| 摘要 |
A three-valued switching circuit having one control input terminal and one output terminal and including at least two transistors constituting a differential pair, and one constant current source connected to a common emitter terminal of the at least two transistors, in which a collector of one of said at least two transistors is connected to said output terminal to output three kinds of current values from said output terminal in response to a three-valued logic control signal applied to said control input terminal.
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