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This paper presents a fully integrated Integer-N Phase Locked Loop (INPLL) for ZigBee applications. In this paper the effects of delay in the reset path of Phase and Frequency Detector (PFD) and current gain mismatch in the Charge Pump (CP) on the spectral purity of the Local Oscillator (LO) signal of INPLL is studied theoretically. Then a linearization technique is introduced for a conventional CP...