Patent US4499431A successfully refreshed from Google Patents.
US4499431A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Driver circuit configuration for the output stage of electronic power amplifiers
Assignee: SHIN-SHIRASUNA ELECTIC CORP
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Filing: 1982-05-03
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Granted: 1985-02-12
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Expires: 2002-05-03
Abstract
Abstract An apparatus for improving the salient properties of the output stages of electronic power amplifiers v.s. varying load conditions. A novel circuit, based on current feedback sensing the instantaneous drive current of the output devices, is used to linearize the output characteristics of the output devices. The important features, compared with the presently known and employed drive circuits, relate to a more linear transfer characteristic, much larger output current capability, and more output amplifier design.
Inventors
- 👤 Matti N. Otala
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 14:53
CPC Classifications
H; H03; H03F; H03F1/00; H03F1/32; H03F1/3217; H03F3/00; H03F3/30; H03F3/3069; H03F3/3076
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
102 words
A circuit for improving the characteristics of a transistorized power amplifier, comprising: a common collector stage, an inverted common collector stage together with a common emitter stage for driving said collector stage, and means associated with said stages for sensing the output current of said circuit; and means connected to said circuit for transforming said output current into a corresponding internal correction signal for compensating for nondesirable circuit characteristics upon changes in said output current, and means for compensating for variation in input current or voltage of said circuit, to thereby yield an output voltage essentially independent of load and signal characteristics.
Claim 2
Dependent Claim
102 words
A circuit for improving the characteristics of a transistorized power amplifier, comprising: a common collector stage, an inverted common collector stage together with a common emitter stage for driving said collector stage, and means associated with said stages for sensing the output current of said circuit; and means connected to said circuit for transforming said output current into a corresponding internal correction signal for compensating for nondesirable circuit characteristics upon changes in said output current, and means for compensating for variation in input current or voltage of said circuit, to thereby yield an output voltage essentially independent of load and signal characteristics.
Claim 3
Dependent Claim
12 words
A circuit according to claim 1, wherein said sensing means are resistors.
Claim 4
Dependent Claim
13 words
A circuit according to claim 1, wherein said sensing means are electronic means.
Claim 5
Dependent Claim
17 words
A circuit according to claim 1, further comprising means for protecting said circuit from excess power dissipation.
Claim 6
Dependent Claim
16 words
A circuit according to claim 1, further comprising means for protecting said circuit from excess overheating.
Claim 7
Dependent Claim
19 words
A circuit according to claim 1, further comprising means for protecting said circuit from excess power dissipation and overheating.
Claim 8
Dependent Claim
23 words
A circuit according to claim 1, comprising capacitive means in said common emitter stage to thereby increase the operation speed of said circuit.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-02-12 | 1988-08-13 | 1989-02-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-02-12 | 1992-08-13 | 1993-02-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-02-12 | 1996-08-13 | 1997-02-12 | $7700.00 | Window Closed / Lapsed |