Questions tagged [offset]
The offset tag has no usage guidance.
90
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1answer
89 views
Help with calculating frequency offset
A 10 MHz TXCO is driving a receiver’s front end and has a frequency deviation of 10 ppm. It drives a direct downconversion RF front-end mixing the L5 frequency. What is the frequency offset at ...
1
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1answer
36 views
Transform one voltage range to another
I have a 0-12V voltage range (Vin) that I need to transform to a 100mV-900mV voltage range (Vout). The 0-12V input is fixed from another system, and my analog circuitry needs the 100mV-900mV for ...
0
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1answer
39 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, ...
0
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1answer
28 views
How calculate the error offset or the noise threshold for MyoWare and FSR sensors?
I am working on EMG and FMG signals to extract time domine features and i need a threshold value for some features. I must calculate it from the characteristics of MyoWare and FSR sensors.For the ...
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3answers
66 views
Why does the bias decreases in this clamper circuit?
I'm trying to do a positive clamper circuit in easyeda.com to bias a triangular signal of 200mV pk-to-pk at 1kHz centered around 0V. Here's the circuit:
The bias seems to work only during the first ...
-2
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1answer
110 views
how to give dc offset to the square wave from 2.5 v to -2.5 to 5 to 0 volt?
a)I want to change my square wave signal from -2.5 to 2.5 volt to 5 volts to 0 volts? actually this will be given to MOSFET driver ir2110.
b) In the first picture, it is my original square wave coming ...
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0answers
35 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 ...
1
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2answers
67 views
Large signal with DC offset matching to ADC with input centered around 0V
I'm new to this forum, so plear bear with me.
I have a 0 to 23v signal coming from a transimpedance amplifier that I need to squeeze into -2.5v to 2.5v input for an ADC. The signal is first put into ...
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2answers
45 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 ...
1
vote
2answers
95 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-...
0
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1answer
73 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 ...
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1answer
31 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 ...
-1
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2answers
40 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,...
0
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4answers
249 views
Offset when trying to convert square to triangular wave
Hi I constructed a circuit to create a 1Hz square wave with LM741 Opamp. The first part makes that and it makes it perfectly.
But I need to convert it to a 8Vpp triangular wave. Without any offset, I ...
0
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2answers
120 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 ...
0
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1answer
61 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 ...
1
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1answer
438 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 ...
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0answers
87 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 ...
1
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1answer
162 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 ...
0
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2answers
271 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 = ...
0
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1answer
1k 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 ...
4
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2answers
1k 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
161 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
80 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 ...
0
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1answer
34 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
0
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1answer
153 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-...
0
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1answer
87 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 ...
-1
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1answer
183 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 ...
1
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1answer
63 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 ...
2
votes
3answers
2k 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 ...
2
votes
1answer
1k 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
113 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 ...
0
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1answer
342 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
votes
1answer
442 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 ...
1
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1answer
3k 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 ...
0
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2answers
698 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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votes
3answers
167 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 ...
1
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1answer
68 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 ...
1
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1answer
965 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
votes
1answer
282 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 ...
0
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2answers
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 ...
0
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2answers
7k 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 ...
0
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2answers
603 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 ...
0
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3answers
196 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, ...
0
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1answer
151 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-...
0
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3answers
904 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 ...
1
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1answer
2k 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 ...
0
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1answer
88 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: ...
0
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1answer
554 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
1k 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 ...
