A DPLL-Based Phase Modulator Achieving -46dB EVM with A Fast Two-Step DCO Nonlinearity Calibration and Non-Uniform Clock Compensation
Z. Gao (TU Delft - Electronics)
Martin Fritz (Sony Europe B.V.)
J. He (TU Delft - Electronics)
Gerd Spalink (Sony Europe B.V.)
Robert B. Staszewski (TU Delft - Electronics, University College Dublin)
M.S. Alavi (TU Delft - Electronics)
M. Babaie (TU Delft - Electronics)
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Abstract
We present a broadband digital PLL (DPLL)-based phase modulator supporting wide frequency modulation (FM) bandwidth (BW). It compensates for the EVM degradation due to the non-uniform period of the retimed updating clock and shortens the nonlinearity calibration time of the digitally controlled oscillator (DCO) with a phase-domain digital pre-distortion (DPD) and an encoding-assisted (EA)-LMS calibration. While generating a 10MHz 64-PSK signal, the prototype can achieve -46dB EVM with less than one-tenth of the calibration samples (time) required by the prior art.