US3886452A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Linear electromagnetic systems
Assignee: AT&T Inc
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Filing: 1973-12-17
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Granted: 1975-05-27
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Expires: 1993-12-17
Abstract
Abstract If all voltages operative upon any system are caused to vary proportionately, the output signal derived therefrom must also vary in the same proportion. This principle is applied to such devices as amplifiers and frequency converters as a means of significantly extending their linear dynamic operating ranges.
Inventors
- 👤 Harold Seidel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 06:21
CPC Classifications
H; H03; H03G; H03G3/00; H03G3/20; H03G3/30; H03G3/3036; H03G3/3042; H03D; H03D7/00; H03D9/00; H03D9/06; H03D9/0608; H03F; H03F1/00; H03F1/02; H03F1/0205; H03F1/0211; H03F1/0216; H03F1/0222; H03F3/00; H03F3/189; H03F3/19; H03F3/20; H03F3/24; H03F2200/00; H03F2200/15; H03F2200/192; H03F2200/198; H03F2200/228
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
69 words
In combination: an electromagnetic wave system to which at least two externally applied voltages are applied, one of which is the useful input signal; separate means associated with each of the other of said applied voltages for continuously varying the instantaneous amplitude of each of said other voltages in proportion to the instantaneous amplitude of said useful input signal; and means for extracting an output signal from said system.
Claim 2
Dependent Claim
69 words
In combination: an electromagnetic wave system to which at least two externally applied voltages are applied, one of which is the useful input signal; separate means associated with each of the other of said applied voltages for continuously varying the instantaneous amplitude of each of said other voltages in proportion to the instantaneous amplitude of said useful input signal; and means for extracting an output signal from said system.
Claim 3
Dependent Claim
17 words
The combination according to claim 1 including means for neutralizing all significant internal voltages in said system.
Claim 4
Dependent Claim
24 words
The combination according to claim 1 wherein: said system is a frequency converter; said other applied voltages include an alternating current local oscillator voltage.
Claim 5
Dependent Claim
38 words
The combination according to claim 3 wherein said separate means includes a variable attenuator for controlling the instantaneous amplitude of the local oscillator voltage applied to said frequency converter at each instant over the entire period of operation.
Claim 6
Dependent Claim
39 words
The combination according to claim 3 wherein said separate means includes a variable gain amplifier for controlling the instantaneous amplitude of the local oscillator voltage applied to said frequency converter at each instant over the entire period of operation.
Claim 7
Dependent Claim
23 words
The combination according to claim 3 wherein said input signal and said local oscillator voltage are applied to separate terminals of said system.
Claim 8
Dependent Claim
24 words
The combination according to claim 3 wherein said input signal and said local oscillator voltage are applied to a common terminal of said system.
Claim 9
Dependent Claim
59 words
A frequency converter comprising: a veractor diode; means for applying an input across said diode; means for applying a local oscillator voltage across said diode; and means, responsive to the instantaneous amplitude of said input signal, for proportionately varying the instantaneous amplitude of said local oscillator voltage in time phase with the instantaneous amplitude variations of said input signal.
Claim 10
Dependent Claim
59 words
A frequency converter comprising: a veractor diode; means for applying an input across said diode; means for applying a local oscillator voltage across said diode; and means, responsive to the instantaneous amplitude of said input signal, for proportionately varying the instantaneous amplitude of said local oscillator voltage in time phase with the instantaneous amplitude variations of said input signal.
Claim 11
Dependent Claim
68 words
In combination: an amplifier; means for applying an input signal to said amplifier; means for applying dc voltages to said amplifier; means associated with each of said dc voltages for varying the instantaneous amplitude of all of said dc voltages in proportion to the instantaneous amplitude of said input signal at each instant over the period of operation; and means for extracting an output signal from said amplifier.
Claim 12
Dependent Claim
68 words
In combination: an amplifier; means for applying an input signal to said amplifier; means for applying dc voltages to said amplifier; means associated with each of said dc voltages for varying the instantaneous amplitude of all of said dc voltages in proportion to the instantaneous amplitude of said input signal at each instant over the period of operation; and means for extracting an output signal from said amplifier.
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) | 1978-05-26 | 1978-11-25 | 1979-05-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-26 | 1982-11-25 | 1983-05-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-26 | 1986-11-25 | 1987-05-27 | $7700.00 | Window Closed / Lapsed |