| 摘要 |
<p>A pullup circuit (200) having a limited voltage swing and fast pullup and pulldown times comprises a pullup structure (210) and an internal node (N1). The pullup circuit (200) operates to limit the current of the pullup structure (210) before the N-tree (110) discharges the internal node (N1), thereby reducing the pullup effect of the pullup structure (210) to reduce fall time and power consumption. Then the pullup circuit (200) maximizes the current of the pullup structure (210) after the N-tree (110) has pulled down the internal node (N1) to increase the pullup effect of the pullup structure (210) to reduce rise time. As a result, the voltage of the internal node (N1) both charges more quickly when the N-tree (110) becomes inactive and discharges more quickly when the N-tree (110) becomes active.</p> |
