First tests of CHERWELL, a Monolithic Active Pixel Sensor. A CMOS Image Sensor (CIS) using 180 nm technology James Mylroie-Smith Queen Mary, University.

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Presentation transcript:

First tests of CHERWELL, a Monolithic Active Pixel Sensor. A CMOS Image Sensor (CIS) using 180 nm technology James Mylroie-Smith Queen Mary, University of London for the Arachnid Collaboration

 CHERWELL  4T MAPS  Deep P-Well  First Results  Future Plans  Summary James Mylroie-Smith 2 Outline

Future Present Past TPAC Digital Calorimiter using INMAPS CMOS technology Linear Colider? FORTIS 4T CMOS sensor for tracking and vertexing CHERWELL SuperB? Alice? James Mylroie-Smith 3 Origins Calorimetr y Tracking ?

James Mylroie-Smith 4 CHERWELL For tracking/vertexing and calorimetetry 180nm CMOS image sensor 4 types of pixel: DECAL25 DECAL50 Reference Pixel Strixel Internal, column-parallel ADC 12um thick epitaxial layer Standard and High resistivity DECAL 25 DECAL 50 Ref Pixel STRIXEL SUM ADC 5mm

Cherwell Digital Calorimetry (DECAL) “4T” pixels with triggered global shutter and in-pixel CDS 25um pixel pitch 2x2 pixel summing at column base 50um pixel pitchVertex/Tracking Standard “4T” pixels Reference pixel array 12 bit ramp ADC implemented at column base “Strixel” array 12 bit ramp ADC embedded in pixel array James Mylroie-Smith 5 CHERWELL DECAL 25 DECAL 50 Ref Pixel STRIXEL SUM ADC 5mm

 3T CMOS  readout and charge collection node are the same  No CDS  4T CMOS  3 additional elements  Readout and charge collection at different points  Benefits  Low noise from capacitance of the floating diffusion  Low noise and in pixel CDS  High gain James Mylroie-Smith 6 4T Technology 3T 4T

James Mylroie-Smith 7 Deep P Well Implants STANDARD CMOSINMAPS PMOS Transistors require an n-well PMOS n-well competes with n-well diode reducing the charge collection To improve charge collection efficiency a deep p-well is implanted Reflects charge back into the epitaxial layer

 We have sensors using standard and high resistivity epitaxial layers  Benefits of high res:  Faster charge collection  Reduced charge spread  Increased radiation hardness James Mylroie-Smith 8 High Resistivity Typical resistivity Ωcm High resistivity 1-10kΩcm

 The sensor type:  Standard resistivity  Reference pixels(48x96)  Understand performance:  PTC  Pedestals  Noise and Gain  Pedestals and noise with temperature  55 Fe Spectrum James Mylroie-Smith 9 Initial test

Photon Transfer Curve James Mylroie-Smith 10 PTC scan controlled by computer IR LED uses programmable generator to give uniform illumination Sensor read back to computer and data complied into PTC and results plotted

James Mylroie-Smith 11 PTC Results PTC performed using IR illumination Results show good uniformity across the pixels Gain ≈ 0.17 ADC/e Noise ≈ 12e rms Linear full well ≈ 11500e Maximum full well ≈ 14700e Log(Signal) Log(Noise 2 ) Signal Noise 2

 Readout is performed on a column by column basis  Shows common noise in columns James Mylroie-Smith 12 Pedestals Pedestal Value (ADC counts)

James Mylroie-Smith 13 Noise and Gain Noise and gain are uniform across the sensor Average noise value ~12 e rms Average gain value 0.17 => 51V/e Noise from each pixel RMS Noise(e) Gain from each pixel Gain(ADCs)

Maximum Full Well Capacity James Mylroie-Smith 14 Full well(e - ) Full well capacity ~ 14,700e Consistent across the sensor Linear full well ~11,500e

 At 50C the noise becomes large.  Increase in noise at 20C James Mylroie-Smith 15 Noise vs Temperature Temperature (C) Noise (ADCs) ZOOM Temperature (C) Pedestal Noise

 Fe55 spectrum shows a sharp cut-off  Consistent with noise and gain from PTC  Good S/N up to 150 James Mylroie-Smith 16 Fe55

 Full test and comparison of on-chip ADC with on- board ADC  Characterisation of the STRIXELs  Comparison of different resistivity chips  Testbeam at CERN planned for November  Radiation damage studies  New chip design planned – discussions with CERN James Mylroie-Smith 17 Future Plans

 Cherwell chip is working well  Noise and gain as expected  Showing good uniformity in noise and gain  Obtained Fe55 spectrum  Measured noise as a function of temperature  Detailed characterisation is underway  On course for testbeam in November James Mylroie-Smith 18 Summary