US3750038A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Amplifier circuit for coincidentally providing signal clamping operation
Assignee: Jerrold Electronics Corp
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Filing: 1971-11-12
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Granted: 1973-07-31
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Expires: 1991-11-12
Abstract
Abstract A video amplifier for coincidentally clamping synchronizing pulse peaks (tips) to a reference potential to effect direct current restoration employs a difference amplifier with alternating and direct current feedback network paths. The d.c. feedback structure includes a periodically enabled diodecapacitor network for establishing the circuit clamping potential, while the difference amplifier and the operatively distinct a.c. feedback circuitry function in an operational amplifier mode to amplify the video intelligence.
Inventors
- 👤 W Meise
- 👤 H Marron
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 22:42
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/14; H04N5/16; H04N5/165
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
80 words
In combination in a signal translating circuit, a direct current difference amplifier including inverting and noninverting input terminals and an output terminal, first feedback means including a series connected diode and capacitor connected to said amplifier output terminal, first connecting means for connecting said amplifier inverting input terminal and said capacitor, two series connected impedances connected to said amplifier output terminal, and additional capacitor means connecting said amplifier inverting input terminal and the junction point between said series connected impedances.
Claim 2
Dependent Claim
80 words
In combination in a signal translating circuit, a direct current difference amplifier including inverting and noninverting input terminals and an output terminal, first feedback means including a series connected diode and capacitor connected to said amplifier output terminal, first connecting means for connecting said amplifier inverting input terminal and said capacitor, two series connected impedances connected to said amplifier output terminal, and additional capacitor means connecting said amplifier inverting input terminal and the junction point between said series connected impedances.
Claim 3
Dependent Claim
15 words
A combination as in claim 1, wherein said first connecting means comprises voltage divider means.
Claim 4
Dependent Claim
15 words
A combination as in claim 2, further comprising a voltage source connected to said capacitor.
Claim 5
Dependent Claim
19 words
A combination as in claim 1, further comprising a source of video signals connected to said series connected impedances.
Claim 6
Dependent Claim
22 words
A combination as in claim 1, further comprising means for impressing a fixed potential at said noninverting input terminal of said amplifier.
Claim 7
Dependent Claim
36 words
A combination as in claim 1, wherein said amplifier comprises two differentially connected transistors of a first conductivity type, and a transistor of the opposite conductivity type directly coupled to one of said differentially connected transistors.
Claim 8
Dependent Claim
100 words
In combination in a combined video amplifier and clamp circuit, a direct current differential amplifier having inverting and noninverting input terminals and an output terminal, means for supplying a direct current potential to said noninverting input terminal, peak detecting means connecting said amplifier output and inverting input terminals, said peak detecting means comprising a diode conductive during the synchronizing pulse tip intervals of the applied video wave and a storage capacitor, amplification determining, series connected feedback and input resistors, and a direct current blocking capacitor conNecting said amplifier inverting input terminal and the junction of said feedback and input resistors.
Claim 9
Dependent Claim
100 words
In combination in a combined video amplifier and clamp circuit, a direct current differential amplifier having inverting and noninverting input terminals and an output terminal, means for supplying a direct current potential to said noninverting input terminal, peak detecting means connecting said amplifier output and inverting input terminals, said peak detecting means comprising a diode conductive during the synchronizing pulse tip intervals of the applied video wave and a storage capacitor, amplification determining, series connected feedback and input resistors, and a direct current blocking capacitor conNecting said amplifier inverting input terminal and the junction of said feedback and input resistors.
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) | 1976-07-30 | 1977-01-29 | 1977-07-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-30 | 1981-01-29 | 1981-07-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-30 | 1985-01-29 | 1985-07-31 | $7700.00 | Window Closed / Lapsed |