Spread spectrum lock phase ring control circuit
A control circuit and phase loop technology, applied in the direction of automatic power control, electrical components, etc., can solve the problems of noise performance deterioration, data transmission errors, etc., and achieve the effect of avoiding data transmission errors
Active Publication Date: 2015-06-03
SHANGHAI BEILING
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[0012] The purpose of the present invention is to solve the shortcomings of existing spread spectrum phase locked loop circuits such as data transmission errors and noise performance deterioration caused by the existence of different clock domains, thereby providing an improved spread spectrum phase locked loop control circuit
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[0047] The composition and working principle of the spread spectrum phase-locked loop control circuit of the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0048] In general, the spread spectrum phase locked loop control circuit of the present invention improves the existing spread spectrum phase locked loop circuit, so that the core modules of data transmission have the same clock domain, that is, the feedback frequency signal generated by the frequency divider Connect the triangular wave generator and modulator, and use it as the clock signal of the two. At the same time, add a calculation unit, which calculates the divisor value and step value according to the feedback frequency signal and the external fixed frequency signal. To the triangular wave generator, thus ensuring the accuracy and stability of the data transmission of the whole system.
[0049] Specifically, such as image 3As shown, th...
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The invention discloses a spread spectrum lock phase ring control circuit, comprising a triangle wave generator, a modulator and a computation unit, wherein a feedback frequency signal is used as a clock signal and is accessed to the triangle wave generator and the modulator; an extra fixed frequency signal and the feedback frequency signal are accessed into the computation unit and the computation unit is connected with the triangle wave generator; and the computation unit calculates a vibration frequency of the feedback frequency signal according to a vibration frequency of the extra fixed frequency signal so as to further determine a divisor value and a step length value to be transmitted to the triangle wave generator. According to the spread spectrum lock phase ring control circuit disclosed by the invention, the problems that two clock domains exist in the existing spread spectrum lock phase ring control circuit so that data transmission is wrong and the like can be avoided.
Description
technical field [0001] The invention relates to a phase-locked loop circuit, more specifically, a spread-spectrum phase-locked loop control circuit that can use spread-spectrum technology for frequency modulation, so that the output frequency can be evenly spread and kept stable. Background technique [0002] like figure 1 As shown, a spread spectrum phase-locked loop circuit (SSPLL) 10 generally includes a phase comparator 11 , a charge pump 12 , a filter 13 , a voltage-controlled oscillator circuit 14 , a frequency divider 15 , a triangle wave generator 16 and a modulator 17 . Among them, the phase comparator 11 compares the reference frequency signal Fref and the feedback frequency signal Fback, and generates an UP / DN signal to control the charging and discharging of the charge pump 12, and the filter 13 is used to filter the output signal of the charge pump 12 to generate a voltage Control the signal Vctrl, thereby changing the oscillation frequency of the voltage-contr...
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IPC IPC(8): H03L7/197H03L7/093
Inventor 郑佳鹏常仲元覃正才肖侃吕回李冠林李长虹张亮
Owner SHANGHAI BEILING