| Presentation | 2012-03-09 A Study on Transversal-Filter Type of Power Amplifier for Applying Switching Operation Transmitter Michiaki KOJIMA, Hironori IZUMI, Yohtaro UMEDA, Osamu TAKYU, |
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| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | A transmitter in wireless communication requires high power-efficiency, high linearity, and low distortion. Envelope pulse width modulation (EPWM) transmitter with Δ-Σ modulation has a lot of attention in recent years to realize them. EPWM enables a high power-efficiency and high linearity by inputting a square pulse to its power amplifier. It also enables a reduction of a quantization noise on a desired signal band by a noise shaping at Δ-Σ modulation. The quantization noise shaped out of the desired signal band is reduced by a RF narrow BPF. However, a favored candidate for this is only a filter using piezoelectric elements which cannot change its center frequency and pass-band width widely at the RF band. This paper proposes the transversal-filter type of a power amplifier where switching operation amplifiers are inserted into each transversal filter tap. It reduces quantization noise and can change both a center frequency by varying its delays and a bandwidth by changing the number of its taps widely. The signal from EPWM with 16QAM is inputted to the amplifier and the outputs of each tap are combined by applying 180 degree hybrids. The performance is evaluated by calculating power efficiency, power spectrum density and constellations after the proposed power amplifier on computer simulation. Finally, it is revealed that the undesired signal power which is caused by the quantization noise is reduced with maintaining the power efficiency at the desired signal band as increasing the proposal amplifier's tap. And as a result of evaluating error vector magnitude (EVM) after quadrature detection, signals are not deteriorated by applying the proposed power amplifier. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | Class E Power Amplifier / EPWM / EVM / 180 degree hybrid / Transversal Filter |
| Paper # | RCS2011-374 |
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| Committee | RCS |
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| Conference Date | 2012/2/29(1days) |
| Place (in Japanese) | (See Japanese page) |
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| Topics (in Japanese) | (See Japanese page) |
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| Registration To | Radio Communication Systems (RCS) |
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| Language | JPN |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | A Study on Transversal-Filter Type of Power Amplifier for Applying Switching Operation Transmitter |
| Sub Title (in English) | |
| Keyword(1) | Class E Power Amplifier |
| Keyword(2) | EPWM |
| Keyword(3) | EVM |
| Keyword(4) | 180 degree hybrid |
| Keyword(5) | Transversal Filter |
| 1st Author's Name | Michiaki KOJIMA |
| 1st Author's Affiliation | Department of Electrical Engineering, Graduate School of Science and Technology, Tokyo University of Science() |
| 2nd Author's Name | Hironori IZUMI |
| 2nd Author's Affiliation | Department of Electrical Engineering, Graduate School of Science and Technology, Tokyo University of Science |
| 3rd Author's Name | Yohtaro UMEDA |
| 3rd Author's Affiliation | Department of Electrical Engineering, Graduate School of Science and Technology, Tokyo University of Science |
| 4th Author's Name | Osamu TAKYU |
| 4th Author's Affiliation | Dept Electrical & Electronic Engineering, Shinshu University |
| Date | 2012-03-09 |
| Paper # | RCS2011-374 |
| Volume (vol) | vol.111 |
| Number (no) | 451 |
| Page | pp.pp.- |
| #Pages | 6 |
| Date of Issue | |