Questions tagged [offset]
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137 questions
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VFD offset tutorial
I am trying to understand VFD's (Variable Frequency Drives) concept of 'offset' What is this feature? When do I use it. What does it achieve.
I have searched Youtube: lots about VFD but can't find ...
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Voltage amplifier for a triangular wave using 2N222 BJT
My task is to amplify the voltage of a triangular wave which is between 100mv and -100 mv, so I design a common emitter circuit to do it, but when I check the vout I see that my output wave is already ...
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HCPL2531 offset voltage status at opto output
I am testing in a panel with very high motor noise. I want to pass the encoder data through the opto. When I apply the following scheme, my inputs and outputs are as I want.
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Then I ...
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Circuit that offsets input voltage to exactly 0 V
I am looking for a (op amp) circuit to offset \$f(x)= \log(x)\$ always to zero. More comprehensible is the explanation on the x-y plot below.
Basically, it is possible to offset the voltage with an ...
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How to offset a sinusoidal voltage centered at 0 V for power grid measurements
I am trying to take voltage and current measurements from the power grid (120V 60Hz) and process them with a 3.3V based digital signal processing board (TI F280049C launchpad)
I am using LV25-P and ...
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Negative offset voltage on analog input in data acquisition device (DAQ) connected to a photodiode in the dark
I have a data acquisition device (DAQ): USB-6002 from National Instruments (NI). I am recording an analog voltage from a (cathode-grounded) photodiode through a variable resistance (50-100k Ohms).
I ...
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Scale and offset voltage range from DAC to VCA
Still tinkering with my VCA based effect mixer. I control multiple DACs (MCP4922) which send control voltages to the VCAs (AS2164). Until now I've just fed the DACs a reference voltage of 3.3V to ...
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Why will the offset of a source-follower which is connected to the output of an opamp as a voltage buffer limit the op-amp output swing?
I am currently reading chapter 12, "The Common-mode Feedback Circuit" in Analysis and Design of Analog Integrated Circuits by Gray and Hurst.
Page 815, gives the following statement for ...
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438
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Control (0 - 10 V) fan from LM358
I want to generate output of (0 - 10 V) from ESP32 GPIO (0 - 3.3 V). Basically fan is connected to the output. I am attaching a circuit of it. Do I need any changes in the design or it will work? Will ...
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How to add an offset to a PWM signal to control a N-channel MOSFET that has a large source voltage?
I want to control a N-channel MOSFET through a PWM signal generated by an Arduino board. The amplitude of such PWM is 0V-5V with respect to GND with frequency 20kHz.
My idea is to send the PWM signal ...
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Can't exactly adjust the offset in an op-amp circuit
I'm trying to make a neat and obvious circuit for amplifying a 0-3.3V PWM signal to -10/+10V. I'm able to adjust the gain and feed the signal on the inverting end. I also want to add a 1.65V (3.3V/2) ...
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Opamp circuit (amplifier with offset) degrades analog signal
I'm trying to amplify and offset a voltage from an DAC (0V to 3.3V) to -5V to +5V.
For this, I'm using a opamp (LM358) with dual power supply (-15V , +15V) with an offset and amplifier configuration.
...
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Could I have a variable gain differencial amplifier at the same time I have variable offset adjustment?
I had a doubt about designing a varible offset adjustment for a differencial amplifier (op-amp). (This question: Offset adjustment with unity-gain buffer). The solution was saved in the accepted ...
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Offset adjustment with unity-gain buffer
I want to include to my design an 'variable offset adjustment' circuit using an operational amplifier. This circuit would allow me to ajust the offset of my design. In my circuit, I already has a ...
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Amplification of the oscillation of a signal without amplifying the offset
Knowing that I only have op-amps, comparators, resistors, capacitors, and simple diodes at my disposal, is there a simple way to amplify the small oscillation of such a signal without amplifying the ...
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Voltage multiplier operating principle with pulsating DC
I need to generate up to 2 kV by pulsing a DC 1kV source. The circuit I used is the following:
Clearly, this circuit is intended for an AC input that has both positive and negative halves where as in ...
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How to trim offset of a folded cascode op-amp when different voltage in applied to the input portion?
When the common mode input voltage is varied, offset is also varied. How can I trim them without using any pot?
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Voltage-controlled amplifier output offset
I'm testing a voltage controlled amplifier circuit in a simulator. The circuit is powered by a single 9V supply, so a "virtual ground" equal to 1/2 VCC is used. I have a question about the ...
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AC coupling to center an oscillating waveform to 0V doesn't work
I have a simple sawtooth oscillating circuit that I would like to center to 0V (remove the DC component.) I have tried AC coupling but the output is still a little to high and not centered. Could ...
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Measuring AC current with Raspberry Pi Pico [duplicate]
I need to measure the voltage from a current transformer with a Raspberry Pi Pico, but it outputs both positive and negative voltages, so I need to offset it.
Can anyone recommend me a simple op-amp ...
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209
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How to generate -5V to +5V from 0-10V input with direction signal
I have a motor controller that requires +5V to -5V for speed and direction. The trouble is, the output from the driver is 0-10V speed with a TTL 5V direction control. 0V in one direction and 5V in the ...
