1 / 27

A portable readout system for microstrip silicon sensors (ALIBAVA)

A portable readout system for microstrip silicon sensors (ALIBAVA). 3th Workshop on Advanced Silicon Radiation Detectors, 14-16 April, Barcelona, Spain. Ricardo Marco-Hernández. IFIC(CSIC-Universidad de Valencia) 1.

nona
Download Presentation

A portable readout system for microstrip silicon sensors (ALIBAVA)

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. A portable readout system for microstrip silicon sensors (ALIBAVA) 3th Workshop on Advanced Silicon Radiation Detectors, 14-16 April, Barcelona, Spain Ricardo Marco-Hernández IFIC(CSIC-Universidad de Valencia) 1 A portable readout system for microstrip silicon sensors (ALIBAVA) Bernabeu, J.a, Casse, G.b, García, C.a, Greenall, A.b, Lacasta, C.a, Lozano, M.c, Marco-Hernández, R.a, Martí i García, S.a, Martinez, R.bMiñano, M.a, Pellegrini, G.c, Smith, N. A.b, Ullán, M.c a Instituto de Física Corpuscular (IFIC), Universidad de Valencia-CSIC,Valencia, Spain. b Department of Physics, Oliver Lodge Laboratory, University of Liverpool, Liverpool, UK. c Instituto de Microelectrónica de Barcelona, IMB-CNM, CSIC, Barcelona, Spain

  2. A portable readout system for microstrip silicon sensors (ALIBAVA) 3th Workshop on Advanced Silicon Radiation Detectors, 14-16 April, Barcelona, Spain Ricardo Marco-Hernández IFIC(CSIC-Universidad de Valencia) 2 Outline • Motivations. • System requirements. • System architecture. • Daughter board: • Block diagram. • Beetle chip. • Fan-ins. • Mother board: • Block diagram. • FPGA logic. • System operation. • PC software characteristics. • Calibration measurements. • Measurements with laser setup. • Measurements with β source. • Conclusions and outlook.

  3. A portable readout system for microstrip silicon sensors (ALIBAVA) 3th Workshop on Advanced Silicon Radiation Detectors, 14-16 April, Barcelona, Spain Ricardo Marco-Hernández IFIC(CSIC-Universidad de Valencia) 3 Motivations • Study the main properties of highly irradiated microstrip silicon sensors: SLHC. • Particularly the collected charge: detector performance. • Difficulty for obtaining this type of measurements: • Required equipment is expensive. • A large number of channels has to be measured. • There is minimum standardization. • Testing with an electronic system as similar as possible to those used at LHC experiments: a LHC front end readout chip should be used. • Analogue readout is preferred for accurate pulse shape reconstruction.

  4. A portable readout system for microstrip silicon sensors (ALIBAVA) 3th Workshop on Advanced Silicon Radiation Detectors, 14-16 April, Barcelona, Spain Ricardo Marco-Hernández IFIC(CSIC-Universidad de Valencia) 4 System requirements • A compact and portable system. • The system will be used with two different laboratory setups: • Radioactive source: external trigger input from one or two photomultipliers. Alternatively a digital trigger input as well (from an external discriminator). • Laser system: synchronized trigger output generated internally for pulsing an external excitation source. • The system should contain two front-end readout chips (Beetle chip used in LHCb) to acquire the detector signals. • USB communication with a PC which will store and will process the data acquired. • System control from a PC software application in communication with a FPGA which will interpret and will execute the orders. • Own supply system from AC mains.

  5. A portable readout system for microstrip silicon sensors (ALIBAVA) 3th Workshop on Advanced Silicon Radiation Detectors, 14-16 April, Barcelona, Spain Ricardo Marco-Hernández IFIC(CSIC-Universidad de Valencia) 5 System requirements • A compact and portable system. • The system will be used with two different laboratory setups: • Radioactive source: external trigger input from one or two photomultipliers • Laser system: synchronized trigger output generated internally for pulsing an external excitation source. • The system should contain two front-end readout chips (Beetle chip used in LHCb) to acquire the detector signals. • USB communication with a PC which will store and will process the data acquired. • System control from a PC software application in communication with a FPGA which will interpret and will execute the orders. • Own supply system from AC mains. The main goal is reconstructing the analogue pulse shape from the readout chip front-end with the highest fidelity from the acquired data.

