Patent US3708755A successfully refreshed from Google Patents.
US3708755A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Usting bridge circuit with negative feedback
Assignee: Individual
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Filing: 1971-02-01
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Granted: 1973-01-02
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Expires: 1991-02-01
Abstract
Abstract A self adjusting bridge circuit having a source of DC electrical power connected across two opposing corners of the bridge and having a first amplifier whose input circuit is interconnected across the other two opposing corners of the bridge wherein the output of the said first amplifier is connected to the input of a feedback amplifier, the output of which is connected back to one of said points of connection between the bridge and the input of the first amplifier, and wherein the current feedback from the feedback amplifier introduces negative feedback into the bridge.
Inventors
- 👤 R Ruehle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 13:12
CPC Classifications
H; H03; H03F; H03F1/00; H03F1/34
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
179 words
A self adjusting bridge circuit comprising: a source of D.C. electrical power; a pair of voltage dividers connected in electrical parallel, said voltage dividers each comprising two series connected resistance members selected so that a voltage greater than zero exists continuously between the points intermediate the ends of said resistance voltage dividers; means connecting said voltage dividers in electrical parallel with said power source; first amplifying means having a current sensitive input interconnecting points intermediate the ends of said resistance voltage dividers so that a current greater than zero flows continuously between said intermediate points; negative current feedback means including a second amplifier having a current output; means interconnecting said second amplifier input and the output of said first amplifying means; and means connecting the output of said second amplifier to one of said intermediate resistance points so that the current flowing between said intermediate points tends to assume a constant value where said first amplifier means is a transistor having base, emitter and collector elements, said base and emitter elements being respectively connected to the said intermediate points.
Claim 2
Dependent Claim
179 words
A self adjusting bridge circuit comprising: a source of D.C. electrical power; a pair of voltage dividers connected in electrical parallel, said voltage dividers each comprising two series connected resistance members selected so that a voltage greater than zero exists continuously between the points intermediate the ends of said resistance voltage dividers; means connecting said voltage dividers in electrical parallel with said power source; first amplifying means having a current sensitive input interconnecting points intermediate the ends of said resistance voltage dividers so that a current greater than zero flows continuously between said intermediate points; negative current feedback means including a second amplifier having a current output; means interconnecting said second amplifier input and the output of said first amplifying means; and means connecting the output of said second amplifier to one of said intermediate resistance points so that the current flowing between said intermediate points tends to assume a constant value where said first amplifier means is a transistor having base, emitter and collector elements, said base and emitter elements being respectively connected to the said intermediate points.
Claim 3
Dependent Claim
42 words
The combination of claim 1 where the feedback amplifier is a transistor having base, emitter and collector elements, said base being connected to the collector of said first amplifier and the collector being connected to the emitter of the said first amplifier.
Claim 4
Dependent Claim
18 words
The combination of claim 2 where the feedback output circuit includes a current sensitive means in series therewith.
Claim 5
Dependent Claim
20 words
The combination of claim 2 and further including resistance means interconnecting said base and emitter elements in said feedback amplifier.
References Cited (Backward Citations)
US3161821A
Cited
US3344283A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-01-02 | 1976-07-03 | 1977-01-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-02 | 1980-07-03 | 1981-01-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-02 | 1984-07-03 | 1985-01-02 | $7700.00 | Window Closed / Lapsed |