| 摘要 |
A current mode transmitter is provided including a charge circuit connected to an enable node and adapted to generate a charge current upon the receipt of an activation signal at the enable node. Also included is a discharge circuit connected to the enable node and adapted to generate a discharge current upon the cessation of the receipt of the activation signal at the enable node. An output circuit is connected between an output node and the charge and discharge circuits. The output circuit serves for generating an output current at the output node in response to the charge current and the discharge current. Such output current is initiated within a first delay after the detection of the activation signal by the charge circuit. Further, the output current is terminated within a second delay after the detection of the cessation of the receipt of the activation signal by the discharge charge circuit. The first delay and the second delay are substantially similar such that a pulse width of the output current is substantially similar to a pulse width of the activation signal received at the enable node. The output current may thus be used to drive an infrared light emitting diode with very fast rise and fall times while maintaining tight control over the pulse width of the output current.
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