| Presentation | 2012-10-18 A Novel 1-bit Feedforward Distorted Compensation for Bandpass ΔΣ Modulation Takashi MAEHATA, Kazuyuki TOTANI, Suguru KAMEDA, Noriharu SUEMATSU, |
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| PDF Download Page |  PDF download Page Link |
| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | We propose a novel 1-bit feedforward distorted compensation technology in a direct radio frequency converter (DRFC) which is a kind of RF transmitter using bandpass delta-sigma modulation (BP-DSM). BP-DSM efficiently performs high resolution data conversion using oversampling. It can directly output a RF signal from baseband using 1-bit digital pulse train with a rectangular waveform and but, recently related works reported that an adjacent channel leakage ratio (ACLR) deteriorates when this waveform is off an ideal waveform. Proposal method in this paper can compensate this ACLR and be performed by using a distorted compensation signal with a 1-bit digital pulse train. Therefore this novel method does not need an analog RF circuit for compensation. In simulation, a theoretical approach of proposal method leads to high ACLR 60dB to compensate this distortion even if two kinds of signals are distorted independently. We measured that the proposed method compensates ACLR from 46dB to 50dB in a developed prototype. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | Bandpass / delta-sigma modulator / feedforward compensation / D/A converter |
| Paper # | RCS2012-143,SR2012-63,AN2012-37,USN2012-40 |
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| Conference Information | |
| Committee | USN |
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| Conference Date | 2012/10/10(1days) |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | |
| Topics (in Japanese) | (See Japanese page) |
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| Paper Information | |
| Registration To | Ubiquitous and Sensor Networks(USN) |
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| Language | JPN |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | A Novel 1-bit Feedforward Distorted Compensation for Bandpass ΔΣ Modulation |
| Sub Title (in English) | |
| Keyword(1) | Bandpass |
| Keyword(2) | delta-sigma modulator |
| Keyword(3) | feedforward compensation |
| Keyword(4) | D/A converter |
| 1st Author's Name | Takashi MAEHATA |
| 1st Author's Affiliation | Information & Communication Laboratories, Sumitomo Electric Industries, Ltd() |
| 2nd Author's Name | Kazuyuki TOTANI |
| 2nd Author's Affiliation | Information & Communication Laboratories, Sumitomo Electric Industries, Ltd |
| 3rd Author's Name | Suguru KAMEDA |
| 3rd Author's Affiliation | Research Institute of Electrical Communication, Tohoku University |
| 4th Author's Name | Noriharu SUEMATSU |
| 4th Author's Affiliation | Research Institute of Electrical Communication, Tohoku University |
| Date | 2012-10-18 |
| Paper # | RCS2012-143,SR2012-63,AN2012-37,USN2012-40 |
| Volume (vol) | vol.112 |
| Number (no) | 242 |
| Page | pp.pp.- |
| #Pages | 8 |
| Date of Issue | |