Questions tagged [sampling]
Periodical measurement of an electronical property of a system, most often voltage.
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Sample and Hold IC specification
I am currently designing my 3rd year project in EE. I have an MCU with an ADC that samples at 15 kHz. The signal I want to sample has a 0.5 µs rise time which is equivalent to a bandwidth of 700 kHz, ...
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Oscilloscope Low Sampling at uHz Sinus Signal
I tried to measure a sinus signal at 1000 µHz with my R&S RTC1000 oscilloscope (bandwith 300 MHz). The function generator that I used was the EDU33212A. I set the T/div=100s and the oscilloscope ...
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Oscilloscope Total Record Samples Vs Signal Frequency
I have the oscilloscope R&S® RTC1000 at 300MHz / 2GS/s / 500Mpts (Mega Points) with 12 horizontal divisions on the screen.
1st Example:
If I have a signal 1Hz the total samples that the ...
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Sampling frequency of ADC and maximum frequency of input signal
As pair the datasheet of LTC2207, maximum input frequency can be 700MHz. whereas the sampling frequency is 105MSPS. Two times 700MHz is way less than 105MSPS. So how is this not contradicting with ...
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Help with inverse Z transform
I have the following function on time domain
$$f(t) = sin(100 * 2 * \pi * t)$$
and I need to get its discrete values when it's sampled at 1000Hz.
After applying the Z transform and using T = 1/1000, I ...
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Do industry true RMS volt meters use a transformer?
I'm trying to build a true RMS volt meter that plugs into my 120 RMS outlet. Since I want to do it safely, I'm using a very handy transformer (ZMPT101B AC voltage transformer module) that takes the ...
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Delta Sigma Modulator for 2/3 Multi modulus divider used in FracN PLL
I have been trying to implement a Delta Sigma modulator for a 2/3 Multi Modulus divider. I am referring to Riley's paper: https://ieeexplore.ieee.org/stamp/stamp.jsp?arnumber=229400
I have designed ...
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How can the ADC bandwidth be higher than the sampling rate?
From a hobbyist perspective, the sampling rate of an ADC must be at least twice of the input signal. As I was looking for an ADC to digitize a demodulated signal, I found that some ADCs like the ...
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How to measure and sample oscillations in a LC tank using a Microcontroller
Since the oscillations in a LC tank starts with high amplitudes and dies gradually, and since the first oscillations are to some extent unpredictable in amplitude, how can one measure and sample such ...
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Arduino's impedance in breadboard circuit
(Warning, as this is a long question, asked by students that don't know what they're doing. Perhaps our questions are too general and can't be answered but at this point we'll take all the help we can ...
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Reason for the degraded I2S signal
I'm working with one of the devices from the NXP's IMX family - the IMX93 evaluation board.
I've managed to setup the sound card drivers already, the next step was to test I2S signals output via the ...
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SDR Bandwidth and sample rate
I saw that SDR has two parameter: bandwidth and sampling rate. I would like to know the difference between them because i saw a 56MHz bandwidth SDR but by looking at the chip used inside the sampling ...
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How to properly compute noise power spectral density?
I am confused about two different definitions of Power Spectral Density (PSD) that I have seen online.
The first comes from the National Instruments LabVIEW documentation (1):
$$
PSD = \frac{PS}{\...
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Effect of 2ASK Sampling Points on Bit Rate
“I reduced the only one sampling points while using 2ASK modulation, and the bit error rate increased by 20%. Can you help me with this?”
Question happens in this line: ...
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Digital Low Pass Filter and PWM Signal
I have a PWM signal going into an ADC.
After the ADC the signal is being filtered using an IIR single pole filter.
Performance is exactly what I want with one exception. The purpose of the filter is ...
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