Re: [time-nuts] DPLL for 10MHz
In message 063ae10c-af96-4f39-9caf-9e5ecc96b...@gmail.com, Bill Dailey writes : Does anyone have any knowledge of a simple (just soldering a few connections and maybe programming a hz/volt rate) PCB for synchronizing a precision OCXO to a GPSDO? I am trying to improve short term stability with a high stability OCXO and dont want to cut into my fury and replace the OCXO. The Vectron TRU-50 is pretty good for that. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained by incompetence. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] DPLL for 10MHz
Doc contact me off list Bert Kehren In a message dated 5/7/2012 11:40:04 A.M. Eastern Daylight Time, docdai...@gmail.com writes: Does anyone have any knowledge of a simple (just soldering a few connections and maybe programming a hz/volt rate) PCB for synchronizing a precision OCXO to a GPSDO? I am trying to improve short term stability with a high stability OCXO and dont want to cut into my fury and replace the OCXO. I cando it manually but this seems like it would be nice and desirable for many yet I can't find anything. I presume it would have to be digital because of the long time constant. Doc KX0O Sent from my iPhone ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] DPLL for 10MHz
This is something I would also like to know. I'm sure many others would be interested as well. Bert would it be possible for you to share your thoughts on the matter with the group at large? -Eric On Mon, May 7, 2012 at 8:43 AM, ewkeh...@aol.com wrote: Doc contact me off list Bert Kehren In a message dated 5/7/2012 11:40:04 A.M. Eastern Daylight Time, docdai...@gmail.com writes: Does anyone have any knowledge of a simple (just soldering a few connections and maybe programming a hz/volt rate) PCB for synchronizing a precision OCXO to a GPSDO? I am trying to improve short term stability with a high stability OCXO and dont want to cut into my fury and replace the OCXO. I cando it manually but this seems like it would be nice and desirable for many yet I can't find anything. I presume it would have to be digital because of the long time constant. Doc KX0O Sent from my iPhone ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. -- --Eric _ Eric Garner ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] DPLL for 10MHz
On Mon, 07 May 2012 15:34:21 +, Poul-Henning Kamp p...@phk.freebsd.dk wrote: In message 063ae10c-af96-4f39-9caf-9e5ecc96b...@gmail.com, Bill Dailey writes : Does anyone have any knowledge of a simple (just soldering a few connections and maybe programming a hz/volt rate) PCB for synchronizing a precision OCXO to a GPSDO? I am trying to improve short term stability with a high stability OCXO and dont want to cut into my fury and replace the OCXO. The Vectron TRU-50 is pretty good for that. That is an interesting part but what is the price and availability? It looks suspiciously like if you have to ask, then you can not afford it. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] DPLL for 10MHz
Tried, no interest, some one has offered to in the future do a gate array version, you may want to wait for that I am in the mean time using am analog loop for less than 100 seconds between Rb and OCXO and a very modified Shera for GPS/Rb. Works for me. Contact me off list and we can talk. Bert In a message dated 5/7/2012 12:05:54 P.M. Eastern Daylight Time, garn...@gmail.com writes: This is something I would also like to know. I'm sure many others would be interested as well. Bert would it be possible for you to share your thoughts on the matter with the group at large? -Eric On Mon, May 7, 2012 at 8:43 AM, ewkeh...