On 11/04/2012 01:13 AM, Peter Gottlieb wrote:
Of course you can't have a perfect square wave! That would imply zero
transition time
... oh, THAT would be useful! :D No trigger point jitter!
... and it would be a hell to contain within the cables and connectors
we have, as they leak a lot as you get up into frequency.
and since frequency is inverse to time that implies
infinitely high frequency bandwidth is required to achieve that perfect
square wave. Getting a "square" wave with a "fast enough" slew rate
between high and low levels is certainly achievable and better than that
perfect square wave. Be careful what you ask for, because with a perfect
square wave you would have such high frequency content that you would
get induced noise everywhere.
Indeed. Bob has shown this.
Another aspect of it is that phase-shifts at higher frequencies may eat
into the phase shift of the zero transition, so it may for some systems
give a worse environmental/temperature dependence than a sine would.
Then again, if you check your signal properly, a square-wave may be
exactly what you want and need. It's just that again, your milage may vary.
Cheers,
Magnus
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