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Questions tagged [input-offset-voltage]

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52 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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1answer
55 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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3answers
44 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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3answers
101 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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3answers
98 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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3answers
195 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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1answer
46 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 ...
1
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1answer
79 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
171 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 ...
0
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2answers
61 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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0answers
55 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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1answer
90 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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1answer
103 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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1answer
25 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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2answers
86 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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2answers
59 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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1answer
108 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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2answers
329 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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2answers
650 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? ...
2
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1answer
294 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 ...
0
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1answer
463 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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4answers
328 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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2answers
301 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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3answers
2k 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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1answer
177 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 ...