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학술지 Binary Power Amplifier with 2-Bit Sigma-Delta Modulation Method for EER Transmitter
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저자
임지연, 전상훈, 김경학, 홍성철, 김동욱
발행일
200806
출처
ETRI Journal, v.30 no.3, pp.377-382
ISSN
1225-6463
출판사
한국전자통신연구원 (ETRI)
DOI
https://dx.doi.org/10.4218/etrij.08.0107.0208
협약과제
07MB2500, 유비쿼터스용 CMOS 기반 MEMS 복합센서기술개발, 최창억
초록
A novel power amplifier for a polar transmitter is proposed to achieve better spectral performance for a wideband envelope signal. In the proposed scheme, 2-bit sigma-delta (誇??) modulation of the envelope signal is introduced, and the power amplifier configuration is modified in a binary form to accommodate the 2-bit digitized envelope signals. The 2-bit 誇?? modulator lowers the noise of the envelope signal by fine quantization and thus enhances the spectral property of the RF signal. The Ptolemy simulation results of the proposed structure show that the spectral noise is reduced by 10 dB in a full transmit band of the EDGE system. The dynamic range is also enhanced. Since the performance is improved without increasing the over-sampling ratio, this technique is best suited for wireless communication with high data rates.
키워드
Envelope elimination and restoration (EER), Polar transmitter, Power amplifier, Sigma-delta (EA) modulator
KSP 제안 키워드
EER transmitter, Fine quantization, High data rate, Modulation method, Polar transmitter, RF signals, Sigma-delta modulation, Spectral noise, Spectral properties, dynamic range, envelope elimination and restoration