Detector Front End Electronics

The operational amplifier (see Fig. 4) in the fan-out, the OPA350, is a single-supply rail-to-rail amplifier functioning from 0-5 volts. Its behaviour at cryogenic temperatures (77 K) is adequate for this application and it has proven to be reliable and repetitive after many thermal cycles.

Figure 3. Thermal considerations of the fan-out board.
Figure 4. Cold preamplifier schematic.

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