Linear interval expansion method for rapid frequency locking and cycle slip elimination
A linear interval, frequency locking technology, applied in the field of wireless communication, can solve the problems of slow locking speed, metastability, small gain, etc., to achieve the effect of speeding up the locking process and eliminating the phenomenon of cycle slip
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[0019] Such as figure 1 As shown, the traditional PFDCP has a limited phase detection interval, and a small gain is generated for a large phase deviation, resulting in a slow locking speed.
[0020] Such as figure 2 As shown, in this embodiment, the phase detection interval is divided into multiple linear sub-intervals with a length of 2π. When the phase deviation exceeds ±π, linear expansion is performed, and the PFDCP output represents a constant current of ±2π and the phase detection interval is converted into The opposite phase is used to ensure the correct output current of PFDCP, and PFD ignores the phase error information of ±2π to completely avoid cycle slip.
[0021] Such as image 3 As shown, this embodiment provides the overall structure of the PLL with linear interval extension PFDCP, LE-PFD not only generates the UP / DN signal, but also generates the interval extension signal UP ext and DN ext , the interval expansion counter counts it, and the counting result...
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