Optical time domain reflectometer and current voltage converter

Details Optical time domain reflectometer and current voltage converter Optical time domain reflectometer and current voltage converter

1990-12-07

1992-06-23

McGraw, Vincent P.

Optics: measuring and testing

For optical fiber or waveguide inspection

307311, 307565, G01N 2188, H03K 342

Patent

active

051237326

ABSTRACT:
The invention provides a current-voltage converter comprising: an input port, amplifying means comprising an inverting amplifier (U1) having an inverting input terminal and an output terminal, the output terminal being coupled to the input port of the current-voltage converter via a resistor (RF). The invention is characterized in that a voltage clipping means is connected between the input port of the current-voltage converter and a fixed potential, that the inverting amplifier (U1) has a gain such that the maximum of the output voltage (U0) of a specific polarity of the inverting amplifier (U1) is the product of the gain of the current-voltage converter and the corresponding maximum voltage across the clipping means. Thus, saturation of the inverting amplifier can be avoided.

REFERENCES:
patent: 3440557 (1969-04-01), Sundeen, Jr.
patent: 3968361 (1976-07-01), Bumgardner
patent: 4218613 (1980-08-01), Bletz
patent: 4578576 (1986-03-01), Wheeler et al.
patent: 4960989 (1990-10-01), Liebenrood et al.
patent: 5023951 (1991-06-01), Kahn

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