Thats not very useful when you want the 4th harmonic as its amplitude is
zero fro a 25% duty cycle.
Using a duty cycle of 1/8, 3/8 or 5/8 will maximise the amplitude of the
4th harmonic.
see:
http://www.wenzel.com/pdffiles1/pdfs/choose.pdf
Bruce
Max Robinson wrote:
If you start with a square wave odd order is all you can get but if
you start with a pulse with a 25% duty cycle you can get even order.
It's best to optimize the pulse width for the harmonic you want.
Regards.
Max. K 4 O D S.
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----- Original Message ----- From: "Nick Foster" <[email protected]>
To: <[email protected]>
Sent: Tuesday, February 09, 2010 6:35 PM
Subject: Re: [time-nuts] Low phase noise VCO
From: [email protected]
To: [email protected]
Date: Tue, 9 Feb 2010 18:24:39 -0600
Subject: Re: [time-nuts] Low phase noise VCO
Which leads me to ask a novice question:
Why not pull a 16 MHz crystal and multiply to 64 MHz?
If you count down from 64 to 10 MHz, isn't the multiplication inside
the
PLL?
Perhaps the noise is multiplied by 4, but would it work for the
intended
purpose?
Bill Hawkins
Can you do x4 multipliers? I thought odd-order harmonics were usually
used for multipliers. I'd be happy to be wrong!
Nick
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