Title:
画像除去2次フィルタ
Document Type and Number:
Japanese Patent JP2005536080
Kind Code:
A
Abstract:
An image rejection quadratic filter is tunable to filter image frequencies over a wide band. In one embodiment, the image rejection filter includes in-phase and quadrature phase mixers. The image rejection has a fractional transfer function. The image rejection filter has two sub-circuits, wherein the first sub-circuit produces the imaginary component of the transfer function, and the second sub-circuit produces the real component of the transfer function. The first sub-circuit receives the Q signal, and the second sub-circuit receives the I signal. In one embodiment, to create the fractional transfer function, a multi-feedback looped integrator is used.
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Inventors:
Utsunomiya, Kimitake
Kamata, Takatsugu
Kamata, Takatsugu
Application Number:
JP2004510102A
Publication Date:
November 24, 2005
Filing Date:
May 29, 2003
Export Citation:
Assignee:
Rfstream inc.
International Classes:
H03D7/18; H03H11/04; H03H11/12; H04B1/26; H04N5/44; (IPC1-7): H03D7/18; H03H11/04; H04B1/26; H04N5/44
Attorney, Agent or Firm:
Kazunori Saito
Tetsuya Ito
Tetsuya Ito