Patent ID: 9397626
Filing Date: 2016-07-19
CPC Classification: G01T,G06G,H01L,H03F

Claim Text:
1. A charge-sensitive amplifier for use in amplifying signals from a discrete particle detector, the charge--sensitive amplifier comprising: a field effect transistor for the receipt of said signals having a gate, source and drain, the gate having a gate bond pad that is connectable to the discrete particle detector via a wire bond connection; an amplifier having an input connected to the drain or source of the field effect transistor and an output connected through a feedback capacitor to the gate of the field effect transistor, characterised in that the plate of the feedback capacitor that is connected to the output electromagnetically shields part of a substrate electrically connected to signal ground such that parasitic capacitance attributable to the gate bond pad is effectively removed or made substantially less than capacitance attributable to the feedback capacitor.