Questions tagged [offset]

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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 ...
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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 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 ...
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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 ...
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 ...
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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'...
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 ...
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 ...
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 ...
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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 ...
-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 ...
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.
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 ...
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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 ...
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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 ...
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 ...
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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 ...
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 ...
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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 ...
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 ...
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-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,...
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 ...
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 ...
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 ...
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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 = ...