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A 266–2133 MHz phase shifter is proposed for LPDDR4X interface, utilising an all-digital delay-locked loop (DLL) and a triangular-modulated phase interpolator (PI) to improve the jitter and linearity. The DLL consists of two kinds of DLLs: a global DLL to assist fast locking; and a local DLL which uses an adaptive-window phase detector and a folded delay line to reduce jitter and improve linearity...
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