Questions tagged [drift]

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Diffusion current causes drift current?

I was studying about currents in an injected semiconductor (by illumination) from Integrated Electronics by Millman and Halkias. They consider the diffusion hole current in an injected n-type open-...
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1answer
85 views

Drift auto-corrector for any microcontroller [closed]

I've made multiple microcontroller circuits in the past, but now when I look at everything, drift has become a problem. I know this when I try to connect two micros together serially via wireless ...
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2answers
52 views

Looking for gyroscope drift spec in datasheet

The product page of the BMI088 IMU makes the very impressive claim The automotive-proven gyroscope of the BMI088 has an unmatched bias stability of less than 2°/h However, I can't find this claim ...
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1answer
43 views

mpx5010 drifting

I have a MPX5010 pressure sensor that outputs a voltage proportional to applied pressure. Output is connected to an amp-op with gain=4 so my output is around 1V when no pressure is applied. That ...
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1answer
49 views

Calculating drift/precision on a temperature circuit

I'm hoping to get some guidance with a circuit I designed. I have a current source which operates between 200uA and 400uA. In order to measure it, I used the following circuit before feeding it into ...
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1answer
61 views

Thermal drift in diodes

Hi guys and thanks for reading and your help. I can't understand a thing that my book says: "When the temperature grows, the diode will let flow more current" and then it gives 2 formulas: \$V_t = \...
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2answers
79 views

Obtaining noise spectral density of OP-AMP from Peak to Peak voltage

I'm in need of a low offset opamp for integrating purposes, I also need it to be very low noise since the output of the opamp will go into a 3000 V/V gain stage. The opamp that seems to satisfy my ...
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2answers
67 views

LDO ground with Diode for temperature Drfit compensation

I work the below circuit. LDO is 3.2V fixed , Two diode is connected one at output and one at ground for compensate the temperature drift occur. Op is connected to a micro controller VDD-BUS which ...
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1answer
230 views

Integrator DC drift

I have to integrate signals very precisely, and Im facing DC drift on inverting integrators using opamps. The usual cure is to add a resistor in parallel with the capacitor, however this produces a ...
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1answer
32 views

Investigating the cause of the drift for this system

A force-torque transducer data acquisition system is shown below: As shown in the above illustration, basically a six-axis transducer is powered and amplified by an interface electronics and then the ...
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2answers
200 views

In a DC circuit with one battery and one resistor, why does the voltage drop remain the same irrespective of the value of the resistor?

DC Circuit#1: I have a 10V battery connected to a 10 Ohm Resistor. Therefore, the current will be 10/10 = 1 Amps DC Circuit#2: I have the same 10V battery connected to a 5 Ohm Resistor. Therefore, ...
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1answer
275 views

Large drift (temperature could be a culprit) in this circuit. Anyone can help?

Purpose: Amplify the differential voltage out of a bi-cell photo-diode. Amplification has to have a high gain as we are looking into nm level displacements of the IR beam centroid emitting the bi-cell ...
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2answers
633 views

Can an NTC sensor drift over time?

I was reading stuff on NTC self heating and I was thinking if the thermal runaway is something that could really affect a measurement. So, not an offset, but actually a drift on the resistance. So I ...
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1answer
97 views

Some questions about drift at the output due to transducer or amplifier

I have instrumentation amplifier box/circuit using a INA128 amplifier. Inside the same box the output of this goes to another amplifier for a larger modifiable gain. All this is used to amplify a ...
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0answers
51 views

Check if signal drifts are temperature related

Let’s say I have an output signal vs time plot data of some opto-electrical device (a black box for me). If the device is exposed to sunlight the signal starts to drift to higher values. Is there a ...
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2answers
207 views

Minimizing frequency drift in LM331

Below is the schematics of a circuit so far I finalized and soldered on a perfboard: (please left-click to enlarge) Basically the circuit converts 0...10V input voltage to 10mV pk-pk square-wave. ...
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1answer
116 views

Compensating for MEMS Gyroscopic drift

I'm new to IMUs and know that they are prone to high drift, which depends on Temperature, White Noise and Time, but the most uncertain drift is caused by time, and under certain circumstances, drift ...
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0answers
964 views

How can the temperature drift in this unusual absorption detector be reduced?

