Questions tagged [offset]

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5
votes
1answer
562 views

If op-amp offset trims are provided, but not needed, what is the best practise for connecting them?

I'm using op-amps with offset trims available, but not needed as they already have very low offset voltage. What is the best practise for the PCB pad connections - should they simply be left floating? ...
4
votes
1answer
381 views

YM2612 Circuit Audio Signal Offset Voltage

I've been working on a project messing around with the YM2612 soundchip and hooking it up to a microcontroller. I'm able to drive the chip, but I'm having a little trouble with the audio part of the ...
3
votes
2answers
891 views

Raise SMD parts offset above PCB

To mount an MPXV7002 pressure sensor (SMT) on a PCB, it has to be raised above the board by about 3 mm to allow the plastic tubing to be attached to the pressure ports. This is an 8-pin device that ...
3
votes
2answers
376 views

Removing offset due to PNP output

Below is the complete circuit for a PWM control output: (please left-click to enlarge) "Out" in the schematics will be directly connected to PWM input of a 3-wire or 4-wire DC fan. Since I don't ...
3
votes
0answers
82 views

What is the difference between input and output offset voltage for an opamp?

Looking at many OpAmp (and InAmp) datasheets, I find the info either confusing or lacking. For example, in one datasheet they just call something Offset Voltage ...
2
votes
5answers
332 views

Opamp non idealities

Why is the offset voltage present on the non inverting terminal? What would happen on placing it on inverting terminal?
2
votes
2answers
895 views

LTspice unlogical DC offset

I have a Problem with an LTspice simulation. Specifically, I am designing an 12V bridge amplifier. The Problem in my simulation is that there is an DC offset which partially defies logic as far as I ...
2
votes
1answer
285 views

Does input offset voltage for amplifiers remain almost same

In Op-amp datasheets, input offset voltages are specified. Does this input offset voltage remain same (no significant difference) for each IC or can it change significantly each time I use the device? ...
2
votes
1answer
505 views

How to bias(voltage offset) unity gain buffer

First post so sorry for any bad formatting. I'm trying to figure out how to bias my signal going through a non-inverting op amp with a gain of 1. Because I want a gain one just 1, it would just be a ...
2
votes
2answers
5k views

Operational amplifier parameters: Input bias current, Input offset current, input offset voltage

I've been reading about input offset voltage, bias current, and current offset for a few days now and still can't get some things straight. I'll summarize what I understand and then pose the ...
2
votes
1answer
256 views

How to deal with the opamp input offset in a circuit with multiple opamps with inputs connected together?

My question is somewhat similar to this one asked here before. I have the following circuit: simulate this circuit – Schematic created using CircuitLab The input signal is being fed to two (...
2
votes
2answers
47 views

ADC error SPICE simulation

I am attempting to do a Monte Carlo simulation of a basic current measurement circuit using SiMetrix. The current goes through a sense resistor, amplified by an op-amp and then to an ADC. I'm trying ...
2
votes
1answer
555 views

How to offset AC voltage with varying input?

I want to offset an input sine wave, while being able to adjust the input voltage. For example a sine wave of +-3 V should be offset by 1.5 V such that the sine wave never goes below 0 V. However I ...
2
votes
2answers
897 views

Adding offset voltage to sensor signal

I have a pressure transducer outputting 0-5V which is sampled by an ADC with a 0.5V minimum input voltage. I need to offset the sensor output voltage by a fixed voltage of 0.5V. I've looked at an op ...
2
votes
1answer
250 views

Adding a variable offset to a signal

I would like to add an offset to a signal to send it on a differential ADC. But i want to be able to control the value of this offset with a PWM. My sensor has a bandwidth of [1-100Hz] and i only ...
2
votes
2answers
593 views

getting rid of dc offset at input of unity gain difference amplifier

I have a question regarding how to tackle an issue i am facing regarding DC offset at the input of unity gain difference amplifier difference. Following are the details of my circuit : I use a ...
2
votes
0answers
352 views

High voltage DC offset servo

I'm working on a project and I need some assistance. I have an audio tube amplifier output stage that I need to have adjustable operating points while maintaining a DC null at the output. [![enter ...
1
vote
2answers
1k views