@aol.com wrote: Doc contact me off list Bert Kehren In a message dated 5/7/2012 11:40:04 A.M. Eastern Daylight Time, docdai...@gmail.com writes: Does anyone have any knowledge of a simple (just soldering a few connections and maybe programming a hz/volt rate) PCB for synchronizing a precision OCXO to a GPSDO? I am trying to improve short term stability with a high stability OCXO and dont want to cut into my fury and replace the OCXO. I cando it manually but this seems like it would be nice and desirable for many yet I can't find anything. I presume it would have to be digital because of the long time constant. Doc KX0O Sent from my iPhone ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. -- --Eric _ Eric Garner ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] DPLL for 10MHz
Using the PPS as a sync source? On Mon, May 7, 2012 at 6:24 PM, ewkeh...@aol.com wrote: Tried, no interest, some one has offered to in the future do a gate array version, you may want to wait for that I am in the mean time using am analog loop for less than 100 seconds between Rb and OCXO and a very modified Shera for GPS/Rb. Works for me. Contact me off list and we can talk. Bert In a message dated 5/7/2012 12:05:54 P.M. Eastern Daylight Time, garn...@gmail.com writes: This is something I would also like to know. I'm sure many others would be interested as well. Bert would it be possible for you to share your thoughts on the matter with the group at large? -Eric On Mon, May 7, 2012 at 8:43 AM, ewkeh...@aol.com wrote: Doc contact me off list Bert Kehren In a message dated 5/7/2012 11:40:04 A.M. Eastern Daylight Time, docdai...@gmail.com writes: Does anyone have any knowledge of a simple (just soldering a few connections and maybe programming a hz/volt rate) PCB for synchronizing a precision OCXO to a GPSDO? I am trying to improve short term stability with a high stability OCXO and dont want to cut into my fury and replace the OCXO. I cando it manually but this seems like it would be nice and desirable for many yet I can't find anything. I presume it would have to be digital because of the long time constant. Doc KX0O Sent from my iPhone ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. -- --Eric _ Eric Garner ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] DPLL for 10MHz
The Vectron TRU-050 is a PLL with an integrated VCXO. You can sync a 10MHz OCXO but not from a GPS receiver with the PPS only. On Mon, May 7, 2012 at 6:29 PM, Azelio Boriani azelio.bori...@screen.itwrote: Using the PPS as a sync source? On Mon, May 7, 2012 at 6:24 PM, ewkeh...@aol.com wrote: Tried, no interest, some one has offered to in the future do a gate array version, you may want to wait for that I am in the mean time using am analog loop for less than 100 seconds between Rb and OCXO and a very modified Shera for GPS/Rb. Works for me. Contact me off list and we can talk. Bert In a message dated 5/7/2012 12:05:54 P.M. Eastern Daylight Time, garn...@gmail.com writes: This is something I would also like to know. I'm sure many others would be interested as well. Bert would it be possible for you to share your thoughts on the matter with the group at large? -Eric On Mon, May 7, 2012 at 8:43 AM, ewkeh...@aol.com wrote: Doc contact me off list Bert Kehren In a message dated 5/7/2012 11:40:04 A.M. Eastern Daylight Time, docdai...@gmail.com writes: Does anyone have any knowledge of a simple (just soldering a few connections and maybe programming a hz/volt rate) PCB for synchronizing a precision OCXO to a GPSDO? I am trying to improve short term stability with a high stability OCXO and dont want to cut into my fury and replace the OCXO. I cando it manually but this seems like it would be nice and desirable for many yet I can't find anything. I presume it would have to be digital because of the long time constant. Doc KX0O Sent from my iPhone ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. -- --Eric _ Eric Garner ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] DPLL for 10MHz
