Patent EP0354079A1 successfully refreshed from Google Patents.
Patent US4849707A successfully refreshed from Google Patents.
US4849707A
Expired / Lapsed
US
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High-precision amplification circuit of small size and low power consumption for integrated circuits
Assignee: STMicroelectronics SRL
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Filing: 1988-03-30
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Granted: 1989-07-18
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Expires: 2008-03-30
Abstract
Abstract The amplification circuit comprises an operational amplifier and two groups of capacitances in input and feedback association with the operational amplifier. 2-phase switching means are periodically switched between a position in which two other capacitance groups are charged at output voltage values equal but opposite in sign and a position in which said other capacitances cancel each other out.
Inventors
- 👤 Germano Nicollini
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 20:50
CPC Classifications
H; H03; H03F; H03F3/00; H03F3/005
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
195 words
High-precision amplification circuit for integrated circuits comprising an operations amplifier with a positive input, a negative input, a positive output, and a negative output characterized in that it comprises a first capacitance placed in series with said negative input and a second capacitance placed in series with said positive input, a third capacitance placed in feedback connection between said positive output and said negative input, a fourth capacitance placed in feedback connection between said negative output and said positive input, a fifth capacitance having a first electrode connected to said negative output and a sixth capacitance having a first electrode connected to said positive output, a seventh capacitance having a first electrode connected to said positive output and an eighth capacitance having a first electrode connected to said negative output, and periodic-switching means to connect alternately a second electrode of said fifth and sixth capacitances to a polarization voltage, or to said negative input and to said positive input respectively of the operational amplifier and connect simultaneously a second electrode of said seventh and eighth capacitances to said polarization voltage or to said negative input and to said positive input respectively of the operational amplifier.
Claim 2
Dependent Claim
195 words
High-precision amplification circuit for integrated circuits comprising an operations amplifier with a positive input, a negative input, a positive output, and a negative output characterized in that it comprises a first capacitance placed in series with said negative input and a second capacitance placed in series with said positive input, a third capacitance placed in feedback connection between said positive output and said negative input, a fourth capacitance placed in feedback connection between said negative output and said positive input, a fifth capacitance having a first electrode connected to said negative output and a sixth capacitance having a first electrode connected to said positive output, a seventh capacitance having a first electrode connected to said positive output and an eighth capacitance having a first electrode connected to said negative output, and periodic-switching means to connect alternately a second electrode of said fifth and sixth capacitances to a polarization voltage, or to said negative input and to said positive input respectively of the operational amplifier and connect simultaneously a second electrode of said seventh and eighth capacitances to said polarization voltage or to said negative input and to said positive input respectively of the operational amplifier.
Claim 3
Dependent Claim
19 words
Amplification circuit in accordance with claim 1 characterized in that said first and second capacitances are of equal value.
Claim 4
Dependent Claim
19 words
Amplification circuit in accordance with claim 1 characterized in that said third and fourth capacitances are of equal value.
Claim 5
Dependent Claim
21 words
Amplification circuit in accordance with claim 1 characterized in that said fifth, sixth, seventh and eighth capacitances are of equal value.
References Cited (Backward Citations)
US4609877A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-07-17 | 1993-01-16 | 1993-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-07-17 | 1997-01-16 | 1997-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-07-17 | 2001-01-16 | 2001-07-18 | $7700.00 | Window Closed / Lapsed |