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CAN First-TF
Communauté Autour du Numérique de First-TF
http://first-tf-can.utinam.cnrs.fr
Site web de la communauté
Community web site
can@first-tf-can.utinam.cnrs.fr
Liste de diffusion
Mailing list
Champs des activités – Activity fields
–Veille technologique : techniques en électronique « numérique » appliquées aux aspects T/F, état de l’art, réflexions communes, nouvelles approches. Technological watch: T/F digital designs, state-of-the-art, joint discussions, new solutions.
–Pédagogie : portail web CAN (bibliographie, aide et initiations), développement de maquettes, support aux formations de FIRST-TF. Training: online portal CAN (bibliography, designs guides), prototyping, materials for FIRST-TF.
–Echanges techniques : wiki, liste de diffusion, organisation d'ateliers. Experience sharing: wiki, mailing list,, workshops organisations.
– Soumissions de projets pour financement par FIRST-TF. Proposals for financial support by FIRST-TF.
–Publications techniques / Technical publications
–Favoriser les collaborations / Develop Collaborations
Wiki
Favoriser les échanges, développer des méthodes pour l'instrumentation temps-réel de haute précision.
Create exchange and develop high-precision digital methods and realtime instrumentation.
Suggestion de thèmes abordés sur le site collaboratif type wiki - Topics available on the wiki-like collaborative platform :
• Fully digital signal analysis, quantification, noise
• Servo controls
• Digital Lock-in amplifiers
• DDS & PLL
• Atoms & objects manipulations
• Time to Digital converters, Electronic counters
• Noise generators, . . .
• GPS systems
• Time in Networks (White Rabbit, ...)
• Software-defined Radio
• Open-Source instruments
Research, Amateur Radio, Education, Popularization
Contact : contact@first-tf-can.utinam.cnrs.fr
A DDS-based phase and frequency tracking system
Examples of Realizations
Cold-atoms : AOM/EOM drivers
Features of DDS CARD AD9959
SPI mode 2 wires @8MHz
4 RF outputs useful 100KHz to 190MHz
MSP430 16-bit interface@8MHz
Pc com via USB to serial converter
CVI interface
Features of DDS CARD AD9852-58
Parallel mode 8 bits @10MHz
1 RF output useful 100KHz to 130MHz
100KHz to 400MHz for AD9858
OSK and FSK capabilities
Pc com DIO 32 National Instruments
LABVIEW interface
Features of DDS CARD ON RACK
SPI mode 3 wires @10MHz
5 RF outputs useful 100KHz to 130MHz
TM4C Séries 32-bit interface@80MHz
Pc com via USB to serial converter
CVI interface or touchscreen
DUT & DDS are maintained in quadrature
The controller tracks the phase and frequency
A low-cost experiment (Redpitaya or Zedboard with LTC2158, AD9915 eval board) provides easily 3 ms phase tracking and 0.7 s frequency rates
Prefiltering stages within FPGA (e.g. Box car with 218 averages lead to a time constant of 2 ms)
Servo implemented either realtime or userspace depending on chosen sensitivity (allows for saving ressources).
Red : spare free-running quartz oscillator (meas : HP53132A)
Green : stability measurement at DDS output
Blue : frequency correction calculation
For the sake reconfigurability and ease development, we present here simple tests on medium quality quartz oscillator while data analysis is performed through the embeded CPU unit. Concurrent RAM transfert and calculations denefits from multithreaded techniques