US5371472A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Charge amplifier for sensors outputting electrical charge
Assignee: Siemens AG
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Filing: 1993-01-14
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Granted: 1994-12-06
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Expires: 2013-01-14
Abstract
Abstract A charge amplifier for sensors outputting electrical charge, particularly for piezoceramic pressure sensors, includes a voltage integrator having an output, an integration capacitor and a resistor connected parallel to the integration capacitor. A current-to-voltage converter is connected upstream of the voltage integrator and has an input. A negative feedback branch has a series circuit of a farther voltage integrator and a voltage-to-current converter. The negative feedback branch is connected between the output of the voltage integrator and the input of the current-to-voltage converter.
Inventors
- 👤 Franz Wohlstreicher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 09:15
CPC Classifications
G; G01; G01L; G01L1/00; G01L1/16; G01L23/00; G01L23/08; G01L23/10; G01L23/22; G01L23/221; G01L23/222; G01L23/225; G01L9/00; G01L9/08; G01L9/085
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
79 words
A charge amplifier for sensors outputting electrical charge, comprising: a voltage integrator having an output, an integration capacitor and a resistor connected parallel to said integration capacitor; a current-to-voltage converter being connected upstream of said voltage integrator and having an input; and a negative feedback branch including a series circuit of a further voltage integrator and a voltage-to-current converter, said negative feedback branch being connected between the output of said voltage integrator and the input of said current-to-voltage converter.
Claim 2
Dependent Claim
79 words
A charge amplifier for sensors outputting electrical charge, comprising: a voltage integrator having an output, an integration capacitor and a resistor connected parallel to said integration capacitor; a current-to-voltage converter being connected upstream of said voltage integrator and having an input; and a negative feedback branch including a series circuit of a further voltage integrator and a voltage-to-current converter, said negative feedback branch being connected between the output of said voltage integrator and the input of said current-to-voltage converter.
Claim 3
Dependent Claim
17 words
The charge amplifier according to claim 1, wherein said current-to-voltage converter is connected as a current amplifier.
Claim 4
Dependent Claim
64 words
The charge amplifier according to claim 1, including a voltage divider being connected between the output of said voltage integrator and reference potential of a voltage supply, said voltage divider having a tap, said voltage integrator having an input, and said resistor connected parallel to said integration capacitor being connected between said tap of said voltage divider and the input of said voltage integrator.
Claim 5
Dependent Claim
14 words
The charge amplifier according to claim 1, wherein said voltage-to-current converter is a resistor.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-12-05 | 1998-06-06 | 1998-12-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-12-05 | 2002-06-06 | 2002-12-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-12-05 | 2006-06-06 | 2006-12-06 | $7700.00 | Window Closed / Lapsed |