Patent US3665330A successfully refreshed from Google Patents.
US3665330A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transistor amplifier insensitive to the polarity of the supply voltage
Assignee: US Philips Corp
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Filing: 1970-07-10
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Granted: 1972-05-23
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Expires: 1990-07-10
Abstract
Abstract A transistor amplifier comprising at least two output transistors having their emitters connected together, their collectors connected to different D-C supply voltages and diodes connected across the emitter and collector terminals of each transistor. In accordance with the polarity of the supply voltage, either one of the transistors can be made to cooperate with the diode across the other transistor that is not operating thereby resulting in amplification of an input signal independent of the polarity of the supply voltage. The circuit is suitable for use in integrated circuits.
Inventors
- 👤 Poothathamby Tharmaratnam
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:12
CPC Classifications
H; H10; H10D; H10D84/00; H10D84/60; H10D84/611; H10D84/613; H10D84/617; H03; H03F; H03F3/00; H03F3/181; H03F3/183; H03F3/187; H03F3/34; H03F3/343; H03F3/347; H03F3/68; H04; H04M; H04M1/00; H04M1/60; H04M1/6008
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
123 words
An amplifier insensitive to the polarity of a supply voltage comprising signal input means, first and second transistors of the same type coupled to and amplifying signals received in phase from said input means, first and second output terminals, said first transistor having its collector connected to said first output terminal and its emitter connected to said second output terminal through the emitter - collector path of said second transistor, and first and second diodes connected across the emitters and collectors of said first and second transistors respectively, each diode arranged to conduct when said respective transistor is not operating, said supply voltage being coupled to said output terminals, the polarity of said supply voltage determining the sequence of operation of said transistors.
Claim 2
Dependent Claim
123 words
An amplifier insensitive to the polarity of a supply voltage comprising signal input means, first and second transistors of the same type coupled to and amplifying signals received in phase from said input means, first and second output terminals, said first transistor having its collector connected to said first output terminal and its emitter connected to said second output terminal through the emitter - collector path of said second transistor, and first and second diodes connected across the emitters and collectors of said first and second transistors respectively, each diode arranged to conduct when said respective transistor is not operating, said supply voltage being coupled to said output terminals, the polarity of said supply voltage determining the sequence of operation of said transistors.
Claim 3
Dependent Claim
101 words
A transistor amplifier circuit as claimed in claim 1 wherein said first and second transistors are coupled to said signal input means through a plurality of transistors, the base of said first transistor being coupled through the base emitter paths of a first series of said plurality of transistors, the base of said second transistor being coupled through the base - emitter paths of a second series of said plurality of transistors, the collectors of said first series transistors being connected to said first output terminal and the collectors of said second series transistors being connected to said second output terminal.
Claim 4
Dependent Claim
28 words
A transistor amplifier circuit as claimed in claim 2 further comprising first and second diodes coupling said first and second series transistors respectively to said signal input means.
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) | 1975-05-23 | 1975-11-22 | 1976-05-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-23 | 1979-11-22 | 1980-05-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-23 | 1983-11-22 | 1984-05-23 | $7700.00 | Window Closed / Lapsed |