| 摘要 |
<p>A current detecting circuit for detecting the value of current flowing out from an output circuit in an integrated circuit. A resistor (17) for detecting current is inserted in a path through which the current flows out from the output circuit. To both ends of the resistor (17) are connected emitters of two npn-type transistors (15, 16) having collector areas at a ratio of N to 1. Bases of the two transistors (15, 16) are connected together, and the base and the collector of one transistor (15) are connected together. To the collectors of the two transistors (15, 16) is connected a current mirror circuit (14) that consists of two pnp-type transistors (12, 13), and this circuit (14) has an input/output current ratio of M to 1. The base of an output npn-type transistor (18) is connected to a common connection point of collectors of the two transistors (13, 16).</p> |
