Questions tagged [dc-offset]
The dc-offset tag has no usage guidance.
77
questions
0
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3answers
81 views
Circuit to adjust -30V to +30V input to 0 to 3.3V for ADC? [duplicate]
Currently working on an oscilloscope design that would require each channel to be able to take in between 30VPP, -30V to +30V, which will go to an ADC which has a maximum input of 3.3V.
What types of ...
0
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1answer
43 views
How to remove DC offset (and make average DC value 0V) from ADS1261 square wave AC-excitation circuit
I am attempting to remove the DC offset from the 1 kHz, ± 2.5 V, AC square wave output pins of an ADS1261 (http://www.ti.com/lit/ds/symlink/ads1261.pdf). However, when measured on the oscilloscope (...
1
vote
1answer
53 views
AD620 reference terminal problem
I'm trying to add a DC offset level to a sine signal through an instrumentation amplifier (as the figure below shows.)
The problem is that, in the simulation, everything works perfectly, however, in ...
14
votes
2answers
1k views
Does driving a speaker with a DC offset AC signal matter?
Do these two input signals have different effects on a speaker?
An AC signal with some value of DC offset.
Same AC signal but centered at 0 V.
0
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1answer
60 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
vote
1answer
91 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 +...
0
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2answers
135 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
votes
3answers
175 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 ...
0
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1answer
103 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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0answers
53 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
votes
1answer
162 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
164 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 ...
0
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1answer
271 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. ...
1
vote
3answers
164 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
votes
1answer
1k 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
195 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 ...
0
votes
1answer
65 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 ...
1
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0answers
396 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
votes
1answer
101 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 ...
1
vote
1answer
102 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 ...
-3
votes
1answer
2k 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 ...
0
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4answers
5k 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 ...
0
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3answers
1k 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 ...
3
votes
3answers
358 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
votes
2answers
797 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? ...
3
votes
2answers
1k 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 ...
5
votes
3answers
3k 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
votes
1answer
713 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
votes
3answers
17k 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 ...
1
vote
1answer
420 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 ...
1
vote
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
vote
1answer
79 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
138 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
2k 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
131 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, ...
2
votes
2answers
342 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
votes
2answers
355 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 ...
0
votes
0answers
2k 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
votes
1answer
85 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
votes
1answer
925 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 – ...
0
votes
1answer
252 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
608 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 ...
0
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2answers
570 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?
0
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1answer
592 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
votes
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 ...
1
vote
2answers
783 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 ...
0
votes
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 ...
1
vote
3answers
9k 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
750 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
votes
1answer
370 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 ...
