Method of measuring and calibrating frequency down converter

Details Method of measuring and calibrating frequency down converter Method of measuring and calibrating frequency down converter

2008-01-01

2008-01-01

Urban, Edward F. (Department: 2618)

Telecommunications

Receiver or analog modulated signal frequency converter

Measuring or testing of receiver

C455S260000, C455S339000, C342S174000, C375S356000

Reexamination Certificate

active

10987281

ABSTRACT:
A frequency down converter that maintains accuracy even if the frequency pass band is wide uses a reference frequency band within the frequency pass band, the reference frequency band being resistant to degradation by aging or temperature variation. The ideal characteristics of the reference frequency band are previously stored. The frequency down converter has a calibration signal source that inputs a calibration signal to the frequency down converter to measure the characteristics of the reference frequency band and to store differences from the ideal characteristics. The calibration signal is input to obtain the characteristic data of other frequency bands within the frequency pass band, and the characteristic data are revised by the above differences. Then compensation coefficients to compensate the revised characteristic data into the ideal characteristics are calculated. The frequency down converter uses the compensation coefficients to compensate the frequency domain data, which maintains the accuracy over the wide frequency pass band.

REFERENCES:
patent: 5507015 (1996-04-01), Karczewski et al.
patent: 5847613 (1998-12-01), Langlet et al.
patent: 6377640 (2002-04-01), Trans
patent: 6658075 (2003-12-01), Aftelak
patent: 6670913 (2003-12-01), Talbot et al.

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