A Low-Current Digitally Predistorted Direct-Conversion Transmitter With 25% Duty-Cycle Passive Mixer

被引：10

作者：

Collados, Manel ^{[1
]}

Zhang, HongLi ^{[2
]}

Tenbroek, Bernard ^{[1
]}

Chang, Hsiang-Hui ^{[3
]}

机构：

[1] MTK Wireless Ltd, W Malling ME19 4AD, England

[2] MediaTek Singapore Pte Ltd, Singapore 138628, Singapore

[3] MediaTek Inc, Hsinchu 30078, Taiwan

来源：

IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES | 2014年 / 62卷 / 04期

关键词：

CMOS; digital; driver; harmonic; linearity; longterm evolution (LTE); mixer; modulator; nonlinear; passive; predistortion; transmitter (TX); WCDMA; POWER;

D O I：

10.1109/TMTT.2014.2309559

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

A low-current direct-conversion transmitter (TX) is obtained by combining an efficient single-balanced 25% duty-cycle passive mixer with a low-bias single-ended driver. The nonlinearity of such architecture is aggravated by strong harmonics at the mixer output folding down to the fundamental frequency due to driver nonlinearity. To address this, a baseband mathematical model of the passive mixer plus nonlinear driver is derived. Then, based on this model, a novel digital-predistortion approach is disclosed. Implemented in 40-nm CMOS, the modulator and driver combined consume 45 mW when delivering a +3-dBm Release 99 WCDMA signal with 0.9% error vector magnitude (EVM) and -59-dBc adjacent-channel leakage power ratio (ACLR). In long-term evolution (LTE) mode, the TX delivers +0-dBm 10-MHz LTE 16QAM with -53-dBc ACLR and 1.2% EVM.

引用

页码：726 / 731

页数：6

共 14 条

[11] Orthogonal polynomials for power amplifier modeling and predistorter design [J].

Raich, R ;

Qian, H ;

Zhou, GT .

IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY, 2004, 53 (05) :1468-1479

[12] On the modeling of memory nonlinear effects of power amplifiers for communication applications [J].

Raich, R ;

Zhou, GT .

PROCEEDINGS OF THE 2002 IEEE 10TH DIGITAL SIGNAL PROCESSING WORKSHOP & 2ND SIGNAL PROCESSING EDUCATION WORKSHOP, 2002, :7-10

[13]

Rossi P, 2013, ISSCC DIG TECH PAP I, V56, P340, DOI 10.1109/ISSCC.2013.6487761

[14]

Youssef M., 2011, 2011 IEEE International Solid-State Circuits Conference (ISSCC 2011), P378, DOI 10.1109/ISSCC.2011.5746362

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