NDLI: A <formula formulatype=inline><tex>$DeltaSigma$</tex> </formula>-Digitized Polar RF Transmitter

Content Provider	IEEE Xplore Digital Library
Author	Jinsung Choi Jounghyun Yim Jinho Yang Jingook Kim Jeonghyun Cha Daehyun Kang Dongsu Kim Bumman Kim
Copyright Year	1963
Abstract	This paper demonstrates a new polar transmitter architecture, which uses the digitized envelope signal to control the drain voltage of a switching mode power amplifier (PA). It is based on a novel polar modulation using the constant envelope modulated signal. Among the various constant envelope modulators, the DeltaSigma modulator is chosen for its noise-shaping characteristic. It enables the use of a highly efficient switching amplifier with high linearity. For demonstration, the overall transmitter is implemented and tested with a code-division multiple-access IS-95A signal. The class-D and class-F amplifiers are designed and compared for the optimum operation. The experimental results show that the amplifier with small device size is suitable for this application because of the fast switching requirement. For the class-F amplifier, the measured power-added efficiency is 51.7% at 22.1 dBm and the overall efficiency (considering the amplified quantization noise) is 31%. The adjacent channel power ratios at 885 kHz and 1.98 MHz are lower than -44.9 and -55.6 dBc at the output power range from 10.8 to 22.1 dBm without any pre-distortion techniques. The overall efficiency is improved to 48.6% with a three-level quantized DeltaSigma modulator. The results clearly show that the highly efficient switching mode PA can be controlled efficiently using a digital signal from the DeltaSigma envelope modulation technique.
Sponsorship	IEEE Microwave Theory and Techniques Society
Starting Page	2679
Ending Page	2690
Page Count	12
File Size	2326099
File Format	PDF
ISSN	00189480
Volume Number	55
Issue Number	12
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2007-12-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Delta modulation Power amplifiers Transmitters Voltage control Noise shaping Linearity Testing Multiaccess communication Operational amplifiers Noise measurement $V_{\rm DS}$-to-phase modulation $(V_{\rm DS}/{\rm PM})$ Code division multiple access (CDMA) constant envelope modulator efficiency IS-95A linearity multibit polar modulator power amplifier (PA) RF transmitter sigma–delta
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Electrical and Electronic Engineering Radiation

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