SYSTEM AND METHOD FOR ACHIEVING FAST SWITCHING OF ANALOG VOLTAGES ON A LARGE CAPACITIVE LOAD

摘要

Driver (100) and method are provided for driving capacitive load (120) that achieve an improved response time without increasing power consumption of the driver. Driver (100) has load buffer (105) with an input (110) for receiving an input voltage (VIN), and an output 115 for coupling an output voltage (VOUT) to load 120. VOUT is driven between a first voltage level (V1) and a second voltage level (V2) in response to changes in VIN. Driver (100) also has reserve circuit (125) with capacitor (130), reserve buffer (135), switch (140) for coupling the capacitor to capacitive load (120) and controller (145) for operating the switch. Reserve buffer (135) has an input (150) for receiving an input voltage (VRES-IN), and an output (155) for coupling an output voltage (VRES-OUT) to capacitor (130) to charge the capacitor. Controller (145) is configured to operate switch (140) to couple capacitor (130) to capacitive load (120) when VOUT is being driven between V1 and V2.