On Mon, 7 May 2012 10:30:56 -0500 Bill Dailey docdai...@gmail.com wrote: Does anyone have any knowledge of a simple (just soldering a few connections and maybe programming a hz/volt rate) PCB for synchronizing a precision OCXO to a GPSDO? I am trying to improve short term stability with a high stability OCXO and dont want to cut into my fury and replace the OCXO. I cando it manually but this seems like it would be nice and desirable for many yet I can't find anything. I presume it would have to be digital because of the long time constant. What speaks against a simple design as used in the GPSDO by James Miller[1]? Or if you want a better PLL than just an XOR gate, use a 74x4046. They are still available in DIL, so building a complete PLL is possible on a veroboard. This should be enough if you want to improve the short term stability below 0.1s, where the fury rises above it's long term humb. If you want to flatten down the humb the fury has (the one between a tau of 1s and x*1000s), then you need a very stable OXCO to begin with. Also, then i think the best approach would be to scale down both signals to 1kHz and use a PICTIC II to measure the phase difference between them. Then you can implement the control loop in the PIC of the PICTIC II and drive an _external_ DAC with it. Attila Kinali [1] http://www.jrmiller.demon.co.uk/projects/ministd/manual.pdf -- Why does it take years to find the answers to the questions one should have asked long ago? ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] DPLL for 10MHz
On Mon, May 7, 2012 at 9:54 AM, Attila Kinali att...@kinali.ch wrote: What speaks against a simple design as used in the GPSDO by James Miller[1]? Or if you want a better PLL than just an XOR gate, use a 74x4046. They are still available in DIL, so building a complete PLL is possible on a veroboard. This should be enough if you want to improve the short term stability below 0.1s, where the fury rises above it's long term humb. That is my solution. The 74x4046 come in a version that will do 10MHz. I use it to let a 10MHz reference that has poor short term noise drive an OCXO.It's all analog and not many parts. Chris Albertson Redondo Beach, California ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] DPLL for 10MHz
I am patiently waiting for the code to drive the DAC. Bert Kehren In a message dated 5/7/2012 12:54:54 P.M. Eastern Daylight Time, att...@kinali.ch writes: On Mon, 7 May 2012 10:30:56 -0500 Bill Dailey docdai...@gmail.com wrote: Does anyone have any knowledge of a simple (just soldering a few connections and maybe programming a hz/volt rate) PCB for synchronizing a precision OCXO to a GPSDO? I am trying to improve short term stability with a high stability OCXO and dont want to cut into my fury and replace the OCXO. I cando it manually but this seems like it would be nice and desirable for many yet I can't find anything. I presume it would have to be digital because of the long time constant. What speaks against a simple design as used in the GPSDO by James