Adaptive Two-Point Modulation of Wireless Phase Locked Loops

Ballantyne, Gary J.; Sun, Bo

doi:10.1109/tcst.2011.2129592

Cited by 4 publications

(1 citation statement)

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“…An efficient implementation results by only taking the sign information into account. The presented approach basically combines the method of steepest descent based on data and error sign of [15] and the model reference adaptive control approach shown in [16].…”

Section: Dco Gain Estimationmentioning

confidence: 99%

A Highly Reconfigurable RF-DPLL Phase Modulator for Polar Transmitters in Cellular RFICs

Buckel¹,

Tertinek

Mayer

et al. 2018

IEEE Trans. Microwave Theory Techn.

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A multirate fractional-N RF digital phase-locked loop (DPLL) phase modulator implementation for polar transmitter supporting cellular communication standards up to 4G LTE-A is demonstrated. The RF-DPLL integrates LC-tank-based digitalcontrolled oscillator (DCO) cores with --noise shaping and fractional sample rate conversion to account for a broad range of frequency bands and spectral emission requirements. A twopoint modulation with different sampling rates and signal scaling is applied to optimize the system for operation in narrow-band and wide-band phase modulation. DCO digital predistortion and DCO gain estimation in combination with open-loop gain auto adjustment and delay calibration are implemented to achieve sufficiently low-in-band distortion. Measurement results of the RF-DPLL system as part of a polar transmitter implemented in 28-nm CMOS are shown, fulfilling 3GPP specifications for 4G, LTE-A uplink and legacy cellular communication standards like 3G, UMTS/HSPA+ and 2G, GSM/EDGE.

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Section: Dco Gain Estimationmentioning

confidence: 99%