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US 4,053,847 AGranted
Self-feedback type low-noise charge sensitive amplifier
AssigneeJapan Atomic Energy Research Institute
InventorsTadashi Kumahara, Seturo Kinbara
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Abstract
A so-called charge sensitive amplifier is used as a pre-amplifier for a semiconductor detector. A field-effect transistor (FET) is used as the input stage of the amplifier, wherein the gate terminal of the FET is fed back from the output of the amplifier and the drain terminal of the FET is grounded through a capacitor and connected to a constant current source to make the drain voltage change correspond to the gate potential. The gate potential is self-stabilized.
Claims3
A self-feedback low-noise charge sensitive amplifier comprising
- an input stage including a junction type field-effect transistor (FET) as the active element thereof, said FET having source, drain and gate terminals,
- a transistor having an emitter electrode coupled to the source terminal of said FET, a base electrode connected to ground and a collector electrode,
- an amplifier having an input terminal connected to the collector electrode of said transistor and an output terminal coupled to the gate terminal of said FET, and
- a capacitor having one end grounded and the other end connected to the drain terminal of said FET, said capacitor stabilizing the gate potential of said FET and changing the drain terminal voltage of said FET in response to a change in the potential at the gate terminal of said FET.
1 more element
Dependencies are inferred from the claim text.