Questions tagged [dc-offset]
The dc-offset tag has no usage guidance.
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1answer
33 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
61 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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2answers
71 views
Does this Sallen and Key filter work on a single supply and does the input offset matter?
This is the schematic for a Sallen and Key from the Doepfer Musikelektronik website:
simulate this circuit – Schematic created using CircuitLab
I intend to run this in a synth, the oscillators ...
0
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3answers
85 views
AD620 pH probe has a positive voltage offset!
I am a chem eng. but little background in electronics.
I'd like to interface a pH probe with an AD620A, the original PCB that came with pH probe was damaged by a current leak in the solution.
I made ...
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1answer
41 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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0answers
40 views
Remove Sensor Voltage Offset ADC [duplicate]
I've got a pressure sensor and a flow sensor. Both have a 5V span, but have a (different) null offset i.e. at zero pressure (gauge) or zero flow they read ~2V and ~1V respectively.
I am using an ...
4
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1answer
99 views
Analog switch on an instrumentation amplifier input
I'm working on a project for school that involves a configurable input stage (AC/DC coupling and variable input impedance) connected to an instrumentation amplifier. I am wondering whether I will ...
0
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1answer
86 views
Single supply opamp colpitts oscillator
I'm designing a Colpitts oscillator with a single supply rail-to-rail opamp powered with 3.3 V. The positive input of the opamp is set to VDD/2 to offset the negative part of the oscillations so ...
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1answer
108 views
How do I remove the offset from the DAC output and change the range?
This DAC has an output range of 1-3 volts. Here's the datasheet:
Datasheet
I'm getting pulses with different amplitudes, frequencies, duty cycles and widths varying from 0.2 ms to 2 s from the DAC. ...
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3answers
60 views
Inherent DC Bias in ADC sampling
I was just simulating the quantization behavior of ADCs of different bits, on data sampled by a 24-bit ADC. What I noticed that as we go towards ADCs with less bits a DC bias in the signal becomes ...
0
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1answer
350 views
Op Amp as a simple switch
I want to build a little voltage switch that switches on a buzzer and a relay when a certain voltage is reached. Please have a look at the schematic.
I use a trim potentiometer to set up the switch ...
0
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1answer
133 views
Resistor values for OpAmp circuit with dc offset applied to inverting pin
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\newcommand{\rth}{R_{TH}}
\newcommand{\vth}{V_{TH}}
\newcommand{\rf}{R_{F}}
$$
Asked this in the math stack exchange, who recommended asking here instead.
I'm stumped (hence posting here!) with ...
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1answer
58 views
What is a good way to add a programable offset to a diffential signal?
I have an AC coupled, ~10 MHz to 1 GHz, differential signal, with a programmable gain, coming from a detector. The signal contain pulses, and the DC-balance is poor but constant (even if my hand ...
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0answers
247 views
Audio DC Offset
I want to make an audio processing device using a Teensy and I want to run an analog signal into it. My background is in audio programming, so electronic circuits are new to me. I realise audio is an ...
2
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1answer
96 views
Opamp DC offset Question
Just need some help understanding what's happening in removing the DC offset from two band-pass filters.
VG has a value of 4.5V. When I added in the virtual ground the circuit had an offset of 4.5V ...
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1answer
80 views
Unwanted constant offset in ADC reading
I am using an AD7323 12bit+sign 4-channel ADC an on a custom Arduino shield.
I drive it with 12V from a power supply and -12V created using an ICL7662 IC. VCC is 5V from the Arduino.
The ADC is used ...
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1answer
1k views
How to add dc offset and gain to a given signal
Before I start, I just want to mention that I am a premed student. However, I want to build a DIY amp for my headphones since my computer can't properly drive them so I decided to take an electronics ...
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4answers
2k views
Adding DC offset to a given input
let me start off by saying I am a computer science student so I'm not familiar with electronics whatsoever. Anyway, I am faced with this problem:
I am given some input (say, a sine wave) centered on ...
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3answers
757 views
Ideal integrator op-amp DC offset at output?
i have a question with this ideal op-amp integrator circuit
where R=1k and C=1uF. Then i put a 50mV 100Hz square wave at the input and get the following response, which is what i expected and ...
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3answers
244 views
Offsetting a differential amplifier to remove the need for a dual supply
I'm developing two similar circuits that will enable me to differentiate the X and Y coordinates from a segmented photo-diode (Four segments). These coordinates will be dependent upon the position of ...
0
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2answers
535 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? ...
4
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2answers
734 views
How does an inverting op amp add a DC offset?
I'm working on a project based on this publication. I've built the circuit but something is not working.
I've tried checking the voltage with a multimeter (I do not have an oscilloscope at hand) and ...
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3answers
2k views
How to compensate gain and offset errors
I have an analog circuit which has an offset error as well as an gain error.
I can measure the analog output of the circuit and I am able to manipulate the gain of the circuit by means of a factor <...
0
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1answer
468 views
DC offset of amplifiers for 12V single supply operation
I want to be able to amplify a signal using op-amps and a single power supply. In order for the op-amps to have maximum swing with a 12V power supply the AC input signal needs to be offsetted to 6V.
...
3
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3answers
12k views
Peak to Peak vs. Amplitude
For a sine wave,
Amplitude is the fluctuation or displacement of the wave from its
mean value.
Peak-to-peak (pk-pk) is the difference between the maximum positive
and the maximum negative amplitudes ...
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1answer
310 views
Questions about DC offset
As many people on the internet I'm trying to add a DC offset to an audio signal. I've amplified it with an LM324 op-amp, using dual supply (+/- 5V).
