Minutes20161014

present: @gkasprow, @sbourdeauducq, @dhslichter, @jordens, @jmizrahi, @jbqubit

minutes: @jbqubit

JESD204B waveform demo update provided by @jordens https://github.com/m-labs/artiq/issues/580

NIST Servo Box and ARTIQ update by @dhslichter

relates to this https://github.com/nist-ionstorage/digital-servo
no current plans for SPI control of the lock box
Ion Storage has a rudimentary NDSP but not ready for export back to ARTIQ
does m-labs have a tracking system for keeping tabs on external groups that might have contributions to make back to ARTIQ? @jordens

Sayma LO mezzanine Idea proposed by @hartytp on 10/14 https://github.com/m-labs/sayma/issues/8

Sayma clock mezzanine signal/power @hartytp https://github.com/m-labs/sayma/issues/23

100 MHz distribution discussion

power discussion led by @gkasprow

Sayma FPGA power needs to be generated somewhere, added to #22
@jordens points out that AD9154 needs DVDD12, CVDD12, PVDD12 = 1.3 V ± 2% to max out the spec; note this variation from usual 1.2V spec
make new Issue consolidating power requirements for various ICs
- voltage, current, low noise or not
- is this a job for [email protected]?
- full planning of power will happen during simulation stage
do we want hot-swap capability?
- AMC handle contains micro-switch that works with MMC to kill power to board
- decision: we want safe hot-swapping for both Sayma AMC and Sayma RTM
- MMC will control two LEDs on AMC front panel

WUT and m-labs coordination on PCB testing

make Issue on this
WUT will
- choose development board
- learn to port ARTIQ to it
WUT needs
- example of how to use ARTIQ for I2C
- example of how to use ARTIQ for SPI
FPGA lead at WUT is Wojciech Zabolotny, [email protected], wzab
- schedule discussion with WUT

sensor readout

reminder of past discussion: MMC is domain of WUT; MMC will be used to make crude temperature measurements of boards (I2C LM75); servo crate fans; protect against overheat
how are sensors readout by FPGA?
- I2C multiplexor permits either AMC FPGA or MMC to do readout
- MMC will write sensor values into AMC FPGA memory using SPI
create Issue discussing how ARTIQ will make use of sensors on PCB
- which sensors need to be readout -- eg chip die temperature
- readout frequency
- where should the data go

analog mezzanine boards

agreed to add 2 SMP for 100 MHz clock for generation of LO on analog-mezzanine
noise specification for power to mezzanine boards discussed
- @dhslichter did a study considering ADL5375 modulator and ERA-4XSM+ amplifier as sample parts, aimed for 1e-4 stability
- initial conclusion: "10 mVpp DC 20 Hz to 20 MHz suffices", Greg says this is easy using switching supplies with no LDO
- this conclusion is predicated upon use of ADM7150 or ADM7154 LDOs on the analog mezzanine; they give 40 dB isolation at 10 MHz (better at lower frequencies)
- to be determined if LDO is needed after switching supply on the Sayma RTM motherboard or not; will be determined during power analysis; ACTION add a new Issue for power study tasks

CERN review

once the design layout is finished and inspected by physicists will be sent to CERN for review by Javier Serrano and others
CERN is likely interested only in AMC

timeline

TODO

Provide feedback