Questions tagged [offset]

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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 ...
• 19
1 vote
103 views

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 ...
• 19
1 vote
85 views

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 ...
• 65
52 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 ...
188 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 ...
• 113
363 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 ...
190 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 ...
• 113
875 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) ...
• 289
1 vote
73 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. ...
1 vote
108 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 ...
491 views

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 ...
123 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 ...
• 339
595 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 ...
1 vote
305 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?
108 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
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 ...
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 ...
• 1
1 vote
198 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 ...
144 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 vote
120 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?
320 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 ...
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 ...
294 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
126 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
72 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 (...
158 views

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 ...
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, ...
• 125
1 vote
320 views

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 ...
• 121
802 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 ...
• 388
178 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'...
• 301
1 vote
451 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 ...
1k 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 ...
• 1,201
349 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
163 views

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 ...
• 862
1 vote
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 ...
• 862
1 vote
209 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 ...
• 862
291 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 ...
76 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 ...
• 1,326
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 ...
• 659
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 ...
• 659
780 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.
125 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 ...
300 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
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 ...
1 vote
306 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 ...
• 125
445 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, ...
107 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
165 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 ...