US3668540A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Integrated video amplifier
Assignee: Signetics Corp
•
Filing: 1970-07-13
•
Granted: 1972-06-06
•
Expires: 1990-07-13
Abstract
Abstract Integrated video amplifier having an output voltage which is accurately held to one-half of the supply voltage and which utilizes a class B output stage.
Inventors
- 👤 Hans R Camenzind
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 17:51
CPC Classifications
H; H03; H03F; H03F3/00; H03F3/30; H03F3/3083; H03F3/3084; H03F3/189; H03F3/19; H03F3/195; H03F3/42
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
244 words
In an integrated video amplifier, a unitary semiconductor structure and means forming an input, fIrst and second transistor amplifier stages formed in said semiconductor structure, each of said amplifier stages having at least one transistor with a base, a collector and an emitter, means connecting said input to the base of the transistor of the first transistor amplifier stage, means for biasing said first and second transistor amplifier stages including a first additional transistor having characteristics substantially identical to the transistor in the first transistor amplifier stage, a second additional transistor having characteristics substantially identical to the transistor in the second transistor amplifier stage, means connecting an output terminal to one of said additional transistors to an input terminal of the other of said additional transistors, means providing a supply voltage, an output stage including an output terminal, said second transistor amplifier stage forming a portion of said output stage, said biasing means also including first resistor means formed in said semiconductor structure and coupled between coupled output terminals of said first and second additional transistors which determine the current flow through said first resistor means and said output terminal, and second resistor means formed in said structure coupled between said first and second amplifier means and said supply voltage means said first and second resistor means having substantially identical characteristics to provide a constant ratio of resistance values such ratio determining the portion of said supply voltage which appears at said output terminal.
Claim 2
Dependent Claim
244 words
In an integrated video amplifier, a unitary semiconductor structure and means forming an input, fIrst and second transistor amplifier stages formed in said semiconductor structure, each of said amplifier stages having at least one transistor with a base, a collector and an emitter, means connecting said input to the base of the transistor of the first transistor amplifier stage, means for biasing said first and second transistor amplifier stages including a first additional transistor having characteristics substantially identical to the transistor in the first transistor amplifier stage, a second additional transistor having characteristics substantially identical to the transistor in the second transistor amplifier stage, means connecting an output terminal to one of said additional transistors to an input terminal of the other of said additional transistors, means providing a supply voltage, an output stage including an output terminal, said second transistor amplifier stage forming a portion of said output stage, said biasing means also including first resistor means formed in said semiconductor structure and coupled between coupled output terminals of said first and second additional transistors which determine the current flow through said first resistor means and said output terminal, and second resistor means formed in said structure coupled between said first and second amplifier means and said supply voltage means said first and second resistor means having substantially identical characteristics to provide a constant ratio of resistance values such ratio determining the portion of said supply voltage which appears at said output terminal.
Claim 3
Dependent Claim
50 words
An amplifier according to claim 1 where the base of said one additional transistor provides a second input and said second additional transistor includes an emitter coupled resistor and such resistor in ratio with said first resistor means provides a feedback signal from said output terminal to said second input.
Claim 4
Dependent Claim
13 words
An amplifier as in claim 1 where said ratio is equal to one.
References Cited (Backward Citations)
US3416092A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-06-06 | 1975-12-06 | 1976-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-06 | 1979-12-06 | 1980-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-06 | 1983-12-06 | 1984-06-06 | $7700.00 | Window Closed / Lapsed |