Termination of AC coupled 100MHz clok to generate low jitter 50MHz clock?
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From: Jim Thompson on 27 Jan 2010 17:31 On Wed, 27 Jan 2010 15:13:11 -0700, Jim Thompson <To-Email-Use-The-Envelope-Icon(a)My-Web-Site.com> wrote: >On Wed, 27 Jan 2010 22:58:39 +0100, Joop <jojo(a)xs4all.nl> wrote: > >>On Mon, 25 Jan 2010 15:11:17 -0800, Joerg <invalid(a)invalid.invalid> >>wrote: >> >>>Or use the voodoo method, build an oscillator and do injection locking. >>>That's almost guaranteed to produce some jaw dropping in the design >>>review :-) >> >>At the time I was not aware of the term or concept "injection >>locking", but for personal use I created a PIF12Fxx base serial output >>frequency logger. Besides running on its own usual setup crystal I >>wanted to try and see if this minimalist design could be made to work >>on my 10MHz reference as well. The simplest thing I could thing of was >>feeding it 10MHz directly to the crystal oscillator input via a few >>KOhm plus a cap. It was fun to see it move the required tens of Hz >>when the reference was connected. >>No switches required. It runs free when standalone and locked when the >>BNC is plugged in. Cool.. >> >>Joop > >My favorite trick is to make a low frequency "oscillator" by using a >shift register (looped on itself) driven by a crystal oscillator, then >"injection lock" by resetting the shift register appropriately by >comparing lead-lag between signal and shift register state (digital >phase detector). > > ...Jim Thompson As in... http://analog-innovations.com/SED/SyncRingOsc.pdf ...Jim Thompson -- | James E.Thompson, CTO | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona 85048 Skype: Contacts Only | | | Voice:(480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at http://www.analog-innovations.com | 1962 | I love to cook with wine. Sometimes I even put it in the food.
From: Jim Thompson on 29 Jan 2010 14:45
On Wed, 27 Jan 2010 15:31:55 -0700, Jim Thompson <To-Email-Use-The-Envelope-Icon(a)My-Web-Site.com> wrote: >On Wed, 27 Jan 2010 15:13:11 -0700, Jim Thompson ><To-Email-Use-The-Envelope-Icon(a)My-Web-Site.com> wrote: > >>On Wed, 27 Jan 2010 22:58:39 +0100, Joop <jojo(a)xs4all.nl> wrote: >> >>>On Mon, 25 Jan 2010 15:11:17 -0800, Joerg <invalid(a)invalid.invalid> >>>wrote: >>> >>>>Or use the voodoo method, build an oscillator and do injection locking. >>>>That's almost guaranteed to produce some jaw dropping in the design >>>>review :-) >>> >>>At the time I was not aware of the term or concept "injection >>>locking", but for personal use I created a PIF12Fxx base serial output >>>frequency logger. Besides running on its own usual setup crystal I >>>wanted to try and see if this minimalist design could be made to work >>>on my 10MHz reference as well. The simplest thing I could thing of was >>>feeding it 10MHz directly to the crystal oscillator input via a few >>>KOhm plus a cap. It was fun to see it move the required tens of Hz >>>when the reference was connected. >>>No switches required. It runs free when standalone and locked when the >>>BNC is plugged in. Cool.. >>> >>>Joop >> >>My favorite trick is to make a low frequency "oscillator" by using a >>shift register (looped on itself) driven by a crystal oscillator, then >>"injection lock" by resetting the shift register appropriately by >>comparing lead-lag between signal and shift register state (digital >>phase detector). >> >> ...Jim Thompson > >As in... > > http://analog-innovations.com/SED/SyncRingOsc.pdf > And another way... http://analog-innovations.com/SED/JammableVCO.pdf in actual use decoding Manchester. Delay blocks are those (now ancient) lumped line delay blocks with TTL-in/TTL-out. ...Jim Thompson -- | James E.Thompson, CTO | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona 85048 Skype: Contacts Only | | | Voice:(480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at http://www.analog-innovations.com | 1962 | I love to cook with wine. Sometimes I even put it in the food. |