US3679989A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Clamp circuit for preventing saturation of operational amplifier
Assignee: RCA Corp
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Filing: 1970-11-16
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Granted: 1972-07-25
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Expires: 1990-11-16
Abstract
Abstract An input clamping circuit for use with an operational amplifier to prevent saturation of the amplifier and to prevent excessive input signals thereto by limiting the differential input voltage applied to the amplifier.
Inventors
- 👤 Gregg Joseph Thibodeau
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:13
CPC Classifications
H; H03; H03F; H03F1/00; H03F1/52; H03G; H03G11/00; H03G11/02; H03F2203/00; H03F2203/45; H03F2203/45552; H03F2203/45594
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
119 words
In combination, amplifier means having first and second input terminals and an output terminal, input means, first and second impedance means connected in series between said input means and said first input terminal of said amplifier means, third and fourth impedance means connected in series between said input means and said second input terminal of said amplifier means, feedback circuit means connected between said output terminal and said first input terminal of said amplifier means, and unidirectional conducting means comprising a pair of back-to-back diodes connected in parallel between the common junction of said first and second impedance means and the common junction of said third and fourth impedance means to control the signal level at said common junctions.
Claim 2
Dependent Claim
119 words
In combination, amplifier means having first and second input terminals and an output terminal, input means, first and second impedance means connected in series between said input means and said first input terminal of said amplifier means, third and fourth impedance means connected in series between said input means and said second input terminal of said amplifier means, feedback circuit means connected between said output terminal and said first input terminal of said amplifier means, and unidirectional conducting means comprising a pair of back-to-back diodes connected in parallel between the common junction of said first and second impedance means and the common junction of said third and fourth impedance means to control the signal level at said common junctions.
Claim 3
Dependent Claim
15 words
The combination recited in claim 1 wherein said amplifier means comprises a differential operational amplifier.
Claim 4
Dependent Claim
24 words
The combination recited in claim 1 wherein said first and third impedances are substantially identical, and said second and fourth impedances are substantially identical.
Claim 5
Dependent Claim
39 words
The combination recited in claim 1 including fifth impedance means connected from said second input terminal of said amplifier means to potential source means, said fifth impedance means and said feedback circuit means being substantially identical in impedance value.
Claim 6
Dependent Claim
14 words
The combination recited in claim 1 wherein said feedback circuit means comprises resistance means.
References Cited (Backward Citations)
US2951991A
Cited
US3447095A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-07-25 | 1976-01-24 | 1976-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-25 | 1980-01-24 | 1980-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-25 | 1984-01-24 | 1984-07-25 | $7700.00 | Window Closed / Lapsed |