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Analog-to-digital converter
| Details |
Inventors: Veerhoek, Jacob J.; Van Tuijl, Adrianus J. M.; Schuurmans, Han M.;
Assignee: U.S. Philips Corporation (New York, NY)
Primary Examiner: Pellinen; A. D.
Assistant Examiner: Logan; Sharon D.
Attorney, Agent or Firm: Franzblau; Bernard
A successive approximation analog-to-digital converter whose susceptibility to errors is reduced by the use of overlapping measurement ranges in the successive conversion steps. |
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DETAILED DESCRIPTION It is an object of the invention to provide a successive-approximation analog-to-digital converter which is less susceptible to erroneous decisions.
To this end, an analog-to-digital converter of the type defined in the opening paragraph is characterized in that the analog-to-digital converter further comprises: generator means for generating, on the basis of the comparison signal generated in a conversion step, new reference signals for the next conversion step, the new reference signals defining a new fraction of the input signal range for the next conversion step, which new fraction overlaps one of the sub-ranges of the relevant conversion step.
The new reference signals for the next conversion step define a new fraction which, in contradistinction to that in the prior-art converters, is not equal to one of the sub-ranges of the conversion step which is in progress, but which overlaps one of the sub-ranges thereof.
The overlap enables an erroneous decision to be corrected in a subsequent conversion step.
For example, if, as a result of noise or an inadequate speed a comparator makes a decision error which corresponds to an analog signal value within the range of overlap, the signal value will be included in the new fraction in the next conversion step.
The analog-to-digital converter in accordance with the invention has error correcting capabilities so that the influence of erroneous decisions on the resulting digital output signal is reduced substantially.
Therefore, the converter in accordance with the invention allows the use of slower and hence less noise-sensitive components, in particular comparators, without the accuracy being degraded.
On the other hand, it is possible to realise a more accurate analog-to-digital converter using the same components.
In contrast with the prior-art successive-approximation analog-to-digital converter, in which the reference signals are the analog representatives of the digital output signal so far successively approximated in the SAR, the digital representatives of the reference signals in the converter in accordance with the invention deviate therefrom as a result of the overlap
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