TITLE:
Three-Points Modulator Based on DPLL for Wideband Polar Modulation
AUTHORS:
Julien Kieffer, Sébastien Rieubon, Marc Houdebine, Sébastien Dedieu, Emil Novakov
KEYWORDS:
DPLL; Polar Modulation; WCDMA; TDC
JOURNAL NAME:
Communications and Network,
Vol.5 No.3C,
November
7,
2013
ABSTRACT: We present a nonlinear event-driven model of a Digital PLL used in the context of a polar modulation. This modeling has shown that the estimation method of the TDC gain has a big impact on the EVM for wideband modulation and a solution has been proposed which consists to add the modulation on the gain after calibration of the gain offset. This transforms the classical two-points modulator into a three-points modulator. This implementation has been validated for WCDMA standard.