Wide dynamic range optical receivers
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United States of America Patent
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May 10, 1994
Grant Date -
N/A
app pub date -
Mar 5, 1993
filing date -
Mar 5, 1993
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A wide-dynamic range optical receiver amplifier is provided by using two separate amplifiers. The first amplifier is a low-impedance input, low-noise, high-gain amplifier, preferably a transresistance amplifier. An input resistor is chosen for the amplifier such that its resistance value is much greater than the input impedance of the first amplifier, resulting in insignificant change in input impedance when the first amplifier's output becomes saturated. A light-induced signal source is connected to the input resistor such that signal current from the light-induced signal source flows through the input resistor into the first amplifier input. A second high-input-impedance amplifier (preferably an FET-input buffer amp) is connected to receive the light induced signal source, either directly or through a resistive divider network. The difference in gain between the two amplifiers serves to extend the dynamic range of the optical receiver amplifier without switching input or feedback components, and without discontinuous response as the first amplifier becomes saturated. Other embodiments are directed to a further diode induced breakpoint, and to a front-end for a spot tracking system.
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