  6. A readout system for microstrip silicon sensors (ALIBAVA) 3th Workshop on Advanced Silicon Radiation Detectors, 14-16 April, Barcelona, Spain Ricardo Marco-Hernández IFIC(CSIC-Universidad de Valencia) 6 System architecture • Two main parts: software part (PC) and hardware part. • Hardware part: a dual board based system. • Mother board intended: • To process the analogue data that comes from the readout chips. • To process the trigger input signal in case of radioactive source setup or to generate a trigger signal if a laser setup is used. • To control the hardware part. • To communicate with a PC via USB. • Daughter board : • It will be a small board. • It will contain two Beetle readout chips • It will have fan-ins and detector support to interface the sensors. • Software part: • It will control the whole system (configuration, calibration and acquisition). • It will generate an output file for further data processing.

  7. A readout system for microstrip silicon sensors (ALIBAVA) 3th Workshop on Advanced Silicon Radiation Detectors, 14-16 April, Barcelona, Spain Ricardo Marco-Hernández IFIC(CSIC-Universidad de Valencia) 7 Daughter board: block diagram • Two Beetle readout chips in parallel mode (256 input channels). • A buffer stage for each analogue output of the Beetle chips: • Differential current to differential voltage buffer (AD8132) implemented. • Buffered signals are sent to the mother board with impedance matched. • Fast control (LVDS signals) and slow control (I2C bus) shared by Beetle chips. • A thermistor (NTC) for sensing the temperature close to the Beetle chips. • Low voltage DC level (5 V) for Beetle chips (2.5 V) and buffer stage power supply (3 V). • High voltage DC level for silicon detector(s) bias through a power lemo connector. • Fan-ins and detector board.

  8. A readout system for microstrip silicon sensors (ALIBAVA) 3th Workshop on Advanced Silicon Radiation Detectors, 14-16 April, Barcelona, Spain Ricardo Marco-Hernández IFIC(CSIC-Universidad de Valencia) 8 Daughter board: Beetle chip • Readout chip developed at ASIC laboratory of the University of Heildelberg. • Front-end output signal: signal that will be reconstructed from analogue readout onto one port. • This signal is sampled into the analogue pipeline (128x187 cells) with the frequency of the Beetle chip clock (40 MHz). • Vp = kQ. Tp ~ 25 ns. Total pulse length about 65-70 ns. • The analogue pipeline programmable latency fixed to 128 CLK cycles (3.2 µs). • The TRIGGER signal will have to be active 128 CLK cycles (3.2 µs) after a particular front-end signal point of interest has been sampled.

  9. A readout system for microstrip silicon sensors (ALIBAVA) 3th Workshop on Advanced Silicon Radiation Detectors, 14-16 April, Barcelona, Spain Ricardo Marco-Hernández IFIC(CSIC-Universidad de Valencia) 9 Daughter board: Beetle chip output format • Analogue output format: single readout onto one output port. • Readout: 16 bits header + 128 analogue multiplexed channels. • Channel width of 25 ns (40 MHz clock). • DataValid signal for readout detection. • Output dynamic range: linear up to ~ ±110000 e-.

  10. A readout system for microstrip silicon sensors (ALIBAVA) 3th Workshop on Advanced Silicon Radiation Detectors, 14-16 April, Barcelona, Spain Ricardo Marco-Hernández IFIC(CSIC-Universidad de Valencia) 10 Daughter board: detector support • Fan-ins: • Three fan-ins: chip fan-in, intermediate fan-in and detector fan-in. • Each fan-in has pads of 80 um pitch not staggered and 10 rows for multiple wire bonding. • Text-box: • Daughter board and detector boards are fixed to base plate for facilitating wire-bonding. • Two flavours of detector board exist: • Small, for 1cm2 sensors (board dimensions ~37mm x 32mm). • Large, for 1cm x 3cm sensors (board dimensions ~37mm x 50mm).

  11. A readout system for microstrip silicon sensors (ALIBAVA) 3th Workshop on Advanced Silicon Radiation Detectors, 14-16 April, Barcelona, Spain Ricardo Marco-Hernández IFIC(CSIC-Universidad de Valencia) 11 Mother board: block diagram • Signal conditioning block transforms the differential voltage analogue input signal from each Beetle to: • Drive an oscilloscope: single ended signal. • Drive ADC: differential input shifted signal. • ADC (one for each Beetle): • 10 bit flash type with a sample rate of 40 MHz (MAX1448). • Nominal resolution of 1 mV (output signed code, 9 bits plus 1 sign bit). • Dynamic range will be ±512 mV.

