US3634767A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Radiometer detector circuit
Assignee: SP-MICROWAVE Inc
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Filing: 1970-03-12
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Granted: 1972-01-11
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Expires: 1990-03-12
Abstract
Abstract A detector circuit for efficiently demodulating carrier signals having imposed upon them amplitude modulation data representing the radiometric difference in effective temperature between an unknown source of very high frequency signals and a standard reference is disclosed.
Inventors
- 👤 Robert S Roeder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:58
CPC Classifications
H; H03; H03D; H03D1/00; H03D1/08; H03D1/10; E; E05; E05C; E05C3/00; E05C3/12; E05C3/14
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
271 words
A switching-modulation detector circuit, adapted for receiving amplitude-modulation signals generated in a switching comparison high-frequency radiometer system, comprising: transformer means having first and second coupled windings, input means connected across said first winding, first, second, and third conductor means, said first and second conductor means being connected to said second winding, said third conductor means Being connected to said first winding, said first and third conductor means being adapted to serve as output means, first and second diode means, said first diode means being serially connected within said first conductor means, said second diode means being connected to said first conductor means between said first diode means and said second winding and to said third conductor means, first and second capacitor means, said first capacitor means being connected to said first conductor means on the side of said first diode means remote from said second winding and to said second conductor means, said second capacitor means being connected to said second and third conductor means adjacent said first capacitor means, first and second resistor means respectively connected in shunt across said first and second capacitor means, and adjustable unidirectional bias current source means connected to said first and third conductor means, said first and second diode means being so poled and so coupled to said condenser means and said resistor means as to remove said amplitude modulation signal from said amplitude-modulated signal for supply to said output means, said bias source means being so cooperatively arranged and connected as to supply bias current in series relation through a said first and second diode means for improving the efficiency of operation thereof.
Claim 2
Dependent Claim
271 words
A switching-modulation detector circuit, adapted for receiving amplitude-modulation signals generated in a switching comparison high-frequency radiometer system, comprising: transformer means having first and second coupled windings, input means connected across said first winding, first, second, and third conductor means, said first and second conductor means being connected to said second winding, said third conductor means Being connected to said first winding, said first and third conductor means being adapted to serve as output means, first and second diode means, said first diode means being serially connected within said first conductor means, said second diode means being connected to said first conductor means between said first diode means and said second winding and to said third conductor means, first and second capacitor means, said first capacitor means being connected to said first conductor means on the side of said first diode means remote from said second winding and to said second conductor means, said second capacitor means being connected to said second and third conductor means adjacent said first capacitor means, first and second resistor means respectively connected in shunt across said first and second capacitor means, and adjustable unidirectional bias current source means connected to said first and third conductor means, said first and second diode means being so poled and so coupled to said condenser means and said resistor means as to remove said amplitude modulation signal from said amplitude-modulated signal for supply to said output means, said bias source means being so cooperatively arranged and connected as to supply bias current in series relation through a said first and second diode means for improving the efficiency of operation thereof.
Claim 3
Dependent Claim
17 words
Apparatus as described in claim 1 wherein said input means comprises first and second coaxially arranged conductors.
Claim 4
Dependent Claim
28 words
Apparatus as described in claim 2 wherein said transformer means comprises a voltage step-up transformer for improving the impedance match between said input means and said diode means.
Claim 5
Dependent Claim
15 words
Apparatus as described in claim 3 wherein said diode means comprise point contact semiconductor diodes.
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) | 1975-01-10 | 1975-07-12 | 1976-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-10 | 1979-07-12 | 1980-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-10 | 1983-07-12 | 1984-01-11 | $7700.00 | Window Closed / Lapsed |