Questions tagged [offset]
The offset tag has no usage guidance.
121
questions
1
vote
1
answer
56
views
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?
0
votes
2
answers
55
views
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 ...
- 25
5
votes
2
answers
1k
views
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 ...
0
votes
0
answers
38
views
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 ...
- 1
1
vote
2
answers
141
views
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 ...
0
votes
1
answer
95
views
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 ...
- 1
1
vote
2
answers
82
views
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?
0
votes
1
answer
64
views
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 ...
- 1
3
votes
2
answers
697
views
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 ...
3
votes
3
answers
120
views
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 ...
- 161
0
votes
0
answers
61
views
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/...
- 161
-1
votes
1
answer
60
views
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 (...
0
votes
2
answers
83
views
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 ...
- 11
0
votes
1
answer
36
views
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, ...
- 115
1
vote
1
answer
161
views
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 ...
- 21
3
votes
3
answers
562
views
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 ...
- 139
0
votes
2
answers
126
views
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'...
- 191
1
vote
3
answers
224
views
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 ...
1
vote
1
answer
109
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 ...
- 869
0
votes
1
answer
151
views
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 ...
- 43
1
vote
1
answer
127
views
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 ...
- 829
1
vote
3
answers
863
views
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 ...
- 829
1
vote
2
answers
153
views
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 ...
- 829
0
votes
2
answers
123
views
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 ...
- 47
0
votes
0
answers
60
views
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 ...
- 1,260
3
votes
5
answers
2k
views
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 ...
- 659
-1
votes
1
answer
513
views
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 ...
- 659
0
votes
2
answers
405
views
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.
- 11
0
votes
0
answers
89
views
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 ...
- 1
2
votes
1
answer
206
views
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 ...
- 43
0
votes
1
answer
898
views
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 ...
- 3
1
vote
1
answer
152
views
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 ...
- 75
0
votes
1
answer
304
views
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, ...
0
votes
1
answer
80
views
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 ...
1
vote
3
answers
131
views
Why does the bias decreases in this clamper circuit?
I'm trying to do a positive clamper circuit in easyeda.com to bias a triangular signal of 200mV pk-to-pk at 1kHz centered around 0V. Here's the circuit:
The bias seems to work only during the first ...
-2
votes
1
answer
576
views
how to give dc offset to the square wave from 2.5 v to -2.5 to 5 to 0 volt?
a)I want to change my square wave signal from -2.5 to 2.5 volt to 5 volts to 0 volts? actually this will be given to MOSFET driver ir2110.
b) In the first picture, it is my original square wave coming ...
- 23
1
vote
0
answers
119
views
Rressure sensor offset removal
I have a pressure sensor that has 200 mV offset. I wanted to remove this offset and double the result (to remove any present noise) so that be able to calibrate the sensor easier. So far I have used a ...
- 59
1
vote
2
answers
174
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 ...
- 13
1
vote
2
answers
138
views
Help selecting feedback and ground resistors for a gain and offset circuit
I have an input signal from -3.3V to 3.3V and the ADC I would like to use can only read from 0 to 3.3V.
I also have access to a stable source of power at 3.3V.
From previous visits, I have tried to ...
- 11
1
vote
2
answers
470
views
Low pass filter offset voltage question. LM358, INA129
I am designing a low-pass anti aliasing filter. I have set my cutoff frequency to be at 500Hz, and my sampling frequency at 1000Hz, but I'm not that far yet.
I designed a 4th order butterworth low-...
- 115
0
votes
1
answer
219
views
Attenuating op-amp circuit with offset
I am designing a non-inverting op-amp circuit that maps an input signal (V3) 0-3.3V to an output signal (Vo) 0.2-2.4V. I opted to offset the output up by 0.2V and then used a second op-amp circuit as ...
- 3
0
votes
1
answer
109
views
Need help calculating current and understanding Vos in an op amp
I'm trying to solve a circuit that uses an op amp with a +-4mV offset but I've run into two problems trying to find output offset voltage.
When looking at the solution to the problem, I noticed that ...
- 37
-1
votes
2
answers
49
views
Offset Voltage at Op Amp Inverting Terminal
I'm using ADA4350 as a transimpedance amplifier with various gains for feedback paths (30 ohms,3k,300k and 3 mega ohms respectively). When I give a constant current source of about 23mA as input to it,...
- 145
0
votes
4
answers
757
views
Offset when trying to convert square to triangular wave
Hi I constructed a circuit to create a 1Hz square wave with LM741 Opamp. The first part makes that and it makes it perfectly.
But I need to convert it to a 8Vpp triangular wave. Without any offset, I ...
- 11
0
votes
2
answers
375
views
How to remove/trim MCP4725 DAC offset? [duplicate]
I'm using MCP4725 (datasheet) module, VCC is connected to a 4096V reference voltage. there's a steady 23mV offset:
0 - 23mV
50 - 73mV
100 - 123mV
...
How can I ...
- 2,076
0
votes
1
answer
166
views
Electret microphone weird offset problem
Hi I am trying to amplify my output from electrec (analog microphone) with below design. When I used 1uF capacitor it has -300mV offset, so that I changed capacitor to lower value with trial-error ...
- 11
1
vote
1
answer
2k
views
Ground offset test
I need to perform a ground offset test. Ground offset = 1V
Please tell me whether my approach is correct.
Typ Input power supply to the circuit is +12V
Typ Load current for the circuit is 0.5A
So, I ...
- 3,885
1
vote
0
answers
100
views
PIC ADC Protection
I am working on a project that samples a 1 kHz signal @ 20 kHz, the signal is 5Vpp biased on +2.5V that way everything is fine.
I want to make a protection schematics to work along my offset. I am ...
1
vote
1
answer
420
views
Definition of the offset voltage for a single-ended op-amp
Let's consider an op-amp:
The book I'm reading says that, ideally, if the voltage difference between the two inputs is zero (thus vin1=vin2) then the output voltage should be zero. However, because ...
- 616
0
votes
2
answers
755
views
Active band pass filter + offset
I'm trying to know the fr equation for the following op amp configuration:
I have some capacitors values for specific fr frequencies:
fr = 34Hz -> C = 33nF
fr = 50Hz -> C = 22nF
fr = 160Hz -> C = ...
