A New AM Transmitter using Digital Phase Shifting.
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- Hayeiwa Kazuhisa
- Engineering Administration Department, NHK
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- Yamazoe Masahiko
- Engineering Administration Department, NHK
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- Naka Hisashi
- Engineering Administration Department, NHK
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- Minami Michitoshi
- System Electronics Division, Japan Radio Corporation
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- Kojima Yutaka
- System Electronics Division, Japan Radio Corporation
Bibliographic Information
- Other Title
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- ディジタル位相シフトを利用した新型ＡＭ送信機
- ディジタル イソウ シフト オ リヨウシタ シンガタ AM ソウシンキ
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Abstract
This paper presents a new type of AM transmitter which can produce AM waves directly from digitized audio signals by shifting the phase of the signals digitally using a frequency twelve times as high as the carrier. The transmitter consists of six switching-type RF power amplifiers with a maximum peak output power of 330 W, a 12-bit A/D converter, a ROM for waveform compensation (arc sin etc.), phase shifters/selectors for producing carrier pulse width signals, and a power combiner. The transmitter displays high overall efficiency of 67% (RF output/DC input), an SN ratio of 68 dB, and about 0.9% total harmonic distortion at 80% modulation.
Journal
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- The Journal of the Institute of Television Engineers of Japan
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The Journal of the Institute of Television Engineers of Japan 50 (7), 943-949, 1996
The Institute of Image Information and Television Engineers
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Details 詳細情報について
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- CRID
- 1390282680042492032
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- NII Article ID
- 110003673949
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- NII Book ID
- AN00151466
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- ISSN
- 18849652
- 03866831
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- NDL BIB ID
- 4003350
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- Text Lang
- ja
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- Data Source
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- JaLC
- NDL
- Crossref
- CiNii Articles
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- Abstract License Flag
- Disallowed