A low voltage W-CDMA polar transmitter with digital envelope path gain compensation

被引：32

作者：

Chen, Jau-Horng ^{[1
]}

Fedorenko, Pavlo ^{[1
]}

Kenney, J. Stevenson ^{[1
]}

机构：

[1] Georgia Inst Technol, Sch Elect & Comp Engn, Atlanta, GA 30332 USA

来源：

IEEE MICROWAVE AND WIRELESS COMPONENTS LETTERS | 2006年 / 16卷 / 07期

关键词：

code division multiple access (CDMA); complementary metal-oxide-semiconductor (CMOS) analog integrated circuit; envelope elimination and restoration (EER); Kahn technique; radio frequency (RF) power;

D O I：

10.1109/LMWC.2006.877127

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：

This letter presents a polar transmitter using a dual-phase pulsewidth-modulated buck converter with a 50-MHz effective switching frequency. Using a wideband code division multiple access voice signal, the overall system can achieve 52.8% drain efficiency (49.8% power added efficiency) at 24-dBm output power at 836.5 MHz with a 3.5-V supply voltage, while passing both adjacent channel leakage power ratio (ACLR1) and alternate channel leakage power (ACLR2) specifications. A digital finite impulse response filter is included in the envelope path to compensate for gain roll-off at higher baseband frequencies. This envelope path compensation allows greater linear bandwidth to be achieved at lower switching frequencies, thus boosting efficiency, and improving ACLR by as much as 8 dB. The polar transmitter is characterized over a supply voltage of 2.5-4.5 V, making it well suited for battery powered, handheld applications.

引用

页码：428 / 430

页数：3

共 7 条

[1] A 233-MHz 80%-87% elfficient four-phase DC-DC converter utilizing air-core inductors on package [J].

Hazucha, P ;

Schrom, G ;

Hahn, J ;

Bloechel, BA ;

Hack, P ;

Dermer, GE ;

Narendra, S ;

Gardner, D ;

Karnik, T ;

De, V ;

Borkar, S .

IEEE JOURNAL OF SOLID-STATE CIRCUITS, 2005, 40 (04) :838-845

[2]

KAHN L, 1952, P IRE JUL, P803

[3]

*MUR CORP, 2006, PROD DOC

[4]

RAAB RH, 1996, IEEE T MICROW THEORY, V44, P2220

[5]

REYNAERT P, 2005, P IEEE SOL STAT CIRC

[6]

Wang FP, 2005, IEEE MTT-S, P645

[7] Design of wide-bandwidth envelope-tracking power amplifiers for OFDM applications [J].

Wang, FP ;

Yang, AHC ;

Kimball, DF ;

Larson, LE ;

Asbeck, PM .

IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES, 2005, 53 (04) :1244-1255

← 1 →