  12. A readout system for microstrip silicon sensors (ALIBAVA) 3th Workshop on Advanced Silicon Radiation Detectors, 14-16 April, Barcelona, Spain Ricardo Marco-Hernández IFIC(CSIC-Universidad de Valencia) 12 Mother board: block diagram • In case of radioactive source setup for obtaining a time stamp of each trigger. • Trigger conditioning: • Leading-edge discrimination for two photomultiplier analogue input signals. • Level conversion for an auxiliary signal (current or voltage). • Two dual LVPECL high speed comparators (MAX9601). • Four programmable voltage thresholds: generated with a quad 12 bits DAC (DAC7614). • TDC: measurement of t between input trigger and a periodic reference signal (100 ns). • A TDC integrated circuit (TDC-GP1). • Nominal resolution: 600 ps. • 100 ns dynamic range.

  13. A readout system for microstrip silicon sensors (ALIBAVA) 3th Workshop on Advanced Silicon Radiation Detectors, 14-16 April, Barcelona, Spain Programmable delay Ricardo Marco-Hernández IFIC(CSIC-Universidad de Valencia) 13 Mother board: block diagram • In case of laser setup. • A synchronised output trigger signal (TRIG OUT) will be generated to drive a laser source to reconstruct the Beetle front-end pulse shape. • Programmable delay circuit (3D7428): • Resolution: 1 ns. • Range: up to 255 ns. • Programmed by FPGA by serial interface. • Following this block a 50 Ω driver will be incorporated for driving a pulse generator input.

  14. A readout system for microstrip silicon sensors (ALIBAVA) 3th Workshop on Advanced Silicon Radiation Detectors, 14-16 April, Barcelona, Spain Ricardo Marco-Hernández IFIC(CSIC-Universidad de Valencia) 14 Mother board: block diagram • SDRAM (256 Mb): for acquisition data storage. • TEMPERATURE CONVERTER: NTC thermistor signal digitalization. • SLOW CONTROL: generated directly by the FPGA. External pull-up resistors for SDA and SCL lines. • FAST CONTROL: • LVDS driver (DS90LV47A) and LVDS receiver (DS90LV48A). • Six CM noise suppressor chokes (23Z105SM). • USB: USB controller (FT245R) for USB to FIFO parallel (8 bits) bidirectional data transfer. • SUPPLY SYSTEM: • DC input (5V) from AC adapter. • Digital levels from 2 DC-DC converter (1.2 V and 3.3 V) + 1 linear regulator (2.5 V). • Analogue levels from DC-DC converter (±5V) + 1 linear regulator (3.3V). • Daughter board level from DC-DC converter (5V).

  15. A readout system for microstrip silicon sensors (ALIBAVA) 3th Workshop on Advanced Silicon Radiation Detectors, 14-16 April, Barcelona, Spain Ricardo Marco-Hernández IFIC(CSIC-Universidad de Valencia) 15 Mother board: FPGA logic • FPGA hardware: • Xilinx Spartan-3 (XS3400-PQ208) clocked at 40 MHz. • External reset push button. • On-system configuration PROM memory. • Two LEDs for system status. • FPGA logic operation: • Custom logic blocks (VHDL) for low level hardware control. • Centralized control from a CFSM. • FPGA logic blocks: • A CFSM (Central Finite State Machine) will control the different blocks depending on the current state of the system. • Radioactive source: the DAC CONTROL, TRIGGER IN and TDC CONTROL will be used for processing the trigger inputs and obtaining a time stamp of each trigger. • Laser setup: the TRIGGER OUT block will generate the output trigger signal and will control the programmable delay circuit.

  16. A readout system for microstrip silicon sensors (ALIBAVA) 3th Workshop on Advanced Silicon Radiation Detectors, 14-16 April, Barcelona, Spain Ricardo Marco-Hernández IFIC(CSIC-Universidad de Valencia) 16 Mother board: FPGA logic • FPGA logic blocks: • ADC CONTROL: readout of the digitized data frames when the input DataValid (fast control) signal will be active. This digitized data will be stored in a internal FIFO RAM. • BEETLE FAST CONTROL: generation of fast control signals (Clk, Trigger, Testpulse and Reset) depending on the state of the system. • BEETLE SLOW CONTROL: I2C master controller for writing/reading the Beetle internal registers (slow control) for configuration. • SDRAM CONTROL: implements a controller for interfacing the SDRAM and the CFSM. • USB CONTROL: interface between the USB controller and the CFSM. • CLOCK GENERATOR: required internal clock and reset signals generation.

