Title:
TRANSMITTING CIRCUIT
Document Type and Number:
Japanese Patent JP3824610
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a transmitting circuit using an EER method without signal deterioration and having a high modulation precision.
SOLUTION: The transmitting circuit comprises a modulation signal generating circuit 101, wiring 120 of modulated signals in which an OFDM modulated waves are to be passed therethrough, a detecting circuit 102, wiring 121 of phase components for transmitting the phase components, wiring 122 of amplitude components for transmitting the amplitude components, a level deciding circuit 106 for making level decision of the amplitude components, wiring 111 for supplying a constant voltage, first and second selectors 103, 107, an orthogonal transformer 104, and a high-frequency power amplifier 105. An EER method or an approximated EER method is performed in an area where high-frequency input/output characteristics of the high-frequency power amplifier 105 indicates a linear response when executing a FER method, while a normal modulation is performed in an area indicating a non-linear response. A modulation method is switched by the level deciding circuit and the selector based on a threshold value of a boundary between the area indicating the linear response and the area indicating the non-linear response.
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Inventors:
Mitsuru Tanabe
Koichiro Tanaka
Koichiro Tanaka
Application Number:
JP2004054602A
Publication Date:
September 20, 2006
Filing Date:
February 27, 2004
Export Citation:
Assignee:
Matsushita Electric Industrial Co., Ltd
International Classes:
H04B1/04; H04L27/36; H04J11/00; (IPC1-7): H04B1/04; H04J11/00; H04L27/36
Domestic Patent References:
| JP2004104194A | ||||
| JP2002530917A | ||||
| JP2001119371A | ||||
| JP1503587A |
Foreign References:
| WO2001067593A1 |
Attorney, Agent or Firm:
Hiroshi Maeda
Hiroshi Koyama
Hiroshi Takeuchi
Yuji Takeuchi
Katsumi Imae
Tomoo Harada
Hiroshi Koyama
Hiroshi Takeuchi
Yuji Takeuchi
Katsumi Imae
Tomoo Harada
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