(19)
(11) EP 1 406 380 A8

(12) CORRECTED EUROPEAN PATENT APPLICATION
published in accordance with Art. 158(3) EPC

(48) Corrigendum issued on:
21.07.2004 Bulletin 2004/30

(43) Date of publication:
07.04.2004 Bulletin 2004/15

(21) Application number: 01949963.1

(22) Date of filing: 12.07.2001
(51) International Patent Classification (IPC)7: H03D 7/14
(86) International application number:
PCT/JP2001/006062
(87) International publication number:
WO 2003/009465 (30.01.2003 Gazette 2003/05)
(84) Designated Contracting States:
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR

(71) Applicant: MITSUBISHI DENKI KABUSHIKI KAISHA
Tokyo 100-8310 (JP)

(72) Inventors:
  • TAKAHASHI, Yoshinori, c/o MITSUBISHI DENKI K. K.
    Tokyo 100-8310 (JP)
  • JOBA, Hiroyuki,c/o MITSUBISHI DENKI K. K.
    Tokyo 100-8 310 (JP)

(74) Representative: Popp, Eugen, Dr. et al
MEISSNER, BOLTE & PARTNER Postfach 86 06 24
81633 München
81633 München (DE)

   


(54) MIXER CIRCUIT


(57) A frequency components signal LO of a local oscillation wave is input to the base of a transistor (1) configuring a local frequency multiplication unit (10) and a signal (↓LO) opposite in phase to the local oscillation wave is input to the base of a transistor (2). The transistors (1, 2) have their collectors connected together and their emitters connected together, and each collector outputs a modulation signal. A reference transistor (3) is differentially connected to the transistors (1, 2). A load (6) is connected to the collector of each transistor (1-3) serving as an output of differential connection. Each differentially connected transistor (1-3) has its emitter with a collector connected thereto. A transistor (4) has its base receiving a modulated wave signal, and its emitter connected to a constant current source (5). A mixer circuit is thus configured.