AC IMPEDANCE MEASURING DEVICE
First Claim
1. An AC impedance measuring device, comprising:
- a signal generator configured to provide a first signal on which a period signal is superimposed to a DUT (device under test);
a Fourier transform unit configured to perform Fourier transform on current data and voltage data output from the DUT using a transformation window having a time width that is an integral multiple of a period of the first signal, while sequentially shifting a start time of the transformation window, thereby obtaining a plurality of Fourier transform data strings of the voltage data and the current data, wherein at least one of the current data and the voltage data includes a transient response;
a difference sequence calculator configured to sequentially calculate a first difference sequence of the Fourier transform data strings of the voltage data and a second difference sequence of the Fourier transform data strings of the current data; and
an impedance calculator configured to calculate an impedance of the DUT based on a ratio of the first difference sequence and the second difference sequence.
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Accused Products
Abstract
An AC impedance measuring device includes: a signal generator configured to provide a first signal on which a period signal is superimposed to a DUT; a Fourier transform unit configured to perform Fourier transform on current data and voltage data output from the DUT using a transformation window while sequentially shifting a start time of the transformation window, thereby obtaining a plurality of Fourier transform data strings of the voltage data and the current data; a difference sequence calculator configured to sequentially calculate a first difference sequence of the Fourier transform data strings of the voltage data and a second difference sequence of the Fourier transform data strings of the current data; and an impedance calculator configured to calculate an impedance of the DUT based on a ratio of the first difference sequence and the second difference sequence.
28 Citations
5 Claims
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1. An AC impedance measuring device, comprising:
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a signal generator configured to provide a first signal on which a period signal is superimposed to a DUT (device under test); a Fourier transform unit configured to perform Fourier transform on current data and voltage data output from the DUT using a transformation window having a time width that is an integral multiple of a period of the first signal, while sequentially shifting a start time of the transformation window, thereby obtaining a plurality of Fourier transform data strings of the voltage data and the current data, wherein at least one of the current data and the voltage data includes a transient response; a difference sequence calculator configured to sequentially calculate a first difference sequence of the Fourier transform data strings of the voltage data and a second difference sequence of the Fourier transform data strings of the current data; and an impedance calculator configured to calculate an impedance of the DUT based on a ratio of the first difference sequence and the second difference sequence. - View Dependent Claims (2, 3, 4, 5)
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Specification