| 摘要 |
There is disclosed a three-state buffer including a comparator circuit which comprises a plurality of bipolar transistors and which generates first and second control voltages which are dependent upon the forward biased base to emitter voltage drops of the transistors. The comparator circuit also includes a threshold circuit establishing a threshold voltage intermediate the first and second control voltages which is also dependent upon the forward biased base to emitter voltage drops of the transistors. As a result, the threshold voltage is always intermediate the first and second control voltages to assure reliable operation of the comparator circuit notwithstanding variations in integrated circuit processing parameters or integrated circuit operating temperatures.
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