| 摘要 |
An output buffer circuit is disclosed that can enhance AC performance and suppress reflected noise. An output buffer circuit can include a first driver circuit (21) and at least one second driver circuit (2n) for sending signals on a transmission line. A first driver circuit (21) can have an output impedance that essentially matches a characteristic impedance of the transmission line. A signal judging circuit (1) can determine when an input data signal (DATA) makes a transition. During such transition times, a signal may be driven on the transmission line by both the first and second driver circuits (21 to 2n) according to the input data signal. When the input signal data has the same value for a predetermined amount of time, a signal may be driven on the transmission line by the first driver circuit (21), and not the second driver circuit (2n) according to the input data signal. Transitions in an input data signal may be represented by data signals of a signal judging circuit (1) having different values. A continuously same input data signal may be represented by data signals of the signal judging circuit (1) having the same values.
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