US3585315A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Video playback amplifier with frequency compensation
Assignee: IIT Research Institute
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Filing: 1967-09-22
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Granted: 1971-06-15
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Expires: 1987-09-22
Abstract
Abstract A video playback amplifier with frequency compensation, employing a transistor amplifier having a relatively low input impedance, for example, wherein the input transistor of said amplifier is in common-base configuration, and an inductive transducer having a relatively low impedance operatively connected to said amplifier with the impedance of the transducer differing from that of the amplifier input by an amount and in such direction that the inductive reactance of the transducer and the low input resistance of the amplifier produce a current into the amplifier which is substantially constant over at least the midvideo frequency range.
Inventors
- 👤 Theodore R Shaifer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 09:49
CPC Classifications
H; H03; H03F; H03F1/00; H03F1/56; H03F1/42; H03F1/48; H04; H04N; H04N5/00; H04N5/76; H04N5/91; H04N5/93; H04N5/931; H04N5/9315
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
212 words
A video playback amplifier with frequency compensation, for video signals having a frequency responsive of over 1 MegaHertz down to at least 300 Hertz, comprising a transistor current amplifier functioning as a preamplifier for such video signals, and employing a common-base configuration with the emitter of such transistor comprising the amplifier input electrode and the collector forming the amplifier output electrode, load resistance means connected to the emitter of said transistor and of such value that the input circuit so formed has an impedance on the order of 50 ohms, and a transducer head, having an inductive pickup winding, means operatively connecting said winding to the transistor input circuit with such winding operatively shunting said load resistance means, said transducer winding having an inductance of less than 10 mh. to provide an impedance which differs from the amplifier input impedance by an amount and in such direction that the inductive reactance of the transducer and input resistance of the amplifier will produce a current at the amplifier input which is substantially constant over at least the midvideo range, and said inductance being such that when taken with stray capacity and leakage inductance present the resulting LC peaking will be at a frequency at least in the upper portion of said last-mentioned range.
Claim 2
Dependent Claim
212 words
A video playback amplifier with frequency compensation, for video signals having a frequency responsive of over 1 MegaHertz down to at least 300 Hertz, comprising a transistor current amplifier functioning as a preamplifier for such video signals, and employing a common-base configuration with the emitter of such transistor comprising the amplifier input electrode and the collector forming the amplifier output electrode, load resistance means connected to the emitter of said transistor and of such value that the input circuit so formed has an impedance on the order of 50 ohms, and a transducer head, having an inductive pickup winding, means operatively connecting said winding to the transistor input circuit with such winding operatively shunting said load resistance means, said transducer winding having an inductance of less than 10 mh. to provide an impedance which differs from the amplifier input impedance by an amount and in such direction that the inductive reactance of the transducer and input resistance of the amplifier will produce a current at the amplifier input which is substantially constant over at least the midvideo range, and said inductance being such that when taken with stray capacity and leakage inductance present the resulting LC peaking will be at a frequency at least in the upper portion of said last-mentioned range.
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) | 1974-06-14 | 1974-12-14 | 1975-06-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-14 | 1978-12-14 | 1979-06-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-14 | 1982-12-14 | 1983-06-15 | $7700.00 | Window Closed / Lapsed |