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Data acquisition hardware for a ~50 kHz signal to import it to PC/do FFT

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As the title says, I have FMCW system and it outputs single-ended IF signal, frequency ranges from 1 kHz to 50 kHz (and a sync). Now, I want to capture it on PC, import it to Matlab and do an FFT or have an MCU do FFT. Now, my web searching skills clearly fail me because all I get are expensive "data loggers" and DAQs as such but I need something simple and efficient. I know I could build ADC+MCU that will do FFT but designing that will take much longer.

So, I guess, my question is: what inexpensive hardware can I use to capture 1 kHz-50 kHz signals?
 

Hi,

The cheapest maybe is an audio ADC.
There some with 192 kHz sampling rate. But usually (and unfortunately) they will use an LPF with something about 20...25kHz. Check datasheet on max frequency range.

But there are many IO cards and USB scopes.

But before you select one you should decide your specifications.
Now we know just the frequency.
But you need: voltage range, waveform, expected sampling frequency, number of channels, resolution, filters, interface .. and so on.

Klaus
 

The cheapest maybe is an audio ADC.
There some with 192 kHz sampling rate. But usually (and unfortunately) they will use an LPF with something about 20...25kHz. Check datasheet on max frequency range.
Click to expand...
Usually the filter cut-off frequency of the audio adc is about 0.45 fs. You need 120 kHz fs for 50 kHz bandwidth.
 

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