Patent US4521912A successfully refreshed from Google Patents.
US4521912A
Expired / Lapsed
US
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Low power indicating circuit for a radio transmitter
Assignee: Ericsson Inc
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Filing: 1983-06-09
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Granted: 1985-06-04
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Expires: 2003-06-09
Abstract
Abstract Low power for a radio transmitter is indicated by an output power detector voltage falling below a low power reference voltage derived from an existing power control circuit.
Inventors
- 👤 Earnest A. Franke
- 👤 Wayne J. Faulkenberry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:12
CPC Classifications
H; H03; H03G; H03G3/00; H03G3/20; H03G3/30; H03G3/3036; H03G3/3042; H04; H04B; H04B17/00; H04B17/10; H04B17/101; H04B17/102; H04B17/15; H04B17/18
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
171 words
A low power indicating circuit for a radio transmitter comprising: a. an output power magnitude detector for coupling to the output of said radio transmitter and producing a power magnitude signal related thereto; b. first means for providing a selectable power magnitude reference signal; c. second means coupled to said output power magnitude detector and to said first means for producing a feedback signal for application to said radio transmitter to control said output power magnitude as a function of the selected power magnitude provided by said first means; d. a low power magnitude circuit coupled to said first means for selecting a low power magnitude signal therefrom; e. third means coupled to said output power magnitude detector and to said low power magnitude circuit for producing a low power signal in response to said power magnitude signal being less than said low power magnitude signal; f. and means coupled between said third means and said radio transmitter for shutting off said radio transmitter in response to said low power signal.
Claim 2
Dependent Claim
171 words
A low power indicating circuit for a radio transmitter comprising: a. an output power magnitude detector for coupling to the output of said radio transmitter and producing a power magnitude signal related thereto; b. first means for providing a selectable power magnitude reference signal; c. second means coupled to said output power magnitude detector and to said first means for producing a feedback signal for application to said radio transmitter to control said output power magnitude as a function of the selected power magnitude provided by said first means; d. a low power magnitude circuit coupled to said first means for selecting a low power magnitude signal therefrom; e. third means coupled to said output power magnitude detector and to said low power magnitude circuit for producing a low power signal in response to said power magnitude signal being less than said low power magnitude signal; f. and means coupled between said third means and said radio transmitter for shutting off said radio transmitter in response to said low power signal.
Claim 3
Dependent Claim
165 words
A low power indicating circuit for a radio transmitter comprising: a. an output power magnitude detector for coupling to the output of said radio transmitter and producing a power magnitude signal related thereto; b. first means for providing a selectable power magnitude reference signal; c. second means coupled to said output power magnitude detector and to said first means for producing a feedback signal for application to said radio transmitter to control said output power magnitude as a function of the selected power magnitude provided by said first means; d. a low power magnitude circuit coupled to said first means for selecting a low power magnitude signal therefrom; e. third means coupled to said output power magnitude detector and to said low power magnitude circuit for producing a low power signal in response to said power magnitude signal being less than said low power magnitude signal; f. and means coupled to said third means for providing an alarm in response to said low power signal.
Claim 4
Dependent Claim
165 words
A low power indicating circuit for a radio transmitter comprising: a. an output power magnitude detector for coupling to the output of said radio transmitter and producing a power magnitude signal related thereto; b. first means for providing a selectable power magnitude reference signal; c. second means coupled to said output power magnitude detector and to said first means for producing a feedback signal for application to said radio transmitter to control said output power magnitude as a function of the selected power magnitude provided by said first means; d. a low power magnitude circuit coupled to said first means for selecting a low power magnitude signal therefrom; e. third means coupled to said output power magnitude detector and to said low power magnitude circuit for producing a low power signal in response to said power magnitude signal being less than said low power magnitude signal; f. and means coupled to said third means for providing an alarm in response to said low power signal.
Claim 5
Dependent Claim
26 words
The indicating circuit of claim 2 wherein said low power magnitude circuit comprises a voltage divider circuit that provides a selected fraction of said reference signal.
Claim 6
Dependent Claim
35 words
The indicating circuit of claim 2 wherein said third means comprise a differential amplifier having one input connected to said output power magnitude detector and the other input connected to said low power magnitude circuit.
Claim 7
Dependent Claim
46 words
The indicating circuit of claim 3 wherein said third means comprise a differential amplifier having one input connected to said output power magnitude detector and the other input connected to said voltage divider circuit at the location which provides said selected fraction of said reference signal.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-06-03 | 1988-12-03 | 1989-06-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-06-03 | 1992-12-03 | 1993-06-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-06-03 | 1996-12-03 | 1997-06-04 | $7700.00 | Window Closed / Lapsed |