| 摘要 |
An analog to digital converter in which the instantaneous difference between each successive analog signal sample magnitude and a corresponding reference magnitude is digitally encoded. A feedback loop having non-linear reference setting means automatically increases or decreases the reference magnitude responsive to the match or mismatch condition of a predetermined number of output digital signals. The reference setting means includes the pulse width modulating of control signals in the feedback loop to provide accurate control of the non-linear reference magnitude variations. The direction of change is determined by the digital output signal polarity. However, if a predetermined succession of output digits match, then a first exponential time rate of change is used in incrementing the reference level. Otherwise, exponential incrementing occurs at a second time rate of change.
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