Miller[1]? Or if you want a better PLL than just an XOR gate, use a 74x4046. They are still available in DIL, so building a complete PLL is possible on a veroboard. This should be enough if you want to improve the short term stability below 0.1s, where the fury rises above it's long term humb. If you want to flatten down the humb the fury has (the one between a tau of 1s and x*1000s), then you need a very stable OXCO to begin with. Also, then i think the best approach would be to scale down both signals to 1kHz and use a PICTIC II to measure the phase difference between them. Then you can implement the control loop in the PIC of the PICTIC II and drive an _external_ DAC with it. Attila Kinali [1] http://www.jrmiller.demon.co.uk/projects/ministd/manual.pdf -- Why does it take years to find the answers to the questions one should have asked long ago? ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] DPLL for 10MHz
On Mon, 7 May 2012 12:17:02 -0500 Bill Dailey docdai...@gmail.com wrote: Regarding the vectron tru-050 looks nice but requires me to come up with a board and resistors and capacitors etc which is above my ability. Uhmm... how far does your abilities go? I looked at the miller thing but what I want to do is only correct the oscillator like every 500-1000 seconds. I want to do more than smooth out the hump. I am playing with short term stability of mid 10-13 sub 1s to 10-12 at between 500 and 1000s. Yes, it is a good oscillator but not BVA good. Read the recent Don't GPS' your Rb threat, it explains why you want to update/correct your oscillator more often than every 500 seconds. Also, if you want to go down to that level, a lot more is important than just the right GPS receiver and the right PLL. You want to think how you want to supply power to your system with very little noise on it. How you want to connect the components without picking up too much noise, neither E nor H field. etc pp. It is easiest, if you do a PCB, then you can control a lot of the stuff without too much effort. Building it on a veroboard is not recomended. Instead use a solid ground plane (ie copper plate) to mount your stuff on, if you want to do it prototype style. Atila Kinali -- Why does it take years to find the answers to the questions one should have asked long ago? ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] DPLL for 10MHz
OK, so 1 PPS GPS to Rb - need a TIC; 10MHz Rb to OCXO - need a PLL. Are you interested in an all digital 10nS single shot TIC that gives you a 2's complement number (negative at the left of the GPS PPS and positive at the right)? Here it is. This is my TIC, I use it on all my GPSDOs. LIBRARY IEEE; USE IEEE.STD_LOGIC_1164.ALL; USE IEEE.STD_LOGIC_UNSIGNED.ALL; ENTITY PPSPSI IS PORT (PPSTIEOut: OUT std_logic_vector (23 downto 0); PPSInA, PPSInB, Clock100, Clock20: IN std_logic); END ENTITY PPSPSI; ARCHITECTURE RippleCounter OF PPSPSI IS SIGNAL PPSPhaseCntAB, PPSPhaseCntBA: std_logic_vector (22 downto 0); SIGNAL PPSPhaseLtc: std_logic_vector (23 downto 0); SIGNAL PPSADlyed, PPSBDlyed: std_logic_vector (4 downto 0); SIGNAL PPSGateAB, PPSGateBA, PPSLtcA, PPSRstA, PPSLtcB, PPSRstB, StopCntAB, StopCntBA: std_logic; SIGNAL RstGateAB, RstGateBA, OvrLtcAB, OvrLtcBA, PPSLtcA1, PPSLtcB1, PPSA2BSign: std_logic; BEGIN PPSAtoBSign: PROCESS --Sign will be 1 when A leads B (that is the TIE is negative) BEGIN WAIT UNTIL PPSInB'EVENT AND PPSInB='1'; PPSA2BSign= PPSInA; END PROCESS PPSAtoBSign; PPSAtoBGate: PROCESS (PPSInA, RstGateAB) BEGIN IF RstGateAB='1' THEN PPSGateAB= '0'; ELSIF PPSInA'EVENT AND