Filtering DC offset of a pulse train

How can I filter a DC offset of a pulse train with an RC circuit? The signal is a pulse jumping between 3.07V and 3.53V. But I need a pulse which is jumping between 0V to 0.5V. How can I filter that ...
1
vote
2answers
328 views

signal conditioning 0 to (-40) volt to 0-5 volt, arduino

I want to convert my 0 to (-40 )v signal to be 0-5 volt so that i can measure it using arduino, i want to attenuate the signal first by the factor of 8 and then shift it up by the arduino 5 volt. ...
1
vote
2answers
1k views

Class D amplifier - Offset voltage

I am working on an amplifier based on 555 triangle generator, a comparator and the IRAUDAMP1 as a guideline. My problem is that i have high DC offset voltage at the output (-1.6V). What is the ...
1
vote
3answers
1k views

Wheatstone bridge offset

I have a Wheatstone bridge but I don't know the values of the resistances in it. My excitation voltage is 5 V. But instead of having 2.5 V on each output lines I get one line at 3.3 V and the other ...
1
vote
3answers
824 views

LM324 instrumentation amplifier gain and offset problem

I want to translate a Pt100 RTD to a 0-10V range, to be read by a PLC. I designed a circuit (instrumentation amplifier) using the LM324 op-amp. It is powered using a single 12V supply.The resistor ...
1
vote
1answer
1k views

ADC STM32L476RG : Why do I have an offset when connected to 0V?

I'm working on a software solution which set the Pin PC2 to "reset state" if my input signal (connected to ADC) is above 2V. I testing my code with STM32 Studio to watch in real time the digital ...
1
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2answers
236 views

Instrumentation Amplifier REF pin maximum voltage

I'm a spanish engineer student doing my end-of-degree project. I need to remove the offset of a strain gauges bridge and i'm trying to make the calibration automatic, using a DAC (digital to analog ...
1
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1answer
2k views

How calculate the input offset current effect on measured voltage?

Here is the data-sheet: http://www.mccdaq.com/pdfs/manuals/PCI-DAS6034-35-36.pdf A data-acquisition board's differential amplifier measures a constant voltage across a resistor R1 shown in the Figure ...
1
vote
1answer
70 views

How to compute DC offset of analog circuit?

I have an analog circuit which has an input voltage range Vin of 5V - 10V and output voltage Vout. One can assume that the circuit has been simulated and a DC sweep of Vin with a range from -10V to +...
1
vote
1answer
2k views

Remapping vector table in STM32F0 (no vector offset register)

I have written a bootloader before for a STM32 that had support for the vector offset and is easy peasy. For STM32F0xx using HAL I read I need to move the vector table to ram and copy from flash. I ...
1
vote
1answer
691 views

How to compensate for op-amp offset voltage for AC current?

For simulation purposes, I know that one can setup a difference amplifier configuration and compensate for offsets for DC current by adding a voltage source on the inverting input, and adjusting it's ...
1
vote
2answers
952 views

Piezo into 0-5v ADC, with offset center voltage?

I want my piezos to have a center voltage at 2.5v for a 0-5v ADC input on Atmega328, so it can sense force in both ways - one way would be >2.5v and the other will be <2.5v. Will this circuit work?...
1
vote
1answer
49 views

Definition of the offset voltage for a single-ended op-amp

Let's consider an op-amp: The book I'm reading says that, ideally, if the voltage difference between the two inputs is zero (thus vin1=vin2) then the output voltage should be zero. However, because ...
1
vote
1answer
59 views

Why can the offset voltage of the comparator let the transition time be longer or shorter?

When\$ V_{FB}>V_{REF}\$,then the battery enter the CV mode,otherwise,battery enter CC mode,and because inherent offset voltage of the comparator, the transition from the CC stage to the CV stage ...
1
vote
1answer
174 views

Would a small pressure sensor be orientation dependent?

I'm implementing the BME280 (datasheet here) into one of our systems. My coworker swears that pressure sensors are orientation dependent. I've found from online documentation that this is true for ...
1
vote
1answer
675 views

Two-stage opamp offset voltage constraint

I have a question regarding the systematic offset voltage constraint for designing two-stage opamp. My question is : Why must Id6 equal Id7 for offset voltage constraint ? Please find below the ...
1
vote
1answer
383 views

What is the best method to compensating offset at the output of a peak detector circuit?