  17. A readout system for microstrip silicon sensors (ALIBAVA) 3th Workshop on Advanced Silicon Radiation Detectors, 14-16 April, Barcelona, Spain Ricardo Marco-Hernández IFIC(CSIC-Universidad de Valencia) 17 Mother board: FPGA logic • FPGA logic: • The CFSM and SDRAM CONTROL have been implemented with an embedded system (soft processor + SDRAM peripheral). • Soft processor: Microblaze (32 bits RISC) at 40 MHz. • SDRAM controller included as standard peripheral for the Microblaze. • ARBITRER : custom block of registers for communication between the embedded processor and the custom logic blocks. • FSLs (Fast Simplex Links): unidirectional FIFOs for fast communication between the ARBITRER and the Microblaze. • The functionality of the system is programmed as a standard C program in the processor (firmware): great flexibility for changes.

  18. A readout system for microstrip silicon sensors (ALIBAVA) 3th Workshop on Advanced Silicon Radiation Detectors, 14-16 April, Barcelona, Spain Ricardo Marco-Hernández IFIC(CSIC-Universidad de Valencia) 18 Mother board: system operation • RESET: • System initialization. • With a power on, with an external reset or by software reset. • WAITING: • The system will wait for an order coming from the PC software to go to another state. • BEETLE CONFIGURATION: • Beetle chips configuration registers programming. • CALIBRATION: • System calibration by the Beetle internal test pulse generator. • Known amplitude readouts will be acquired. • TRIGGER IN CONFIGURATION: • DAC voltage thresholds will be programmed. • Trigger inputs scheme will be configured. • LASER SYHRONIZATION: • The system will be synchronized for the Beetle front end pulse reconstruction. • By delaying the TRIG OUT signal in 1 ns steps.

  19. A readout system for microstrip silicon sensors (ALIBAVA) 3th Workshop on Advanced Silicon Radiation Detectors, 14-16 April, Barcelona, Spain Ricardo Marco-Hernández IFIC(CSIC-Universidad de Valencia) 19 Mother board: system operation • PEDESTALS, RS or LASER ACQUISITION: • A programmable number of readouts will be able to be acquired (up to 64776) and stored in the SDRAM. • PEDESTALS: For each event a Beetle chips readout (256 by 16 bits) and a temperature readout will be stored in the SDRAM. No charge acquired with Beetle chips. • RS: For each event a Beetle chips readout (256 by 16 bits), a TDC readout (32 bits) and a temperature readout will be stored in the SDRAM. • LASER: For each event a Beetle chips readout (256 by 16 bits) and a temperature readout (16 bits) will be stored in the SDRAM. The TRIG OUT frequency will be 1 KHz. • PEDESTALS, RS or LASER READING: • The last type of acquisition will be read from SDRAM and data will be sent to PC by USB.

  20. A readout system for microstrip silicon sensors (ALIBAVA) 3th Workshop on Advanced Silicon Radiation Detectors, 14-16 April, Barcelona, Spain Ricardo Marco-Hernández IFIC(CSIC-Universidad de Valencia) 20 PC software • Functions: • Control the whole system (configuration, calibration and acquisition). • User interface with the system (GUI). • Generation of information (output files). • Two software levels: • Low level for software/mother board communication by USB: VCP (virtual com port) driver (2.4 Mb/s) used. • High level: GUI and output file generation for further processing. • Programming language: C++ • Operating system compatibility: • Linux version fully operational. • Windows beta version. • There are also macros for ROOT in order to process the data acquired with the software.

  21. A readout system for microstrip silicon sensors (ALIBAVA) 3th Workshop on Advanced Silicon Radiation Detectors, 14-16 April, Barcelona, Spain Ricardo Marco-Hernández IFIC(CSIC-Universidad de Valencia) 21 Calibration measurements: n-type detector • Data acquired from calibration acquisition. • Beetle chip 1 (channels 1-128) without detector. • Non-irradiated n-type detector connected to Beetle chip 2 (channels 129-256). • First 14 and last 14 channels of Beetle 2 without detector: detector of 100 channels. • Some channels does not operate due ‘shorts’ at the bonds: reduced gain. • This data is used to calculate the ADC/electrons rate for each channel.

  22. A readout system for microstrip silicon sensors (ALIBAVA) 3th Workshop on Advanced Silicon Radiation Detectors, 14-16 April, Barcelona, Spain Ricardo Marco-Hernández IFIC(CSIC-Universidad de Valencia) 22 Calibration measurements: p-type detector • Data acquired from calibration acquisition. • Beetle chip 1 (channels 1-128) without detector. • Non-irradiated p-type detector connected to Beetle chip 2 (channels 129-256). • This data is used to calculate the ADC/electrons rate for each channel.

