Recent content by SK1.618

I thought a voltage divider simply divides a voltage signal by a constant value. I have x2 voltage signals, slowly varying between 0V and ~5V. I record these for about 1s at a sampling frequency of ~10^5 Hz. I then divide the digitized signals in software. What I would prefer to do is divide...

I know that a differential amplifier is used to effectively subtract one voltage signal from another (and amplify). However, are there any devices or techniques that can be used to electronically divide two voltage signals? Thank you

If \hat{U}(r) = e^{\hat{A}(r)}, can we say \frac{d\hat{U}}{dr} = \frac{d\hat{A}}{dr}e^{\hat{A}(r)}?

I have a range of sine waves I have obtained in an experiment. I want to put a measure on the purity of these sine waves - how well the reproduce a theoretical sine wave. Is there anyway I can analyse the FFT of the sine waves in Matlab and put a measure on the purity of the sine wave...

From what I have read, FFT seems to simply be faster than DFT, thus making DFT redundant. However, if computational speed is not an issue, are there any advantages of using DFT over FFT (such as increased precision, for example)?

What is a typical carrier frequency for amplitude modulation? In particular, for amplitude modulation in spectroscopy.

See attached PDF for details: How do I calculate errors on the fit parameters, p?

Homework Statement Show that three controlled-NOT gates (for a 2 qubit system) can be combined to form a SWAP gate. The control qubit alternates between the 2 qubits for each consecutive c-NOT gate. (The diagram is Figure 5 of the following notes...