Method and apparatus for frequency independent phase tracking of input signals in receiving systems and the like
First Claim
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1. Apparatus for providing an output signal having phase coherence with the dominant one of a plurality of input signals while tracking the frequency of said dominant input signal, said apparatus comprising:
- input means for receiving said input signals, for producing a first output signal representing the frequency of the dominant input signal of said plurality of input signals, and for producing a replica signal of said dominant input signal; and
phase tracking means, coupled to said input means, for receiving said first output signal and said replica signal for producing a second output signal having phase coherence with said dominant input signal.
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Abstract
The output signal of a phase tracking system maintains phase coherence with the dominant input signal while tracking the frequency of that same dominant input signal without additional phase shifting circuitry. Circuitry having a second phase locked loop is added to a conventional phase locked loop to form a phase tracking system which provides a precisely constant phase shift over a full range of frequencies of the signal captured by the conventional phase locked loop.
251 Citations
21 Claims
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1. Apparatus for providing an output signal having phase coherence with the dominant one of a plurality of input signals while tracking the frequency of said dominant input signal, said apparatus comprising:
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input means for receiving said input signals, for producing a first output signal representing the frequency of the dominant input signal of said plurality of input signals, and for producing a replica signal of said dominant input signal; and phase tracking means, coupled to said input means, for receiving said first output signal and said replica signal for producing a second output signal having phase coherence with said dominant input signal. - View Dependent Claims (2, 3, 4, 16, 17, 21)
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5. Apparatus for recovering an output signal representing a coherent reference signal which is phase coherent with the dominant one of a plurality of input signals for use in carrier demodulation, said apparatus comprising:
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input means having first frequency tracking means for producing a first output signal representing the frequency of the dominant input signal of said plurality of input signals, and for producing a replica signal of said dominant input signal; and phase tracking means having second frequency tracking means, coupled to said input means, for receiving said first output signal and said replica signal, for transmitting said first output signal and for producing a second output signal representing said coherent reference signal having phase coherence with said dominant input signal of said plurality of input signals. - View Dependent Claims (9, 10, 11, 12)
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6. Apparatus for recovering an output signal representing a coherent clock signal which is phase coherent with the dominant one of a plurality of input signals for use in digital systems, said apparatus comprising:
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input means having first frequency tracking means for producing a first output signal representing the frequency of the dominant input signal of said plurality of input signals, and for producing a replica signal of said dominant input signal; and phase tracking means having second frequency tracking means, coupled to said input means, for receiving said first output signal and said replica signal, for transmitting said first output signal and for producing a second output signal representing said coherent clock signal having phase coherence with said dominant input signal of said plurality of input signals.
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7. Apparatus for recovering an output signal representing a coherent signal which is phase coherent with the dominant one of a plurality of input signals for use in frequency synthesizer systems, said apparatus comprising:
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input means having first frequency tracking means for producing a first output signal representing the frequency of the dominant input signal of said plurality of input signals, and for producing a replica signal of said dominant input signal; and phase tracking means having second frequency tracking means, coupled to said input means, for receiving said first output signal and said replica signal, for transmitting said first output signal and for producing a second output signal representing said coherent signal having phase coherence with said dominant input signal of said plurality of input signals.
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8. Apparatus for recovering an output signal comprising the inverse of an input signal which is phase coherent with the dominant one of a plurality of input signals for use in canceling said input signal by forming the simple sum of said inverse signal with said dominant input signal, said apparatus comprising:
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input means having first frequency tracking means for producing a first output signal representing the dominant signal of said plurality of input signals, and for producing a replica signal of said dominant input signal; and phase tracking means having amplifier means, coupled to said input means, for receiving said first output signal and said replica signal to produce a second output signal having phase coherence with said dominant input signal of said plurality of input signals, and for combining said second output signal with said dominant input signal to cancel said dominant input signal. - View Dependent Claims (20)
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13. Apparatus for providing a phase coherent output signal having phase coherence with the input signal to a phase locked loop captured by said input signal, said apparatus comprising:
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replica means for producing a replica signal of said input signal; and phase tracking means having frequency tracking means, coupled to said phase locked loop and to said replica means, for receiving the output signal of said phase locked loop and said replica signal to produce said output signal having phase coherence with said input signal. - View Dependent Claims (14, 15, 18)
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19. Apparatus for providing an output signal having phase coherence with an input signal while tracking the frequency of said input signal, said apparatus comprising:
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input means for receiving said input signal, for producing a first output signal representing the frequency of the input signal and for producing a replica signal of said input signal; phase tracking means, coupled to said input means, for receiving said first output signal and said replica signal for producing a second output signal having phase coherence with said input signal.
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Specification