US3789141A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Burst amplifiers for color television receivers
Assignee: Hitachi Ltd
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Filing: 1972-04-25
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Granted: 1974-01-29
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Expires: 1992-04-25
Abstract
Abstract An amplifier used for extracting a color burst signal from the chrominance signal in color television receivers, which includes no resonant-circuit but comprises three pairs of transistors and which is especially suitable for fabrication in the form of an integrated circuit.
Inventors
- 👤 S Ayaki
- 👤 M Shimano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 08:35
CPC Classifications
H; H04; H04N; H04N9/00; H04N9/44; H04N9/455
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
354 words
A burst amplifier for color television receivers comprising; a first pair of transistors, the emitters of the first and the second transistors in said first pair being connected to ground through a transistor whose base is connected to a source of constant voltage; a second and a third pair of transistors, the emitters of the first and the second transistors in said second pair being connected to the collector of the first transistor in said first pair, the emitters of the first and the second transisters in said third pair being connected to the collector of the second transistor in said first pair, the base of the first transistor in said second pair and the base of the second transistor in said third pair being connected together, the base of the second transistor in said second pair and the base of the first transistor in said third pair being connected together, the collector of the first transistor in said second pair and the collector of the first transistor in said third pair being connected to a first power supply, and the collector of the second transistor in said second pair and the collectOr of the second transistor in said third pair being connected together; a load connected between said first power supply and the connecting point of the collectors of the second transistors in said second and third pair; a fourth pair of transistors, the emitters of the first and the second transistors in said fourth pair being connected together, the collector of the first transistor in said fourth pair being connected to a second power supply, the collector of the second transistors in said fourth pair being connected through a resistor to said second power supply; means for connecting the collector of the first transistor in said fourth pair through a resistor to one of connecting points of the bases of the transistors in said second and third pair; and means for connecting the collector of the second transistor in said fourth pair to the other one of the connecting points of the bases of the transistor in said second and third pairs.
Claim 2
Dependent Claim
354 words
A burst amplifier for color television receivers comprising; a first pair of transistors, the emitters of the first and the second transistors in said first pair being connected to ground through a transistor whose base is connected to a source of constant voltage; a second and a third pair of transistors, the emitters of the first and the second transistors in said second pair being connected to the collector of the first transistor in said first pair, the emitters of the first and the second transisters in said third pair being connected to the collector of the second transistor in said first pair, the base of the first transistor in said second pair and the base of the second transistor in said third pair being connected together, the base of the second transistor in said second pair and the base of the first transistor in said third pair being connected together, the collector of the first transistor in said second pair and the collector of the first transistor in said third pair being connected to a first power supply, and the collector of the second transistor in said second pair and the collectOr of the second transistor in said third pair being connected together; a load connected between said first power supply and the connecting point of the collectors of the second transistors in said second and third pair; a fourth pair of transistors, the emitters of the first and the second transistors in said fourth pair being connected together, the collector of the first transistor in said fourth pair being connected to a second power supply, the collector of the second transistors in said fourth pair being connected through a resistor to said second power supply; means for connecting the collector of the first transistor in said fourth pair through a resistor to one of connecting points of the bases of the transistors in said second and third pair; and means for connecting the collector of the second transistor in said fourth pair to the other one of the connecting points of the bases of the transistor in said second and third pairs.
Claim 3
Dependent Claim
428 words
A burst amplifier for color television receivers comprising; a first pair of transistors, the emitters of the first and the second transistors in said first pair being connected to ground through a transistor whose basE is connected to a source of a constant voltage; a second and a third pair of transistors, the emitters of the first and the second transistors in said second pair being connected to the collector of the first transistor in said first pair, the emitters of the first and the second transistors in said third pair being connected to the collector of the second transistor in said pair, the base of the first transistor in said second pair and the base of the second transistor in said third pair being connected together, the base of the second transistor in said second pair and the base of the first transistor in said third pair being connected together, the collector of the first transistor in said second pair and the collector of the first transistor in said third pair being connected to a first power supply, and the collector of the second transistor in said second pair and the collector of the second transistor in said third pair being connected together; a load connected between said first power supply and the connecting point of the collectors of the second transistors in said second and third pair; a fourth pair of transistors, the emitters of the first and the second transistors in said fourth pair being connected to ground through a transistor whose base is connected to said source of constant voltage, the collector of the first transistor in said fourth pair being connected to a second power supply, the collector of the second transistor in said fourth pair being connected through a first resistor to said second power supply, means for connecting the collector of the first transistor in said fourth pair through a second resistor to one of connecting points of the bases of the transistors in said second and third pair; means for connecting the collector of the second transistor in said fourth pair to the other one of the connecting points of the bases of the transistor in said second and third pair; means for supplying a chrominance signal to one of the bases of the first and the second transistors in said first pair; means for supplying a gating pulse to one of the bases of the first and the second transistors in said fourth pair; and means for deriving a burst signal contained in said chrominance signal across said load.
Claim 4
Dependent Claim
428 words
A burst amplifier for color television receivers comprising; a first pair of transistors, the emitters of the first and the second transistors in said first pair being connected to ground through a transistor whose basE is connected to a source of a constant voltage; a second and a third pair of transistors, the emitters of the first and the second transistors in said second pair being connected to the collector of the first transistor in said first pair, the emitters of the first and the second transistors in said third pair being connected to the collector of the second transistor in said pair, the base of the first transistor in said second pair and the base of the second transistor in said third pair being connected together, the base of the second transistor in said second pair and the base of the first transistor in said third pair being connected together, the collector of the first transistor in said second pair and the collector of the first transistor in said third pair being connected to a first power supply, and the collector of the second transistor in said second pair and the collector of the second transistor in said third pair being connected together; a load connected between said first power supply and the connecting point of the collectors of the second transistors in said second and third pair; a fourth pair of transistors, the emitters of the first and the second transistors in said fourth pair being connected to ground through a transistor whose base is connected to said source of constant voltage, the collector of the first transistor in said fourth pair being connected to a second power supply, the collector of the second transistor in said fourth pair being connected through a first resistor to said second power supply, means for connecting the collector of the first transistor in said fourth pair through a second resistor to one of connecting points of the bases of the transistors in said second and third pair; means for connecting the collector of the second transistor in said fourth pair to the other one of the connecting points of the bases of the transistor in said second and third pair; means for supplying a chrominance signal to one of the bases of the first and the second transistors in said first pair; means for supplying a gating pulse to one of the bases of the first and the second transistors in said fourth pair; and means for deriving a burst signal contained in said chrominance signal across said load.
References Cited (Backward Citations)
US3628046A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-01-28 | 1977-07-30 | 1978-01-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-28 | 1981-07-30 | 1982-01-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-28 | 1985-07-30 | 1986-01-29 | $7700.00 | Window Closed / Lapsed |