On-chip test circuit for evaluating an on-chip signal using an external test signal
First Claim
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1. A semiconductor chip comprising:
- an on-chip signal;
said on-chip signal having an analog voltage to be evaluated; and
a test circuit that receives an off-chip test signal having an analog voltage and detects the relative magnitude of said analog voltage of said on-chip signal and said analog voltage of said test signal to evaluate the voltage level of the on-chip signal.
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Abstract
An on-chip test circuit for evaluating on-chip signals for a semiconductor memory chip includes an on-chip signal associated with a memory circuit on the chip; said on-chip signal having a signal characteristic to be evaluated; an input circuit for receiving an off-chip test signal; and a test circuit that compares said on-chip signal and said test signal.
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Citations
20 Claims
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1. A semiconductor chip comprising:
- an on-chip signal;
said on-chip signal having an analog voltage to be evaluated; and
a test circuit that receives an off-chip test signal having an analog voltage and detects the relative magnitude of said analog voltage of said on-chip signal and said analog voltage of said test signal to evaluate the voltage level of the on-chip signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
- an on-chip signal;
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15. A method for evaluating an on-chip signal having an analog voltage for a semiconductor chip, comprising the steps of:
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a) applying an externally generated test signal having an analog voltage to one input of a test circuit on the chip; b) applying the on-chip signal being evaluated to another input of the test circuit; c) detecting by said test circuit the relative magnitude of said on-chip signal analog voltage and the analog voltage of said test signal; and d) producing an output from the test circuit that indicates the greater magnitude of the analog voltage of the on-chip signal and the analog voltage of the test signal. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification