A Configurable Lock-Detect Circuit for Charge-Pump Phase-Locked Loops
A lock detection and phase-locked loop technology, applied in the direction of electrical components, automatic power control, etc., can solve the problems affecting the normal operation of integrated circuit systems, lock detection circuit failure, etc., to improve flexibility and reliability, improve reliability , the effect of improving flexibility
Active Publication Date: 2022-03-15
BEIJING MXTRONICS CORP +1
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Problems solved by technology
At present, the charge pump phase-locked loop is mostly used as a wide frequency frequency synthesizer, and may need to work in a complex environment
In this case, the traditional non-configurable lock detection circuit may fail, affecting the normal operation of the integrated circuit system
Method used
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[0031] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0032] figure 1 Shown is a schematic diagram of the overall structure of a typical charge pump phase-locked loop. The charge pump phase locked loop consists of input frequency divider B101, frequency and phase detector B102, charge pump B103, loop filter B104, voltage controlled oscillator B105, output frequency divider B106, feedback frequency divider B107 and lock detection circuit Composition of B108.
[0033] The locking detection circuit B108 of the present invention simultaneously receives the output clock CLKIN of the input frequency divider B101 and the output clock CLKFB of the feedback frequency divider B107, and judges whether the phase-locked loop is locked according to the detection conditions set by the three groups of control signals DSEL, CSEL1 and CSEL2 . Its circuit structure is as figure 2 As shown, including: ...
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The present invention provides a configurable lock detection circuit suitable for a phase-locked loop of a charge pump, including a clock phase difference comparison circuit, a lock counter B203, an out-of-lock counter B204, an SR latch SR251, a clock phase difference comparison circuit, and a receiving pair Compare the phase difference between the two externally input clock signals. When the absolute value of the phase difference is less than or equal to the time window length, enable the lock counter B203, reset and disable the lock-out counter B204; otherwise, enable the lock-out counter B204, reset and disable it The locked counter B203; the output terminals of the locked counter B203 and the unlocked counter B204 are connected to the R terminal and the S terminal of the SR latch SR251, and the output terminal of the SR latch SR251 is a lock indication signal of a configurable lock detection circuit. The circuit can reduce the probability of "false loss of lock" and improve the reliability of the lock detection circuit.
Description
technical field [0001] The invention relates to a configurable locking detection circuit suitable for a phase-locked loop of a charge pump, belonging to the technical field of integrated circuits. Background technique [0002] Phase-locked loop is a frequency and phase synchronization technology realized by feedback control principle, which can provide low-noise clock signal, and has been widely used in wireless communication, navigation, computer and other fields. The charge pump phase-locked loop is a typical representative of the digital-analog hybrid phase-locked loop. Its theoretical static phase error is zero, and it has significant advantages such as high speed, low jitter, and low power consumption. It is currently the most widely used phase-locked loop. The basic structure of the charge pump phase-locked loop is as follows: figure 1 shown. [0003] The lock detection circuit is an important module in the phase-locked loop of the charge pump, which is used to detec...
Claims
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IPC IPC(8): H03L7/095
CPCH03L7/095
Inventor 杨铭谦陈雷王科迪张健李智李学武张彦龙
Owner BEIJING MXTRONICS CORP