STAR Pixel Detector Phase-1 testing

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STAR Pixel Detector Phase-1 testing. Testing interrupted. Lena Weronika Szelezniak born on May 30, 2009 at 10:04 am weighing 3.23 kg  measuring 50 cm proud parents Joanna & Michal. 2. 2. Talk Outline. Testing plan. Test structures and DAC linearity. - PowerPoint PPT Presentation

Text of STAR Pixel Detector Phase-1 testing

  • STAR Pixel DetectorPhase-1 testing

  • **Testing interrupted

    LBNL-IPHC 06/2009 - LGLena Weronika Szelezniakborn on May 30, 2009 at10:04 am weighing3.23 kgmeasuring 50 cm proud parents Joanna & Michal

    LBNL-IPHC 06/2009 - LG

  • LBNL-IPHC 06/2009 - LG*Talk OutlineTesting plan.Test structures and DAC linearity.Measuring discriminator transfer functions.Effect of bias settings on discriminator transfer functions.Analog output measurements.Analog output threshold vs. internal discriminator threshold.Observations and discussion.

    LBNL-IPHC 06/2009 - LG

  • **Testing plan

    We generated testing plans significantly in advance of receiving the sensors. The initial testing and implementation plans for testing with the new RDO hardware are linked below.

    The testing of the Phase-1 sensors is also the testing of the new RDO system which is all new hardware, firmware and software. We anticipated that we would need some time to get all of the RDO system working reliably to adequately test the Phase-1 sensors.

    We have concentrated on assembling a scripted testing system that will allow for automated testing of sensors. Our testing of Phase-1 is not yet complete, we will show the results that we have generated thus far.LBNL-IPHC 06/2009 - LGhttp://rnc.lbl.gov/hft/hardware/docs/Phase1/m22_phase1_ultimate_sensor_testing.pdfhttp://rnc.lbl.gov/hft/hardware/docs/Phase1/phase1_testing_plan_2009_01_18.doc

    LBNL-IPHC 06/2009 - LG

  • **Testing Plan Goals

    LBNL-IPHC 06/2009 - LGhttp://rnc.lbl.gov/hft/hardware/docs/Phase1/m22_phase1_ultimate_sensor_testing.pdfhttp://rnc.lbl.gov/hft/hardware/docs/Phase1/phase1_testing_plan_2009_01_18.docOur goals are:

    Validate sensor digital control / JTAG function, digital outputs. Assess the bias settings. Validate and characterize the analog pixel function. Validate and characterize the discriminator function. Make a preliminary assessment of the fabrication yield.Assess the sensor characteristics of noise, S/N, efficiency, etc.

    LBNL-IPHC 06/2009 - LG

  • **Current Testing Scope

    LBNL-IPHC 06/2009 - LGWe have mounted 5 sensors onto individual test boards and are performing initial tests.D1D2E3E4F4

  • **Test structures and DAC linearity

    Threshold as a function of DAC valueLBNL-IPHC 06/2009 - LGCrossing points:D2=>110D1=>170E4=>100F4=>140E3=>100Measured value = design value = 250 uV / DAC countLinearity is goodSome dispersion is observed in the 5 sensors ranging from 100 to 170 DAC counts.Other DACs show good agreement with design values.

    LBNL-IPHC 06/2009 - LG

  • **Discriminator Transfer Functions

    LBNL-IPHC 06/2009 - LGDigital test results from D1 sensor - internal test mode(pixels disconnected)Nominal bias settingsnormalizednormalizedAll tests at ~ 36 C

    LBNL-IPHC 06/2009 - LG

  • **Discriminator Transfer Functions

    LBNL-IPHC 06/2009 - LGNominal bias settingsDigital test results from D1 sensor - pixels connected - darknormalizednormalized

    LBNL-IPHC 06/2009 - LG

  • **Bias Settings

    LBNL-IPHC 06/2009 - LGD1 E3 F4 parameter scan test resultsComments:A summary of scans forRow 1 - ICLPDISCRow 2 IBufBiasRow 3 IPIX that is adjusted together with VREF2In all plots, the plot title shows the values used for parameter scan (_0 is just part of the name)Colors in plot are in the following order:Black, red, green, blue, yellow, purple