Afterwards I'd like to input this audio in my ...
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3answers
1k views
A question on sizing a blocking capacitor
When I was trying to find an answer for an optimum capacitor value for entire DC removal of a signal I encountered the following:
In general, DC blocking capacitor shall behave like a short at ...
1
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1answer
65 views
I am stuck at a question (about bias current and offset voltage)
So I was doing the following question from sedra smith microelectronics:
I have managed to do all parts in the question except part d. I am stuck at part d.
The way I have tried is the following: ...
0
votes
1answer
115 views
Miller integrator dc offset ->why no gradual increase towards saturation?
I made a miller integrator with a dc offset. (The initial condition of the capacitor is set to zero so initial condition is not the problem). There is a capacitor or 10-7 F capacitance and a source ...
0
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1answer
1k views
dc offset in a miller integrator
I simulated a miller integrator circuit on multisim online. When I did so I made sure that dc offset in the op amp and the source is zero and also bias and offset currents are zero. But in output to a ...
0
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0answers
102 views
Peak value of sine wave for capacitively coupled inverting amplifier
I was working on question 2.23(a) and there is asked what input voltage is needed in order to ensure that the output does not clip. The clipping limits are +10 to -10 V.
I solved that, and, ...
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2answers
266 views
Do dual-supply switch ICs provide DC Offset internally?
I am using analog switch ICs for the muting of audio sources, and am looking for some clarity on what I think I understand about them.
Below is a simplified comparative schematic of how I believe ...
2
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2answers
310 views
Why do i have a high DC component at the output of this circuit?
I want to create an sine wave from a uC PWM with a very low DC offset. I did some research and decided to simply make a Band-Pass filter, composed by one pole passive High Pass Filter, to filter the ...
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0answers
1k views
Calculate the gain of the instrumentation amplifier for an input current I
I'm a little confusing to calculate the gain of my instrumentation amplifier due to different variables and conditions that may influence the gain.
I am creating a project, which needs to inject a ...
0
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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
692 views
Wrong result in spice simulation of DC Offset at AC coupled diode
I'm playing around with a diode as AM demodulator and have stumbled upon a phenomenon that seems logical but I can't reproduce it in LTSpice. My setup is the following:
simulate this circuit – ...
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1answer
208 views
Offset in a comparator's input
This is probably a basic question which i'm stuck with:
Why should there be offset at the input signals?
=> We have offset voltage of 1V on both the signals, when i remove the offset i get very ...
0
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0answers
529 views
Vrms, Vpk-pk, Vpk, Vavg for AC signal with DC offset
This might be a dumb question, but what values change when applying a DC offset to an AC signal?
Does Vpk represent the maximum voltage of the signal, in which case it increases directly with the ...
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2answers
479 views
Comparator input offset voltage
This is an example about input offset of a comparator in Analog Integrated Circuit Design by Tony Chan Carusone (page 414).
Could anyone explain why the plot in Fig 10.1 is a normal distribution?
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1answer
521 views
How to get raw emg signal without offset
i try to build emg sensor + arduino from diy found on internet.
every things work fine, but i want only raw signal for some bigger project not rectify. i do circuit as below
and signal looks like
...
0
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1answer
1k views
Adding offset before second order active filter
Since i wont be able to provide negative voltage to the negative power rail of the OPAMP, i wanted to give my signal a slight positive DC offset and execute the amplification process in the positive ...
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2answers
705 views
Very low frequency Passive High Pass filter. Capacitor type
I want to design a passive high pass filter to remove a voltage offset with a cut-off frequency of 0.1Hz. A simple RC filter would include the values of R = 159k and C = 10uF. I want to avoid using a ...
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1answer
1k views
Input offset voltage transimpedance amplifier
I am currently creating a transimpedance amplifier for a small-area photodiode that creates around 0.15mA, 0.00015A, from it's associated laser diode at it's nominal operating point.
I am currently ...
0
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3answers
8k views
How to remove DC offset of the input signal without using an opAmp?
Below is a pulse train with a DC offset:
This will go to the circuit below as input.
The thing is this works well in simulation but in real I need to remove the offset of the input signal.
My ...
1
vote
1answer
635 views
Solution for adding around 60V dc-offset on digital signal(0 and 5v) of 10MHz frequency
I thought of using Opamp adder for this but the problem is high offset value which can saturate the Opamp. Can you please suggest some other solution ?
0
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1answer
326 views
Source of DC offset in circuit
I am trying to inject a 1 mA current pulse (10% duty cycle) at a frequency of 10 Hz, across a ball of gel(20 cm in diameter) through rubber electrode pads, using a constant current source (built in ...
0
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1answer
40 views
Signal offset using FRDM-KL25Z
I am developing a voltmeter using FRDM-KL25Z and I needed a voltage divider with a 1.65V offset, and here is the circuit I am using:
Does the offset work well? Is there any other (easy) way to do it?
...
2
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1answer
659 views
How to null offset on op amp without affecting gain?
I realize that there are a lot of questions relating to op amp offset here on electronics.se; however, none of them seemed to answer my exact question. If some of them are too similar, feel free to ...
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2answers
1k views
Voltage divider with offset
I am trying to build a voltage divider with an offset. I have an input signal of 10 Vpk and I want it to have a DC offset of +1.65 V. The problem is that I don't have a DC source of 1.65 V, but I do ...
0
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1answer
334 views
Bias current and offset voltage, op-amp 741 DC imperfections [closed]
Can the effect of the bias current counterbalance the effect of offset voltage?
I am asking this question because today in a lab it occurred to a couple of groups.
Is there a reason for that?
