| 摘要 |
A system and method is provided for controlling the impedance and current of an off chip driver circuit to match to load driven by the driver and for reducing noise and ringing in the off chip driver circuit. The driver comprises a pull up transistor for switching the output of the driver to a high-voltage, a pull down transistor for switching the output of the driver to a low voltage, a first current mirror transistor coupled to the pull up transistor for controlling the current transmitted to a load connected to the driver when the output of the driver is at the high-voltage, and a second current mirror transistor coupled to the pull down transistor for controlling the current transmitted to the load when the output of the driver is at the low voltage. In addition, the driver may include a first pre-driver providing a gate signal for the pull up transistor having a controlled slew rate and a second pre-driver providing a gate signal for the pull down transistor having a controlled slew rate.
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