Patent US4451930A successfully refreshed from Google Patents.
US4451930A
Expired / Lapsed
US
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Phase-locked receiver with derived reference frequency
Assignee: Motorola Solutions Inc
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Filing: 1982-08-02
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Granted: 1984-05-29
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Expires: 2002-08-02
Abstract
Abstract An improved phase locked loop receiver for use in a simulcast transmission system is disclosed whereby the phase locked loop receiver is used as a means to distribute a common reference frequency to all of the transmitters in a simulcast system. By phase locking the link receivers at each of the simulcast transmitters to the carrier of the link transmitter, a common reference is obtained. This allows each of the synthesized simulcast transmitters to be phase locked to a common reference. The Phase Locked Receiver (PLR) uses a reference frequency derived from the receiver IF frequency. The injection oscillator of the receiver is phase locked to this reference.
Inventors
- 👤 Ronald H. Chapman
- 👤 Andrew F. Peterson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 09:11
CPC Classifications
H; H03; H03L; H03L7/00; H03L7/06; H03L7/16; H03L7/18; H03L7/183; H03L7/22; H03L7/23
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
135 words
An improved phase-locked receiver for deriving a reference signal from a received RF carrier signal, including in combination: means for converting the received RF carrier signal into a desired IF frequency; means coupled to said converting means for amplifying said IF frequency; frequency multiplying means coupled to said frequency converting means; first frequency divider means coupled to said amplifying means; phase-locked loop means including phase detector means, low pass filter means and voltage controlled oscillator means and coupled between said frequency multiplying means and said first divider means; said first divider means providing a first input to said phase detector means; and second frequency divider means coupled between said frequency multiplying means and a second input of said phase detector means, whereby, a derived reference signal is provided at a terminal of said phase-locked receiver.
Claim 2
Dependent Claim
135 words
An improved phase-locked receiver for deriving a reference signal from a received RF carrier signal, including in combination: means for converting the received RF carrier signal into a desired IF frequency; means coupled to said converting means for amplifying said IF frequency; frequency multiplying means coupled to said frequency converting means; first frequency divider means coupled to said amplifying means; phase-locked loop means including phase detector means, low pass filter means and voltage controlled oscillator means and coupled between said frequency multiplying means and said first divider means; said first divider means providing a first input to said phase detector means; and second frequency divider means coupled between said frequency multiplying means and a second input of said phase detector means, whereby, a derived reference signal is provided at a terminal of said phase-locked receiver.
Claim 3
Dependent Claim
13 words
The apparatus of claim 1 wherein said phase-locked receiver employs single frequency conversion.
Claim 4
Dependent Claim
16 words
The apparatus of claim 1 wherein said first frequency divider means includes an even integer divider.
Claim 5
Dependent Claim
21 words
The apparatus of claim 3 wherein said even integer divider is disposed in close physical proximity to said IF amplifying means.
Claim 6
Dependent Claim
21 words
The apparatus of claim 1 wherein said derived reference signal is taken from an output of the second frequency divider means.
Claim 7
Dependent Claim
21 words
The apparatus of claim 1 wherein said derived reference signal is taken from an output of said first frequency divider means.
Claim 8
Dependent Claim
167 words
An improved phase-locked receiver for deriving a reference signal from a received carrier signal including in combination: first means for converting a received carrier frequency into a desired first IF frequency; second converting means for converting said first IF frequency into a second IF frequency coupled to said first converting means; IF amplifying means coupled to said second converting means; first phase-locked loop means including phase detector means, low-pass filter means, voltage-controlled oscillator means and first frequency divider means; second frequency divider means coupled to said IF amplifying means; said first phase-locked loop means coupled between said second frequency divider means and said second converting means; frequency multiplier means coupled to said first frequency converting means; second phase-locked loop means including phase detector means, low-pass filter means, voltage-controlled oscillator means and third frequency divider means; and said second phase-locked loop means coupled between said first frequency divider means and said frequency multiplier means, whereby a derived reference signal is provided at a terminal of said phase-locked receiver.
Claim 9
Dependent Claim
167 words
An improved phase-locked receiver for deriving a reference signal from a received carrier signal including in combination: first means for converting a received carrier frequency into a desired first IF frequency; second converting means for converting said first IF frequency into a second IF frequency coupled to said first converting means; IF amplifying means coupled to said second converting means; first phase-locked loop means including phase detector means, low-pass filter means, voltage-controlled oscillator means and first frequency divider means; second frequency divider means coupled to said IF amplifying means; said first phase-locked loop means coupled between said second frequency divider means and said second converting means; frequency multiplier means coupled to said first frequency converting means; second phase-locked loop means including phase detector means, low-pass filter means, voltage-controlled oscillator means and third frequency divider means; and said second phase-locked loop means coupled between said first frequency divider means and said frequency multiplier means, whereby a derived reference signal is provided at a terminal of said phase-locked receiver.
Claim 10
Dependent Claim
19 words
The apparatus of claim 7 wherein a portion of said second frequency divider means is an even integer divider.
Claim 11
Dependent Claim
22 words
The apparatus of claim 8 wherein said even integer divider means is disposed in close physical proximity to said IF amplifying means.
Claim 12
Dependent Claim
20 words
The apparatus of claim 7 wherein said reference signal is derived from an output of said second frequency divider means.
Claim 13
Dependent Claim
26 words
The apparatus of claim 7 wherein said reference signal is derived from an output of said first frequency divider means of said first phase-locked loop means.
Claim 14
Independent Claim
132 words
A method for deriving and outputting a reference signal from a received RF carrier signal, in a phase-locked receiver including the steps of: converting the received RF carrier signal into a desired IF frequency; amplifying said IF frequency; dividing the amplified IF frequency by a predetermined integer controlling a voltage controlled oscillator signal by phase comparing the amplified and divided IF frequency and a first signal and then low-pass filtering the phase comparison result; multiplying up the frequency of the voltage controlled oscillator signal by a predetermined integer to obtain a signal at a desired frequency for performing said converting step; and dividing the frequency of the voltage controlled oscillator signal to provide said first signal; outputting either said amplified and divided IF frequency or said first signal as a reference signal.
Claim 15
Independent Claim
132 words
A method for deriving and outputting a reference signal from a received RF carrier signal, in a phase-locked receiver including the steps of: converting the received RF carrier signal into a desired IF frequency; amplifying said IF frequency; dividing the amplified IF frequency by a predetermined integer controlling a voltage controlled oscillator signal by phase comparing the amplified and divided IF frequency and a first signal and then low-pass filtering the phase comparison result; multiplying up the frequency of the voltage controlled oscillator signal by a predetermined integer to obtain a signal at a desired frequency for performing said converting step; and dividing the frequency of the voltage controlled oscillator signal to provide said first signal; outputting either said amplified and divided IF frequency or said first signal as a reference signal.
Claim 16
Dependent Claim
21 words
The method of claim 12 wherein dividing the amplified IF frequency includes dividing the amplified IF frequency by an even integer.
Claim 17
Dependent Claim
25 words
The method of claim 13 wherein dividing by an even integer is effected at a location in close physical proximity to amplifying said IF frequency.
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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) | 1987-05-29 | 1987-11-28 | 1988-05-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-05-29 | 1991-11-28 | 1992-05-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-05-29 | 1995-11-28 | 1996-05-29 | $7700.00 | Window Closed / Lapsed |