Digital Chirp signal BW

[mr_byte31]

Hi Folks,

I have a pulsed signal and I would like to measure the BW of the high power frequencies in it as shown in figure below. The shortest pulse shall be in 100 us.
I will build a circuit and will use a microcontroller for that.

The signal looks like a chirp signal but somehow in digital fashion with DC offset. I can see the frequency of the signal increase with time so I called it digital chirp signal. I don't know if it has a scientific name or not !



I thought of the following techniques:

• collect samples via ADC and use FFT to figure out the high power frequencies and measure the BW.
• use pulse discriminator to figure out the positive edges and measure the time between them
• use zero crossing circuit and measure the time as point above
• use PLL and measure the voltage before the VCO to figure out the frequency ranges

is there a simpler or more recommended solution for such problem statement ?

[radiolistener]

You can measure rise or fall time (which is more fast) with oscilloscope and then calculate bandwidth:

BW_MHz = 350 / rise_time_ns

But oscilloscope needs to have high enough bandwidth, otherwise oscilloscope bandwidth will limit your measurements.