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All-Digital Phase Locked Loop for Bluetooth Low Energy Transmitters

Pereira, P.G. ; Pereira, M. ; Alves, R.M.F. ; Costa, A.M.C. ; Vaz, J. ; Leme, C.A.

All-Digital Phase Locked Loop for Bluetooth Low Energy Transmitters, Proc Conf. on Design of Circuits and Integrated Systems, San Sebastian, Spain, Vol. 1, pp. 1 - 1, November, 2013.

Digital Object Identifier: 0

Abstract
This paper presents a low power ADPLL
architecture in CMOS 130nm for the Bluetooth LE standard. It
uses direct modulation of the Digitally Controlled Oscillator
(DCO), taking advantage of its very low frequency drift. The
ADPLL is opened during the transmission of BLE packets while
the tank capacitance is directly modulated. An algorithm
controlling the loop convergence reduces the locking time. Due to
relaxed BLE requirements the traditional Time-to-Digital
Converter in ADPLL is avoided.