Pushing the Linearity Limits of a Digital Polar Transmitter

Conference paper (2018)

Authors

M. Hashemi Electronics - , Signal Processing Systems -

S.M. Alavi Signal Processing Systems - , Electronics -

L.C.N. de Vreede Signal Processing Systems - , Electronics -

Research Group

Electronics () (TU Delft)

Quantization noise DPD Digital polar transmitter RF - DAC Sampling spectral replica

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Published Date

2018

Language

English

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Faculty

Electrical Engineering, Mathematics and Computer Science

Department

Microelectronics

Research Group

Electronics

Abstract

The maximum achievable linearity of a digital polar transmitter (DPTX) is mainly constrained by two RF-DAC associated nonidealities; namely, aliasing of sampling spectral replicas (SSR) of the AM and PM signals, and the presence of nonuniform quantization noise. In this work, using DPTX hardware linearization, in combination with PM SSR filtering and iterative learning control (ILC) algorithm improved by look-up tables (LUT), a CMOS DPTX is linearized close to its theoretical ACPR and EVM limits as predicted by its resolution. Using the ILC technique as underlying basis, an effective real-time direct-learning digital predistortion (DPD) technique is proposed. Measurement results show -60/-53 dBc ACPR and -60/-47 dB EVM using the ILC algorithm for 16/64 MHz OFDM signals, and -55/-48 dBc ACPR and -50/-44 dB EVM using the proposed DPD for 16/64 MHz OFDM signals. To the best of author's knowledge, this is the highest linearity reported for a DPTX operating with wideband signals.

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