| 摘要 |
<p>A reference voltage generating circuit which comprises transistor Q2 and resistors R2 and R3 and transistor Q1 are formed integrally in a current mirror circuits, and the collector potential of transistor Q2 is used as the reference voltage. Thus, the present invention provides an active pull-down circuit capable of stabiliszing a steady state current which passes through the transistor (Q1) for pull-down operation and reducing variations of the delay time. <IMAGE></p> |
