| 摘要 |
PURPOSE:To allow a large current to flow to an output transistor only in a synchronizing period, to expand a synchronizing signal again, and to improve the shortening of the synchronizing signal by adding a transistor and a resistance for constituting a pair of current mirrors. CONSTITUTION:To the clamping circuit, transistors Q2, Q3 and resistances R3, R4 for constituting a pair of current mirrors are added, and transistors Q4, Q5 and resistances R5, R6 for constituting the other pair of current mirrors are added. Accordingly, a current generated at the time of clamping can be added to an output transistor by the constitution of the pair of current mirrors. In such a way, by allowing a large current to flow to the output transistor only in a synchronizing signal period and expanding the synchronizing signal again, the shortening of the synchronizing signal can be improved. |
