Light emitting diode driver circuit

Details Light emitting diode driver circuit Light emitting diode driver circuit

1984-11-21

1986-11-11

Miller, Stanley D.

Electrical transmission or interconnection systems

Personnel safety or limit control features

Interlock

307270, 307490, H03K 1914, H03K 326, G06G 712

Patent

active

046224777

ABSTRACT:
An LED driver circuit of a digital optical transmitter for an optical fiber data link includes a differential amplifier with emitter coupled transistors, an LED being connected to the collector of one of the emitter coupled transistors. A current source is connected to the common emitters to enable switching of the emitter coupled transistors in response to an input signal. The input signal, a first delayed input signal and a second delayed input signal, are applied to the current source through an OR circuit, to render the current source conductive in response to said input signal, the first delayed input signal or the second delayed input signal. The first delayed input signal and an inverted first delayed input signal switch the emitter coupled transistors when the current source is conductive. As the current source is conductive at the transistor switching times, high speed switching with smooth charging and discharging of the LED junction capacitance is achieved. Further, since the current source turns on and off in response to the input signal current consumption is conserved.

REFERENCES:
patent: 4063117 (1977-12-01), Laugesen et al.
patent: 4404474 (1983-09-01), Dingwall
patent: 4533838 (1985-08-01), Fujita

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