Title:
直交復調装置、方法、記録媒体
Document Type and Number:
Japanese Patent JP4360739
Kind Code:
B2
Abstract:
A quadrature demodulator capable of calibrating an I (Q) signal conversion section without stopping the receiving operation performed by the quadrature demodulator. The quadrature demodulator comprises: an adder 32 for generating a pseudo noise superimposed signal obtained by adding a user signal IF and a pseudo noise PN; a signal conversion section 100 for generating a converted signal obtained by mixing the pseudo noise superimposed signal with a local frequency signal L1 of a predetermined local frequency; a first multiplier 72 for generating a correlated signal obtained by multiplying the converted signal with the pseudo noise, a first integrator 82 for integrating the correlated signal to provide an output; and a succeeding circuit 90 for processing the converted signal in a desired way. While performing calibration by causing the first multiplier 72 to extract the pseudo noise, the quadrature demodulator allows the succeeding circuit 90 to process the converted signal in a desired way. Therefore, the quadrature demodulator can calibrate the signal conversion section 100 without stopping its own receiving operation.
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Inventors:
Takashi Kato
Application Number:
JP2000113409A
Publication Date:
November 11, 2009
Filing Date:
April 14, 2000
Export Citation:
Assignee:
Advantest Corporation
International Classes:
H04L27/18; H03D1/22; H03D3/00
Domestic Patent References:
| JP8335924A | ||||
| JP7046153A | ||||
| JP10290209A | ||||
| JP9261116A | ||||
| JP8032486A | ||||
| JP8154083A | ||||
| JP3003531A | ||||
| JP2005664A |
Attorney, Agent or Firm:
Masumi Hosoda