| IEICE Technical Committee Submission System Conference Paper's Information |
Online Proceedings [Sign in] Tech. Rep. Archives |
| Go Top Page | Go Previous | [Japanese] / [English] |
| Paper Abstract and Keywords | ||
| Presentation | 2007-03-09 13:00 [Invited Talk] Circuit design of highly linear and efficient power amplifiers for WCDMA applications -- Dynamic predistortion and polar modulation technologies -- Kazuaki Kunihiro, Shingo Yamanouchi, Kiyohiko Takahashi, Yuuichi Aoki (NEC) Link to ES Tech. Rep. Archives:  MW2006-193 |
|
| Abstract | (in Japanese) | (See Japanese page) |
| (in English) | This paper presents linearization and efficiency-enhancement techniques, i.e., dynamic predistortion (PD) and polar modulation, for WCDMA handset power amplifiers (PAs). The dynamic-PD was designed to compress dynamic-gain of a driver-stage PA at base-band frequency; this compensates for expanded gain of an output-stage PA, resulting in flat dynamic-gain in total. It is shown that compressing dynamic-gain is equivalent to generating anti-phase inter-modulation-distortion (IMD3) which cancels out in-phase IMD3 of the output-stage PA, thus minimizing total IMD3. The fabricated two-stage InGaP/GaAs HBT PA with the dynamic PD exhibited an ACPR of -40 dBc and a PAE of 50% at an average output power of 26.8 dBm with an extremely low quiescent current of 20 mA. A polar-modulation PA using a new linear-assisted delta-modulation (LADM) envelope-amplifier is also described. The LADM system is composed of a highly efficient switching block based on a 200-MHz-clock delta-modulator, which is implemented in a 0.18-m CMOS IC, and a highly accurate linear block. In the LADM approach, the residual quantization noise and distortion of switching amplification are removed through the assistant linear process; thus, a sufficiently low ACPR of -45 dBc and a small EVM of 1.7% can be achieved without a predistortion technique. The developed polar transmitter nearly doubles the average efficiency in the 10- to 15-dB back-off region of class-AB PAs. | |
| Keyword | (in Japanese) | (See Japanese page) |
| (in English) | power amplifier / code division multiple access / predistortion / polar modulation / delta modulation / / / | |
| Reference Info. | IEICE Tech. Rep., vol. 106, no. 560, MW2006-193, pp. 1-6, March 2007. | |
| Paper # | MW2006-193 | |
| Date of Issue | 2007-03-02 (MW) | |
| ISSN | Print edition: ISSN 0913-5685 | |
| Copyright and reproduction |
All rights are reserved and no part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopy, recording, or any information storage and retrieval system, without permission in writing from the publisher. Notwithstanding, instructors are permitted to photocopy isolated articles for noncommercial classroom use without fee. (License No.: 10GA0019/12GB0052/13GB0056/17GB0034/18GB0034) | |
| Download PDF | Link to ES Tech. Rep. Archives: MW2006-193 |
|
| Conference Information | |
| Committee | RCS MoNA WBS SR MW |
| Conference Date | 2007-03-07 - 2007-03-09 |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | YRP |
| Topics (in Japanese) | (See Japanese page) |
| Topics (in English) | |
| Paper Information | |
| Registration To | MW |
| Conference Code | 2007-03-RCS-MoMuC-WBS-SR-MW |
| Language | Japanese |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | Circuit design of highly linear and efficient power amplifiers for WCDMA applications |
| Sub Title (in English) | Dynamic predistortion and polar modulation technologies |
| Keyword(1) | power amplifier |
| Keyword(2) | code division multiple access |
| Keyword(3) | predistortion |
| Keyword(4) | polar modulation |
| Keyword(5) | delta modulation |
| Keyword(6) | |
| Keyword(7) | |
| Keyword(8) | |
| 1st Author's Name | Kazuaki Kunihiro |
| 1st Author's Affiliation | NEC (NEC) |
| 2nd Author's Name | Shingo Yamanouchi |
| 2nd Author's Affiliation | NEC (NEC) |
| 3rd Author's Name | Kiyohiko Takahashi |
| 3rd Author's Affiliation | NEC (NEC) |
| 4th Author's Name | Yuuichi Aoki |
| 4th Author's Affiliation | NEC (NEC) |
| 5th Author's Name | |
| 5th Author's Affiliation | () |
| 6th Author's Name | |
| 6th Author's Affiliation | () |
| 7th Author's Name | |
| 7th Author's Affiliation | () |
| 8th Author's Name | |
| 8th Author's Affiliation | () |
| 9th Author's Name | |
| 9th Author's Affiliation | () |
| 10th Author's Name | |
| 10th Author's Affiliation | () |
| 11th Author's Name | |
| 11th Author's Affiliation | () |
| 12th Author's Name | |
| 12th Author's Affiliation | () |
| 13th Author's Name | |
| 13th Author's Affiliation | () |
| 14th Author's Name | |
| 14th Author's Affiliation | () |
| 15th Author's Name | |
| 15th Author's Affiliation | () |
| 16th Author's Name | |
| 16th Author's Affiliation | () |
| 17th Author's Name | |
| 17th Author's Affiliation | () |
| 18th Author's Name | |
| 18th Author's Affiliation | () |
| Speaker | Author-1 |
| Date Time | 2007-03-09 13:00:00 |
| Presentation Time | 30 minutes |
| Registration for | MW |
| Paper # | MW2006-193 |
| Volume (vol) | vol.106 |
| Number (no) | no.560 |
| Page | pp.1-6 |
| #Pages | 6 |
| Date of Issue | 2007-03-02 (MW) |
[Return to Top Page]