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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 ...
Omnistic's user avatar
0 votes
1 answer
41 views

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 ...
Jesper Kragh's user avatar
2 votes
1 answer
154 views

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 ...
Tong Su's user avatar
  • 111
0 votes
1 answer
229 views

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 ...
Zunuran Nasrullah's user avatar
0 votes
1 answer
154 views

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 ...
Barzi2001's user avatar
  • 113
5 votes
4 answers
750 views

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) ...
Ömer Gezer's user avatar
1 vote
0 answers
69 views

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. ...
Christoph Madl's user avatar
1 vote
1 answer
78 views

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 ...
Developing Electronics's user avatar
0 votes
2 answers
368 views

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 ...
Developing Electronics's user avatar
0 votes
1 answer
101 views

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 ...
c.leblanc's user avatar
  • 339
2 votes
4 answers
475 views

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 ...
ShiroGeek's user avatar
1 vote
1 answer
246 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?
K. M. Sayem Bin Rahmotullah's user avatar
0 votes
2 answers
90 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 ...
Alex_G's user avatar
  • 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 ...
Charles Guilbault's user avatar
0 votes
0 answers
42 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 ...
BFG's user avatar
  • 1
1 vote
2 answers
186 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 ...
Dave McLaughlin's user avatar
0 votes
1 answer
137 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 ...
baraka's user avatar
  • 1
1 vote
2 answers
115 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?
Malum Wolfram's user avatar
0 votes
1 answer
248 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 ...
Gnawi's user avatar
  • 1
3 votes
2 answers
2k 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 ...
Ognyan Petkov's user avatar
3 votes
3 answers
225 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 ...
LabMat's user avatar
  • 161
0 votes
0 answers
105 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/...
LabMat's user avatar
  • 161
-1 votes
1 answer
71 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 (...
bearbearsocute's user avatar
0 votes
2 answers
127 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 ...
HasithaCG's user avatar
0 votes
1 answer
37 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, ...
Chen Li's user avatar
  • 115
1 vote
1 answer
286 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 ...
Kamin's user avatar
  • 121
3 votes
3 answers
779 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 ...
KMN's user avatar
  • 388
0 votes
2 answers
158 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'...
JustCurious's user avatar
1 vote
3 answers
413 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 ...
user199827463's user avatar
0 votes
1 answer
810 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 ...
DSP_CS's user avatar
  • 1,223
0 votes
1 answer
292 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 ...
PowerTb321's user avatar
1 vote
1 answer
157 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 ...
SKGadi's user avatar
  • 862
1 vote
3 answers
2k 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 ...
SKGadi's user avatar
  • 862
1 vote
2 answers
194 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 ...
SKGadi's user avatar
  • 862
0 votes
2 answers
248 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 ...
Tungstein's user avatar
0 votes
0 answers
75 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 ...
divB's user avatar
  • 1,316
3 votes
5 answers
3k 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 ...
Hari Krishna's user avatar
-1 votes
1 answer
1k 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 ...
Hari Krishna's user avatar
0 votes
2 answers
674 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.
Selim Ulusoy's user avatar
0 votes
0 answers
122 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 ...
Muskan's user avatar
  • 1
2 votes
1 answer
282 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 ...
phkloth's user avatar
  • 43
0 votes
1 answer
1k 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 ...
7down's user avatar
  • 3
1 vote
1 answer
255 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 ...
Lunde's user avatar
  • 105
0 votes
1 answer
429 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, ...
hikoruKazuto's user avatar
0 votes
1 answer
103 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 ...
sarra marmouche's user avatar
1 vote
3 answers
160 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 ...
Jérémy Talbot-Pâquet's user avatar
-1 votes
1 answer
774 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 ...
Arijeet Roy's user avatar
1 vote
0 answers
159 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 ...
V.Ajall's user avatar
  • 69
1 vote
2 answers
253 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 ...
Jones1403's user avatar
1 vote
2 answers
228 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 ...
Old Guy's user avatar
  • 11