Christophe Huygens wrote:
I'll bet your DDS will run at 80 MHz at room temp.
Since this a one-off project, test it to see if it
works to 80 MHz with some design margin. Now you
can cascade 3 doublers. The reconstruction filter
is now stop 50, pass 30 instead of stop 40 pass 30.
That is WAY easie
(Rick) Karlquist; time-nuts@febo.com
Subject: Re: [time-nuts] what is the best way to multiply a 10 Mhz signal?
Hi Rich
Thanks for the replyI have an AD9834 DDS chip I want to use for a
Frequency generator with an accuracy of 1 Hz from 0-30 Mhz. . This part can
be clocked at 75 Mhz - but u
This might explain a way to do it
http://physics.eou.edu/courses/phys345/lab14_pll.pdf
What this is doing is simple. It is a 70Mhz voltage controlled oscillator
who's frequency is controlled such that every 7th cycle the phase matches
your 10MHz reference. The example above does divide by 10 or
o.com
Subject: Re: [time-nuts] what is the best way to multiply a 10 Mhz signal?
Hi Rich
Thanks for the replyI have an AD9834 DDS chip I want to use for a
Frequency generator with an accuracy of 1 Hz from 0-30 Mhz. . This part can
be clocked at 75 Mhz - but unlike other DDS chips seems to
Hi Rich
Thanks for the replyI have an AD9834 DDS chip I want to use for a
Frequency generator with an accuracy of 1 Hz from 0-30 Mhz. . This part can
be clocked at 75 Mhz - but unlike other DDS chips seems to have no internal
clock multipliers. So it seems to me if I can some how generate
I used to be in the synthesizer business (Zeta Labs)
in a previous life. I learned to ask the customers:
what you are trying to accomplish as the end goal,
before tackling a messy problem like multiplying by
7. Maybe you don't need to multiply by 7, but we
can't tell from your question.
Rick Ka
On 21/12/10 16:35, Stephen Farthing wrote:
Hi everyone,
I want to multiply the output from my Efratom 101 (10Mhz) to clock a DDS at
70 Mhz. Has anyone tried this?
Regards,
Steve G0XAR
What is the application? What will the DDS output frequency be?
Maybe you could use a 70MHz (or whatever fr
I'm certainly not the expert but can't you place a divide by 7 counter
in the feedback loop of a phase lock loop. There is a fast version
of the 4046 PPL chip that does 100Mhz and a divide by 7 is easy to
rig with TTL.
On Tue, Dec 21, 2010 at 8:35 AM, Stephen Farthing wrote:
>
> I want to mu
Von: Stephen Farthing
Betreff: [time-nuts] what is the best way to multiply a 10 Mhz signal?
> I want to multiply the output from my Efratom 101 (10Mhz) to clock a DDS at
> 70 Mhz. Has anyone tried this?
I did 5 MHz * 7 = 35 which is about the same, with CMOS gates and
filtering. (
Hi everyone,
I want to multiply the output from my Efratom 101 (10Mhz) to clock a DDS at
70 Mhz. Has anyone tried this?
Regards,
Steve G0XAR
--
It is vain to do with more that which can be done with less.
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