Abstract
A polar transmitter using a new linear-assisted delta-modulation (LADM) envelope-amplifier has been developed for WCDMA applications. 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-μm 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 pre-distortion technique. The developed polar transmitter nearly doubles the average efficiency in the 10- to 15-dB back-off region of class-AB PAs.
| Original language | English |
|---|---|
| Title of host publication | Proceedings of the 36th European Microwave Conference, EuMC 2006 |
| Pages | 137-140 |
| Number of pages | 4 |
| DOIs | |
| Publication status | Published - 2007 |
| Externally published | Yes |
| Event | 36th European Microwave Conference, EuMC 2006 - Manchester Duration: 2006 Sep 10 → 2006 Sep 12 |
Other
| Other | 36th European Microwave Conference, EuMC 2006 |
|---|---|
| City | Manchester |
| Period | 06/9/10 → 06/9/12 |
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Keywords
- CMOS
- Code division multiple access (CDMA)
- Delta modulation
- Polar transmitter
- Power amplifiers
ASJC Scopus subject areas
- Electrical and Electronic Engineering
- Condensed Matter Physics
- Radiation
Cite this
A polar transmitter using a linear-assisted delta-modulation envelope-amplifier for WCDMA applications. / Kunihiro, Kazuaki; Takahashi, Kiyohiko; Yamanouchi, Shingo; Hirayama, Tomohisa; Hida, Hikaru; Tanaka, Shinichi.
Proceedings of the 36th European Microwave Conference, EuMC 2006. 2007. p. 137-140 4057766.Research output: Chapter in Book/Report/Conference proceeding › Conference contribution
}
TY - GEN
T1 - A polar transmitter using a linear-assisted delta-modulation envelope-amplifier for WCDMA applications
AU - Kunihiro, Kazuaki
AU - Takahashi, Kiyohiko
AU - Yamanouchi, Shingo
AU - Hirayama, Tomohisa
AU - Hida, Hikaru
AU - Tanaka, Shinichi
PY - 2007
Y1 - 2007
N2 - A polar transmitter using a new linear-assisted delta-modulation (LADM) envelope-amplifier has been developed for WCDMA applications. 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-μm 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 pre-distortion technique. The developed polar transmitter nearly doubles the average efficiency in the 10- to 15-dB back-off region of class-AB PAs.
AB - A polar transmitter using a new linear-assisted delta-modulation (LADM) envelope-amplifier has been developed for WCDMA applications. 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-μm 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 pre-distortion technique. The developed polar transmitter nearly doubles the average efficiency in the 10- to 15-dB back-off region of class-AB PAs.
KW - CMOS
KW - Code division multiple access (CDMA)
KW - Delta modulation
KW - Polar transmitter
KW - Power amplifiers
UR - http://www.scopus.com/inward/record.url?scp=41649110645&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=41649110645&partnerID=8YFLogxK
U2 - 10.1109/EUMC.2006.281219
DO - 10.1109/EUMC.2006.281219
M3 - Conference contribution
AN - SCOPUS:41649110645
SN - 2960055160
SN - 9782960055160
SP - 137
EP - 140
BT - Proceedings of the 36th European Microwave Conference, EuMC 2006
ER -