_Man
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1 answer

MOSFET Temperature coefficient

I'm reading a paper by Guillermo Serrano and Paul Hasler, A Precision Low-TC Wide-range CMOS Current Reference, IEEE JSSC Vol 43, no 2, Feb 2008. Link to paper - requires subscription to IEEE Xplore to acces In this paper they use the temperature…
Joren Vaes
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5
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Why is it a bad idea to divide reference voltage only with resistors instead of using an op-amp buffer?

I'm planning on shifting the output of an AD8226 instrumentation amplifier by 'about' 0.5 volts using a 2.5 v precision reference and a voltage divider. According to the datasheet this is a bad idea and a buffer must be used: I understand that if I…
hadez
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3 answers

Obtaining a -3.3v with +3.3v and ground

I have a +3.3V supply and ground through usb on a board. I want to get a -3.3v supply from it for giving reference to an adc. Do you know how to do it?
Rick_2047
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4
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3 answers

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 glitch of my initially chosen DAC, the DAC8830 from…
Mau5
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4
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2 answers

Resistor in shunt regulator not following Ohm's law?

I was reverse engineering a power tool battery charger (21V SMPS) that derives its 5V rail from a simple shunt regulator, employing a TL431 programmable precision reference and a NPN transistor, as per my crude sketch (sorry I didn't have time to…
parkside
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What are some good Electrical and Electronics blogs worth following?

This is a soft question. I am newly admitted to Electronic and Electrical engineering . Under this branch there are multiple domains from which I may work in one of them in the future. For knowing where is my particular interest in one of such…
user3559780
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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 not seeing more information about other best…
matt.han
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1 answer

Is there sufficient 'ambient hum' to obtain a 60/120 Hz reference wirelessly?

In a typical urban (USA etc) setting, we seem to be awash in 'powerline hum'. Has it been done, or could it be practical, to recover this to get a wireless reference for a battery-powered system, like a clock, for example? How rural would a site…
Jim Mack
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Should ADC reference pin also be a kelvin connection?

Reasking this question with a proper schematic: I am doing a ratiometric measurement of a Thermistor. The thermistor is located over 5 metres away from the ADC and all other components. This is going to be a resistance of the cables of upwards of…
AQUAMAN
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3
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1 answer

3V ±0.1% reference

I've been looking for a 3V ±0.1% reference in a SOT-23 package to replace my current ±0.5% solution of a TL431 and about 5 passive 0603 components. At the moment I've found LM4040A30 which is $1 at 1ku, and comes in a SOT-23 package. It also…
Thomas O
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3 answers

Self Biased Current Reference

I'm studying this circuit: The author of my book says that the purpose of this circuit, called "Self Biased Current Reference", is to generate a current almost independently of the supply voltage. He also says that, if M3 and M4 are perfectly…
Stefanino
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How to connect a diy audio signal to my "expensive" audio interface

I'm a hobbyist and after some experimentation (around 4 years) I want to connect my signals I create on the breadboard to my expensive audio interface. Until now I was using the "mic" input on my laptop to connect the signals and I haven't damaged…
John Am
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