Questions tagged [offset]

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Auto-zero technique in multi-stages architectures

I'm studying auto-zero techniques. Let's consider the following circuit: During phase 1 we have a buffer, thus the inverting terminal ideally becomes equal to the offset voltage, which becomes the ...
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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 ...
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2answers
51 views

Active band pass filter + offset

I'm trying to know the fr equation for the following op amp configuration: I have some capacitors values for specific fr frequencies: fr = 34Hz -> C = 33nF fr = 50Hz -> C = 22nF fr = 160Hz -> C = ...
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1answer
147 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 ...
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2answers
93 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 ...
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1answer
73 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 +...
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0answers
45 views

Negatively offset signal on op-amp

I am simulating the use of a tl074 quad op-amp and i have configured one of the op-amps as a non-inverting op-amp, where R1=1 Meg and R2=4 Meg and the supply voltage is 9V. Every time i put a signal ...
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1answer
29 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
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1answer
60 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-...
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1answer
56 views

Remove bridge offset before ICF amplifier or at FB pin?

I'm making project where I would like to read from stain gauge sensor. It will use only one 1k ohm (or 350 ohm) strain gauge and 3 dummy resistors to complete bridge (1k or 348 ohm). I'd lik to feed ...
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1answer
103 views

where to connect the offset nulls in a comparator circuit [closed]

I made this circuit but no matter what the input Voltage is, the output stays high and the led lights. Is it because of the offset voltage ? And where to connect the offset nulls to make the output ...
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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 ...
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3answers
832 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 ...
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1answer
509 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
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2answers
48 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 ...
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1answer
198 views

Application of offset voltage to non-inverting input of the op amp

When we analize the effects of the offset voltage at the outlet of an amplifier configuration, we consider that this voltage is applied to the non-inverting input. At least it appears so in all the ...
4
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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 ...
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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 ...
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2answers
474 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 ...
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3answers
128 views

How to get rid of sawtooth offset

I have a sawtooth oscillator, and I am trying to get it so that there is an average voltage of 0, so that I can later waveshape. Any idea how I can achieve this? UPDATE: I have added a filter to the ...
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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 ...
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1answer
559 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
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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 ...
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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 ...
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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 ...
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2answers
571 views

Why doesn't a resistor on the non-inverting lead of the op amp affect dc offset (non-inverting amplifier)?

Why doesn't a resistor on the non-inverting wire of the op amp affect dc offset (non-inverting op amp)? And does it have any effect on the dc offset of the inverting amplifier. The reason I ask is ...
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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, ...
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1answer
138 views

Current Sensor Callibration

I want to measure a low current (from 0 to 75mA) using the attached schemtaic for ACS712. The ACS712 sensitivity is 185mv and I want to use the max gain of 47 to input vout to a microcontroller(0-...
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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 ...
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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 ...
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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: ...
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1answer
393 views

What is meant by “adjustment of the output gain and offset” of a Force Sensitive Resistor interface circuitry?

A FSR (Force Sensitive Resistor) is a sensor which lowers its resistance when there is force upon it. At idle state (no push force) it has a high resistance (~ MOhms) Interlink Electronics has ...
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2answers
898 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 ...
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2answers
414 views

Signal with little amplitude and offset in LTSpice

i have a problem trying to work with a signal whose amplitude is in nanovolts and has an offset of 1V. LTSpice doesn't plot the amplitude because is too small in comparation to the offset (the ...
2
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2answers
898 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 ...
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1answer
730 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 ...
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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 ...
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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 ...
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2answers
597 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 ...
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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 ...
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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 ...
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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 ...
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1answer
109 views

Choosing differential receiver IC?

I have a differential signal A which I would like to convert to LVTTL output X as follows: X = 1 iff A+ > A- + 50 mV. That is to say, X is '1' only when A+ is more than 50 mV greater than A-. ...
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1answer
129 views

What is the role of the resistor at the input of the OpAmp? [duplicate]

Could anyone explain the role of resistor R1 in the circuit below? Thank you.
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2answers
130 views

What difference will it make on the output between these two circuits?

In the above image there are two figures, Fig(a) consists of force sensor connected to a resistor in a simple voltage divider configuration, and its output is fed to an ADC. Now coming to Fig(b), its ...
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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 ...
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2answers
238 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 ...
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2answers
893 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 ...
1
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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 ...
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3answers
733 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?