| 摘要 |
An output buffer includes a pair of main complimentary MOS transistors connected to at least one additional pair of complementary MOS transistors connected in parallel to the pair of main transistors by means of a pair of switches controlled by a numeric word for activating or not activating the additional pair of transistors. A control circuit delivers the numeric word which represents the conductivity of the pair of main transistors included in the output buffer. The additional transistors are sized in such a way that when they are activated, the equivalent impedance of the output buffer is approximately constant.
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