| 摘要 |
In order to reduce the numbers of resistors and associated switches required in a successive approximation type a-d converter, a resistor-ladder of the d-a converter utilizes a first group of resistors (resistance R) and a second group of resistors each having a resistance equal to R/2L wherein L is the number of lower bits of the digital output. The second group of resistors enables the generation of variable comparison reference signals in response to the output of a successive approximation register.
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