Title:
RECEIVER OF DOUBLE CONVERSION SYSTEM
Document Type and Number:
WIPO Patent Application WO/2004/042945
Kind Code:
A1
Abstract:
A receiver of double conversion system wherein unwanted components included in received signals can be removed without fail and wherein the number of constituent parts has been reduced. The receiver comprises an antenna tuning circuit (10) including a tuning coil (11) and a variable-capacitance diode (13); a high-frequency amplifying circuit (20) for performing a high-frequency amplification of a signal outputted by the antenna tuning circuit (10); two-stage mixing circuits (22,28) for performing two frequency conversions of an output from the high-frequency amplifying circuit (20); and a detecting circuit (36) for detecting an output from the latter-stage mixing circuit (28).
Inventors:
MIYAGI HIROSHI (JP)
KATSUNAGA HIROSHI (JP)
KATSUNAGA HIROSHI (JP)
Application Number:
PCT/JP2003/013108
Publication Date:
May 21, 2004
Filing Date:
October 14, 2003
Export Citation:
Assignee:
NIIGATA SEIMITSU CO LTD (JP)
TOYOTA JIDOSHOKKI KK (JP)
MIYAGI HIROSHI (JP)
KATSUNAGA HIROSHI (JP)
TOYOTA JIDOSHOKKI KK (JP)
MIYAGI HIROSHI (JP)
KATSUNAGA HIROSHI (JP)
International Classes:
H04B1/26; H03J3/28; H04B1/10; H04B1/18; H03D7/16; H03J1/00; H04B1/28; (IPC1-7): H04B1/26; H03J3/28; H03M1/10; H04B1/18
Foreign References:
| JPH10173565A | 1998-06-26 | |||
| JPS6377275A | 1988-04-07 | |||
| JPH0543629U | 1993-06-11 | |||
| JP2002319846A | 2002-10-31 |
Attorney, Agent or Firm:
Amagai, Masahiko (3-10 Hyakunin-cho 3-chome, Shinjuku-k, Tokyo ., JP)
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