Method for determination of errors in analogue-digital conversio

Details Method for determination of errors in analogue-digital conversio Method for determination of errors in analogue-digital conversio

1995-06-30

1997-05-20

Gaffin, Jeffrey A.

Coded data generation or conversion

Converter calibration or testing

341155, H03M 110

Patent

active

056316461

ABSTRACT:
Method for determination of time errors in connection with analogue-digital conversion of quadrature detected signals by feeding a special, periodically repeated signal, the frequency of which is changed during each period, to the device whose time errors are to be determined. The special signal is quadrature detected, whereby two quadrature components (I and Q) are formed. The quadrature components are sampled and the samples are converted to digital form, whereby each of the quadrature components are sampled at at least two fixed points of time for each period of the special signal. The samples from a number of periods of the special signal related to the fixed points of time are Fourier transformed in order to generate spectra in which expressions are contained which describe both the fundamental tone of the special signal and its image tone. From the expressions, a relation between the fundamental tone and the image tone is formed and the time error is calculated from the value of the relation for at least two fixed sampling points of time. (FIG. 1 )

REFERENCES:
patent: 3950750 (1976-04-01), Churchill et al.
patent: 4003054 (1977-01-01), Goldstone
patent: 4700222 (1987-10-01), Large et al.
patent: 4875049 (1989-10-01), Yoshida
patent: 5124708 (1992-06-01), Mackes et al.
patent: 5216425 (1993-06-01), Erhage

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