In this chapter we focus on the transistor-level implementation of front-end amplifiers, deriving guidelines for topology choice and transistor sizing. Most systems use as the input stage a singled ended cascode amplifier with a transimpedance feedback loop. As it was introduced in the previous chapters, the term “Charge Sensitive Amplifier” (CSA) is rigorously correct only if the feedback time constant is large enough that it does not contribute significantly to the overall signal shaping performed by the front-end. The optimization rules reported here are nevertheless valid also when the feedback resistor has a primary role in the signal processing, i.e. when it would be more appropriate to speak of ...
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