| 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) |
| 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 |
| Download PDF |
|
| 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) |
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| Keyword(7) |
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| 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) |
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| 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) |