US3777181A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Phase discatector
Assignee: Raytheon Co
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Filing: 1972-04-27
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Granted: 1973-12-04
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Expires: 1992-04-27
Abstract
Abstract An improved circuit having both frequency discriminator and phase detector functions is disclosed. The circuit functions as a frequency discriminator for signals relatively far removed from a predetermined acquisition frequency range, thereby providing a coarse lock-on for acquisition. After acquisition the circuit functions as a phase detector for phase lock purposes. Thus, the discatector or dual function discriminator-phase detector eliminates the requirement for sweeping or presetting a voltage controlled oscillator when used in a phase lock loop wherein the open loop frequency drifts are larger than the acquisition range of the loop or where multiple channel operation is required.
Inventors
- 👤 C Bancroft
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:45
CPC Classifications
H; H03; H03D; H03D13/00; H03D13/007; H03L; H03L7/00; H03L7/06; H03L7/08; H03L7/10
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
210 words
A phase discatector circuit functioning as a frequency discriminator circuit for input signals having frequencies removed from a predetermined lock-on frequency and functioning as a phase detector after said predetermined lock-on frequency has been acquired comprising, in combination: a phase splitter having an input port and a pair of push-pull output ports; circuit input means coupled to said input port of said phase splitter; a phase shifter having a pair of push-pull input ports and an output port, the output of said phase shifter having a phase between 0* and 180* depending upon the frequency of said input signal; a summing network having a pair of input ports and an output port, the first input port being coupled to said phase shifter output and a second input port being coupled to a source of reference signals; a diode bridge network having a pair of push-pull input ports, a third input port coupled to said summing network output port, and an output port for providing an output signal whenever said input signal frequency and phase vary from said reference signal frequency and phase respectively; and means for coupling said push-pull output ports of said phase splitter to said push-pull input ports of said phase shifter and said diode bridge network, respectively.
Claim 2
Dependent Claim
210 words
A phase discatector circuit functioning as a frequency discriminator circuit for input signals having frequencies removed from a predetermined lock-on frequency and functioning as a phase detector after said predetermined lock-on frequency has been acquired comprising, in combination: a phase splitter having an input port and a pair of push-pull output ports; circuit input means coupled to said input port of said phase splitter; a phase shifter having a pair of push-pull input ports and an output port, the output of said phase shifter having a phase between 0* and 180* depending upon the frequency of said input signal; a summing network having a pair of input ports and an output port, the first input port being coupled to said phase shifter output and a second input port being coupled to a source of reference signals; a diode bridge network having a pair of push-pull input ports, a third input port coupled to said summing network output port, and an output port for providing an output signal whenever said input signal frequency and phase vary from said reference signal frequency and phase respectively; and means for coupling said push-pull output ports of said phase splitter to said push-pull input ports of said phase shifter and said diode bridge network, respectively.
Claim 3
Dependent Claim
49 words
The phase discatector circuit according to claim 1 wherein said phase splitter comprises: a transistor having at least a base, emitter and collector electrodes, and wherein said base electrode is coupled to one of said input ports, and said emitter and collector electrodes are coupled to said phase shifter.
Claim 4
Dependent Claim
29 words
The phase discatector circuit according to claim 2 wherein said phase shifter comprises: a series connected resistor and capacitor coupled to said emitter and collector terminals of said transistor.
Claim 5
Dependent Claim
36 words
The phase discatector circuit according to claim 3 wherein said summing network comprises: first and second resistors in series connection having said source of reference signals coupled to the junction of said first and second resistors.
References Cited (Backward Citations)
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US2901604A
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US2859410A
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US2972065A
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US3205457A
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US3265976A
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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) | 1976-12-03 | 1977-06-04 | 1977-12-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-03 | 1981-06-04 | 1981-12-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-03 | 1985-06-04 | 1985-12-04 | $7700.00 | Window Closed / Lapsed |