Charge-sensitive amplifier
AssigneeOxford Instruments Nanotechnolgy Tools Limited
InventorTawfic Nashashibi
Life of this patent
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Abstract
A charge-sensitive amplifier is disclosed for use in amplifying signals from a particle detector. This includes a field effect transistor having a gate, source and drain, the gate being connectable, using a gate pad, to the particle detector, for the receipt of said signals. Also included is 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. The gate pad of the field effect transistor is made to be integral with the feedback capacitor so as to reduce the capacitance of the device.
Claims18
A charge-sensitive amplifier for use in amplifying signals from a particle detector, the charge-sensitive amplifier comprising:—
- a field effect transistor having a gate, source and drain, the gate being connectable, using a gate pad, to the particle detector, for the receipt of said signals;
- 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 gate pad of the field effect transistor is integral with the feedback capacitor.
A particle analyser system comprising:—
- a charge-sensitive amplifier according to any of the preceding claims;
- and
- a particle detector having an output arranged to provide signals representative of detected particles for signal amplification by the charge-sensitive amplifier.
Dependencies are inferred from the claim text.