Questions tagged [offset]

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5
votes
1answer
655 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
431 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
1k 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
408 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
1answer
276 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 (...
3
votes
2answers
874 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
486 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
1k 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
302 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
3answers
2k 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 ...
2
votes
1answer
1k 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
2answers
105 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
2answers
1k 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
2answers
743 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
1answer
274 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
0answers
360 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
373 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
2k 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
1answer
2k 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
vote
2answers
269 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
vote
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
3answers
64 views

Why does the bias decreases in this clamper circuit?

I'm trying to do a positive clamper circuit in easyeda.com to bias a triangular signal of 200mV pk-to-pk at 1kHz centered around 0V. Here's the circuit: The bias seems to work only during the first ...
1
vote
2answers
60 views

Large signal with DC offset matching to ADC with input centered around 0V

I'm new to this forum, so plear bear with me. I have a 0 to 23v signal coming from a transimpedance amplifier that I need to squeeze into -2.5v to 2.5v input for an ADC. The signal is first put into ...
1
vote
1answer
132 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
3k 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
2answers
219 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
813 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
1k 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
293 views

Ground offset test

I need to perform a ground offset test. Ground offset = 1V Please tell me whether my approach is correct. Typ Input power supply to the circuit is +12V Typ Load current for the circuit is 0.5A So, I ...
1
vote
1answer
141 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
67 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
790 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
619 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
440 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
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0answers
33 views

Rressure sensor offset removal

I have a pressure sensor that has 200 mV offset. I wanted to remove this offset and double the result (to remove any present noise) so that be able to calibrate the sensor easier. So far I have used a ...
1
vote
2answers
42 views

Help selecting feedback and ground resistors for a gain and offset circuit

I have an input signal from -3.3V to 3.3V and the ADC I would like to use can only read from 0 to 3.3V. I also have access to a stable source of power at 3.3V. From previous visits, I have tried to ...
1
vote
0answers
86 views

PIC ADC Protection

I am working on a project that samples a 1 kHz signal @ 20 kHz, the signal is 5Vpp biased on +2.5V that way everything is fine. I want to make a protection schematics to work along my offset. I am ...
1
vote
1answer
63 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
1answer
860 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 ...
1
vote
0answers
231 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
190 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
999 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
7k 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
7k 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
1answer
67 views

Attenuating op-amp circuit with offset

I am designing a non-inverting op-amp circuit that maps an input signal (V3) 0-3.3V to an output signal (Vo) 0.2-2.4V. I opted to offset the output up by 0.2V and then used a second op-amp circuit as ...