MEASUREMENT METHOD, MEASUREMENT APPARATUS AND MEASUREMENT PROGRAM

摘要

[Problem] To shorten the measurement time, while maintaining the measurement precision, for a data converter of delta-sigma system.;[Solution] A measurement method of the present embodiment is a measurement method for a delta-sigma type of data converter that performs a data conversion between an analog signal and a digital signal. The measurement method comprises:;successively measuring and taking in output digital codes outputted via data conversions performed, by a data converter, on the basis of ramp-waveform inputs generated on the basis of input voltage values at predetermined intervals; selecting and pairing, as pair combinations, those ones of the output digital codes which are different from each other and further adjacent to each other in order of magnitude of value; performing, for each combination, a predetermined statistical processing by use of the output digital codes belonging to the combination or by use of the input voltage values corresponding to these output digital codes; and calculating a nonlinear error from the result of the statistical processing.

主权项

1. A measurement method for delta-sigma type data converter, which converts data between analog domain and digital domain,
wherein said measurement method:
which sequentially captures output digital codes through data conversion by said data converter, corresponding to ramp signal inputs generated by certain step input voltages;which makes pairs of vary and neighbor output digital codes in order in said output digital codes;which processes statistical calculations by using said output digital codes or input voltages corresponding to said output digital codes;and which calculates non-linearity errors form said statistical calculations.