| 摘要 |
We describe an input circuit and method. The input circuit includes a variable reference level generator that increases a level of a reference signal in proportion to a time when an input signal transits from a low level to a high level and decreases the level of the reference signal in proportion to a time when the input signal transits from a high level to a low level. An analyzer compares the level of the input signal with the level of the reference signal, determines the level of the input signal, and outputs a signal based on the comparison. The input circuit and method widen the minimum difference between the input and reference signal to facilitate analysis of the input signal.
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