A Dual-Phase Center-Aligned 7-Bit Digital Pulsewidth Modulator for Polar Transmitters

Chien Hung Kuo; Jian Tzu Yeh; Jau Horng Chen; Yi Jan Emery Chen

doi:10.1109/TMTT.2022.3205586

A Dual-Phase Center-Aligned 7-Bit Digital Pulsewidth Modulator for Polar Transmitters

Chien Hung Kuo, Jian Tzu Yeh, Jau Horng Chen^*, Yi Jan Emery Chen^*

^*Corresponding author for this work

Department of Electrical Engineering

Research output: Contribution to journal › Article › peer-review

2 Citations (Scopus)

Abstract

This article presents a dual-phase center-aligned 7-bit digital pulsewidth modulator for the envelope modulation of pulse-modulated polar transmitters (PMPTs). The digital pulsewidth modulator operates at a clock frequency and delivers the modulation frequency of 100 MHz. A delay-locked loop (DLL) consisting of 128 delay cells is used to generate the pulse edges for synthesis of center-aligned pulsewidth modulation (PWM) waveforms. The pulsewidth resolution is 78.1 ps. The measurement results show that the integral nonlinearity (INL) and differential nonlinearity (DNL) of the output pulses are within ±0.4 and ±0.3 LSB, respectively, in the duty cycle range of 2.12%-96.51%. Tested with a 20-MHz 256-quadrature-amplitude modulation (QAM) 5G new radio (NR) signal, the transmitter signal using the output of the modulator achieves the adjacent channel leakage ratio (ACLR) of -33.8 dBc.

Original language	English
Pages (from-to)	5205-5212
Number of pages	8
Journal	IEEE Transactions on Microwave Theory and Techniques
Volume	70
Issue number	11
DOIs	https://doi.org/10.1109/TMTT.2022.3205586
Publication status	Published - 2022 Nov 1

Keywords

Envelope elimination and restoration (EER)
mobile communication
power amplifier
pulse-modulated polar transmitter (PMPT)
pulsewidth modulation (PWM)

ASJC Scopus subject areas

Radiation
Condensed Matter Physics
Electrical and Electronic Engineering

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title = "A Dual-Phase Center-Aligned 7-Bit Digital Pulsewidth Modulator for Polar Transmitters",

abstract = "This article presents a dual-phase center-aligned 7-bit digital pulsewidth modulator for the envelope modulation of pulse-modulated polar transmitters (PMPTs). The digital pulsewidth modulator operates at a clock frequency and delivers the modulation frequency of 100 MHz. A delay-locked loop (DLL) consisting of 128 delay cells is used to generate the pulse edges for synthesis of center-aligned pulsewidth modulation (PWM) waveforms. The pulsewidth resolution is 78.1 ps. The measurement results show that the integral nonlinearity (INL) and differential nonlinearity (DNL) of the output pulses are within ±0.4 and ±0.3 LSB, respectively, in the duty cycle range of 2.12%-96.51%. Tested with a 20-MHz 256-quadrature-amplitude modulation (QAM) 5G new radio (NR) signal, the transmitter signal using the output of the modulator achieves the adjacent channel leakage ratio (ACLR) of -33.8 dBc.",

keywords = "Envelope elimination and restoration (EER), mobile communication, power amplifier, pulse-modulated polar transmitter (PMPT), pulsewidth modulation (PWM)",

author = "Kuo, {Chien Hung} and Yeh, {Jian Tzu} and Chen, {Jau Horng} and Chen, {Yi Jan Emery}",

note = "Publisher Copyright: {\textcopyright} 2022 IEEE.",

year = "2022",

month = nov,

day = "1",

doi = "10.1109/TMTT.2022.3205586",

language = "English",

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T1 - A Dual-Phase Center-Aligned 7-Bit Digital Pulsewidth Modulator for Polar Transmitters

AU - Kuo, Chien Hung

AU - Yeh, Jian Tzu

AU - Chen, Jau Horng

AU - Chen, Yi Jan Emery

PY - 2022/11/1

Y1 - 2022/11/1

N2 - This article presents a dual-phase center-aligned 7-bit digital pulsewidth modulator for the envelope modulation of pulse-modulated polar transmitters (PMPTs). The digital pulsewidth modulator operates at a clock frequency and delivers the modulation frequency of 100 MHz. A delay-locked loop (DLL) consisting of 128 delay cells is used to generate the pulse edges for synthesis of center-aligned pulsewidth modulation (PWM) waveforms. The pulsewidth resolution is 78.1 ps. The measurement results show that the integral nonlinearity (INL) and differential nonlinearity (DNL) of the output pulses are within ±0.4 and ±0.3 LSB, respectively, in the duty cycle range of 2.12%-96.51%. Tested with a 20-MHz 256-quadrature-amplitude modulation (QAM) 5G new radio (NR) signal, the transmitter signal using the output of the modulator achieves the adjacent channel leakage ratio (ACLR) of -33.8 dBc.

AB - This article presents a dual-phase center-aligned 7-bit digital pulsewidth modulator for the envelope modulation of pulse-modulated polar transmitters (PMPTs). The digital pulsewidth modulator operates at a clock frequency and delivers the modulation frequency of 100 MHz. A delay-locked loop (DLL) consisting of 128 delay cells is used to generate the pulse edges for synthesis of center-aligned pulsewidth modulation (PWM) waveforms. The pulsewidth resolution is 78.1 ps. The measurement results show that the integral nonlinearity (INL) and differential nonlinearity (DNL) of the output pulses are within ±0.4 and ±0.3 LSB, respectively, in the duty cycle range of 2.12%-96.51%. Tested with a 20-MHz 256-quadrature-amplitude modulation (QAM) 5G new radio (NR) signal, the transmitter signal using the output of the modulator achieves the adjacent channel leakage ratio (ACLR) of -33.8 dBc.

KW - Envelope elimination and restoration (EER)

KW - mobile communication

KW - power amplifier

KW - pulse-modulated polar transmitter (PMPT)

KW - pulsewidth modulation (PWM)

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A Dual-Phase Center-Aligned 7-Bit Digital Pulsewidth Modulator for Polar Transmitters

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Keywords

ASJC Scopus subject areas

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