All-digital fractional-N phase-locked loop structure
A technology of fractional frequency division and phase-locked loop, applied in automatic control of power, electrical components, etc., can solve problems such as high power consumption, poor noise, and complex design, and achieve the goals of reducing effective length, simplifying design, and reducing complexity Effect
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[0043] Below by specific embodiment, and cooperate with accompanying drawing, the present invention will be further described:
[0044] Such as Figure 5 As shown, it is an all-digital fractional frequency-division phase-locked loop structure provided by an embodiment of the present invention. It includes:
[0045] Time-to-digital converter TDC, digital filter DLF, numerically controlled oscillator DCO, numerically controlled phase interpolator DPI, ΣΔ modulator SDM, integer frequency divider DIV and feedforward correction module;
[0046] The TDC is used to convert the phase and output it as a digital signal, and its input terminals input the reference clock and the feedback clock respectively; sample the reference clock according to the rising edge of the feedback clock, and compare the phases of the sampled data to obtain the feedback clock The phase difference between the signal and the reference clock signal, and convert it into a multi-bit digital signal output.
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