Questions tagged [offset]

The tag has no usage guidance.

Filter by
Sorted by
Tagged with
1 vote
2 answers
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?...
mengqimusic's user avatar
1 vote
1 answer
280 views

ADS1230 shows a large offset

I'm using an ADS1230 for measuring the output of a pressure sensor (MPXM2053). The schematic of the circuit is shown below and some voltages are as follows: AVDD = 3.304V DVDD = 3.304V Common-Mode ...
Kamin's user avatar
  • 121
1 vote
1 answer
154 views

What are the disadvantages of using an adder instead of a clamper?

I must use an offset an AC signal to measure through ADC. The traditional way or most of the resources point me to use the following clamper circuit: However, I also see that the following adder ...
SKGadi's user avatar
  • 862
1 vote
2 answers
619 views

Low pass filter offset voltage question. LM358, INA129

I am designing a low-pass anti aliasing filter. I have set my cutoff frequency to be at 500Hz, and my sampling frequency at 1000Hz, but I'm not that far yet. I designed a 4th order butterworth low-...
Punchki's user avatar
  • 143
1 vote
1 answer
497 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 ...
Stefanino's user avatar
  • 616
1 vote
1 answer
102 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 ...
electronic component's user avatar
1 vote
1 answer
2k views

Amplifier Gain and Offset (Positive m and Negative b)

My question is regarding gain and offset of an amplifier. simulate this circuit – Schematic created using CircuitLab I've used various references however I believe the circuit I want to build ...
cylus's user avatar
  • 13
1 vote
1 answer
787 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
VIPPER's user avatar
  • 356
1 vote
1 answer
633 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 ...
PsychedGuy's user avatar
1 vote
0 answers
68 views

Opamp circuit (amplifier with offset) degrades analog signal

I'm trying to amplify and offset a voltage from an DAC (0V to 3.3V) to -5V to +5V. For this, I'm using a opamp (LM358) with dual power supply (-15V , +15V) with an offset and amplifier configuration. ...
Christoph Madl's user avatar
1 vote
1 answer
234 views

How to trim offset of a folded cascode op-amp when different voltage in applied to the input portion?

When the common mode input voltage is varied, offset is also varied. How can I trim them without using any pot?
K. M. Sayem Bin Rahmotullah's user avatar
1 vote
0 answers
157 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 ...
V.Ajall's user avatar
  • 71
1 vote
2 answers
211 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 ...
Old Guy's user avatar
  • 11
1 vote
1 answer
3k 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 ...
user avatar
1 vote
0 answers
107 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 ...
Luis J. Rodríguez's user avatar
1 vote
1 answer
119 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 ...
pnatk's user avatar
  • 1,422
1 vote
1 answer
3k 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 ...
rrz0's user avatar
  • 1,181
1 vote
0 answers
259 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 ...
Gomu's user avatar
  • 243
1 vote
1 answer
459 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 ...
user107585's user avatar
0 votes
3 answers
1k 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% ...
Jolle's user avatar
  • 537
0 votes
1 answer
97 views

Amplification of the oscillation of a signal without amplifying the offset

Knowing that I only have op-amps, comparators, resistors, capacitors, and simple diodes at my disposal, is there a simple way to amplify the small oscillation of such a signal without amplifying the ...
c.leblanc's user avatar
  • 339
0 votes
2 answers
87 views

Voltage-controlled amplifier output offset

I'm testing a voltage controlled amplifier circuit in a simulator. The circuit is powered by a single 9V supply, so a "virtual ground" equal to 1/2 VCC is used. I have a question about the ...
Alex_G's user avatar
  • 25
0 votes
1 answer
37 views

what's thsi register Address: "16’b11_0_1_0nnn_0001_0011" stands for?

I'm learning a "PHY full rate clock divider configuration register" and it represents its register Address as 16’b11_0_1_0nnn_0001_0011 I think 16 stands for bit number, ...
Chen Li's user avatar
  • 115
0 votes
2 answers
651 views

Add an offset of 2.5 V to analog signal

I can't add an offset voltage 2.5 V to my analog signal. The circuit is attached.
Selim Ulusoy's user avatar
0 votes
1 answer
428 views

How to measure only the true RMS AC component of the waveform in an ADC?

