# 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 ...
• 3,340
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 ...
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
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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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 ...
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 ...
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 ...
• 155
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 ...
• 155
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 ...
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 ...
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 -...
• 817
39 views

### 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?
• 1,974
1 vote
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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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,...
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 ...
• 101
1 vote
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 ...
• 415
1 vote
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 ...
• 596
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
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 ...
• 111
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 ...
• 7,232
1 vote
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'...
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 ...
• 391
1 vote
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 +...
• 179
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 ...
• 339
1 vote
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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### 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 ...
• 73
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
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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1 vote
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
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 ...
• 5,745
1 vote
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 ...
• 341
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 ...
• 1
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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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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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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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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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 ...
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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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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