8 Apr
2005
8 Apr
'05
12:11 p.m.
John wrote:
Should a scope rating 2X the computer clock speed keep
the
readings useful?
Marginal. Square waves consist of odd harmonics. A 100 MHz scope
is going to have a *lot* of attenuation at 150 MHz, so a 50 MHz
square wave that in reality has fast edges will look like a sine
wave on the scope.
Fast edges in general have very high frequency components, so a scope
is going to round them at least somewhat no matter what you do. But
I'd recommend at least 4x more bandwidth than the highest frequency
digital signal you want to examine.
Eric