US3740657A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transistor push-pull amplifier
Assignee: Koninklijke Philips NV
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Filing: 1971-04-01
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Granted: 1973-06-19
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Expires: 1991-04-01
Abstract
Abstract A transistor amplifier includes two coupled push-pull amplifier stages and bias stabilization is achieved by the use of a diodetransistor combination in the emitter leads of the respective complementary transistors which comprise the first stage.
Inventors
- 👤 P Tharmaratnam
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 22:35
CPC Classifications
H; H03; H03F; H03F1/00; H03F1/30; H03F1/307; H03F3/00; H03F3/30; H03F3/3083; H03F3/3086; H03F3/3091; H03F3/34; H03F3/343; H03F3/347
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
174 words
A transistor amplifier comprising a first push-pull amplifier stage, said first stage comprising a pair of complementary transistors, means to interconnect the bases of the complementary transistors so that there is a negligibly small impedance therebetween, input signal means coupled to said bases, first and second current input means connected to the emitters of said complementary transistors, at least one diode in the emitter lead of one of the complementary transistors, a first transistor, means to couple the collector-emitter path of the first transistor in the emitter lead of the other of the complementary transistors, a second transistor, means to couple the collectoremitter path of the second transistor to shunt the collector-base path of the first transistor, a second diode, means to couple the second diode to shunt the collector-base path of the second transistor, said diodes being poled in a current carrying direction, a second push-pull amplifier stage, means to couple the collector currents of the complementary transistors to the second stage and means for deriving an output signal from said second stage.
Claim 2
Dependent Claim
174 words
A transistor amplifier comprising a first push-pull amplifier stage, said first stage comprising a pair of complementary transistors, means to interconnect the bases of the complementary transistors so that there is a negligibly small impedance therebetween, input signal means coupled to said bases, first and second current input means connected to the emitters of said complementary transistors, at least one diode in the emitter lead of one of the complementary transistors, a first transistor, means to couple the collector-emitter path of the first transistor in the emitter lead of the other of the complementary transistors, a second transistor, means to couple the collectoremitter path of the second transistor to shunt the collector-base path of the first transistor, a second diode, means to couple the second diode to shunt the collector-base path of the second transistor, said diodes being poled in a current carrying direction, a second push-pull amplifier stage, means to couple the collector currents of the complementary transistors to the second stage and means for deriving an output signal from said second stage.
Claim 3
Dependent Claim
38 words
An amplifier as claimed in claim 1, wherein the second stage comprises a second pair of complementary transistors, the emitter-collector paths of the second complementary pair being in series with a supply voltage source for the transistor amplifier.
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) | 1976-06-18 | 1976-12-18 | 1977-06-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-18 | 1980-12-18 | 1981-06-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-18 | 1984-12-18 | 1985-06-19 | $7700.00 | Window Closed / Lapsed |