AC level calibration apparatus
First Claim
1. An analog test system, comprising:
- a DC power source for generating a DC reference voltage;
a digital signal generator for generating an alternating control signal which is a first level signal for a first time period, and a second level signal for a second time period;
an analog switching device, coupled to an output of said DC power source and an output of said digital signal generator, for interrupting the flow of the reference voltage based on the alternating control signal generated by said digital signal generator and for changing the reference voltage into an AC level calibration signal waveform;
a waveform digitizer, coupled to said analog switching device, for converting the AC level calibration signal into a digital data signal;
digital signal processing means, coupled to said waveform digitizer, for obtaining reference values from the digital data signal;
comparing means for comparing said reference values from the digital data signal with predetermined reference values and for obtaining an AC level error; and
compensating means for calibrating for said AC level error.
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Accused Products
Abstract
In an analog test system for testing integrated circuit chips, AC level calibration is achieved by adding a minimal number of new elements and more fully utilizing elements existing in the system. A reference voltage from an existing precision DC power source is fed to an analog switching device. A control signal is also fed into the analog switching device from an existing digital signal generator. Based on the control signal, the analog switching device converts the reference voltage into a rectangular waveform signal, which is then digitized. The digital signal is analyzed, and data from the digital signal is compared with reference data, and the AC level error, if any, is determined. AC level calibration is based on this error.
45 Citations
5 Claims
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1. An analog test system, comprising:
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a DC power source for generating a DC reference voltage; a digital signal generator for generating an alternating control signal which is a first level signal for a first time period, and a second level signal for a second time period; an analog switching device, coupled to an output of said DC power source and an output of said digital signal generator, for interrupting the flow of the reference voltage based on the alternating control signal generated by said digital signal generator and for changing the reference voltage into an AC level calibration signal waveform; a waveform digitizer, coupled to said analog switching device, for converting the AC level calibration signal into a digital data signal; digital signal processing means, coupled to said waveform digitizer, for obtaining reference values from the digital data signal; comparing means for comparing said reference values from the digital data signal with predetermined reference values and for obtaining an AC level error; and compensating means for calibrating for said AC level error. - View Dependent Claims (2, 3, 4, 5)
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Specification