Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [voltage-reference]

Anything related to the design and implementation of voltage references, i.e. circuits behaving like fixed (constant-value) voltage sources whose output voltage can be deemed very precise, accurate and stable. Voltage references are not meant to provide significant current to external circuits.

Anything related to the design and implementation of voltage references, i.e. circuits behaving like fixed (constant-value) voltage sources whose output voltage can be deemed very precise, accurate and stable over a wide range of environmental conditions, most commonly temperature and time.

Voltage references are usually not intended to be heavily loaded, i.e. they are not meant to provide significant current to external circuits. Where significant current is needed at a very precise voltage, a voltage reference can be used to drive a buffer circuit whose output is connected to the load.

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What do you need 1.018V for?

The Fluke 732A has among 10V and 1V references also a 1.018V reference (whereas the 10V is the "main" references and the others are formed by resistive voltage dividers). While having multiple reference voltages is surely convenient, why exactly…
PlasmaHH
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Why use 2.048V and 4.096 as a reference?

On many voltage reference ICs (As an example a MAX610x) there seems to be various different reference voltages available (1.25, 1.8, 2.5, 3.3 etc). What strikes me as odd are the 2.048V and 4.096V references. Why do we use references at those…
MCG
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(TAoE) JFET voltage reference derivation

I've been reading the Chapter 9 of The Art of Electronics, 3rd ed., and apparently the equation I derived for the following circuit is wrong. My reasoning follows. Vout is the sum of the contributions coming from \$I_{PTAT} * R_1\$ and from the…
tfm
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What half-bandgap voltage reference is?

I came across term "half bandgap voltage reference". I expect it is somehow related to bandgap circuit. Do you know what it is, know its schematic or principle of operation?
mazurnification
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Using positive voltage reference on a negative supply

Got a 9V,0,-9V power supply and want to get two stabilised voltage references at 2.5V and -2.5V. Is it possible to use a +2.5V reference chip "upside down" to supply the -2.5V?
Dirk Bruere
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Can I cascade voltage references to get better stability?

is it possible to get higher output voltage "stability" by cascading voltage references? -- REPHRASING -- Suppose I have IC1 and IC2. Both are 0.5% accurate TL431 parts. IC1 takes 15V and outputs 12V. This is fed to IC2 and IC2 outputs 5V. Will the…
Vishal
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Does initial accuracy tell us anything about output voltage drift with reference voltages?

Consider the ADR421. From the data sheet the initial accuracy is shown to be + or - 3mV of the nominal (2.5V). I understand that if you power on one of these chips with conditions at 25 degrees C, Vin = 5-15V, you will expect output in that initial…
BobaJFET
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Is there any use of a 65 mV reference voltage?

I am a senior studying electronics, and have happened to make a bandgap reference circuit that gives out an output reference voltage of ~65 mV. I've constructed this after quite a few months of research and simulations alongside my mentor. I wasn't…
Akshar Gandhi
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LM4040 Shunt Voltage Reference Functional Diagram Explanation

Could you help me understand how this shunt voltage reference circuit operates? Cathode connects to Vin while Anode typically connects to ground (unless floating). This circuit is from the LM4040 datasheet.
RayaneCTX
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Voltage drop by reference voltage generated by zener diode

I am now designing a circuit looks like this: simulate this circuit – Schematic created using CircuitLab My goal with this circuit is to compare the input digital signal with a reference signal generated by zener diode D1, so that the result could…
Zongyi Wang
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What is voltage trimming in bandgap references?

I just started reading about bandgap reference circuits (PTAT, CTAT generation, etc.) in CMOS and I see a lot of papers about something called trimming in relation to these. What does it actually mean and why is it used?
AlfroJang80
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Building a 2 V reference with 100 mA output

Consider I have a 2.048 V reference voltage, for example, I build this voltage with an REF191. This IC has only 10 mA output current. How can I boost this current to 200 mA? Is there any better way to build an accurate 2 V reference with 200 mA…
AqaRashid
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How do you generate a reference voltage in a circuit?

Hi Im very new to electronics and had a pretty basic question about voltage reference. So Ive finally understood that in order to check a voltage in most circuits, a voltage reference is used. The way i visualize this is a chip having 5 wires; the…
Donsa
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Is there a simpler way to create a variable voltage drop than a differential amplifier?

I am working on a preregulator circuit design (it's derived from the one in LTC AN32), and am trying to design the test fixture for it. Two of the three components are clear: I can use an AC-output wall transformer to provide a safely isolated AC…
ThreePhaseEel
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Input voltage range for lm336z-5.0?

I want to use lm336z-5.0 as a reference voltage for Arduino Uno. In the data sheet I see an example of the chip being connected to a 10V source via a 5k resistor. In Absolute Maximum Ratings section I only see that the max reverse current is 15 mA.…
Eiver
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