That seems to be the simplest, yet most effective way of doing what I need.
I'll try it. Thanks for the help, 73, Dick, W1KSZ -----Original Message----- >From: [EMAIL PROTECTED] >Sent: Apr 29, 2008 6:17 PM >To: [email protected] >Subject: Re: [time-nuts] 100 MHz Source > >Hi Dick, > >I think a very inexpensive and simple way to multiply the 10MHz to 100MHz is >the following. It only uses three standard CMOS chips: > >Use a 100MHz VCXO to generate your output frequency. Digikey has one for >$28: Digikey number 744-1213-ND. This part has about -160dBc/Hz noise floor, >quite nice. > >For the simple control logic: > >Use an NXP 74LVC163 counter with preload to divide 100MHz by 5 to get 20MHz. >Use a 74LVC74 to get a 10MHz reference out of this 20MHz, with 50% duty >cycle. > >Feed this 10MHz, and your 10MHz reference signal into an Exor gate >(74LVC86). This is the phase comparator. > >Low-Pass filter the output of the Exor gate with a low pass filter that has ><1Hz bandwidth. Say 2.2K Ohms into 100uF Tantalum with 100nF cap in paralell, >into another 2.2K Ohms/100uF Tantalum low pass filter. This signal drives the > VCXO input. > >That's all folks. > >Should cost you less than $35 including shipping, and generate a very stable >100MHz signal. Jitter, very low Phase Noise, etc determined by the 100MHz >VCXO. ADEV determined almost entirely by the 10MHz reference source. > >bye, >Said > > >In a message dated 4/29/2008 14:17:50 Pacific Daylight Time, >[EMAIL PROTECTED] writes: > >Run a 100 MHz oscillator in a divide by 10 PLL (Phase Locked Loop) >configuration, compared to your 10 MHz standard? If the Motorola / >Freescale MC145170 (-2) was still in production, that might be a good >one to use. Maybe National LMK03002. > > > > > >**************Need a new ride? Check out the largest site for U.S. used car >listings at AOL Autos. >(http://autos.aol.com/used?NCID=aolcmp00300000002851) >_______________________________________________ >time-nuts mailing list -- [email protected] >To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
