Abstract
With ever more stringent requirements of cellular standards it is an ongoing challenge to find the optimal RF transmitter architecture. In recent years, the multiphase transmitter (MP TX) architecture has been introduced as a promising candidate. It features high power efficiency and avoids phase modulation which is critical for upconversion of ultra-wideband signals. In this brief, the problem of unwanted spectral emission, inherent in MP TX architectures, is compensated by a proper data delay. Such an approach is considered for the first time in the multiphase architecture and achieves a spectral improvement of up to 38 dB in adjacent channels and 24 dB at the receiver (RX) duplex distance for a new radio (NR) signal with 20 MHz bandwidth. With the proposed solution the MP TX architecture becomes a highly competitive candidate for wideband signals such as LTE, LTE-CA or NR signals. In addition, a detailed and efficient implementation of the digital front-end (DFE) for the MP TX architecture including the proposed data delay is presented.
Highlights
A VOIDING analog signal processing in transmitters for wireless communications results in benefits such as decreased power consumption and good technology scaling
Because of the summation of orthogonal components, the IQ architecture suffers from a maximal power efficiency drop of 3 dB, compared to polar, if a shared RF digital-to-analog converter (RF-DAC) is assumed [8]
The simulated power spectral density (PSD) of the RF signal obtained by the upconversion of an new radio (NR) signal with 20 MHz BW with an
Summary
A VOIDING analog signal processing in transmitters for wireless communications results in benefits such as decreased power consumption and good technology scaling. The digitally-controlled oscillator (DCO) tuning range and nonlinearity within the phase-locked loop (PLL) limit the signal bandwidth (BW) that can be upconverted [3] For this reason, the focus of this work is the multiphase (MP) TX architecture. The focus of this work is to investigate a systematic problem of unwanted OOB spectral emission, neglecting any implementation-related issue, and to propose a solution with significantly improved spectral performance. It will be shown for several different test-cases with signal BW up to 160MHz. a detailed DFE implementation with the proposed concept will be presented
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