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clock from a chip (50) MHz almost sinusoidal - why?

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harshad

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explanation

hello ,
I tapped a clock from a chip (50) MHz ,found it to be almost a sinusoidal waveform
Can it be because of loading .
Correct me if i am wrong
 

mr_ghz

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Hi harshad,

How have you measured this frequency? With an oscilloscope? Which
bandwidth does it have? What probe do you use?
Normally frequencies in this range have to be measured with special
equipment. If you use an oscilloscope with a standard probe, the
capacitance is that large that higher frequencies are damped. So your
signal appears to be a sinus (50MHz), because all overtones (that make
a square 150MHz, 250MHz, ...) are damped.

Bye
 

kinysh

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yes,
except for that ,make sure the power to the chip is good.
ie the power is well decoupled.
otherwise this could also happen.
 

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