Switching circuit using closed control loop to precharge gate of switching transistor and stable open loop to switch the switching transistor

Abstract

A switching circuit that transitions using a switch transistor. During the initial stages of a high-low transition, a control loop provides supplemental pre-charge to the gate of the switch transistor to reduce high-low switching delays. Once the current flowing through the switch transistor rises to a level causing the output voltage to change at specified speed threshold, a loop opening mechanism opens the loop. Further opening of the switch transistor in the high-low transition is taken care of by a relatively constant current source. At that point, no or negligible feedback current is used to charge the gate of the switch transistor. Low-high transitions may be performed in a similar complementary manner.