Spectronics Corporation

Ben R Elmer

James Robert Biard

A data transmission link including a transmitter for acquiring conducted electrical data and transmitting electromagnetic radiated wave data such as optical data corresponding to the conducted electrical data, a receiver for receiving the electromagnetic radiated wave data and generating conducted electrical data corresponding to the radiated wave data and at least one wave conduit such as fiber optic data transmission cable for transmitting the radiated wave data from the transmitter to the receiver is disclosed. In one arrangement, the transmitter includes a light emitting device which is driven by an output driver responsive to the electrical data accepted by an input gate. In an optical data transmission link, the receiver includes a preamplifier for receiving optical data and generating bipolar electrical signal data corresponding to the optical data, a postamplifier for amplifying the bipolar conducted electrical data generated by the preamplifier, and an output stage for acquiring the amplified bipolar electrical data from the postamplifier and generating single-ended conducted electrical data corresponding to the bipolar electrical data. The optical data transmission link includes a temperature compensated voltage reference circuit to accommodate the use of the link from -55.degree. C. to +150.degree. C. and in the range of power supply voltage from ten percent below the nominal supply voltage to ten percent above the nominal supply voltage. Both logic circuitry and linear circuitry are included on the same chip. Special features and methods lower the noise of the circuit, compensate for temperature variations, and obviate the problem of distributed electrical capacitance to ground to make an electrical element in a monolithic or hybrid circuit act similar to a discrete electrical element.

Data transmission link

A differential stage of an amplifier includes an input transistor and a second transistor with a significantly greater emitter cross-sectional area than the input transistor. Quiescent emitter current is divided between the two transistors in substantially the same ratio as the emitter cross-sectional areas so that the emitter current densities are substantially equal.

Apparatus for input amplifier stage

A method and apparatus for altering the apparent electrical characteristic of a distributed electrical component in an integrated circuit is disclosed. In one form a distributed load resistor is sunk into a parallel distributed guard resistor. The mutual distributed capacitance between the distributed load resistor and the parallel distributed guard resistor is substantially greater than the distributed capacitance between the distributed load resistor and any other electrical component. A follower circuit for driving the voltage across the parallel distributed guard resistor by the voltage across the distributed load resistor is provided.

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Plano, TX, United States of America

Ben R Elmer