High-speed current switch circuit

摘要

A high-speed current switch circuit of this invention has an n-type MOS transistor Q 11 which switches and outputs a current, and a control circuit 11 which performs switching control of the MOS transistor Q 11 . In the control circuit 11 , a source follower is formed by an N-type MOS transistor Q 12 and a constant current source I 2 which is a load on this transistor. A switch SW 11 is connected to the MOS transistor Q 12 to perform switching control of a current flowing through the MOS transistor Q 12 . The control circuit 11 includes a switch SW 12 capable of grounding the gate of the MOS transistor 11 . The source of the MOS transistor Q 12 is connected to the gate of the MOS transistor Q 11 . Thus, even if a large current is caused to flow through the output transistor, the output transistor can be made to operate for switching at a high speed.