| 摘要 |
PROBLEM TO BE SOLVED: To set a threshold value at the reference of signal input by connecting active loads to a pair of output ends of a current mirror circuit respectively, and controlling the active load of the other terminal connecting an outside output terminal in response to voltage value of one terminal. SOLUTION: A current mirror circuit 2 connects an input terminal Sin to a signal supply means, couples an output terminal (a) to active load 6 and connects another output terminal (b) to the other active load 4 and an outside output terminal Sout respectively. A control circuit 3 controls current flowing in the load 4 in response to voltage of the terminal (b). A ratio of current supply ability of the loads 4, 6 is set at a previously proper ratio. When signal current (is) is input to the terminal Sin, current of (is)×N is flowed to the terminals (a), (b) of the circuit 2 in response thereto (N is determined by the constituent element of the circuit 2). The control circuit 3 is connected to the terminal (a), when the terminal (a) is prescribed voltage, the control electrode of the loads 4, 6 is controlled to flow current, and the current of is×N/M is flowed in the terminal (b). Thus, in the terminal (b) the value is/M is made a threshold value to change over the output.
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