Questions tagged [input-offset-voltage]

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Does the input offset voltage of an opamp remain same after each power up?

If we have an opamp and we know the input output relation we can obtain a linear function even though there is input offset voltage. In the above situation as long as we know Vio, and since resistors ...
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3 answers
89 views

Op-Amp integrator with offset voltage output time function

I am studying the function of an Op-Amp integrator with offset voltage that is in the picture below: I have derived the output voltage formula myself, but I am not sure if it is correct. The formula ...
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4 votes
3 answers
763 views

Which op-amp parameter indicates the minimum amplificable voltage?

I'm a newbie trying to measure μV-range voltages using cheap op-amps, with some software calibrations or error corrections, for education and practice. At first, I looked at some op-amp datasheets and ...
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1 vote
7 answers
300 views

Where has this current gone in my current-voltage converter?

Everybody knows what a "current to voltage" converter is, a basic application configuration for op amps. This is a very level basic question. See the picture. What is wrong? Have I missed ...
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2 votes
1 answer
79 views

Op-amp offset voltage and capacitive coupling

About the circuit above, I can't understand from the row "VA=2Vos". If that's because most of the voltage between 1K ohm resistor and capacitor is on 1K ohm then I can't understand why VA ...
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0 votes
3 answers
65 views

Operational amplifier input voltage [closed]

I give the same voltage to opamp inputs (AD 744) but the output depends on the Vcc value. Vcc voltage is 8.00V, the output voltage is going to 7.36. Vcc voltage is 6.00V, the output voltage is going ...
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-7 votes
2 answers
135 views

How to give op amp's negative supply a slight negative offset in a simple way? [closed]

I'm trying to go over the problem of the rail to rail limitations of my op amp to get a full reading range over a current sensor and I thought offsetting the negative supply just of the op amp IC ...
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0 answers
46 views

Offset of amplifier input voltage of shunt current amplifier

I'm trying to build a 20A E load and decided to use a 0.01Ohm shunt for the current measurements and set so I needed to amplify the shunt voltage by 10 using the "rail to rail" AD4522-2. At ...
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  • 155
16 votes
6 answers
2k views

How do professional designs compensate for offset voltage in opamps?

I am new to electronics and have been told in class to always add precision potentiometers to compensate for input offset voltages in opamps for signal conditioning. My concern is that this offset ...
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0 votes
1 answer
46 views

DC offset in closed-loop ideal op-amp

It's from Sedra. It's about how the offset current messes with the input of an inverter. It's "easily seen", but no so for me. Can anyone explain to my "not easily seen" brain how ...
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0 votes
0 answers
77 views

Effect of op-amp's input offset voltage on stability of constant current load

I'm designing a simple circuit to have a constant current load with good short term stability. The exact current value is not important, as long as it's stable short-term (10 seconds). R1 is the load -...
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1 answer
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OA min/max input offset voltage

I want to build an instrumentation amplifier using MC33079 quad op amp, in page 3 of the datasheet it specified min and max input offset voltage: What causes the input offset voltage to increase?
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1 vote
0 answers
42 views

How can I add an offset voltage at the input of an instrumentation amp?

I want to measure the voltage of an H-Bridge Sensor. However, due to the manufacturing process, the bridge has an offset several times larger than the useful signal (it can easily measured by ...
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-1 votes
2 answers
44 views

Offset Voltage at Op Amp Inverting Terminal

I'm using ADA4350 as a transimpedance amplifier with various gains for feedback paths (30 ohms,3k,300k and 3 mega ohms respectively). When I give a constant current source of about 23mA as input to it,...
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0 votes
2 answers
110 views

Input offset voltage, input bias current, input offset current of operational amplifier

Are operational amplifier parameters such as input offset voltage, input bias current, input offset current DC noise? Can I get rid of these noises by using a high-pass filter? If not, how can I get ...
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  • 101
1 vote
1 answer
302 views

Opamp input offset voltage when saturation

I wonder, how to affect the input offset voltage of inverting amplifier when it's output in saturation? I'm changing gain with decreasing the value of R2. When the gain is greater than 5, output in ...
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1 vote
1 answer
375 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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3 answers
219 views

What is an external nulling "resistor"? [duplicate]

in the following datasheet: https://www.analog.com/media/en/technical-documentation/data-sheets/OP07.pdf Which is a OP07 a high precision ultralow voltage offset OpAmp, it says in the datasheet. ...
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1 vote
3 answers
270 views

I set up an amplifier (LF351) for a gain of 5.7, but it is saturating. Do I have to utilize the offset null pins?

simulate this circuit – Schematic created using CircuitLab The feedback network I am using is a voltage divider with 4.7K and a 1K resistor. The node after the 4.7K resistor is connected to the ...
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  • 111
0 votes
3 answers
203 views

Opamp input offset voltage...common mode?