I need to read an AC signal on an ADC. I have already conditioned the signal with an offset of 2.5V, which will vary from 0 to 5V. How to calculate the Vac true RMD voltage of any signal (sinusoidal, ...
hikoruKazuto's user avatar
0 votes
1 answer
281 views

Small output offset in square wave generator using LM741

I am building a square wave generator using LM741 just like in this Falstad simulation. My problem is that the output has a small offset and I don't understand where it comes from. When measuring ...
PowerTb321's user avatar
0 votes
2 answers
241 views

Sinking and sourcing problem for buffer

Let's assume that I am using a buffer for a sensor output (V1) in the kHz domain. The output of the buffer will be ideally equivalent to the sensor voltage. There will ideally be no current coming out ...
Tungstein's user avatar
0 votes
2 answers
2k 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 ...
Sørën's user avatar
  • 299
0 votes
2 answers
12k 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 ...
user203's user avatar
  • 39
0 votes
3 answers
1k 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 ...
Jon's user avatar
  • 75
0 votes
1 answer
206 views

Control (0 - 10 V) fan from LM358

I want to generate output of (0 - 10 V) from ESP32 GPIO (0 - 3.3 V). Basically fan is connected to the output. I am attaching a circuit of it. Do I need any changes in the design or it will work? Will ...
Zunuran Nasrullah's user avatar
0 votes
2 answers
333 views

Offset adjustment with unity-gain buffer

I want to include to my design an 'variable offset adjustment' circuit using an operational amplifier. This circuit would allow me to ajust the offset of my design. In my circuit, I already has a ...
Developing Electronics's user avatar
0 votes
1 answer
750 views

Confusion regarding term "offset"?

I am confused regarding term "offset". What is its meaning in context of function generator and oscilloscope? I have tried to google, but I get results in context of op amp and some results ...
DSP_CS's user avatar
  • 1,223
0 votes
1 answer
352 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 ...
illancha's user avatar
0 votes
2 answers
461 views

How to remove/trim MCP4725 DAC offset? [duplicate]

I'm using MCP4725 (datasheet) module, VCC is connected to a 4096V reference voltage. there's a steady 23mV offset: 0 - 23mV 50 - 73mV 100 - 123mV ... How can I ...
ElectronSurf's user avatar
  • 2,346
0 votes
2 answers
1k views

Adjusting the offset of the output of a UA741CN opamp

I've the following schematic for a UA741CN when there is NO offset: simulate this circuit – Schematic created using CircuitLab Question: Why do we need the diode and the two resistors to ...
Looper's user avatar
  • 331
0 votes
3 answers
437 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, ...
Nick Ashforth's user avatar
0 votes
1 answer
125 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: ...
Venkata Rahul S's user avatar
0 votes
1 answer
1k 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 ...
Felix S's user avatar
  • 798
0 votes
3 answers
2k 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?
user avatar
0 votes
2 answers
525 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. ...
user16307's user avatar
  • 12k
0 votes
1 answer
40 views

Scale and offset voltage range from DAC to VCA

Still tinkering with my VCA based effect mixer. I control multiple DACs (MCP4922) which send control voltages to the VCAs (AS2164). Until now I've just fed the DACs a reference voltage of 3.3V to ...
Jesper Kragh's user avatar
0 votes
1 answer
144 views

How to add an offset to a PWM signal to control a N-channel MOSFET that has a large source voltage?

I want to control a N-channel MOSFET through a PWM signal generated by an Arduino board. The amplitude of such PWM is 0V-5V with respect to GND with frequency 20kHz. My idea is to send the PWM signal ...
Barzi2001's user avatar
  • 113
0 votes
1 answer
135 views

DC offset charging using battery's own voltage?

Pardon my awful drawing, I also omitted any voltage regulator going into the battery for simplicity. I have an extremely low (0-1.25V) "generator" DC source that raps up to that voltage and ...
baraka's user avatar
  • 1
0 votes
1 answer
245 views

How to size a differential amplifier for minimal offset?

What is the strategy for optimizing the offset of the differential amplifier in addition to increasing the size of the cross-coupled transistors? Are there any sizing rules to follow to size the ...
Gnawi's user avatar
  • 1
0 votes
1 answer
223 views

Need help calculating current and understanding Vos in an op amp

I'm trying to solve a circuit that uses an op amp with a +-4mV offset but I've run into two problems trying to find output offset voltage. When looking at the solution to the problem, I noticed that ...
Johanis's user avatar
  • 47
0 votes
1 answer
216 views

Electret microphone weird offset problem

Hi I am trying to amplify my output from electrec (analog microphone) with below design. When I used 1uF capacitor it has -300mV offset, so that I changed capacitor to lower value with trial-error ...
U.Deniz A.'s user avatar
0 votes
1 answer
41 views

Why is input offset current halved? [closed]

I am reading a data sheet that has offset current at 200nA, however, some calculations are using the total offset current. Why does the op-amp image below half the Offset current? Datasheet
Roo's user avatar
  • 541
0 votes
1 answer
308 views

Waveshare ADC Board changing analog input range [duplicate]

This question has been redirected from raspberry pi community. Some of the questions have been answered by @Milliways, so those questions have been edited out. I'm using this Raspberry Pi High-...
Jihun Kim's user avatar
0 votes
1 answer
99 views

Automatic offset adjustment

I have a signal which can have a different offset voltage based on the requirements. However, I need the voltage to start at zero. Since the offset is variable, I was hoping if there are any ...
Navaro's user avatar
  • 922