Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [dc-offset]

127 questions
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How do I correct the offset voltage of op-amps which have no explicit offset-null pins?

Not all op-amps have explicit offset-null support, but all op-amps have an offset voltage. This is exactly my practical circuit: How do I correct the offset voltage of TL084 in this circuit? (Datasheet: TL084)
hkBattousai
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Changing a Signal's DC Offset

I have a square wave being generated from a waveform generator oscillating between 0 V and 5 V. The generator does not support negative DC offsets. I need to shift this signal down to be centered about the 0 V value, i.e. oscillating between -2.5…
Präriewolf
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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.
muyustan
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3 answers

What is the effect of supply voltage asymmetry in opamp amplifier topologies?

What is the effect of a \$\Delta V\$ voltage shift in one of the supply voltage inputs of an opamp on its functional behavior (\$\Delta V\$ can be positive or negative)? Suppose that, I'm designing a non-inverting amplifier with \$R_1 = 100k\Omega\$…
hkBattousai
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2 answers

Unwanted DC offset at the input of inverting op-amp

I'm designing an envelope generator for a sort of mini synthesizer I'm currently working on. I want the envelope signal to evolve (rise or decay, depending on the SPDT switch) only when the switch (SW1) is closed. The first part of the circuit (RV1,…
Javier Soto
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Matched resistances at inverting and non-inverting diff amp inputs in power amps: why?

The following is a common input and feedback structure in audio power amps: simulate this circuit – Schematic created using CircuitLab What I often see is that the resistors are chosen such that \$R1 + R2 = R3\$. Why? Of course, I understand what…
Kaz
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DC offset correction loop. What's its advantage, compared to a high-pass RC filter?

Once in a while in literature I see DC offset correction loop. What are the advantages of such DC offset removal loop, compared to an RC high-pass filter? The RC filter would look like this. I work on one-off research devices for which the cost of…
misk94555
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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 of the wave. Then why oscilloscopes display…
Yasindu
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Combined ADC scaling and offset with variable input voltage ranges

I am trying to create a circuit which will allow me to scale and offset a voltage (be it AC or DC) to within the range of the Arduino ADC. The voltage could be anything between + and - 250V, but I also need to have good sensitivity over lower…
Majenko
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Convert an audio signal to 0-5V using single supply op amp

I'm trying to capture an audio signal using an analog input of an Arduino Uno. The Arduino's analog input must be between 0-5V. I'd like to use a single power supply via an 9V battery, so I'm using a voltage divider to offset the input signal and…
Fiver
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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 k_gain_comp and the offset by an additive value…
Maxwell1919
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6 answers

How to offset a 15 VDC signal to be visible on the scale of 50 mV?

I'd like to watch the output from a power supply to evaluate noise and distortion. The output is 15 VDC. Unfortunately, when I zoom in to 50 mV per division, the signal is off the scale. I'm using vertical offset control to provide valuable…
Jerzy Przezdziecki
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How does this LLC converter keep 50% duty cycle and zero DC offset with AC-coupled feedback?

I'm currently designing an LLC resonant DC/DC converter with 12V input, +/-15V output and nominal 200W combined output power. I've already got my resonant circuit, transformer, gain curves and power stages working and optimized. Right now I'm…
Jonathan S.
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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 signal generated from the voltage drop over that…
Polynomial
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4
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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 experience any major DC offset issues if I connect an…
Caleb Reister
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