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As a practical matter, this means that the power supply bus must be capacitively bypassed at the driver with atleast 100X the load capacitance in order to achieve optimum driving speed. It also implies that the bypassing capacitor must have very low internalinductance and resistance at all frequencies ofinterest. Generally, this means using two capacitors, one a high-performance low ESR film, the other a low internal resistance ceramic, as together the valleys in their two impedance curves allow adequate performance over a broad enough band to get the job done. PLEASE NOTE that many film capacitors can be suiciently inductive as to be useless for this service. Likewise, many multilayer ceramic capacitors have unacceptably high internal resistance. Use capacitors intended for high pulse current service (in-house we use WIMATM film capacitors and AVX Ramguard'M ceramics; severalother manufacturers ofequivalent devices also exist). The high pulse current demands of capacitive drivers also mean that the bypass capacitors must be mounted very close to the driver in order to prevent the effects of lead inductance or PCB land inductance from nullifying what you are trying to accomplish. Foroptimum results the sum ofthe lengths of the leads and the lands from the capacitor body to the driver body should total 2.5cm or less.