Title:
PLL MODULATION CIRCUIT, RADIO TRANSMISSION DEVICE, AND RADIO COMMUNICATION DEVICE
Document Type and Number:
WIPO Patent Application WO/2007/083635
Kind Code:
A1
Abstract:
Provided are a PLL modulation circuit, a radio transmission device, and a radio communication
device capable of maintaining a modulation accuracy for modulation of a wide
band. The PLL modulation circuit (100) includes: a PLL unit (110), first modulation
signal input means for inputting a first modulation signal to a divider (112)
or a phase comparator (113) of the PLL unit (110); second modulation signal input
means for DA converting the digital modulation signal in a DA converter (116)
to generate an analog second modulation signal and inputting it to a voltage control
oscillator (111) of the PLL unit (110); a second divider for dividing the output
signal of the voltage control oscillator (111); and control means for generating
a center frequency control signal, a gain control signal, and a second division
ration control signal according to the channel selection signal and the control
voltage inputted to the voltage control oscillator (111) and supplying them
to the divider (112), the DA converter (116), and the second divider (114), respectively.
Inventors:
MITANI YOUSUKE
HIRANO SHUNSUKE
ISHIDA KAORU
HIRANO SHUNSUKE
ISHIDA KAORU
Application Number:
PCT/JP2007/050527
Publication Date:
July 26, 2007
Filing Date:
January 16, 2007
Export Citation:
Assignee:
MATSUSHITA ELECTRIC IND CO LTD (JP)
MITANI YOUSUKE
HIRANO SHUNSUKE
ISHIDA KAORU
MITANI YOUSUKE
HIRANO SHUNSUKE
ISHIDA KAORU
International Classes:
H03C3/00; H03L7/183
Foreign References:
| JP2005304004A | 2005-10-27 | |||
| JPH05343990A | 1993-12-24 |
Attorney, Agent or Firm:
WASHIDA, Kimihito (Shintoshicenter Bldg. 24-1, Tsurumaki 1-chome, Tama-sh, Tokyo 34, JP)
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