Title:
ORTHOGONAL BALANCE MIXER CIRCUIT AND RECEIVER
Document Type and Number:
Japanese Patent JPH1141033
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To provide an orthogonal balance mixer circuit that improves the orthogonality between an in-phase channel signal and a quadrature channel signal, improves stability against level fluctuation and easily compensates for a DC offset. SOLUTION: A vector error detection circuit 25 detects an error in the orthogonality between an in-phase channel signal and a quadrature channel signal outputted to output terminals 26A, 26B and gives a phase control detection signal Pe3 to a phase control circuit 24. The phase control circuit 24 gives a sine value SINθ to a phase shift circuit 23, multiplies the value with the in-phase channel signal and the quadrature channel signal, inverts the products, then they are added by adders 233, 234 to control the phase so that the orthogonality is maintained. Furthermore, a vector error detection circuit 25 detects a gain control detection signal Pe2 to control a gain control circuit 22 so that variable gain circuits 20, 21 adjust the level. Moreover, the vector error detection circuit 25 detects a DC offset detection signal Pe1 to control a DC offset control circuit 19 to allow DC offset compensation circuit 17, 18 to compensate for the DC offset.
Inventors:
KONDO NORIAKI
SATO KENICHI
SATO KENICHI
Application Number:
JP19530697A
Publication Date:
February 12, 1999
Filing Date:
July 22, 1997
Export Citation:
Assignee:
OKI ELECTRIC IND CO LTD
International Classes:
H03D7/00; H03C3/04; H04B1/26; (IPC1-7): H03D7/00; H03C3/04; H04B1/26
Domestic Patent References:
| JPH08307465A | 1996-11-22 | |||
| JPH02151107A | 1990-06-11 |
Attorney, Agent or Firm:
Takao Katori
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