A high-voltage electro-optic driver with DMOS power FETs and optocoupling isolation

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Abstract
A new linear high-voltage driver capable of delivering floating AC voltages in the kV range for the normal type electro-optic loads is presented. The system's novelty lies in the utilisation of multiple amplifying channels using DMOS power MOSFET pairs isolated by means of LED/photodiode optocouplers. General design criteria and justifications are first considered, along with the circuitry of the various stages. An implemented system is presented, which has proved capable of driving a 5 pF electro-optic crystal load over a 5 Hz-2.0 MHz frequency range or a 62 pF Kerr cell up to 180 kHz, with a maximum distortion of 2% for a voltage up to 1.5 kV peak to peak. Gain-bandwidth products of 1.5 kV peak to peak. Gain-bandwidth products of 4.0 GHz and 350 MHz, respectively, have been measured while noise and offset performance were satisfactory.
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