R7615 ODL(TM) 200 Transmitter LED charge extraction circuit probing results.

The R7615 Transmitter readily meets the ODL(TM) 200 speed requirements without the use of the charge extraction circuit and will be remetallized to remove all such circuitry. A very important added benefit is a 25% reduction in power consumption. The purpose of the charge extraction circuit is to eliminate the turn-off transition tail in the detected LED light output by removing the stored charge at turn-off. Detailed voltage probe measurements internal to the chip of the R7615 Transmitter LED Driver show the part of the charge extraction circuit which generates a momentary pulse to extract charge during the LED turn-off transition to work exactly as predicted at 200Mbits/s.