Hello,

I just want to know if it's possible to measure a high frequency of a signal (about 900Mhz) with the Mbed. I didn't find anything about that in the website. That's why i ask for help to specialist.

I'm waiting for assistance.

Thank you in advance, have a nice day.

RJ

Of course you can, provided that you can downconvert it to a range that mbed can measure accurately.You can either use a PLL with a divider or just built a superhet converter from scratch.

Dimiter

You can use for example LMX-series from Natioanl Semiconductor as divider in order to be able to measure hundreds of MHz.

Example LMX2324 (max 2 GHz). You can find these chips in old mobile phones. Division ratio could be 1000 or 10000. (you could set these ratios from mbed over a serial port) and on an interrupt pin count the output from LMX.

what kind of measurement are you interested in? Do you just want to measure the frequency (with disregard to waveform), or do you want to measure the actual 900MHz waveform (ie shape, amplitide, phase etc..)?

Thank you for all your replies.

We are interested to measure the frequency with disregard to waveform. We just want to know the frequency of a signal.

Is this is possible with the mbed? And is there any examples on the website?

Thanks

See here and here.

I hope that helps.

Hi, I want to mesure a frequency of about 10-12MHz. Have a good day