    LBNL-IPHC 06/2009 - LG

  • **Bias Settings

    LBNL-IPHC 06/2009 - LGD1 E3 F4ICLPDISCIBufBiasIPIX VREF2

    LBNL-IPHC 06/2009 - LG

  • **Bias Settings

    LBNL-IPHC 06/2009 - LGAnalysis of discriminator transfer functions:Calculate derivative of the transfer functionFit the resulting curve with a Gaussian functionMean FPNSigma temporal noiseOn the following slide:Left column shows distribution of means (FPN)The figure of merit is the RMS of the distribution of meansRight column shows distribution of std (temporal noise)The figure of merit is the MEAN of the distribution of sigmas

    LBNL-IPHC 06/2009 - LG

  • **Bias Settings

    LBNL-IPHC 06/2009 - LGF4(nominal: IPIX=50, IBufBias=10, ICLPDISC=100)black plots(optimized: IPIX=60, IBufBias=5, ICLPDISC = 30) red plots

    LBNL-IPHC 06/2009 - LG

  • **Analog OutputsLBNL-IPHC 06/2009 - LGAnalog test results from D1 sensor - pixels connected - darkENC = ~16 e-Noise55Fe spectrum

    LBNL-IPHC 06/2009 - LG

  • **Analog OutputsLBNL-IPHC 06/2009 - LGSensor E3 as a function of IPIX bias.Sensor F4 ENC = 14.6 IPIX = 70

    Run(sampling time)PedestalNoisePeakPeak sigmaENC27 (2,22) IPIX=303.45 (0.78 RMS)2.67324-11.313.526 (2,22) IPIX=403.26 (0.75 RMS)2.6331410.513.825 (2,22) IPIX=453.17 (0.75 RMS)2.5830710.413.824 (2,22) IPIX=503.08 (0.75 RMS)2.553029.613.823 (2,22) IPIX=553.08 (0.77 RMS)2.5229610.314.020 (2,22) IPIX=603.05 (0.78 RMS)2.4929111.014.021 (2,22) IPIX=702.86 (0.74 RMS)2.4828213.114.422 (2,22) IPIX=802.88 (0.79 RMS)2.4227514.014.4

  • **Analog output threshold vs. internal discriminator threshold(D1) Generating the discriminator transfer functions in analysis from the analog outputs.LBNL-IPHC 06/2009 - LGSensor D1 has 1 bad analog output=> 560 columns shown.Arbitrary offsetWidth of transfer function in each column => temporal noise

    LBNL-IPHC 06/2009 - LG

  • **LED testsLBNL-IPHC 06/2009 - LGSensor E34 consecutive frames with LED pulse (occurring just after frame 1 starts)

  • **Observations and DiscussionLBNL-IPHC 06/2009 - LGYield All 5 sensors tested have fully functional JTAG and digital interfaces. One sensor has a dead analog output channel. All other analog output channels are functional. This is a small sample we are loading 5 more test boards with Phase-1 sensors. We will test and report.

    Questions: External voltage reference for comparators we can not get it to work. This is under investigation with IPHC. Christine has suggested a possible fix. We will test this soon and report.Internal comparator reference (pixels not connected) why is there a larger variation in offsets than with pixels connected? When pixels are connected, are the observed magnitude of the offsets in the discriminator switching voltage what is expected?The first ~300 columns seem to have difference bias responses than the rest of the sensor, is this expected?The sensor chip used for the latch-up testing appears to have become non-responsive. We will investigate and report.

    What can be done?Analysis of design in the way voltage references are distributed, or other reason to explain the comparator switching voltage differences.1 threshold per output?Probe test pad for temperature sensor.

