Apparatus for providing system clock synchronized to a network universally
First Claim
1. An apparatus for generating a system clock in synchronization with a network, comprising:
- a network synchronization reference signal generator receiving at least one reference signal from a communications network, selecting one of the received reference signal, frequency-dividing the selected reference signal, and outputting a reference signal for network synchronization;
a network synchronization controller receiving the reference signal for network synchronization and a first clock pulse, and generating a first control voltage that allows the first clock pulse to be in synchronization with the reference signal for network synchronization;
an ovenized voltage-controlled crystal oscillator (OVCXO) generating the first clock pulse whose phase and frequency are changed by application of the first control voltage;
a system synchronization reference signal generator receiving the first clock pulse, frequency-dividing the first clock pulse, and generating different reference signals for system synchronization according to types of systems, the reference signal for system synchronization being used for synchronizing the system clock;
a system synchronization controller receiving the reference signal for system synchronization and the system clock, and generating a second control voltage that allows the system clock to be in synchronization with the reference signal for system synchronization;
a voltage-controlled oscillator (VCO) generating a second clock pulse whose phase and frequency are changed by application of the second control voltage; and
a system clock generator receiving the second clock pulse, frequency-dividing the second clock pulse, and outputting the system clock.
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Accused Products
Abstract
Provided is an apparatus for providing a system clock synchronized to a network universally. The apparatus includes a network synchronization reference signal generating unit that outputs a reference signal for network synchronization; a network synchronization controller that generates a first control voltage that allows a first clock pulse to be in synchronization with the reference signal for network synchronization; an OVCXO that generates the first clock pulse by application of the first control voltage; a system synchronization reference signal generator that generates reference signals for system synchronization; a system synchronization controller that generates a second control voltage that allows the system clock to be in synchronization with the reference signal for system synchronization; a VCO that generates a second clock pulse by application of the second control voltage; and a system clock generator that outputs the system clock. Accordingly, it is possible to apply to systems requiring network synchronization.
13 Citations
5 Claims
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1. An apparatus for generating a system clock in synchronization with a network, comprising:
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a network synchronization reference signal generator receiving at least one reference signal from a communications network, selecting one of the received reference signal, frequency-dividing the selected reference signal, and outputting a reference signal for network synchronization;
a network synchronization controller receiving the reference signal for network synchronization and a first clock pulse, and generating a first control voltage that allows the first clock pulse to be in synchronization with the reference signal for network synchronization;
an ovenized voltage-controlled crystal oscillator (OVCXO) generating the first clock pulse whose phase and frequency are changed by application of the first control voltage;
a system synchronization reference signal generator receiving the first clock pulse, frequency-dividing the first clock pulse, and generating different reference signals for system synchronization according to types of systems, the reference signal for system synchronization being used for synchronizing the system clock;
a system synchronization controller receiving the reference signal for system synchronization and the system clock, and generating a second control voltage that allows the system clock to be in synchronization with the reference signal for system synchronization;
a voltage-controlled oscillator (VCO) generating a second clock pulse whose phase and frequency are changed by application of the second control voltage; and
a system clock generator receiving the second clock pulse, frequency-dividing the second clock pulse, and outputting the system clock. - View Dependent Claims (2, 3, 4, 5)
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Specification