Title:
TRANSMITTER
Document Type and Number:
Japanese Patent JP3844352
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To automatically adjust the synchronization between an amplitude signal and a phase signal in a transmitter such as a polar modulation transmitter.
SOLUTION: A polar signal generation circuit 101 generates a signal corresponding to the amplitude and phase of a transmission modulated wave from an input signal, modulates the amplitude of the phase modulated wave to generate a transmission modulated wave by multiplying the amplitude signal by the phase signal in a multiplication circuit 107 and radiates the transmission modulated wave as a radio wave from an antenna 108. An amplitude and phase detection circuit 109 detects an amplitude signal and a phase signal from an input of the multiplication circuit 107 and an input of a phase modulated signal generation circuit 106, and a delay difference calculation circuit 110 calculates respective correlation functions from the respective detected amplitude and phase signals and calculates a delay difference from those maximum values. A timing adjustment circuit 102 performs timing adjustment by adjusting the delay time of the amplitude signal and the phase signal on the basis of the calculated delay difference.
Inventors:
Udagawa Shoji
Ara Yashiki
Ara Yashiki
Application Number:
JP2003288964A
Publication Date:
November 08, 2006
Filing Date:
August 07, 2003
Export Citation:
Assignee:
Matsushita Electric Industrial Co., Ltd
International Classes:
H04B1/04; H03F1/02; H03F1/06; H03F1/32; H03F3/24; H04B1/707; H04B1/7073; H04B14/00; (IPC1-7): H04B1/04; H04B1/707
Domestic Patent References:
| JP2004356835A | ||||
| JP2004128933A |
Foreign References:
| WO2003050947A1 | ||||
| WO2001086806A1 | ||||
| WO2001058012A1 |
Attorney, Agent or Firm:
Shohei Oguri
Hironori Honda
Toshimitsu Ichikawa
Takeshi Takamatsu
Hironori Honda
Toshimitsu Ichikawa
Takeshi Takamatsu