Richard Bates Craig Buttar Liam Cunningham Kevin McKechnie Glasgow Timon Heim Aleksandra Dimitrievska Maurice GarciaSciveres Context of work Context of work Setup TID irradiation facility ID: 795784
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Slide1
TID Irradiations
Dima Maneuski, Richard Bates, Craig Buttar, Liam Cunningham, Kevin McKechnie (Glasgow)
Timon Heim
Aleksandra
Dimitrievska
Maurice
Garcia-Sciveres
Slide2Context of work
Context of workSetup TID irradiation facilityRelevant talks: 708550, 718707, 724185Received four bare chips for TID irradiations:0x0C94 [111.80 Mrads]. Returned to LBNL. Results talk 734679.0x0761 [214.50 Mrads]. Returned to LBNL. Results talk 708557.0x0769 [305.50 Mrads]. Returned to LBNL. Results not presented (available on request).0x0759 [520.00 Mrads]. Subject of this talk.Next steps: 1x 200 Mrad, 1x 300 Mrad, 2x 400 Mrad, 1x 500
Mrad
.
Next irradiation run planned 24th September 2018.
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Dima Maneuski
Slide3Irradiation protocol
How the irradiations and measurements were doneInfrastructureBeam ~20x20 mm, uniformity on the chip < 5%, dose rate 1.3 Mrad / h (error 10%).Improved DUT irradiation box (v.2.0), better mounting, easier DUT exchange, more robust local environmentTemperature on the chuck between -5 and -15 °C depends on irradiation run. -> Chuck temperature down to -25 °CDry air supplied to the irradiation box. More uniform dry air distribution inside the boxTemperature monitoring (2x on the chuck, 1x in the box + humidity). Logged every 60 sec.Power supply to VDDA and VDDD. Voltage and current logged every 60 sec.RD53A LDO voltages logged every 60 sec.RD53A specificTube is ON during the scans.Analog scan every 180 seconds.Digital scan every 180 seconds.Ring oscillator scan every 180 seconds.
Threshold scan every ~4h
rd53a_MonitorMUX every ~4h (read snapshot of selected DACs)
rd53a_MonitorMUXAll every ~20h (reads snapshot for each DAC)
rd53a_MonitorVcal every ~ 200h (scans InjVcalHigh_Left
)Threshold scan every ~
4h
Noise
Scan every 180 secondsDefault chip parameters: this talk from config filesThis talk injections=100 for analog and digitalUsually ran scans for some time before irradiations, than during and for some time after (cold)
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In red improvements compared to previous runs
N.B. All DACs from table 28 and 29 were measured during
irrads
. Only selected are presented.
Please
enquire for
other results.
Slide4Pictures
Some pictures317 September 2018Dima Maneuski
Slide5Environmental monitoring
Monitoring the environment before/during/after TID417 September 2018Dima ManeuskiNotesDHT22 inside the coldDS1, DS2 on the cold chuck, DS1 broke on Day 2DUT temperature ~ -25°C
Dry air compressor broke, TID was interrupted for 5h
Slide6DUT
monitoring before irradsDUT monitoring (VDDD and VDDA currents)LDO modeVoltage applied 1.800 VDUT was cooling down517 September 2018Dima ManeuskiJigsaw pattern during scans
Slide7DUT monitoring before
irradsDUT monitoring (LDO outputs)LDO modeVDDD and VDDA monitored on SCCDUT was cooling down617 September 2018Dima Maneuski
Correlated with temperature
Slide8DUT monitoring during irrads
DUT monitoring (VDDD and VDDA currents)LDO modeVoltage applied 1.800 V717 September 2018Dima Maneuski
Slide9DUT monitoring during irrads
DUT metrology (LDO outputs)LDO modeVDDD and VDDA monitored on SCC817 September 2018Dima Maneuski
Slide10DUT monitoring after irrads
DUT monitoring (VDDD and VDDA currents)LDO modeVoltage applied 1.800 VT = -25 °C917 September 2018Dima Maneuski
Slide11DUT monitoring after irrads
DUT metrology (LDO outputs)LDO modeVDDD and VDDA monitored on SCCT = -25 °C1017 September 2018Dima Maneuski
Slide12Analog scan before irrads
1117 September 2018Dima ManeuskiSome observationsCooling down period
Slide13Digital scan before irrads
1217 September 2018Dima ManeuskiSome observationsCooling down periodAll pixels return 100 counts for all FEs
Slide14Analog scan during irrads
1317 September 2018Dima ManeuskiSome observationsSyncFE: almost all pixels return 100 counts.LinFE almost all pixels return 100 counts.DiffFE almost all pixels return 100 counts.