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DC offset charging using battery's own voltage?
Pardon my awful drawing, I also omitted any voltage regulator going into the battery for simplicity. I have an extremely low (0-1.25V) "generator" DC source that raps up to that voltage and ...
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Operational amplifier offset capacitor setting
I have a circuit:
How should I choose the value for the capacitor in offset? How large should it be?
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377
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How to size a differential amplifier for minimal offset?
What is the strategy for optimizing the offset of the differential amplifier in addition to increasing the size of the cross-coupled transistors? Are there any sizing rules to follow to size the ...
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DC offset of DC signal with op-amp
I have a DC signal from a DAC in the range of [0:3,3]V and want to convert it to be in the range [-5:5]V. My approach would be to scale with op-amp with gain 3 and then DC offset.
I've read that this ...
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Generating +/- voltages for biasing an opamp using a digipot
I am trying to generate a programmable bias voltage for a non-inverting opamp using a digital POT with an up/down interface as putting a micro in the circuit is not feasible.
I have come across a wide ...
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Measuring <10 pA of photocurrent using transimpedance amplifier
I am working on a project that measures low intensity light.
The photodiode I am using an OSD35-5T. This is a large surface area photodiode. The idea is that the large surface area would absorb/...
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Impedance problem on MCU ADC input line
I am working with an EFM8UB10 20QFN 8bit MCU from Silicon Labs, using the 10-bit ADC feature.
Due to a change in the PCB design, the trace to the ADCin port (P0.7) has increased about 20x in length (...
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AD8065 Offset problem
I'm an electronic engineering undergrad and your discussions helped me a lot. As a project, i was instructed to design the front end for a data acquisition system. The specs as below.
Supply +/- 5V ...
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what's thsi register Address: "16’b11_0_1_0nnn_0001_0011" stands for?
I'm learning a "PHY full rate clock divider configuration register" and it represents its register Address as 16’b11_0_1_0nnn_0001_0011
I think 16 stands for bit number, ...
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349
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ADS1230 shows a large offset
I'm using an ADS1230 for measuring the output of a pressure sensor (MPXM2053). The schematic of the circuit is shown below and some voltages are as follows:
AVDD = 3.304V
DVDD = 3.304V
Common-Mode ...
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833
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Op-amp output voltage offset
Hi i wanted to ask what causes an offset for the following integrator setup:
I`m no sure if its the virtual ground or another fundamental reason im not aware about since the signal should always be ...
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Offset and Bias current of Op Amp
Given this circuit :
OA3 is not ideal and has a bias current (5μA) and an offset voltage (10mV).The other two are ideal. I have to calculate the maximum deviation voltage on RL (load resistance). . I'...
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What happens to a signal when it passes by diodes that are connected antiparallel to ground?
What are diodes 1 and 2 doing in this schematic? This is the schematic for a distortion guitar pedal. Why doesn't all the current flow to ground through diode 2? How does diode 1 have any effect if ...
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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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Small output offset in square wave generator using LM741
I am building a square wave generator using LM741 just like in this Falstad simulation.
My problem is that the output has a small offset and I don't understand where it comes from.
When measuring ...
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What are the disadvantages of using an adder instead of a clamper?
I must use an offset an AC signal to measure through ADC. The traditional way or most of the resources point me to use the following clamper circuit:
However, I also see that the following adder ...
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Generating a reference voltage of 1.65V (half of 3.3V)
I am trying to measure an AC voltage using an ADC. However, the ADCs I know only measure the positive voltage. Hence, I am thinking of converting the AD to DC with an offset using the following ...
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217
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Why do I see voltage offset in this circuit?
I am trying to measure AC voltage with the help of a 2mA/2mA current transformer with the following circuit. It seems to work fine.
However, we can see that the secondary of the transformer is not ...
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318
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Sinking and sourcing problem for buffer
Let's assume that I am using a buffer for a sensor output (V1) in the kHz domain. The output of the buffer will be ideally equivalent to the sensor voltage. There will ideally be no current coming out ...
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Tradeoff between (op) amplifier voltage range and offset and settling
I know that an amplifier (let's take an op-amp) can't swing rail-to-rail. The reason has to do with the load device. For example, in a normal common gate/common base amplifier, the load device causes ...
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What is systematic offset?
I am bit confused about what exactly systematic offset is. I understood that generally offset could be due to two reasons:
Random offset which could be due to mismatch in size of transistors or any ...
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How to design an offset cancellation circuit for strongARM latch? [closed]
I have been working on a strongARM latch and I wanted to add a subsystem for elimination of the offset. Circuit diagram is attached with this question. For simulation purpose I have added an external ...
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Add an offset of 2.5 V to analog signal
I can't add an offset voltage 2.5 V to my analog signal. The circuit is attached.
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C code to MIPS (offset)
Suppose $t0 stores the base address of word array, $s0 is associated with position, and $s1 is associated with offset.I have to convert the following program segment into Assembly and write down the ...
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Offset problems with charge amplifier
I have a question about designing a charge amplifier.
I am currently using this simple setup for my application. As input, I can use several commercial piezo-based accelerometers. I need a pretty ...
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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 ...
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350
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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 ...
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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, ...
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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 ...
