Title:
周波数変換回路、無線周波受信機、および無線周波トランシーバ
Document Type and Number:
Japanese Patent JP4298468
Kind Code:
B2
Abstract:
A frequency conversion circuit of the present invention includes: (i) a first mixer for mixing the radio frequency signal having a frequency fRF with a first oscillation signal having a frequency fLO1 so that the radio frequency signal is downconverted into an intermediate frequency signal; and (ii) a second mixer for mixing the intermediate frequency signal sent from the first mixer with two local oscillation signals so that the intermediate frequency signal is downconverted into two base-band signals having different phases. The second local oscillation signals have phases of 0° and 270°, respectively. These frequencies satisfies: fLO1=kxfRF(k>1) fLO2=fLO1/m, (m>1) k=m/(m-1). This arrangement ensures (i) a small frequency conversion circuit that can be mounted on an integrated circuit, (ii) a radio frequency receiver including the frequency conversion circuit, and (iii) a radio frequency transceiver including the radio frequency receiver.
Inventors:
Albert O. Adan
Shinji Kamiya
Shinji Kamiya
Application Number:
JP2003372535A
Publication Date:
July 22, 2009
Filing Date:
October 31, 2003
Export Citation:
Assignee:
Sharp Corporation
International Classes:
H04B1/26; H03D7/00; H03D7/14; H03D7/18; H03K9/00; H04B1/16; H04B1/40
Domestic Patent References:
| JP2001168934A | ||||
| JP2003188753A | ||||
| JP2003520487A | ||||
| JP2001086024A |
Attorney, Agent or Firm:
Kenzo Hara International Patent Office
Kenzo Hara
Ryuichi Kijima
Ichiro Kaneko
Kenzo Hara
Ryuichi Kijima
Ichiro Kaneko