1_MHz_LED_PULSE_MODULATION

Published:2009/7/2 3:40:00 Author:May | From:SeekIC

Circuit provides required low driving-point impedance for fast turn-on of gallium arsenide phosphide LED used as source for high-speed pulse modulation of fiber-optic or otherlight beam. Q1 supplies DC level and modulation information to emitterfollower output stage Q3. Output current is sensed and limited to about 30 mA by Q2. Turn-on time for full brightness is 12 ns.-G.Schmidt, LED Modulator, EDN/EEE Magazine, June 15,1971,p 57.



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