Brief of Application: The signal conditioning circuit developed is used to detect or capture the peak values of dynamic systems such as the impulse tools. In this application, we use an impulse tool ...
1
vote
1answer
56 views

A question on factors affecting the offset removal of an opamp circuit

I will use a function generator module which outputs 0-1V sine-wave for frequencies of interest from 0.5Hz to 30kHz importance. So my input will be 0-1V sine wave but I want to obtain an AC sine wave ...
1
vote
0answers
223 views

Accelerometer - Offset correction

I'm using the MMA8453Q for motion detection. The accelerometer is mounted such a way that when it is stationary, X & Y axes are at 0g & Z-axis is at 1g. My usecase is: A tilt across any axes ...
1
vote
1answer
564 views

Preamplifier before latch stage in comparator circuit

Adding preamplifier based on simple inverter before latch stage can improve performance of comparator by decreasing offset voltage. Can anybody explain me how it works? Best Regards
1
vote
1answer
153 views

ACPL-C79B problem

This is my first post on this forum. I have a problem with an isolation amplifier and i hope there's someone here who can help me out. Let me explain my situation. I use an ACPL-C79B from Avago to ...
0
votes
3answers
3k views

Can someone explain this gain & offset op-amp circuit?

I'm having trouble understanding the circuit in the photo below. I know that it's a gain and offset amp designed to convert 0-2.5 V range to +/-10 V range (hence it has a gain of 8 and an offset of -...
0
votes
3answers
890 views

The best way to trim a wheatstone bridge digitally?

I am building a Wheatstone bridge for strain gauge measurement. Due to component deviations a wheatstone bridge will often show an offset which needs to be trimmed: If we assume that we're using 5% ...
0
votes
2answers
1k views

Accuracy error of ammeter from specification : is it really just a constant offset?

On ammeter specifications it is often written accuracy specification $$ (....\% rdg+ ... digits) $$ While the ammeter can have a certain last digit on the screen, which determine the resolution if ...
0
votes
2answers
5k views

How to add DC offset to a sine wave (so from -2.5V - 2.5V to 0V - 5V)?

I have a sine wave with a minimum peak of -2.5V and a maximum peak of 2.5V. I want to add a DC offset of 2.5V (using a separate power supply so no positive clamper) in order to get a sine wave between ...
0
votes
1answer
6k views

Offset an input voltage of -2.5V - 2.5V to 0V - 5V? [duplicate]

I have a circuit input which provides a voltage range of negative 2.5 volts to positive 2.5 volts. How do I change this so the output voltage is 0 - 5 volts? simulate this circuit – Schematic ...
0
votes
3answers
132 views

Offset in frequency doubler design problem

I designed a simple low frequency doubler, but I'm having trouble fixing the offset of my output signal. Below is my LTSpice model: On the graph you see my green input signal, blue inverted signal, ...
0
votes
3answers
723 views

Help me modify this level-shifting circuit

I want to modify this circuit to output a 0-5V triangle wave. It is currently configured to level shift a 5-10V triangle wave to +/- 10V (for use in other parts the circuit), and the triangle wave ...
0
votes
1answer
84 views

Scenario in which the opamp Input offset voltage is more than inverting input?

we are designing a circuit with inverting inputs in the order of millivolts. The aim is to build an amplifier so that the signal can be raised to a digital level (3.3V) Now, the question is this: ...
0
votes
1answer
728 views

How to correctly wire LF356 JFET Opamp as amplifier?

I have a circuit in which a square wave with smaller amplitude should be amplified with an opamp. Before, I used a MAX492 which has G/B-product of 500 kHz. With this circuit I manage to easily amplify ...
0
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3answers
731 views

Why do ideal Op-Amps have zero offset voltage?

Why does ideal operational amplifiers have zero offset voltage? Is that because it has infinite gain?
0
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2answers
357 views

A confusion about error components in a data acquisition system

My question is related to my previous question:Accuracy of a data acquisition hardware In a data acquisition system absolute accuracy is defined as measure of all error sources as following: Abs. ...
0
votes
1answer
138 views

What is offset in oscilloscope?

What is offset in oscilloscope or what does it represent? "The signals are shifted from the horizontal middle line of oscilloscope's display and this is because of offset's presence." What does ...