# Questions tagged [dc-offset]

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### How do I calculate a voltage divider with an offset

I've got the following circuit: simulate this circuit – Schematic created using CircuitLab By running the simulation I can see that a signal voltage of 3.13 converts to an output of 2.14, but I'...
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### DC offset and amplifier

I have a very small AC signal from a receiver coil of Metal Detector that I want to provide some DC offset so it can be handled by a microcontroller after it is amplified. I came up with this solution....
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### Removing DC offset in MATLAB

My teacher has a demodulated signal and he removed the DC offset with this one line of code in MATLAB: y_dc = y - mean(y) Can someone please explain how this line ...
1 vote
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### Measure dynamic comparator's offset voltage

I'm trying to characterize a comparator I built and I am wondering how I can plot offset voltage over time. I would like to eventually add a calibration block that will reduce the comparator offset ...
73 views

### Confusion regarding term "offset"?

I am confused regarding term "offset". What is its meaning in context of function generator and oscilloscope? I have tried to google, but I get results in context of op amp and some results ...
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### Why is it important to eliminate ground-shift at the ground of a microcontroller?

I've asked a question about differential amplifiers and their uses in measuring current through a shunt. In doing so, lots of people advised me not to sense current on the low-side since that can ...
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### How does this DC offset sinwave input work?

I have learned that this circuit will move the sin wave up to a DC points due to the voltage divider, that is: V_out = V_in + Vcc*R2/(R1+R2) I was using LTSpice to simulate this and it works, I try to ...
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### Is using a passive RC high pass filter at the output of an opamp a good method to remove DC offset?

All the information I am able to find related to this discuss about AC coupling the inputs of an amplifier but never the output. I wish to know if there are any issues with AC coupling at the output. ...
49 views

### How to block DC offset voltage on a potentiostat output?

I have an AUTOLAB potentiostat: working electrode (WE, Pt wire), counter electrode (CE, Pt wire), reference electrode (RE, Ag/AgCl solid state). I would like to capacitively couple the potentiostat ...
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843 views

### How to implement gain and offset in a single opamp?

I tried designer here in this page. But my particular case (Case 2) seems not working in the page. Then I Read this document and my case there, is section 4. But my calculation results are not ...
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### Remove DC comp offset of AC current

I am attempting to build a circuit that excites a sensor which requires an AC current of ±1mA and 20kHz frequency. For this, I used voltage to current converter integrated circuit XTR110, which is ...
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1 vote
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### Unkown DC offset of an isolation amplifier circuit design

I am designing an isolation amplifier that consists of the following blocks: A comparator which produces a PWM signal A coupling capacitor that achieves galvanic isolation A voltage follower that ...
1 vote
105 views

### Low-frequency high.pass filter drifts with temperature

for a phase sensitive measurement, I would like to have the DC offset of a signal cancelled. The AC-signal will be amplified and then the phase of it is measured in reference to another AC-signal. My ...
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568 views

### Accurately amplifying a number of current sense transformers

I've got 16 current sense transformers that are being used to monitor AC loads. The SCTs are current output type, producing 50mA on a 100A load. The maximum burden resistance is 10Ω, thus the voltage ...
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115 views

### What kind of op-amp circuit is this?

I am trying to understand the circuit have shown below. As far as I tried, it seems a differential amplifier for me. So, I tried to solve it in the way we deal with DC signals. But I failed to solve ...
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### Wheatstone bridge to create offset

While comparing schematics of two old analog oscilloscopes (Tektronix 475 and Goldstar 9020,) I was expecting many differences to get better frequency response since the first is a 250MHz and the ...
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### Sawtooth VCO DC offset issues

[Apologies in advance for possible misuse of terminology. I don't have any formal education in EE and am mostly self taught, so I may be lacking in some fundamentals.] I am trying to design a discrete ...
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### What is the practical difference in this DC offset remover?

I am working on audio signal oscillators. My oscillator generates 0V to +5V triangle wave. Then I'm removing DC bias to get -5V to +5V signal. I have found two examples on how to do this: What is the ...
1 vote
67 views

### high voltage DC biasing on top of low voltage AC with floating load

I am in process of designing a power supply for heating a filament in an electron gun. The AC heating current has to float on top of DC high voltage acceleration voltage. The following circuit seems ...
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463 views

### Meanwell Led driver: internal 3-in-1 dimming circuit

In Meanwell led drivers like the ones from the XLM, HLG or LCM families, how does the internal circuitry for the 3-in-1 dimming feature (0-10V, 10V PWM, 0-100kOhm) look like? I use a LCM-25 in my ...
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### ua741 DC offset on the output

I have ua741cn and connected it to 10V. V_+ =10V V_- =GND Just to verify I have a valid chip I did a little test. I connected the non-inverting input to GND and the inverting to 10V I would expect the ...
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### DC offset before signal being fed into an instrumentation amplifier from a bio potential source

I am trying to design an instrumentation amplifier, having 2 bio-potential sources as its differential inputs, each having peaks in the order of 10's of uV and a frequency band of 3-50 Hz. One of the ...
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### Is there a reason the offset of this opamp is done like this?

I recently found this schematic from a project at university (drawn by our lecturer). It's a low pass filter that also adjusts the gain, and adds an offset of 1.5 V (the input signal can be positive ...
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### What is causing the DC Offset in Mirrored Howland Current Pump Circuit

I am creating a current source to try to expand my knowledge about electronics design. After some research I decided to build the Howland setup since I want to develop a bipolar current source. The ...
281 views

### OpAmp Spice Model: Offset vs Common Mode Voltage

The spice Model of the OPA350 specifies that the DC Offset Voltage vs Input Common Mode voltage is implemented in the model. If I do the simulation however, all I can see is a linear trace, when x ...
188 views

### bias a signal with DC input coupling, but without attenuation?

I want to bias the analog signal present on an MCU output pin. This signal varies between 0v and ≃3V, I need to shift it down to -/+1.5V range. Most importantly, I need to keep any DC offset ...
1 vote
312 views

### Why do we need differential amplifier after Transimpedance amplifier?

I am implementing the circuit published in AN3025 Transimpedance Amplifier Design as shown below. When I am simulating this circuit, a few questions come to mind: Q1. Why do we need a differential ...
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1 vote
811 views

### Offset and scale a DAC output with opamps

I am trying to make a simple oscillator controller with an arduino and a DAC, to learn electronics. I need to send a voltage between 12V and 17V to my oscillator to control its frequency. I got a 24V ...
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### DC offset for AC signal

Hi guys, I am looking for some clarification regarding how to create a DC offset for an AC signal. Attached to this post is a quick schematic that I have drawn. Am I correct in saying that by ...
814 views

### Adding DC offset to PWM through a unity gain buffer

I have a PWM signal with a period of 200uS and a duty cycle of 20%. For prototyping reasons (this is simulating a pulse that I'll be receiving from circuitry later on in the project), I want to read ...
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120 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 ...
287 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 ...
2k 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 (...
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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 ...
3k 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.
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### 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 ...
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470 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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### 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 ...
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### 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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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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### 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 ...
340 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 ...
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### 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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### 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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### 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 ...
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### 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 ...
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### Resistor values for OpAmp circuit with dc offset applied to inverting pin

$$\newcommand{\rth}{R_{TH}} \newcommand{\vth}{V_{TH}} \newcommand{\rf}{R_{F}}$$ Asked this in the math stack exchange, who recommended asking here instead. I'm stumped (hence posting here!) with ...
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### 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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852 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 ...
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