US4176323A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transistorized power amplifier
Assignee: Harman International Industries Inc
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Filing: 1978-06-21
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Granted: 1979-11-27
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Expires: 1998-06-21
Abstract
Abstract A transistorized power amplifier includes a differential pair coupled to a push-pull driver. The latter provides an amplified signal to an output stage through a compound driver, which comprises a pair of complementary transistors. The collector of the input transistor of the compound driver is connected to the base of the other transistor in the compound driver.
Inventors
- 👤 Robert Odell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 00:13
CPC Classifications
H; H03; H03F; H03F3/00; H03F3/30; H03F3/3069; H03F3/3076; H03F3/3079
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
127 words
A transistor amplifier comprising an input, a push-pull driver transistor pair operatively connected to said input, first and second output stages, and first and second compound buffer stages respectively operatively connected intermediate the outputs of said push-pull driver and said first and second output stages, each of said first and second buffer stages comprising a first transistor and a second complementary transistor, the base of said first transistor being orperatively connected to an output of said push-pull driver, the collector of said first transistor being operatively connected to the base of said second transistor, the emitter of said first transistor being operatively connected to the collector of said second transistor, and the collector of said second transistor being operatively connected to an input of said output stage.
Claim 2
Dependent Claim
127 words
A transistor amplifier comprising an input, a push-pull driver transistor pair operatively connected to said input, first and second output stages, and first and second compound buffer stages respectively operatively connected intermediate the outputs of said push-pull driver and said first and second output stages, each of said first and second buffer stages comprising a first transistor and a second complementary transistor, the base of said first transistor being orperatively connected to an output of said push-pull driver, the collector of said first transistor being operatively connected to the base of said second transistor, the emitter of said first transistor being operatively connected to the collector of said second transistor, and the collector of said second transistor being operatively connected to an input of said output stage.
Claim 3
Dependent Claim
24 words
The amplifier of claim 1, wherein the collectors of said second transistors in said first and second transistors are operatively connected to one another.
References Cited (Backward Citations)
US3944944A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-11-26 | 1983-05-28 | 1983-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-11-26 | 1987-05-28 | 1987-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-11-26 | 1991-05-28 | 1991-11-27 | $7700.00 | Window Closed / Lapsed |