  23. A readout system for microstrip silicon sensors (ALIBAVA) 3th Workshop on Advanced Silicon Radiation Detectors, 14-16 April, Barcelona, Spain Ricardo Marco-Hernández IFIC(CSIC-Universidad de Valencia) 23 Measurements with laser setup: n-type detector • Data acquired by means of a laser scan. • Non-irradiated n-type detector connected to Beetle chip 2 (same conditions as on calibration). • Vbias = 200 V (full depletion). • Laser light: • Wavelength: 1060 nm (near infrared). • Laser energy of photons: 1.17 eV. • Laser scan: • Scan delay range: 1040-1140 ns. • Delay step: 1 ns. • 100 samples per step. • Some channels does not work due to bad bonds.

  24. A readout system for microstrip silicon sensors (ALIBAVA) 3th Workshop on Advanced Silicon Radiation Detectors, 14-16 April, Barcelona, Spain Ricardo Marco-Hernández IFIC(CSIC-Universidad de Valencia) 24 Measurements with laser setup: p-type detector • Data acquired by means of a laser scan. • Non-irradiated p-type detector connected to Beetle chip 2 (same conditions as on calibration). • Vbias = -100 V (full depletion). • Laser light: • Wavelength: 1060 nm (near infrared). • Laser energy of photons: 1.17 eV. • Laser scan: • Scan delay range: 1040-1160 ns. • Delay step: 1 ns. • 100 samples per step. • All channels work correctly.

  25. A readout system for microstrip silicon sensors (ALIBAVA) 3th Workshop on Advanced Silicon Radiation Detectors, 14-16 April, Barcelona, Spain Ricardo Marco-Hernández IFIC(CSIC-Universidad de Valencia) 25 Measurements with β source: n-type detector • Acquisition with β source (90Sr). • Non-irradiated n-type detector connected to Beetle chip 2 (same conditions as calibration). • Vbias = 200 V (full depletion). • Acquisition of ~ 19000 events (triggers): • Trigger input from one photomultiplier. • Threshold: -40 mV. • Some channels are noisy due to bad bonds. • Pulse peak charge corresponding ~ 1 mip (24810 e-). • Noise: ~ 1200 e-. • Common mode variations (σ= 5.88 counts) corrected by software. • SNR for peak voltage: ~ 21.

  26. A readout system for microstrip silicon sensors (ALIBAVA) 3th Workshop on Advanced Silicon Radiation Detectors, 14-16 April, Barcelona, Spain Ricardo Marco-Hernández IFIC(CSIC-Universidad de Valencia) 26 Measurements with β source: p-type detector • Acquisition with β source (90Sr). • Non-irradiated p-type detector connected to Beetle chip 2 (same conditions as calibration). • Vbias = -100 V (full depletion). • Acquisition of 20000 events (triggers): • Trigger input from one photomultiplier. • Threshold: -40 mV. • All channels working. • Pulse peak charge corresponding ~ 1 mip (26940 e-). • Noise: ~ 1200 e-. • Common mode variations (σ= 8.9 counts) corrected by software. • SNR for peak voltage: ~ 22.

  27. A readout system for microstrip silicon sensors (ALIBAVA) 3th Workshop on Advanced Silicon Radiation Detectors, 14-16 April, Barcelona, Spain Ricardo Marco-Hernández IFIC(CSIC-Universidad de Valencia) 27 Conclusions and outlook • The readout system has been developed and is fully operational. • The system can operate with different types and different sizes of microstrip detectors: • n-type. • p-type. • Up to 256 input channels. • Two flavours of detector boards to accommodate detectors of different sizes. • The system is designed to work with a radioactive source setup and laser setup: useful for comparing results with the same detector. • The system has been tested with laser setup and a β source: • It works correctly. • With p-type and n-type detectors. • SNR ~ 20 with non-irradiated detectors: there is room for irradiated detectors. • Currently, there is a software Linux version: in the near future, there will be a Windows version for the software (currently debugging a beta version). • Data acquired with the system can be easily processed using ROOT framework: some macros already developed. • System is ready for production and distribution (motherboards and daughterboards in stock). Production and assembly under demand. • Future work: upgrade of the system for testbeam acquisition by synchronizing various ALIBAVAs.

More Related