  • **end

    LBNL-IPHC 06/2009 - LG

    LBNL-IPHC 06/2009 - LG

  • **Test structures and DAC linearity

    LBNL-IPHC 06/2009 - LG

    LBNL-IPHC 06/2009 - LG

    Chart1

    0.1170.1110.1050.1030.102

    0.2260.2150.2090.2050.203

    0.3350.320.3140.3070.306

    0.4450.4240.420.4090.409

    0.5540.5280.5260.5110.512

    0.6610.6320.6330.6130.614

    0.7690.7360.7380.7140.717

    0.8770.840.8440.8140.819

    0.9850.9440.9490.9150.923

    1.0921.0481.0541.0151.026

    1.21.151.161.1171.129

    1.3061.2531.2661.2181.231

    1.4141.3571.3711.3191.334

    1.521.461.4771.4191.436

    1.6281.5621.5821.5191.538

    1.7341.6641.6871.621.64

    1.8411.7671.7921.7211.742

    1.9481.871.8961.8221.843

    2.0491.9711.9981.9221.945

    2.142.0672.0942.0162.041

    D2

    D1

    E4

    F4

    E3

    IKIMO DAC

    IKIMO (V)

    Sheet1

    DACIKIMO_D2IVDREF2_D2IVDREF1_D2_@_60IVDREF1_D2_@_80IVDREF1_D2_@_100

    delta IKIMOdelta VREF2delta VREF1

    D2=>110

    100.1170.1280.6420.8591.075-0.027-0.027-0.027D1=>170

    200.2260.2320.6450.8621.078-0.024-0.024-0.0240.1090.1040.003E4=>100

    300.3350.3410.6470.8641.08-0.022-0.022-0.0220.1090.1090.002F4=>140

    400.4450.4510.650.8671.083-0.019-0.019-0.0190.110.110.003E3=>100

    500.5540.5610.6530.871.086-0.016-0.016-0.0160.1090.110.003

    600.6610.6690.6550.8721.088-0.014-0.014-0.0140.1070.1080.002

    700.7690.7780.6580.8751.091-0.011-0.011-0.0110.1080.1090.003

    800.8770.8860.6610.8771.094-0.008-0.009-0.0080.1080.1080.003

    900.9850.9940.6630.881.096-0.006-0.006-0.0060.1080.1080.002

    1001.0921.1020.6660.8831.099-0.003-0.003-0.0030.1070.1080.003

    1101.21.210.6690.8861.1020000.1080.1080.003

    1201.3061.3190.6710.8881.1040.0020.0020.0020.1060.1090.002

    1301.4141.4270.6740.8911.1070.0050.0050.0050.1080.1080.003

    1401.521.5350.6770.8941.110.0080.0080.0080.1060.1080.003

    1501.6281.6420.6790.8961.1120.010.010.010.1080.1070.002

    1601.7341.7490.6820.8991.1150.0130.0130.0130.1060.1070.003

    1701.8411.8570.6850.9011.1170.0160.0150.0150.1070.1080.003

    1801.9481.9630.6870.9041.120.0180.0180.0180.1070.1060.002

    1902.0492.0630.690.9071.1230.0210.0210.0210.1010.10.003

    2002.142.1530.6930.9091.1250.0240.0230.0230.0910.090.003

    2102.2212.2320.6950.9121.1280.0260.0260.0260.0810.0790.002

    2202.292.30.6980.9151.1310.0290.0290.0290.0690.0680.003

    2302.3492.3570.70.9171.1330.0310.0310.0310.0590.0570.002

    2402.3972.4040.7030.921.1360.0340.0340.0340.0480.0470.003

    2502.4382.4450.7060.9231.1390.0370.0370.0370.0410.0410.003

    D1D1D1D1D1

    100.1110.1190.6070.8221.035-0.041-0.041-0.041

    200.2150.2210.610.8251.038-0.038-0.038-0.0380.1040.1020.003

    300.320.3270.6120.8271.04-0.036-0.036-0.0360.1050.1060.002

    400.4240.4340.6150.8291.043-0.033-0.034-0.0330.1040.1070.003

    500.5280.540.6170.8321.045-0.031-0.031-0.0310.1040.1060.002

    600.6320.6480.620.8341.048-0.028-0.029-0.0280.1040.1080.003

    700.7360.7550.6220.8371.05-0.026-0.026-0.0260.1040.1070.002

    800.840.8