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

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


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 languageEnglish
Pages (from-to)5205-5212
Number of pages8
JournalIEEE Transactions on Microwave Theory and Techniques
Issue number11
Publication statusPublished - 2022 Nov 1


  • 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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