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OUTLINE Reminder: variants of in-pixel circuitry with discriminator developed

First Test Results of the prototype sensor AROM-1 Christine Hu-Guo (on behalf of the PICSEL & ALICE teams of IPHC-Strasbourg). OUTLINE Reminder: variants of in-pixel circuitry with discriminator developed Status of AROM-1 A,B,C lab. tests Summary and provisional conclusion.

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OUTLINE Reminder: variants of in-pixel circuitry with discriminator developed

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  1. First Test Results of the prototype sensor AROM-1Christine Hu-Guo (on behalf of the PICSEL & ALICE teams of IPHC-Strasbourg) OUTLINE Reminder: variants of in-pixel circuitry with discriminator developed Status of AROM-1 A,B,C lab. tests Summary and provisional conclusion

  2. AROM (Accelerated Readout MIMOSA Sensor) Family AROM-0 submission Feb. 2013 VERSION 1 VERSION 2 VERSION 3 • 32 x32 pixels (22x33 µm²) Single row readout • 16 x16 pixels (22x33 µm²) Double row readout • 32 x32 pixels (22x33 µm²) Single row readout • 32 x32 pixels (22x33 µm²) Single row readout AROM-1 submission Aug. 2013 • Optimising thermal noise • Minimising RTS noise by increasing input NMOS dimension • Minimising cross talk by optimising layout 64 x 64 pixels, double row readout A: 22x33 µm² (same layout as AROM-0_V2) B: 22x33 µm² (different layout) C: 24x33 µm² (study impact of pixel pitch) AROM-1 submission Jan. 2014 • Optimising power consumption • Optimising input transistor dimension • Minimising cross talk coming from Latch 64 x 64 pixels, double row readout E: 22x33 µm² F: 27x27 µm² FSBB-A0 submission Feb. 2014 • Increasing digital signal driving capability Pixel array: 416 x 416 pixels Pixel pitches: 22x33 µm² ASTRAL sensor IPHC christine.hu@in2p3.fr

  3. Status of test • Beginning of Jan. 2014: AROM-1 A, B, C back from foundry • 09/01/2014: DAQ + JTAG validation • 20/01/2014: analysis software validation Stand by due to other activities (AIDA test, ER preparation) • 18/2/2014: early characterisations • Test condition: • 15 °C • Clock frequency @ 100 MHz • 160 MHz in the design. CK @ 100 MHz is limited by present acquisition board • New acquisition board is being validated for full speed operation IPHC christine.hu@in2p3.fr

  4. Digital Output Ana. Test Discri. Test Only for 8 Analogue channels AROM-1 (A, B, C) submission Aug. 2013 • Array: 64 x 64 pixels, 56 digital output columns, 8 analogue + digital output columns • Two rows are read out simultaneously every 100 ns • 2 x 64 digital signals are multiplexed to x16 outputs at 80 MHz • 2 x 8 analogue signals have each an individual output buffer • Testability: • Analogue (diode + preamplifier) behaviours: • Digital output: • Scan discriminator alone • Scan discriminator with FE (sensing element + preamplifier) Pixel IPHC christine.hu@in2p3.fr

  5. Analogue output (1) • Tests performed with Fe55 source • Charge collected by seed pixel and by 2x2 pixels  Seed pixel collects ~30-40 % of total charge  similar to CCE of MIMOSA-22THRB IPHC christine.hu@in2p3.fr

  6. Analogue output (2) • Impact of the discriminator control signal on analogue part behaviour Conclusion: marginal impact • Analogue part of the circuitry shows satisfactory performances IPHC christine.hu@in2p3.fr

  7. Digital output: Test discriminator alone • Tests performed by scanning Test_Sig voltage • Chip A: • TN ~ 0.65 mV, FPN ~ 0.55 mV  Consistent with MIMOSA-22THRB IPHC christine.hu@in2p3.fr

  8. Digital output: Test discriminator connected to FE (1) • Chip A • TN ~ 0.61 mV, FPN ~ 0.49 mV • TN dispersion X2 IPHC christine.hu@in2p3.fr

  9. Discriminator + FE Discriminator alone Digital output: Test discriminator connected to FE (2) • Results from chip B (same as chip A but different layout): TN ~ 0.61 mV, FPN ~ 0.47 mV TN ~ 0.75 mV, FPN ~ 0.48 mV IPHC christine.hu@in2p3.fr

  10. Test of (Sensing element + Amp + Discriminator) with Fe55 • Individual tests of pixel (analogue) or discriminator (S curve) are correct • Analogue part is sensitive to Fe55 source, number of hits is as expected • Pixel + discriminator exhibit currently a too low sensitivity to the source • AROM-0 does not show such a feature • Need still some time to check reliability of measurement • Verifying control signals, bias, … • Using external reference voltage • Studying power supply dependency IPHC christine.hu@in2p3.fr

  11. Summary and Provisional Conclusion • Tests of AROM-1, which prefigurates the ASTRAL pixel (in-pixel discriminator), have started a few weeks ago • Individual studies of the analogue part of the circuitry and of the discrimination circuitry show satisfactory performances • Once both parts are interconnected, the pixel seems to lose detection efficiency, in a way which is not yet understood • More time is needed to cross-check the set-up • Forthcoming steps: clarify the behaviour of the pixel • Move to nominal frequency (160 MHz) • April : start testing AROM-1E/F ? IPHC christine.hu@in2p3.fr

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