Patent ID: 6486715
Filing Date: 2002-11-26
Classification: G11C

Abstract:
A driver for driving a capacitive load, the driver comprising:a load buffer having an input adapted to receive an input voltage (VIN), and an output adapted to couple an output voltage (VOUT) to the capacitive load, the load buffer configured to drive VOUT between a first voltage level (V1) and a second, higher voltage level (V2) in response to a change in VIN; and a reserve circuit configured to reduce time for VOUT to transition between V1 and V2, the reserve circuit comprising: a reserve capacitor; a reserve buffer having an input adapted to receive an input voltage (VRESâ€”IN), and an output adapted to couple an output voltage (VRESâ€”OUT) to the reserve capacitor to charge the reserve capacitor; a first switch whereby the reserve capacitor can be coupled to the capacitive load; and a controller whereby the first switch can be opened and closed, the controller configured to operate the first switch to couple the reserve capacitor to the capacitive load when VOUT is being driven between V1 and V2.