H - Electricity – 03 – K
Patent
H - Electricity
03
K
325/1, 315/27
H03K 3/01 (2006.01) H03K 3/33 (2006.01) H03K 17/0412 (2006.01) H03K 17/78 (2006.01) H04B 10/155 (2006.01)
Patent
CA 1229655
- 10 - AN LED DRIVER CIRCUIT Abstract A driver circuit turns an LED 'on' and 'off' in response to input logic 'one' and 'zero' data signals. A current regulator 11 is series coupled with the LED and serves to maintain a constant current to the LED over time, temperature, and supply voltage variations. During turn-off, this current is shunted away from the LED by a low impedance emitter follower, operated in the active non- saturated region, and a small reverse bias potential is momentarily applied to the LED which quickly sweeps out the charge stored in the LED junction. At the end of the 'off' cycle there is a forward probes potential across the LED. During turn-on, the current shunt is reverse biased and a current peaking circuit provides a momentary additional current through the LED. This instantaneous forward current peaking and the forward probes both serve to substantially reduce the turn-on delay and rise time of the optical drive signal. The current peaking and current shunting circuits are driven from the same differential amplifier.
475448
American Telephone And Telegraph Company
Kirby Eades Gale Baker
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