https://scholars.lib.ntu.edu.tw/handle/123456789/631960| Title: | A Dual-Phase Center-Aligned 7-Bit Digital Pulsewidth Modulator for Polar Transmitters | Authors: | Kuo, Chien Hung Yeh, Jian Tzu JAU-HORNG CHEN Chen, Yi Jan Emery |
Keywords: | Envelope elimination and restoration (EER) | mobile communication | power amplifier | pulse-modulated polar transmitter (PMPT) | pulsewidth modulation (PWM) | Issue Date: | 1-Nov-2022 | Publisher: | IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC | Journal Volume: | 70 | Journal Issue: | 11 | Start page/Pages: | 5205 | Source: | IEEE Transactions on Microwave Theory and Techniques | 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. |
URI: | https://scholars.lib.ntu.edu.tw/handle/123456789/631960 | ISSN: | 00189480 | DOI: | 10.1109/TMTT.2022.3205586 |
| Appears in Collections: | 工程科學及海洋工程學系 |
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