US3671877A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Push-pull amplifier
Assignee: US Philips Corp
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Filing: 1970-10-09
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Granted: 1972-06-20
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Expires: 1990-10-09
Abstract
Abstract A low-resistance push-pull amplifier in which the inclusion of a diode in the emitter lead and of transistors in the base leads of the amplifier provides a very high discrimination factor, while additional current sources for the quiescent current adjustment of the transistors may be dispensed with.
Inventors
- 👤 Rudy Johan Van Den Plassche
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 08:07
CPC Classifications
H; H03; H03F; H03F3/00; H03F3/34; H03F3/343; H03F3/347; H03F3/45; H03F3/45071; H03F3/45479
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
168 words
A low-resistance differential amplifier, comprising a first transistor having an emitter, a base and a collector, a second transistor having an emitter, a base and a collector, a diode, means for connecting the emitters of the first and second transistors to a source of constant potential through the diode, a third transistor having a base, a collector and an emitter, a fourth transistor having a base, a collector and an emitter, means for connecting the base and emitter of both the third and fourth transistors in parallel with the diode, means for connecting the collector of the third transistor to the base of the first transistor, means for connecting the collector of the fourth transistor to the base of the second transistor, the base of the first transistor thereby comprising a first input to the differential amplifier, the base of the second transistor thereby comprising a second input to the differential amplifier, and the collectors of the first and second transistors thereby forming outputs of the differential amplifier.
Claim 2
Dependent Claim
168 words
A low-resistance differential amplifier, comprising a first transistor having an emitter, a base and a collector, a second transistor having an emitter, a base and a collector, a diode, means for connecting the emitters of the first and second transistors to a source of constant potential through the diode, a third transistor having a base, a collector and an emitter, a fourth transistor having a base, a collector and an emitter, means for connecting the base and emitter of both the third and fourth transistors in parallel with the diode, means for connecting the collector of the third transistor to the base of the first transistor, means for connecting the collector of the fourth transistor to the base of the second transistor, the base of the first transistor thereby comprising a first input to the differential amplifier, the base of the second transistor thereby comprising a second input to the differential amplifier, and the collectors of the first and second transistors thereby forming outputs of the differential amplifier.
Claim 3
Dependent Claim
78 words
A differential amplifier as claimed in claim 1, wherein the means for connecting the collector of the third transistor to the base of the first transistor comprises a second diode, wherein the means for connecting the collector of the fourth transistor to the base of the second transistor comprises a third diode, the amplifier further comprising a capacitor, and means for connecting the collector of the third transistor to the collector of the fourth transistor through the capacitor.
References Cited (Backward Citations)
US3142807A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-06-20 | 1975-12-20 | 1976-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-20 | 1979-12-20 | 1980-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-20 | 1983-12-20 | 1984-06-20 | $7700.00 | Window Closed / Lapsed |