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I am looking for an expert in COMSOL Multiphysics to tutor me. I do have very good knowledge, but the problem I am seeking to model is a little bit complex.
Let me ask the question in another way. Assume I am using the Lock In with a reference frequency f0=200 Hz. Also assume the Lock In low pass filter is adjust so as its cut off freq. fc >> f0 Hz. I bias a resistor and measure the output. Experimentally, we will see the 1/f noise in the output...
The Lock In amplifier uses Phase Sensitive Detection to "lock" to the signal using reference frequency. It is basically auto-correlation. The output of the Lock In amplifier is typically an X signal, the in-phase, and a Y signal, the out-of-phase.
My question: If the Lock In 'locks' to the...
No, with Whetstone bridge the voltage output is ideally zero, since we choose the variable resistance to be equal to the sample resistance (2 Terminal). We are not using the bridge to determine the resistance, we do know the resistance, we simply record any deviations from zero. We can't do that...
@Chuckey Your method doesn't work because the film is not uniform; its resistance is 10 times higher along one direction than along the other. Also, with regard to the technical details you provided, I don't think I'm going to use DC. I use AC Lock-In amplifiers that can measure the signal more...
So you are suggesting two parallel bridges, one for each two corners? This is two 2-terminal measurements, still has contact resistance.
The other arms consists of high quality resistors with minimal noise (other than thermal noise). My device resistance is hundreds of ohms, contacts are...
I have an almost squared thin film with 4 contacts along the corners. Using 4-probe measurement, I can eliminate the contact resistance. On the other hand, Whetstone bridge can be used to record resistance noise as a function of time (because the balanced bridge will have zero output voltage, so...
I have a time-domain signal, and then I applied some Power Spectral Density methods (e.g. Welch's) to find the PSD (i.e. the power spectrum). This power spectrum, in my case, ranges from ~ 0 to 8 Hz.
I want to extract certain bands from this spectrum, e.g. first band is 1-2 Hz, second is 2-4...
I use a 256 samples/sec ADC to measure some time-series voltage signal. The ADC stores the data points (total of N points) and then once the measurement is done, it transfer them to the PC. We have a C++ program that do some DSP. Specifically, it do three stages of Kaiser-based FIR filtering...
Thank you, I see your point. However in page 11 you can see that this third pole is actually to the right of the 2nd order poles, so it should not and cannot be neglected. What do you think?
I am reading "[Small Unmanned Aircraft: Theory and Practice]" (page 7). We have the following Transfer Function (TF):
\[\phi(s)=\frac{a_{\phi 2}}{s(s+a_{\phi 1})}(\delta_a(s)+\frac{1}{a_{\phi 2}}d_{\phi 2})\]
where \[\delta_a\] is the output signal to the actuator and \[d_{\phi 2}(s)\] is an...
Hello,
I am trying to convert a Matlab code that do some communication algorithms into an HDL code, using HDL Coder.
Alongside the code I have a binary file to work on it, emulating a real-world situation where the algorithm will be working on real data coming out
of a front-end module (ADC...
The final design will not be mass produced. So probably this is a plus on my side.
But still, 1440 attempts per day is too much (~half a million attempts in a year).
I should think of another way. Thanks anyway.
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