US4608539A
Expired / Lapsed
US
⏱️ 0.0 years remaining
FM detector with injection locked divider input circuit
Assignee: Plessey Semiconductors Ltd
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Filing: 1984-11-16
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Granted: 1986-08-26
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Expires: 2004-11-16
Abstract
Abstract A frequency modulation detection arrangement comprises an FM detector and an injection-locked frequency divider arranged for receiving a radio signal and for providing a frequency divided radio signal in response thereto. The FM detector is coupled with the injection-locked frequency divider for receiving the frequency divided radio signal therefrom and for producing a signal indicative of the information content of the modulating wave of the radio signal.
Inventors
- 👤 Rodney J. Lawton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 17:28
CPC Classifications
H; H03; H03D; H03D3/00
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
102 words
A frequency modulation (FM) detection arrangement comprising: a frequency divider having a multiplier for providing a frequency divided signal in response to a radio signal having a modulating wave thereon received at a first input of said multiplier and in response to said frequency divided signal received, via a band-pass filter, at a second input of said multiplier; and an FM detector coupled to said frequency divider and having a phase-sensitive detector for receiving said frequency divided signal via first and second signal paths and for providing a signal indicative of the information content of the modulating wave of said radio signal.
Claim 2
Dependent Claim
102 words
A frequency modulation (FM) detection arrangement comprising: a frequency divider having a multiplier for providing a frequency divided signal in response to a radio signal having a modulating wave thereon received at a first input of said multiplier and in response to said frequency divided signal received, via a band-pass filter, at a second input of said multiplier; and an FM detector coupled to said frequency divider and having a phase-sensitive detector for receiving said frequency divided signal via first and second signal paths and for providing a signal indicative of the information content of the modulating wave of said radio signal.
Claim 3
Dependent Claim
42 words
A frequency modulation (FM) detection arrangement according to claim 1, wherein said second signal path of said phase-sensitive detector comprises a phase-quadrature device and a phase-shift means which shifts the phase of said frequency-divided radio signal in dependence upon the modulation thereof.
Claim 4
Dependent Claim
25 words
A frequency modulation (FM) detection arrangement according to claim 2, wherein said FM detector is coupled to said frequency divider prior to said band-pass filter.
Claim 5
Dependent Claim
24 words
A frequency modulation (FM) detection arrangement according to claim 2, wherein said FM detector is coupled to said frequency divider after said band-pass filter.
References Cited (Backward Citations)
GB620668A
Cited
GB627238A
Cited
GB682734A
Cited
GB713915A
Cited
GB771979A
Cited
US3702442A
Cited
US4509017A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-08-25 | 1990-02-24 | 1990-08-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-08-25 | 1994-02-24 | 1994-08-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-08-25 | 1998-02-24 | 1998-08-26 | $7700.00 | Window Closed / Lapsed |