Looking at the datasheet for an OPA197 opamp, I see this: What is the circled expression trying to tell me? The common mode voltage is equal to the voltage at the non-inverting input minus 1.5 V ...
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  • 7,232
1 vote
3 answers
352 views

Offset voltage comes to saturation in coupling amplifier circuit using OpAmp with Gain=100

I did get in troubles with my student project circuit below! The purpose is to amplify difference between two inputs. Specifically, 20mV and 10mV are connected with input to get 1V at the last OpAmp'...
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0 votes
1 answer
205 views

Single supply inverting OP amp. Problem: half signal at output

I have built a simple inverting amplifier circuit with LM4565 operational amplifier. But only half of the signal appears at the output of the circuit and the gain looks wrong as well. Could anyone ...
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  • 391
1 vote
1 answer
469 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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2 votes
0 answers
796 views

Comparing sine wave and triangular for spwm using comparator

i am trying to generate sinusoidal PWM by comparing sine and triangular wave. First i just tried to compare sine wave with reference voltage in order to check the working of op-amp. I get a problem ...
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  • 339
1 vote
2 answers
772 views

Input Bias Compensation Resistor Calculation for an Integrator

I have been reading the following tech note from Analog Devices that discusses designing an op amp circuit to compensate for the input bias current: https://www.analog.com/media/en/training-seminars/...
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0 answers
58 views

How to solve practical OPAMP with finite differential resistance and finite offset current while other parameters can be considered ideal?

simulate this circuit – Schematic created using CircuitLab Ip(bias)=200nA rd=differential resistance=5Mohm a=infinite What should be its output? I am confused if I should consider negative ...
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0 votes
1 answer
224 views

What is role of R9 resistor at input to OPAMP in this circuit?

I guess it has to something with offset nulling but not getting how .Circuit shown is of instrumentation amplifier.
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1 vote
1 answer
517 views

Op Amp Input Offset Voltage vs Common Mode Voltage

I would like to use an op amp AD8618 for a design, and need the input offset voltage to be low. For this op amp it seems fine with maximum of 65uV, but looking at the charts on page 6 etc, it seems to ...
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  • 71
1 vote
1 answer
31 views

sensor output level shifter

I am trying to read a map sensor with an ads1232 ADC. The Map sensor requires 0v(ground) and 5v+ and outputs 2.5v fluctuating +-2.5v depending on the pressure. The ads1232 can read +-2.5v but without ...
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1 vote
2 answers
244 views

opamp Vos bias resistor

In a simple inverting amplifier I've seen the below topology in my text book, where R3 is said to be R3=R1||R2. However, every time I see this, all three resistors are the same values! From Forest ...
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  • 5,745
1 vote
2 answers
118 views

op-amp pin is sitting at high voltage (active low-pass filter)

I am looking at using the OP1177 to act as an active low pass filter. I need to smooth out a 20kHz signal burst with a minimum of 50 cycles to reach a voltage on the output to interrupt an ...
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  • 341
0 votes
1 answer
349 views

Input offset voltage for microphone circuit

Does anyone know what's the input offset voltage (oscillated 2.5V) to the op-amp in the circuit for? From my understanding, the input offset voltage needs to be extremely small so that output DC ...
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  • 1
0 votes
2 answers
588 views

Supply Voltages for Inverting Amplifier

I want to use an inverting amplifier to linearly shift and convert a signal with voltage range -10...+10V into 0 ... 3.3V for an ADC of a microcontroller. I wanted to use the circuit presented in this ...
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  • 17
0 votes
2 answers
2k views

OP-AMP DC offset compensation

I do not know how to compensate the DC-offset caused by the Input bias current. simulate this circuit – Schematic created using CircuitLab How to compensate the input current bias DC offset? ...
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  • 2,279
2 votes
1 answer
1k views

Compensating for offset voltage in bridge measurement before instrumentation amplifier

I'm using an instrumentation amplifier (INA118) to measure the signal from a full bridge strain gauge (tension only, all 4 resistive elements are strain gauges, slow changing (DC) signal). I'm using a ...
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0 votes
1 answer
598 views

input offset voltage of an op amp

How input offset voltage (2mV max) will effect input which is at 0.5mV and 0.5 to 5Hz frequency? The input voltage and frequency are of heart vibrations which will be very low.
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  • 17
2 votes
5 answers
631 views

Do AC coupled inputs suppress voltage offsets in an op amp?

Background: I'm trying to build an AC coupled pre-amplifier that doesn't succumb to voltage offsets and input bias currents. The input signal has noise ~10 nV level, and I want a factor of a million ...
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5 votes
2 answers
490 views

Strange voltage tracking problem with regulated power supply build

I'm building my own regulated linear DC power supply based on the Farnell L30 (service manual and circuit diagram here) and I'm sticking mainly to the original design with some modifications for parts ...
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  • 1,530
2 votes
3 answers
4k views

Measuring input-offset-voltage of an opamp in sim and getting very different result in datasheet

With the definition of "input offset voltage" I wanted to find it in simulation for LM358 op amp. Here is the definition: "Input offset voltage is the differential input voltage that would have to be ...
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  • 3,340
0 votes
1 answer
317 views

Combined temperature coefficient of LM741 and trimmer pot for null offset

I want to use a 10k trimmer pot with a 250ppm/°C tempco for offsetting input offset voltage of an LM741 op-amp. Cermet potentiometer temperature coefficients partially answers my question. And the ...
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