Slide15Digital scan during
irrads1417 September 2018Dima ManeuskiSome observationsAll pixels return 100 counts for all FEs.
Slide16Analog scan after irrads
1517 September 2018Dima ManeuskiSome observationsSyncFE: almost all pixels return 100 counts.LinFE almost all pixels return 100 counts.DiffFE almost all pixels return 100 counts.
T = -25 °C
Slide17Digital scan after
irrads1617 September 2018Dima ManeuskiSome observationsAll pixels return 100 counts for all FEs.T = -25 °C
Slide18Ring Oscillator scan before irrad
1717 September 2018Dima ManeuskiScan parameters global pulse duration = 6 (was 7 before) Repetitions = 10Iterations = 20
Correlated with temperature
Slide19Ring Oscillator scan during irrad
1817 September 2018Dima ManeuskiScan parameters global pulse duration = 6 (was 7 before) Repetitions = 10Iterations = 20Observation: general RO frequency goes down with TID radiation
Slide20Ring Oscillator scan after irrad
1917 September 2018Dima ManeuskiScan parameters global pulse duration = 6 (was 7 before) Repetitions = 10Iterations = 20T = -25 °C
Slide21Threshold scan notes
Analysis procedure for each FEHistograms don’t look Gaussian, no point fittingGet mean + stDev, exclude outlying pixelsPlot as function of dose“Threshold” – mean of S-curve“Noise” – sigma of S-curveRD53A not tuned. default settingsLinFE scan range was outside working conditions(to accommodate ranges Sync and Diff Fes)Excluding from presentation2017 September 2018Dima Maneuski
Slide22Threshold scan before irrad
2117 September 2018Dima Maneuski
Slide23Threshold scan [th] during
irrad2217 September 2018Dima Maneuski
Slide24Threshold scan [noise] during irrad
2317 September 2018Dima Maneuski
Slide25MUX scan before
irradMUX scans of interest2417 September 2018Dima ManeuskiIref
Correlated with temperature
Slide26MUX scan during irrad
MUX scans of interest [Iref, RadSensor]2517 September 2018Dima ManeuskiIref
Slide27MUX scan during irrad
MUX scans of interest [InjVcalHigh_Right]Fit y=ax+bExtract a, b and chi2/ndfPlot as f(dose)2617 September 2018Dima Maneuski
Slide28Conclusions
Some conclusionsImproved DUT boxIntroduced more scansAnalog, digital scans show no abnormalities after 500 MradsMUX scan [InjVcalHigh_Right] shows no correlation with doseRadSensors show effects of dose with a bump at 50-70 MradsIref show effects of dose with a min at 100 MradsLDO output is sensitive to temperature ~1% for dT=10 °CThis translates to ~2-5% sensitivity on Iref and Radsens DACs.Threshold drifted by ~12% for DiffFE and ~17% for SyncFE after 520 Mrads
ADC Bandgap
drifted by ~6% after 520
MRads.VOUT_BG drifted by ~2% after 520 MRads.
Next irradiation will be carried out with RD53A tuned every X Mrads
(every 1 for first 10, then every 10 until 100, then every 50)
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