PPSInA='1' THEN PPSGateAB= '1'; END IF; END PROCESS PPSAtoBGate; PPSBtoAGate: PROCESS (PPSInB, RstGateBA) BEGIN IF RstGateBA='1' THEN PPSGateBA= '0'; ELSIF PPSInB'EVENT AND PPSInB='1' THEN PPSGateBA= '1'; END IF; END PROCESS PPSBtoAGate; PPSADelay: PROCESS BEGIN WAIT UNTIL Clock20'EVENT AND Clock20='1'; PPSADlyed= PPSADlyed (3 downto 0)PPSInA; END PROCESS PPSADelay; PPSBDelay: PROCESS BEGIN WAIT UNTIL Clock20'EVENT AND Clock20='1'; PPSBDlyed= PPSBDlyed (3 downto 0)PPSInB; END PROCESS PPSBDelay; PPSPhaseErrAB0: PROCESS (Clock100, PPSRstB) --Phase error counter bit 0 clocked by the gated 100MHz BEGIN IF PPSRstB='1' THEN PPSPhaseCntAB (0)= '1'; ELSIF Clock100'EVENT AND Clock100='1' THEN IF PPSGateAB='1' AND StopCntAB='0' THEN PPSPhaseCntAB (0)= NOT PPSPhaseCntAB (0); END IF; END IF; END PROCESS PPSPhaseErrAB0; PPSPhaseErrAB: FOR I IN 1 TO 22 GENERATE PPSPhaseErrABi: PROCESS (PPSPhaseCntAB (I-1), PPSRstB) --Phase error counter bit 1 BEGIN IF PPSRstB='1' THEN PPSPhaseCntAB (I)= '1'; ELSIF PPSPhaseCntAB (I-1)'EVENT AND PPSPhaseCntAB (I-1)='1' THEN PPSPhaseCntAB (I)= NOT PPSPhaseCntAB (I); END IF; END PROCESS PPSPhaseErrABi; END GENERATE PPSPhaseErrAB; PPSPhaseErrBA0: PROCESS (Clock100, PPSRstA) --Phase error counter bit 0 clocked by the gated 100MHz BEGIN IF PPSRstA='1' THEN PPSPhaseCntBA (0)= '0'; ELSIF Clock100'EVENT AND Clock100='1' THEN IF PPSGateBA='1' AND StopCntBA='0' THEN PPSPhaseCntBA (0)= NOT PPSPhaseCntBA (0); END IF; END IF; END PROCESS PPSPhaseErrBA0; PPSPhaseErrBA: FOR I IN 1 TO 22 GENERATE PPSPhaseErrBAi: PROCESS (PPSPhaseCntBA (I-1), PPSRstA) --Phase error down counter BEGIN IF PPSRstA='1' THEN PPSPhaseCntBA (I)= '0'; ELSIF PPSPhaseCntBA (I-1)'EVENT AND PPSPhaseCntBA (I-1)='0' THEN PPSPhaseCntBA (I)= NOT PPSPhaseCntBA (I); END IF; END PROCESS PPSPhaseErrBAi; END GENERATE PPSPhaseErrBA; StopCntAB= '1' WHEN PPSPhaseCntAB (22 downto 1)=00 ELSE '0'; StopCntBA= '1' WHEN PPSPhaseCntBA (22 downto 1)=11 ELSE '0'; PPSPhaseLtc= '0'PPSPhaseCntBA WHEN PPSLtcA='1' AND PPSA2BSign='0' AND StopCntBA='0' ELSE '1'PPSPhaseCntAB WHEN PPSLtcB='1' AND PPSA2BSign='1' AND StopCntAB='0' ELSE PPSPhaseLtc; OvrLtcAB= StopCntAB WHEN PPSLtcB1='1' ELSE OvrLtcAB; OvrLtcBA= StopCntBA WHEN PPSLtcA1='1' ELSE OvrLtcBA; RstGateAB= '1' WHEN PPSInB='1' AND PPSBDlyed (1)='0' ELSE '0'; RstGateBA= '1' WHEN PPSInA='1' AND PPSADlyed (1)='0' ELSE '0'; PPSLtcA= '1' WHEN PPSADlyed=00011 ELSE '0'; PPSLtcA1= '1' WHEN PPSADlyed=1 ELSE '0'; --To be used by the terminal count value PPSRstA= '1' WHEN PPSADlyed=0 ELSE '0'; PPSLtcB= '1' WHEN PPSBDlyed=00011 ELSE '0'; PPSLtcB1= '1' WHEN PPSBDlyed=1 ELSE '0'; --To be used by the terminal count value PPSRstB= '1' WHEN PPSBDlyed=0 ELSE '0'; PPSTIEOut= 0111 WHEN OvrLtcAB='1' AND OvrLtcBA='1' AND PPSPhaseLtc (23)='0' ELSE 1000 WHEN OvrLtcAB='1' AND OvrLtcBA='1' AND PPSPhaseLtc (23)='1' ELSE PPSPhaseLtc; END ARCHITECTURE RippleCounter; On Mon, May 7, 2012 at 7:58 PM, ewkeh...@aol.com wrote: 10 MHz between Rb and OCXO 1 pps between GPS and Rb. Always a Rb with GPS. Bert Kehren In a message dated 5/7/2012 1:30:57 P.M. Eastern Daylight Time, azelio. bori...@screen.it writes: Using the PPS as a sync source? On Mon, May 7, 2012 at 6:24 PM, ewkeh...@aol.com wrote: Tried, no interest, some one has offered to in the future do a gate array version, you may want to wait for that I am in the mean time using am analog loop for less than 100 seconds between Rb and OCXO and a very modified Shera for GPS/Rb. Works for me. Contact me off list and we can talk. Bert In a message dated 5/7/2012 12:05:54 P.M. Eastern Daylight Time, garn...@gmail.com writes: This is something I would also like
