12 votes

Can the frequency of voltage change throughout a circuit?

In a Linear, Time-Invariant (LTI) system, the frequency will not change. An excitation at 2 Hz will lead to effects at 2 Hz throughout the system. Circuits consisting only of linear, time-invariant ...
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  • 13.7k
8 votes
Accepted

Are microphones with flatter frequency response charts better at picking up frequencies?

In general, the frequency-measurement would be quite accurate even with a low-quality microphone. This would only be affected by the accuracy of the clock used to control the sampling in the analog-to-...
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  • 718
6 votes

What is the tradeoff in decreasing the frequency bandwidth when reducing noise of a resistor?

It depends on your application. You need to provide the bandwidth that your application requires. If you reduce the bandwidth below that value, you will reduce the resistor noise at the expense of ...
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  • 14.9k
4 votes

Can the frequency of voltage change throughout a circuit?

Ideal resistors, inductors, and capacitors are linear components. So via the superposition property of linearity, and therefore superposition of frequencies (like Fourier), no new frequencies will be ...
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  • 46k
3 votes

What is the tradeoff in decreasing the frequency bandwidth when reducing noise of a resistor?

It all depends on the application. If you're building an audio amplifier and want to minimize thermal noise, you can decrease the bandwidth of your amplifier. The tradeoff of course is that you can'...
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  • 19.5k
3 votes
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Matlab: using a small sample time for sine wave, makes the wave's frequency "accelerate"

Any idea why this is happening?' Aliasing how can I fix it? Always use a sample rate above the Nyquist rate for the frequencies contained in your signal. Preferably by at least a small multiple (...
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  • 121k
2 votes
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Square wave distortion at low frequencies, high-pass filtering, AC coupling

In DC mode a scope will show whatever the voltage on the input is, if it's 1 VDC you will see a flat trace at 1 V (assuming the range is set accordingly). In AC mode a capacitor is put in series with ...
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  • 3,396
2 votes

What is the tradeoff in decreasing the frequency bandwidth when reducing noise of a resistor?

Halving bandwidth is the same as taking two measurements and averaging them together. The trade off is that it takes twice as long and you'll potentially average away any rapidly changing component ...
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  • 10.4k
2 votes

Are microphones with flatter frequency response charts better at picking up frequencies?

You can actually find measurements of how accurate different audio interfaces are at measuring absolute frequency online. This review for example notes that the product measured accurate to 0.0018% ...
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  • 10.4k
1 vote

Peak/envelope detector circuit for 30 MHz sine pulses with a 10 kHz PRF

Your concerns are correct, that the 1N5817 diode has too much capacitance to rectify 30 MHz as it is rated for 1A. Since diode capacitance reduces with current rating, use a fast low current signal ...
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1 vote

Mimic a thermistor/variable resistance signal using PWM

I think for the first step, if you want to mimic something, you must know what the original one is. As far as I know, the "signal" provided by a thermistor is normally "sensed" ...
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  • 11
1 vote
Accepted

Square wave distortion on low frequencies

This most likely isn't a problem with your waveform generator, but with the oscilloscope you're measuring it with. I'm not familiar with Owon scopes, but I assume that this ~ symbol here: refers to ...
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