User Guide
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Vertilon Corporation, 66 Tadmuck Road, Westford, MA 01886
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Tel: (978) 692-7070
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Fax: (978) 692-7010
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www.vertilon.com
Detector Common Anode Bias
The SIB2316 is specifically designed to operate with SensL SPMArray2s having a common anode for detector bias.
These devices have 16 separate cathode outputs that are compatible with the PhotoniQ charge sensitive preamplifier
inputs. Since the SIB2316 biases the detector cathodes at ground voltage, a negative voltage is required on the detector
common anode so that an overall reverse bias is applied to the individual SiPM devices in the SPMArray2. It is therefore
extremely important that only SensL common anode SPMArray2s are used with the SIB2316. Common cathode or other
configurations will not operate with the SIB2316 and may cause permanent damage to it or the device itself.
The figure below illustrates how the detector bias is applied to a common anode SPMArray2 by the SIB2316. Since the
SIB2316 supports up to two SPMArray2s, the board contains two instances of the circuitry shown in the figure. An FPC
cable for each SPMArray2 carries the 16 cathode signals and common anode signal to the SIB2316. A negative high
voltage bias generator on the SIB2316 provides an adjustable bias (VBIAS) to each array. The monitor points P3 and P4
should be used when adjusting the bias voltages to SPMArray2 A and SPMArray2 B, respectively.
Figure 4: SPMArray2 / SIB2316 Connections
Summary of Contents for SIB2316
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