INJECTION LOCKED PHASE LOCK LOOPS
First Claim
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1. A signal generating circuit for generating an output signal comprising:
- a phase detection circuit, arranged to detect a phase difference between an input reference signal and a feedback signal, and generate a control signal according to the phase difference; and
an injected controlled oscillator, arranged to receive the control signal and an injection signal, and generate the output signal according to the control signal and the injection signal, wherein a frequency of the output signal is proportional to a frequency of the input reference signal, and a frequency of the injection signal does not equal to the frequency of the output signal.
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Abstract
A signal generating circuit for generating an output signal is provided. A phase detection circuit is arranged to detect a phase difference between an input reference signal and a feedback signal, and generate a control signal according to the phase difference. An injected controlled oscillator is arranged to receive the control signal and an injection signal and generate the output signal according to the control signal and the injection signal. A frequency of the output signal is proportional to a frequency of the input reference signal, and a frequency of the injection signal does not equal to the frequency of the output signal.
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Citations
25 Claims
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1. A signal generating circuit for generating an output signal comprising:
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a phase detection circuit, arranged to detect a phase difference between an input reference signal and a feedback signal, and generate a control signal according to the phase difference; and an injected controlled oscillator, arranged to receive the control signal and an injection signal, and generate the output signal according to the control signal and the injection signal, wherein a frequency of the output signal is proportional to a frequency of the input reference signal, and a frequency of the injection signal does not equal to the frequency of the output signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A signal generating circuit for generating an output signal comprising:
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a first phase detection circuit, arranged to detect a phase difference between a first input reference signal and a first feedback signal, and generate a first control signal according to the phase difference; a second phase detection circuit, arranged to detect a phase difference between a second input reference signal and a second feedback signal, and generate a second control signal according to the phase difference; a first injected controlled oscillator, coupled between the first phase detection circuit and the second phase detection circuit and arranged to receive the first control signal and a first injection signal, and generate a first output signal according to the first control signal and the first injection signal, wherein a frequency of the first output signal is proportional to a frequency of the first input reference signal, and a frequency of the first injection signal does not equal to the frequency of the first output signal; and a second injected controlled oscillator, coupled to the second phase detection circuit and arranged to receive the second control signal and a second injection signal, and generate a second output signal as the output signal according to the second control signal and the second injection signal, wherein the second input reference signal is one of the first input reference signal or the first output signal, a frequency of the second output signal is larger than and proportional to a frequency of the second input reference signal, and a frequency of the second injection signal does not equal to the frequency of second first output signal. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. A signal generating circuit for generating a high frequency output signal according to an input reference signal comprising:
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a first stage of circuit, comprising; a first phase locked loop, arranged to detect a phase difference between the input reference signal and a first feedback signal to generate a first control signal and comprising a first injected controlled oscillator, arranged to generate a first output signal according to the first control signal and a first injection signal, wherein the first feedback signal is generated according to the first output signal and a frequency of the first output signal is an integer multiple of a frequency of the first feedback signal; and a first injection signal generating circuit, coupled to the first injected controlled oscillator and generating the first injection signal according to a first injection reference signal, wherein an oscillation frequency of the first injected controlled oscillator is larger than and is an integer multiple of a frequency of the first injection signal; and a second stage of circuit, coupled to the first stage of circuit and comprising a plurality of stages of cascaded phase locked loops and a plurality of stages of the injection signal generating circuits each corresponding to one of the phase locked loops, wherein each stage of the injection signal generating circuit is coupled to an injected controlled oscillator of the corresponding phase locked loop and generates an injection signal to the corresponding injected controlled oscillator, and the second stage of circuit outputs an output signal at the last stage of the injected controlled oscillator as the high frequency output signal, and wherein an oscillation frequency of each stage of injected controlled oscillator is larger than and is an integer multiple of a frequency of the injection signal generated by the corresponding injection signal generating circuit. - View Dependent Claims (24, 25)
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Specification