Method and system of compressing raw fabrication data for fault determination
First Claim
1. A method of compressing raw data representing an operational parameter of a semiconductor manufacturing equipment for fault determination, comprising the steps of:
- inputting into a signal convertor a collection of raw data points representing operational parameters of the semiconductor manufacturing equipment within a predetermined time period;
obtaining an approximation of the raw data points with a Fourier series by the signal converter;
computing the Fourier coefficients and the residuals between each of the raw data points and the corresponding predicted values by the Fourier series;
determining if the residuals exceed an error threshold; and
if none of the residual exceeds the error threshold, recording and storing in a data storage device the Fourier coefficients as the compressed data;
if the corresponding residual exceeds the error threshold, recording in the data storage device the raw data point as abnormal data point before recording and storing the Fourier coefficients and the abnormal data point as the compressed data.
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Abstract
The instant disclosure relates to a raw data compression method for the fabrication process. The method includes the steps of: inputting into a signal converter a collection of raw data points representing operational parameter of a semiconductor equipment within a predetermined time period; obtaining an approximation of the raw data points with a Fourier series; computing the Fourier coefficients and the residuals between the raw data points and the corresponding predicted values predicted by the Fourier series; determining if the residuals exceed an error threshold; recording and storing the Fourier coefficients as the compressed data if none of the residuals exceeds the error threshold; and recording the raw data point as abnormal data point if the corresponding residual exceeds the error threshold before recording and storing the Fourier coefficients and the abnormal data point as the compressed data.
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Citations
10 Claims
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1. A method of compressing raw data representing an operational parameter of a semiconductor manufacturing equipment for fault determination, comprising the steps of:
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inputting into a signal convertor a collection of raw data points representing operational parameters of the semiconductor manufacturing equipment within a predetermined time period; obtaining an approximation of the raw data points with a Fourier series by the signal converter; computing the Fourier coefficients and the residuals between each of the raw data points and the corresponding predicted values by the Fourier series; determining if the residuals exceed an error threshold; and if none of the residual exceeds the error threshold, recording and storing in a data storage device the Fourier coefficients as the compressed data; if the corresponding residual exceeds the error threshold, recording in the data storage device the raw data point as abnormal data point before recording and storing the Fourier coefficients and the abnormal data point as the compressed data. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A system for compressing raw data from a semiconductor manufacturing equipment, comprising:
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a signal converter for gathering a collection of raw data points from the semiconductor manufacturing equipment within a predetermined time period, for approximating the raw data points by a Fourier series, for computing the Fourier coefficients and the residuals between the raw data points and the corresponding predicted values by the Fourier series, and for determining if any residual exceeds an error threshold; a data storage device electrically coupled to the signal converter, wherein the data storage device is used to record and store the Fourier coefficients as the compressed data; a waveform restoration device coupled electrically to the data storage device, wherein the waveform restoration device is used to restore the original waveform of the measured data from the compressed data. - View Dependent Claims (9, 10)
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Specification