History:
An amplifier/attenuator on each diagnostic signal. This was motivated by Jim Welch’s calibration procedure, which would benefit from seeing the loss location for hits on each fiber.
- The wire scanners need amplification, since only a small charge is kicked out by the wire. Jim needs attenuation, since he splats the entire bunch onto the wall of the beampipe. A fiber PLIC may be best with no gain or attenuation. The chips I use (two AD603s in cascade) give both gain and attenuation, depending on a control voltage.
- The gain control is exponential—a linear conversion from control voltage to dB of gain.
cascadedAD603amps.pdf
From Alan Fisher:
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