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• W2021452744 abstract "An all-digital 90° phase shift delay lock loop (DLL) is presented, which is robust against the delay mismatch caused by process variation. Each of the four 90° phase shift blocks accurately aligns its output to a 90° shifted phase using its own ring oscillator and locking delay code. It is analytically proved that the phase shift accuracy of the proposed 90° phase shift block is always higher than that of the conventional all-digital 90° phase shift DLL. The harmonic locking problem is prevented by a ring oscillator and a counter. An area-efficient binary-to-thermometer converter is proposed to reduce the area overhead caused by the delay-line control logic. A fast operating frequency with a finer resolution is achieved through the fine delay range selector and the resistance controlled fine delay unit. The proposed 90° phase shift DLL is implemented using a 45-nm CMOS process. The phase shift accuracy errors at the 90° and 270° phases are 0.43° and 1.01°, respectively, when the maximum locking delay code difference between the four 90° phase shift delay lines corresponds to ±9.97 <sup xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>°</sup> at 800 MHz. It proves that the DLL corrects the significant phase error caused by process variation. The power consumption is 3.3 mW at 800 MHz." @default.
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• W2021452744 date "2012-10-01" @default.
• W2021452744 modified "2023-10-18" @default.
• W2021452744 title "Process Variation Tolerant All-Digital 90$^{circ}$ Phase Shift DLL for DDR3 Interface" @default.
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• W2021452744 doi "https://doi.org/10.1109/tcsi.2012.2188943" @default.
• W2021452744 hasPublicationYear "2012" @default.
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