Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [offset]

128 questions
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2 answers

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 where in others they have two, separated as input and output offset voltages,…
not2qubit
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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? (I'm beginning to realise how much my degree…
Mauvai
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4 answers

Can't exactly adjust the offset in an op-amp circuit

I'm trying to make a neat and obvious circuit for amplifying a 0-3.3V PWM signal to -10/+10V. I'm able to adjust the gain and feed the signal on the inverting end. I also want to add a 1.65V (3.3V/2) offset to the non-inverting pin so I can pull the…
Ömer Gezer
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AC coupling to center an oscillating waveform to 0V doesn't work

I have a simple sawtooth oscillating circuit that I would like to center to 0V (remove the DC component.) I have tried AC coupling but the output is still a little to high and not centered. Could someone explain me why is this happening and what…
Charles Guilbault
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1 answer

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 circuit. I have a 10kΩ pulldown resistor on one…
TokyoScarab
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DC offset of DC signal with op-amp

I have a DC signal from a DAC in the range of [0:3,3]V and want to convert it to be in the range [-5:5]V. My approach would be to scale with op-amp with gain 3 and then DC offset. I've read that this could be done simultaneously by using an op-amp.…
Ognyan Petkov
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Generating +/- voltages for biasing an opamp using a digipot

I am trying to generate a programmable bias voltage for a non-inverting opamp using a digital POT with an up/down interface as putting a micro in the circuit is not feasible. I have come across a wide variety of digipots from Analog Deivces, Texas…
LabMat
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Op-amp output voltage offset

Hi i wanted to ask what causes an offset for the following integrator setup: I`m no sure if its the virtual ground or another fundamental reason im not aware about since the signal should always be biased at 0V. If someone could help that would…
KMN
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5 answers

What is systematic offset?

I am bit confused about what exactly systematic offset is. I understood that generally offset could be due to two reasons: Random offset which could be due to mismatch in size of transistors or any other component. This will be like noise with mean…
Hari Krishna
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2 answers

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 know the input impedance of the fan, I decided to…
user16307
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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 questions below. Please correct me if I'm wrong, it's…
Denu
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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 normally surface mounts with the ports off the end…
DavidCyr2000
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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 (possibly three) inverting operational amplifier circuits.…
Vladislav Ivanov
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4 answers

Voltage multiplier operating principle with pulsating DC

I need to generate up to 2 kV by pulsing a DC 1kV source. The circuit I used is the following: Clearly, this circuit is intended for an AC input that has both positive and negative halves where as in my case I have fully positive AC input. I…
ShiroGeek
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Offset problems with charge amplifier

I have a question about designing a charge amplifier. I am currently using this simple setup for my application. As input, I can use several commercial piezo-based accelerometers. I need a pretty wide bandwidth (up to 0.1Hz). Instead of a high…
phkloth
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