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US4053847A
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US
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Self-feedback type low-noise charge sensitive amplifier
Assignee: Japan Atomic Energy Agency
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Filing: 1976-03-24
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Granted: 1977-10-11
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Expires: 1996-03-24
Abstract
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.
Inventors
- 👤 Tadashi Kumahara
- 👤 Seturo Kinbara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 16:21
CPC Classifications
H; H03; H03F; H03F3/00; H03F3/70; H04; H04B; H04B10/00; H04B10/60; H04B10/66; H04B10/69; H03F2200/00; H03F2200/372
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
132 words
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.
Claim 2
Dependent Claim
132 words
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.
Claim 3
Dependent Claim
26 words
A self-feedback low-noise charge sensitive amplifier as defined in claim 1, wherein the drain terminal of said FET is further connected to a constant current source.
Claim 4
Dependent Claim
33 words
A self-feedback low-noise charge sensitive amplifier as defined in claim 1, wherein a constant current source circuit is interposed between the source terminal of said FET and the emitter electrode of said transistor.
References Cited (Backward Citations)
US3611173A
Cited
US3801933A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-10-10 | 1981-04-11 | 1981-10-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-10-10 | 1985-04-11 | 1985-10-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-10-10 | 1989-04-11 | 1989-10-11 | $7700.00 | Window Closed / Lapsed |