US4042887A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Broad band amplifier
Assignee: Q Bit Corp
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Filing: 1976-03-19
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Granted: 1977-08-16
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Expires: 1996-03-19
Abstract
Abstract Disclosed is a broad band amplifier for use as a preamplifier in TV receiving systems and in other applications where broad band amplification is desired. A ferrite directional coupler is used to negatively feed back a portion of the output of an amplifying stage to its input.
Inventors
- 👤 Hansel B. Mead
- 👤 Gary R. Callaway
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:36
CPC Classifications
H; H03; H03F; H03F1/00; H03F1/34; H03F1/345; H03F3/00; H03F3/60
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
126 words
A broad band amplifier comprising an input terminal and an output terminal, an amplifying stage coupled between said input and output terminals, a first ferrite directional coupler coupled to the output of said amplifying stage, said first directional coupler having a first output coupled to said output terminal and a second output, and a second ferrite directional coupler coupling said second output of said first directional coupler to the input of said amplifying stage, one of said directional couplers comprising a broad band 0° to 180° coupler, said second directional coupler applying said second output of said first coupler to the input of said amplifying stage as RF negative feedback whereby both said ferrite directional couplers are in the negative feedback loop of said amplifying stage.
Claim 2
Dependent Claim
126 words
A broad band amplifier comprising an input terminal and an output terminal, an amplifying stage coupled between said input and output terminals, a first ferrite directional coupler coupled to the output of said amplifying stage, said first directional coupler having a first output coupled to said output terminal and a second output, and a second ferrite directional coupler coupling said second output of said first directional coupler to the input of said amplifying stage, one of said directional couplers comprising a broad band 0° to 180° coupler, said second directional coupler applying said second output of said first coupler to the input of said amplifying stage as RF negative feedback whereby both said ferrite directional couplers are in the negative feedback loop of said amplifying stage.
Claim 3
Dependent Claim
15 words
An amplifier according to claim 1 wherein said first directional coupler comprises an in-phase splitter.
Claim 4
Dependent Claim
14 words
An amplifier according to claim 1 wherein said first coupler is a 3db coupler.
Claim 5
Dependent Claim
14 words
An amplifier according to claim 1 wherein said second coupler is a 12db coupler.
Claim 6
Dependent Claim
15 words
An amplifier according to claim 1 wherein said second directional coupler comprises an in-phase splitter.
Claim 7
Dependent Claim
14 words
An amplifier according to claim 1 wherein said second coupler is a 3db coupler.
Claim 8
Dependent Claim
14 words
An amplifier according to claim 1 wherein said first coupler is a 12db coupler.
Claim 9
Dependent Claim
102 words
A broad band amplifier comprising an input terminal and an output terminal, an amplifying stage coupled between said input and output terminals, a first directional coupler coupled to the output of said amplifying stage, said first directional coupler having a first output coupled to said output terminal and a second output, a second directional coupler coupling said second output to the input of said amplifying stage, and an additional amplifying stage coupled to said input terminal, said additional amplifying stage having a third directional coupler between its input and output for negatively feeding back a portion of its output to its input.
Claim 10
Dependent Claim
102 words
A broad band amplifier comprising an input terminal and an output terminal, an amplifying stage coupled between said input and output terminals, a first directional coupler coupled to the output of said amplifying stage, said first directional coupler having a first output coupled to said output terminal and a second output, a second directional coupler coupling said second output to the input of said amplifying stage, and an additional amplifying stage coupled to said input terminal, said additional amplifying stage having a third directional coupler between its input and output for negatively feeding back a portion of its output to its input.
Claim 11
Dependent Claim
20 words
An amplifier according to claim 8 wherein both said amplifying stages exhibit a 180° phase shift between input and output.
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) | 1980-08-15 | 1981-02-14 | 1981-08-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-15 | 1985-02-14 | 1985-08-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-15 | 1989-02-14 | 1989-08-16 | $7700.00 | Window Closed / Lapsed |