US3810031A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Integrated amplifying device having low drift and method of compensating for the drift of an amplifying device
Assignee: Commissariat à l'Énergie Atomique et Aux Énergies Alternatives
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Filing: 1972-05-16
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Granted: 1974-05-07
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Expires: 1992-05-16
Abstract
Abstract The device comprises n amplifying stages placed in cascade and each comprising means for storing a value substantially proportional to the offset voltage of each stage and compensating for the offset voltage, and means for periodic control of the storage and compensation means. Storage and compensation operations are carried out on the one hand successively stage by stage in order that one stage should compensate for the imperfections of storage of the preceding stage and, on the other hand, for a period of very short duration compared with the time interval which elapses between two successive operations. The input of the first stage constituting the input of the device is provided with at least one switch for connecting said input to ground during the storage and compensation operation.
Inventors
- 👤 R Poujois
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:54
CPC Classifications
H; H03; H03F; H03F1/00; H03F1/30; H03F1/303; H03F3/00; H03F3/38; H03F3/387; H03F3/393
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
115 words
An amplifying device of the integrable type and having low drift, wherein said device comprises n amplifying stages placed in cascade and each comprising means for storing a value substantially proportional to the offset voltage of such stage and compensating for said offset voltage, and means for controlling the said storage and compensation means to carry out the storage and compensation operations successively stage by stage in such manner that each stage compensates for the imperfections of storage of the preceding stages, the input of the first stage constituting the input of said device being the only input of a stage with means to cancel out the input voltage during said storage and compensation operation.
Claim 2
Dependent Claim
115 words
An amplifying device of the integrable type and having low drift, wherein said device comprises n amplifying stages placed in cascade and each comprising means for storing a value substantially proportional to the offset voltage of such stage and compensating for said offset voltage, and means for controlling the said storage and compensation means to carry out the storage and compensation operations successively stage by stage in such manner that each stage compensates for the imperfections of storage of the preceding stages, the input of the first stage constituting the input of said device being the only input of a stage with means to cancel out the input voltage during said storage and compensation operation.
Claim 3
Dependent Claim
60 words
A device according to claim 1, wherein said means for controlling are provided with switches connected in parallel to each other by means of delay circuits so as to produce a relative displacement in time between the opening and closure of the switches belonging to successive stages, recurrent electric signals being applied to the circuit for controlling the first switch.
Claim 4
Dependent Claim
79 words
A device according to claim 1, wherein the stage having the order (n) comprises two amplifiers connected in cascade, wherein said storage and compensation means for the stage having the order (n) are constituted by a capacitor connected between said amplifiers of such stage, and wherein said control means comprise a switch for placing the output of the second amplifier of said stage having the order (n) in total negative feedback with the input thereof during said storage operation.
Claim 5
Dependent Claim
121 words
A device according to claim 1, wherein the amplifiers of the n stages are of the differential type having two inputs and two outputs of opposite polarity, each of the two channels of each amplifier being provided with a circuit for storage and compensation, said control means comprising means to connect each of the two inputs of the n amplifiers to ground by means of a switch and delay means controllinG the opening or closure of said switches to produce a relative displacement in time between the opening and closure of the switches of successive stages and closing the switches of the same stage concurrently, and means to apply recurrent electric signals to said delay means to effect recurrent operation thereof.
Claim 6
Dependent Claim
27 words
A device according to claim 1, wherein said control means comprise switches in the form of MOS transistors connected between the input of each stage and ground.
Claim 7
Dependent Claim
17 words
A device according to claim 1 wherein said device is constructed in accordance with the MOS technology.
Claim 8
Independent Claim
80 words
A method of compensation for the offset voltage of an amplifying device composed of a plurality of amplifier stages each with means for storing a value to compensate for the offset voltage of such stage, wherein said method comprises connecting said amplifier stages in cascade and, for each stage in turn, storing a value in the storage means of such stage compensating for the offset voltage of such stage and compensating for the imperfections of storage of the preceding stages.
Claim 9
Independent Claim
80 words
A method of compensation for the offset voltage of an amplifying device composed of a plurality of amplifier stages each with means for storing a value to compensate for the offset voltage of such stage, wherein said method comprises connecting said amplifier stages in cascade and, for each stage in turn, storing a value in the storage means of such stage compensating for the offset voltage of such stage and compensating for the imperfections of storage of the preceding stages.
Claim 10
Dependent Claim
39 words
A method according to claim 7, wherein the storage and compensation operation for all the stages aforesaid is carried out periodically with a frequency which is higher than the frequencies constituting the noise frequncy band of said amplifier stages.
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) | 1977-05-06 | 1977-11-05 | 1978-05-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-05-06 | 1981-11-05 | 1982-05-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-05-06 | 1985-11-05 | 1986-05-07 | $7700.00 | Window Closed / Lapsed |