| 摘要 |
An apparatus includes a transmission line for deployment in a well, and a driver to transmit signals over the transmission line. The driver includes a field-effect transistor (224, 242), and an operational amplifier (226, 244) to control the field-effect transistor (224, 242), where the operational amplifier (226, 244) and field-effect transistor (224, 242) cooperate to form a voltage-to-current converter.
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