| 摘要 |
The subtraction circuit according to the subject of the invention is a true subtraction circuit, because it has a main circuit (2), which is a true subtraction circuit. This main circuit (2) processes only the value 2, because this reduces the size of the main circuit (2) to a quarter. The value 1 is processed in the dual full subtractor (6). The value 5 is processed in the dual full subtractor (7). Circuit (3) is a blocking circuit, which passes on only the high potential with the lowest value of the high potentials which occur in the output area of the main circuit (2). Circuit (4) is not a one-downwards shift circuit but a one-upwards shift circuit, because no possible subtrahend with the value 1 is processed using this circuit, but a possible partial minuend with the value 1 is processed. <IMAGE>
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