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Design and prototyping of SiPM electronics (view source)
Revision as of 00:12, 8 November 2009
, 00:12, 8 November 2009no edit summary
** [[MATLAB amplifier in detail]] - more information regarding the implementation of the MATLAB-based simulation of the amplifier circuit.
** [[MATLAB amplifier in detail]] - more information regarding the implementation of the MATLAB-based simulation of the amplifier circuit.
A similar amplifier circuit is necessary replicated for each SiPM in the tagger microscope. However, microscope readout calls for somewhat different design requirements and operating condition constraints. The following is a brief outline the demands on the amplifier design:
A similar amplifier circuit must be replicated for each SiPM in the tagger microscope. However, microscope readout calls for somewhat different design requirements and operating condition constraints. The following is a brief outline of the demands on the amplifier design:
* adjustable gain, ranging from readout of hundreds of pixels to calibration with single-photon counting
* adjustable gain, ranging from readout of hundreds of pixels to calibration with single-photon counting
* less than 15% gain variability on transistor <math>\beta</math> (<math>h_{FE}</math>) parameter
* less than 15% gain variability on transistor <math>\beta</math> (<math>h_{FE}</math>) parameter
== Digital Control Boards ==
== Digital Control Boards ==
A control board is necessary to operate the amplifier SiPM electronics described above. The SiPM bias voltage needs to be adjusted on a sensor by sensor basis due the the wide spread of SiPM breakdown voltages, possible differing temperature conditions and to compensate for variations of optical channel efficiency. Additionally, the amplifier boards may be set into high gain (for single photon counting diagnostic mode) and regular operating regimes. Monitoring of voltage levels and temperature on board the amplifier board is another function that ought to be filled. For these purposes, the [[SiPM digital control board|Digital Control Board]] was designed.
The PCB layout of the digital control board is complete. Testing of the three identical prototype boards manufactured for beam tests are nearing completion. Below is the design tree knowledge base for the control board system.
The PCB layout of the digital control board is complete. Testing of the three identical prototype boards manufactured for beam tests are nearing completion. Below is the design tree knowledge base for the control board system.