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Line 47:
Line 47: − Current draw per board per power supply channel and total power per channel+ − {| class="wikitable" style="text-align: center; background: #A9A9A9"+ − ! align="center" style="background: #f2f2f2; width: 200px" |+ − ! style="background: #f2f2f2; width: 200px" | VCC (5.75V)+ − ! style="background: #f2f2f2; width: 200px" | +5V + − ! style="background: #f2f2f2; width: 200px" | Bias @ 30 V+ − |- style="color: black;"+ − | style="background: #f9f9f9; width: 200px" | 1 backplane+ − | style="background: #f9f9f9; width: 200px" | 0.01A + − | style="background: #f9f9f9; width: 200px" | <0.005 A+ − | style="background: #f9f9f9; width: 200px" | <0.005 A+ − |-+ − | style="background: #f9f9f9; width: 200px" | 1 back + 1 ctrl+ − | style="background: #f9f9f9; width: 200px" | 0.01 A + − | style="background: #f9f9f9; width: 200px" | 0.14 A + − | style="background: #f9f9f9; width: 200px" | <0.005 A − |- − | style="background: #f9f9f9; width: 200px" | 1 back + 1 ctrl + 1 preamp − | style="background: #f9f9f9; width: 200px" | 0.16 A − | style="background: #f9f9f9; width: 200px" | 0.14 A − | style="background: #f9f9f9; width: 200px" | <0.005 A − |- − | style="background: #f9f9f9; width: 200px" | 1 back + 3 ctrl + 6 preamp − | style="background: #f9f9f9; width: 200px" | 0.91 A − | style="background: #f9f9f9; width: 200px" | 0.42 A − | style="background: #f9f9f9; width: 200px" | <0.005 A − |- − | style="background: #f9f9f9; width: 200px" | 6 back + 17 ctrl + 34 preamp − | style="background: #f9f9f9; width: 200px" | 5.46 A − | style="background: #f9f9f9; width: 200px" | 2.52 A − | style="background: #f9f9f9; width: 200px" | <0.005 A − |- − | style="background: #f9f9f9; width: 200px" | - − | style="background: #f9f9f9; width: 200px" | - − | style="background: #f9f9f9; width: 200px" | - − | style="background: #f9f9f9; width: 200px" | - − |- − | style="background: #f9f9f9; width: 200px" | Total power − | style="background: #f9f9f9; width: 200px" | 31.395 W − | style="background: #f9f9f9; width: 200px" | 12.6 W − | style="background: #f9f9f9; width: 200px" | − |} − − *1mV peak-to-peak ripple should suffice for our needs. − *10mV resolution is sufficient. − *Computer connection capability would be good for remote control but not needed.
→Power Supply Requirements
=== Power Supply Requirements ===
=== Power Supply Requirements ===
We require the following voltages on the boards: ~72V for biasing, 5.75V for VCC, +5V. Therefore, a power supply with 100V, 10V, and 5V channels, or 100V, and 2x 10V channels, is required.
The programming resolution for each channel should be:
*100V: 0.001V where a typical voltage is 71.770V.
*10V: 0.01V where a typical voltage is 5.75V.
*5V/10V: 0.01 where a typical voltage is 5.00V.
The accuracy for each of these channels should be 0.02%
The power required for each of these channels is as follows:
*100V: 1W total for the 34 boards x 15 channels/board
*10V: 40W total for all of the boards
*5V/10V: 15W total for all of the boards
The ripple for 0.1Hz-10Hz can be 10mV and for 10Hz-20MHz the ripple should be around 5mV. These values are based on the gain curve below and the requirement that the time scale of the ripple be less than 50ps. Converting to voltage from picoseconds can be done using a linear approximation of the rising edge of a typical pulse (300mV peak height, ~2ns rise time). The spec for the 10Hz-20MHz range is set by the gain curve peak around 80kHz.
[[file:FinalPreampVpowerGainCurve.png]]
[[file:FinalPreampVpowerGainCurve.png]]
== Hamamatsu MPPC SiPMs ==
== Hamamatsu MPPC SiPMs ==