I am using this simple circuit in a sensitive hand-held probe to detect metals in the ground. It works very well except for the temperature drift. The drift means having to often re-adjust P1+P2, ...
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3answers
2k views

Output Drift of an operational Integrator

R = 1k and C = 0.1 uF In practice, the output of and operational integrator will (drift) until it saturates at a value close to one of the supply voltages, even when the input voltage (Vin = 0). Why ...
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4answers
2k views

LED intensity changes with time

I want to operate a UV LED at continuous 20mA for one week. However, when I measure the LED intensity with a photodiode (see image), I find that the light intensity changes continuously in time. I ...
6
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2answers
1k views

Why do compass chips in cellphones require frequent calibration?

Most cell phones offer digital compass functionality which uses a 3-axis magnetometer chip for data. Phones (some more than others?) frequently require the user to "recalibrate", which involves ...
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2answers
209 views

DS1307 timekeeping date significance (leap seconds?)

As part as a hobby project I built a relatively simple BCD binary LED clock using a PIC micro controller and a DS1307 RTC. Upon battery power loss the DS1307 resets back to 01/01/00 00:00:00 which ...
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2answers
275 views

what is the base temperature when using ppm/c

I am not sure If I have phrased the question right but if not please correct me I want to know when Accuracy Parts per Million mentioned in the datasheet of voltage reference they say for example 5 ...
2
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1answer
971 views

resistor drift via temp messing with ADC readings in voltage divider

I am voltage dividing 0 to 64 VDC down to 0 to 1.8 volts via a simple voltage divider. I am using 1% resistors. The problem is that the readings from the ADC in my beaglebone black seems to be ...
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1answer
585 views

Voltage Drift on an Open Circuit (and how to get rid of it)

I'm trying to create a custom lick-port to detect mouse licking behavior. I am following a design published here that uses the junction potential between the mouse's tongue and the metal water spout ...
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1answer
300 views

Typical Resistance Temperature Coefficient Variance between a reel of same value resistors

I have a resistor divider, I'm interested calculating the drift of the divider over temperature and if possible minimizing it. I was wondering if both resistors in the divider have the same value ...
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1answer
311 views

How does the CMRR of difference amplifier ICs change over time?

When designing precision analog circuits, I often come across parts which seem to be more than accurate enough for my purposes, but where the datasheet does not specify how key parameters will change ...
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1answer
854 views

Electron speed in resistors

What affects the speed of electrons in a resistor? If two resistors are connected in series, they both have the same current ; same amount of electrons passing at a point per second. Then if one ...
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1answer
187 views

Tactile pressure sensor and drift. Reading the datasheet

I am looking at the specs of tactile pressure sensor and I can't understand what this means: "Drift: <3.3% per logarithmic time scale" How should I understand this? Does this sensor drifts a lot ...
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2answers
2k views

Relation between drift velocity & conductivity of a doped semiconductor

Here is the problem, and I am stuck. When an electric field with strength \$1 \times 10^3 \text{V/cm}\$ is applied to a p-type uncompensated Si sample at room temperature, the electron drift ...
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2answers
1k views

How important is the temperature stability for gain - setting resistors?

When two resistors are used to set a gain of an opamp, do I need to care about their temperature stability, provided resistors are from the same series, same manufacturer? Let's say my circuit will ...
2
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1answer
2k views

Cancelling drift of a gyro by mounting?

I am trying to design a device that is used for capturing rotation. I think I will be using an IMU from Invensense, as I have a few of them to play with. A big problem gyroscopes seems to be drift, ...
2
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1answer
2k views

Gyroscopic Drift Correction

I'm currently working on a project where I am pulling readings from 3 Gyroscopes (STM L3G4200D) to a Microcontroller (TI MSP430) and sending orientation data to the user. I've been reading up on ...
2
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1answer
2k views

ds1307 drift too big

I have a RTC ds1307 mounted on a prototype board ( the one with 3 pin stripped ), and I'm experiencing a delay of about 5 sec/day, far too big compared to some research I did. Can that delay be caused ...
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4answers
3k views

Basic Frequency Control Circuit

How does R4 prevent the output voltage drifting towards one of the supply rails to the op amp? I understand that R4 has to have a high resistance but I do not know why? Here is the schematic which is ...
2
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3answers
8k views

What does the term “slow drift” mean?

Good night everyone. I came across the term "slow drift" when reading a paper on an electronic design, and I am not quite sure what it means. The author said he used a low pass amplifier to remove ...
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4answers
4k views

Calculating error between two clocks?

I have a clock. It generates ticks. I want to know the error in PPM relative to another clock, so I count the ticks. Let's say the oscillator is 1 MHz (for simplicity). I should count 1,000,000 ...