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System and method for detecting phase lock in phase locked loop

A phase-locked loop and phase-locked technology, which is applied in the field of detection of phase-locked systems in phase-locked loops, can solve problems such as difficulty in rapid tracking, weakened ability to prevent frequency jitter, easy loss of phase-locked state, etc.

Inactive Publication Date: 2003-02-05
SAMSUNG ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the ability to prevent frequency jitter is weakened
On the other hand, conversely, when the bandwidth is narrow, it is very difficult to track quickly, and the phase-locked state is easily lost

Method used

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  • System and method for detecting phase lock in phase locked loop
  • System and method for detecting phase lock in phase locked loop
  • System and method for detecting phase lock in phase locked loop

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Embodiment Construction

[0024] figure 2 is a block diagram of a phase lock detection system for a PLL according to the present invention. The phase detector 200 is used to change the reference frequency (F ref ) is compared with the phase of the feedback oscillation frequency to generate a high / low signal. The multiple detection circuit 207 is used to selectively perform the charging and discharging process according to the high / low signal generated from the phase detector 200 . After these processes, until the voltage is at the reference frequency (F ref ) until four times the voltage, the comparison is performed to obtain a value. Thereafter, according to the reference frequency (F ref ) to control this value to generate a locked information signal with a length of N bits. The current controller 208 determines the input current of the excitation according to the information signal received from the multiple detection circuit to output through the output terminal 205 . Charge actuator 201 reg...

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Abstract

A system and method for detecting phase lock in a phase locked loop, which determines the phase of the oscillation frequency by detecting the phase of the voltage controlled oscillator frequency, the system includes multiple detection circuits, by comparing said input reference frequency and said feedback The phase difference of the oscillation frequency to obtain a logic high / low signal, which is used to selectively charge and discharge during the high / low interval, when the voltage is at K times the reference frequency, compare the set reference frequency, and then pass The value obtained by dividing the reference frequency by 4 is increased or decreased to generate a locked information signal having a length of N bits, and a current controller is included to determine the input current of the charging actuator according to the information signal.

Description

technical field [0001] The present invention relates to a system for detecting phase-locking in a phase-locked loop, which determines the phase of the oscillation frequency by detecting the phase of the frequency of a voltage-controlled oscillator, and more particularly relates to its detection method, wherein, according to the input reference frequency and the oscillation The phase difference of the frequency adjusts the bandwidth in multiple steps to keep the oscillation frequency exactly in phase with the input reference frequency. Background technique [0002] Usually, the PLL system is a feedback loop, which is used to extract the baseband signal from the carrier frequency. The PLL system basically includes a phase detector and a voltage-controlled oscillator, which compares the input carrier signal with the output of the voltage-controlled oscillator. Comparing the phase difference, using the phase difference to control the frequency of the v...

Claims

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Application Information

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IPC IPC(8): H03L7/085H03L7/00H03L7/08H03L7/089H03L7/093H03L7/095H03L7/107
CPCH03L7/095H03L7/107H03L7/0898H03L7/1072H03L7/00H03L7/08
Inventor 南哲A·N·科冈诺夫
Owner SAMSUNG ELECTRONICS CO LTD
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