I worked with four engineers and a project scientist to design, develop, qualify/test a silicon photomultiplier (SiPM) preamplifier for photon pulses produced by plastic scintillator (each scintillator detector is 1.8 m $\times$ 6.35 mm). The preamp provides a gain of $\approx 4 \times 10^6$ and enough current drive for the signal to be sampled downstream.

The SiPM preamp is a custom design: cathode outputs of six sensors are summed and passed through a transimpedance stage. This output is split before being sent to the final current feedback stage. One higher gain output is used for $\beta$ measurements while the other low gain output is used for triggering.

Fourth generation preamp board.

To achieve highest possible $\Delta \beta / \beta$ the end-to-end timing resolution should be as high as possible. With the fourth generation boards we are able to exceed the requirement of 500 ps.

End-to-end timing performance.