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Three-Points Modulator Based on DPLL for Wideband Polar Modulation

DOI: 10.4236/cn.2013.53B2027, PP. 140-143

Keywords: DPLL, Polar Modulation, WCDMA, TDC

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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.

References

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