| 摘要 |
PROBLEM TO BE SOLVED: To provide a clamp circuit that performs almost an accurate clamp operation. SOLUTION: This clamp circuit comprises an NPN transistor Q21 whose emitter is connected to a GND voltage, an NPN transistor Q24 whose emitter is connected to a first clamp terminal 1, whose base is connected to the collector of the transistor Q21 and whose collector is connected to the base of the transistor Q21, an NPN transistor Q22 whose emitter is connected to the collector of the transistor Q21 and whose base is connected to its own collector, an NPN transistor Q23 whose emitter is connected to the collector of the transistor Q24, whose base is connected to the base of the transistor Q22 and whose collector is supplied with a bias, and a current source I20 connected to the collector of the transistor Q22. |
