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Optimization of amplifier schematics “S6” of Mimosa22/bis

After irradiation the amplifier bias is/could be changed in a not favorable way. This is due to extra current between drain and source of the transistors. Optimization of amplifier schematics “S6” of Mimosa22/bis. MF. MLB. Low-pass filter. ML. feedback.

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Optimization of amplifier schematics “S6” of Mimosa22/bis

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  1. After irradiation the amplifier bias is/could be changed in a not favorable way. This is due to extra current between drain and source of the transistors Optimization of amplifier schematics “S6” of Mimosa22/bis MF MLB Low-pass filter ML feedback The most sensitive point for biasing amplifier is the input in Id out Pdiff / Nwell MA signal current Nwell / Pepi Possible solutions Try to vary transistors parameters (>36 versions) to find less dangerous bias point even if the average gain and noise is not affected Put disabling circuit in each pixel – disable noisy pixels by programming by JTAG Modify basic schematics in 3 different ways

  2. MF MLB Radiation Tolerant Enclosed Layout Transistor Optimization of amplifier schematics “S6” of Mimosa22/bis MF MLB ML Low-pass filter out ML feedback MA in Id out Pdiff / Nwell MA signal current MLB Nwell / Pepi Combination of two changes MLB MF ML MF ML MV Extra voltage shifting transistor MV out out MA MA

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