Electrical transmission or interconnection systems – Personnel safety or limit control features – Interlock
Patent
1987-08-28
1989-04-04
Miller, Stanley D.
Electrical transmission or interconnection systems
Personnel safety or limit control features
Interlock
307270, 307311, 307355, 307455, 330252, H03K 1914, H03K 1712, H03K 1764, H03K 19086
Patent
active
048188964
ABSTRACT:
A driver for an electro-optical transducer, such as a light-emitting diode (LED) is disclosed which shapes current pulses so as to contain "spikes" during turn-on and turn-off in order to quickly charge and discharge the junction and stray capacitances of the LED. Degeneration resistors interconnect the emitters of switching transistors used in a differential amplifier supplying the current to the LED and in a differential amplifier supplying a "peaking" current to the switching amplifier. A capacitor couples the amplifiers to conduct the additional current to the LED when it is initially turned on and charges the cathode of the LED. The emitter degeneration resistors couple the amplifiers to current sources and allow the amplifiers to be driven by emitter-coupled logic (ECL) gates without ringing. The resistors also linearize the transfer functions of the amplifiers so that the voltage swing of the ECL driver does not overly turn-off the transistors within the amplifiers, thereby improving response time.
REFERENCES:
patent: 3922570 (1975-11-01), Eguchi et al.
patent: 3968399 (1976-07-01), Jarrett
patent: 4485311 (1984-11-01), Goerne et al.
patent: 4571506 (1986-02-01), Lisco
patent: 4622477 (1986-11-01), Uda
Hewlett--Packard Company
Miller Stanley D.
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