Re: [time-nuts] DPLL for 10MHz
Regarding my abilities.. regarding electronics... poor soldering is about my limit... through hole only. That is why I was hoping there was some off the shelf method that I could wire up with 10 MHz in from the gspdo and from the oscillator then wire up the EFC volatge and set the required parameters and it would adjust my oscillator to the same frequency as the GPSDO. Sounds simple enough to me. but apparently not. I guess I need to figure out how to do this electronics stuff...incidentally avoidance of 1) foreign languages, 2) drafting and 3) electronics is why I chose to become a chemical engineer.. hi hi. I once accidentally signed up for a physics lab that involved electronics... made it through the first lab period.. was like a fish out of water... walked immediately to administration and dropped it. Oscilla-what I said as I skipped out of there. It was all electrical engineers. -- Doc Bill Dailey KXØO ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] DPLL for 10MHz
I'm running (although running isn't quite correct for VHDL) this on a 50Kgates Xilinx XC3S50 FPGA. Of course this can be compiled on whatever brand of logic you prefer, I've not used any proprietary/strange (other than local clocks, which are usually discouraged) property. Of course this is only a piece of the whole thing but it is the starting point. I combine 4 of these to get a 2.5nS single shot resolution, driven by 4 phases of the 100MHz clock derived from the XC3S50 clock manager. The 144pin XC3S50 can be soldered by hand, not so easy but can be done. Better get an FPGA evaluation board. On Mon, May 7, 2012 at 11:27 PM, Thomas S. Knutsen la3...@gmail.com wrote: Hello. Thanks for publishing the VHDL code. What kind of device do you suggest for incorporating this? perhaps one that can be soldered by humans (no BGA). My only experience with FPGA is the Altera DE2 board we use at school. 73 de Thomas LA3PNA. 2012/5/7 Azelio Boriani azelio.bori...@screen.it OK, so 1 PPS GPS to Rb - need a TIC; 10MHz Rb to OCXO - need a PLL. Are you interested in an all digital 10nS single shot TIC that gives you a 2's complement number (negative at the left of the GPS PPS and positive at the right)? Here it is. This is my TIC, I use it on all my GPSDOs. LIBRARY IEEE; USE IEEE.STD_LOGIC_1164.ALL; USE IEEE.STD_LOGIC_UNSIGNED.ALL; ENTITY PPSPSI IS PORT (PPSTIEOut: OUT std_logic_vector (23 downto 0); PPSInA, PPSInB, Clock100, Clock20: IN std_logic); END ENTITY PPSPSI; ARCHITECTURE RippleCounter OF PPSPSI IS SIGNAL PPSPhaseCntAB, PPSPhaseCntBA: std_logic_vector (22 downto 0); SIGNAL PPSPhaseLtc: std_logic_vector (23 downto 0); SIGNAL PPSADlyed, PPSBDlyed: std_logic_vector (4 downto 0); SIGNAL PPSGateAB, PPSGateBA, PPSLtcA, PPSRstA, PPSLtcB, PPSRstB, StopCntAB, StopCntBA: std_logic; SIGNAL RstGateAB, RstGateBA, OvrLtcAB, OvrLtcBA, PPSLtcA1, PPSLtcB1, PPSA2BSign: std_logic; BEGIN PPSAtoBSign: PROCESS --Sign will be 1 when A leads B (that is the TIE is negative) BEGIN WAIT UNTIL PPSInB'EVENT AND PPSInB='1'; PPSA2BSign= PPSInA; END PROCESS PPSAtoBSign; PPSAtoBGate: PROCESS (PPSInA, RstGateAB) BEGIN IF RstGateAB='1' THEN PPSGateAB= '0'; ELSIF PPSInA'EVENT AND PPSInA='1' THEN PPSGateAB= '1'; END IF; END PROCESS PPSAtoBGate; PPSBtoAGate: PROCESS (PPSInB, RstGateBA) BEGIN IF RstGateBA='1' THEN PPSGateBA= '0'; ELSIF PPSInB'EVENT AND PPSInB='1' THEN PPSGateBA= '1'; END IF; END PROCESS PPSBtoAGate; PPSADelay: PROCESS BEGIN WAIT UNTIL Clock20'EVENT AND Clock20='1'; PPSADlyed= PPSADlyed (3 downto 0)PPSInA; END PROCESS PPSADelay; PPSBDelay: PROCESS BEGIN WAIT UNTIL Clock20'EVENT AND Clock20='1'; PPSBDlyed= PPSBDlyed (3 downto 0)PPSInB; END PROCESS PPSBDelay; PPSPhaseErrAB0: PROCESS (Clock100, PPSRstB) --Phase error counter bit 0 clocked by the gated 100MHz BEGIN IF PPSRstB='1' THEN PPSPhaseCntAB (0)= '1'; ELSIF Clock100'EVENT AND Clock100='1' THEN IF PPSGateAB='1' AND StopCntAB='0' THEN PPSPhaseCntAB (0)= NOT PPSPhaseCntAB (0); END IF; END IF; END PROCESS PPSPhaseErrAB0; PPSPhaseErrAB: FOR I IN 1 TO 22 GENERATE PPSPhaseErrABi: PROCESS (PPSPhaseCntAB (I-1), PPSRstB) --Phase error counter bit 1 BEGIN IF PPSRstB='1' THEN PPSPhaseCntAB (I)= '1'; ELSIF PPSPhaseCntAB (I-1)'EVENT AND PPSPhaseCntAB (I-1)='1' THEN PPSPhaseCntAB (I)= NOT PPSPhaseCntAB (I); END IF; END PROCESS PPSPhaseErrABi; END GENERATE PPSPhaseErrAB; PPSPhaseErrBA0: PROCESS (Clock100, PPSRstA) --Phase error counter bit 0 clocked by the gated 100MHz BEGIN IF PPSRstA='1' THEN PPSPhaseCntBA (0)= '0'; ELSIF Clock100'EVENT AND Clock100='1' THEN IF PPSGateBA='1' AND StopCntBA='0' THEN PPSPhaseCntBA (0)= NOT PPSPhaseCntBA (0); END IF; END IF; END PROCESS PPSPhaseErrBA0; PPSPhaseErrBA: FOR I IN 1 TO 22 GENERATE PPSPhaseErrBAi: PROCESS (PPSPhaseCntBA (I-1), PPSRstA) --Phase error down counter BEGIN IF PPSRstA='1' THEN PPSPhaseCntBA (I)= '0'; ELSIF PPSPhaseCntBA (I-1)'EVENT AND PPSPhaseCntBA (I-1)='0' THEN PPSPhaseCntBA (I)= NOT PPSPhaseCntBA (I); END IF; END PROCESS PPSPhaseErrBAi; END GENERATE PPSPhaseErrBA; StopCntAB= '1' WHEN PPSPhaseCntAB (22 downto 1)=00 ELSE '0'; StopCntBA= '1' WHEN PPSPhaseCntBA (22 downto 1)=11 ELSE '0'; PPSPhaseLtc= '0'PPSPhaseCntBA WHEN PPSLtcA='1' AND PPSA2BSign='0' AND StopCntBA='0' ELSE '1'PPSPhaseCntAB WHEN PPSLtcB='1' AND PPSA2BSign='1' AND StopCntAB='0' ELSE PPSPhaseLtc; OvrLtcAB= StopCntAB WHEN PPSLtcB1='1' ELSE OvrLtcAB; OvrLtcBA= StopCntBA WHEN PPSLtcA1='1' ELSE OvrLtcBA; RstGateAB= '1' WHEN PPSInB='1' AND PPSBDlyed (1)='0' ELSE '0'; RstGateBA= '1' WHEN PPSInA='1' AND PPSADlyed (1)='0' ELSE '0'; PPSLtcA= '1' WHEN PPSADlyed=00011 ELSE '0'; PPSLtcA1= '1' WHEN PPSADlyed=1 ELSE '0'; --To be used by the terminal count value PPSRstA= '1' WHEN PPSADlyed=0 ELSE '0'; PPSLtcB= '1' WHEN PPSBDlyed=00011 ELSE '0'; PPSLtcB1= '1' WHEN PPSBDlyed=1 ELSE '0'; --To be used by the terminal
Re: [time-nuts] DPLL for 10MHz
I do not know if this is the type of solution you were looking for but Wenzel builds a fantastic LNPLL. Thomas Knox Date: Mon, 7 May 2012 16:11:13 -0500 From: docdai...@gmail.com To: time-nuts@febo.com Subject: Re: [time-nuts] DPLL for 10MHz Regarding my abilities.. regarding electronics... poor soldering is about my limit... through hole only. That is why I was hoping there was some off the shelf method that I could wire up with 10 MHz in from the gspdo and from the oscillator then wire up the EFC volatge and set the required parameters and it would adjust my oscillator to the same frequency as the GPSDO. Sounds simple enough to me. but apparently not. I guess I need to figure out how to do this electronics stuff...incidentally avoidance of 1) foreign languages, 2) drafting and 3) electronics is why I chose to become a chemical engineer.. hi hi. I once accidentally signed up for a physics lab that involved electronics... made it through the first lab period.. was like a fish out of water... walked immediately to administration and dropped it. Oscilla-what I said as I skipped out of there. It was all electrical engineers. -- Doc Bill Dailey KXØO ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
