Optical receiver signal strength indicator (RSSI) circuit having a variable supply voltage filter impedance
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United States of America Patent
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Jan 30, 2018
Grant Date -
Feb 2, 2017
app pub date -
Jul 28, 2015
filing date -
Jul 28, 2015
priority date (Note) -
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Abstract
An optical receiver signal strength indicator (RSSI) circuit for use in an optical receiver or transceiver module is provided that uses a variable impedance device in the supply voltage filter circuit. The variable impedance device is varied based on the strength of the input current signal produced by the photodiode. At lower values of input current, the variable impedance is increased to improve the accuracy with which the RSSI circuit senses the input current, which improves the accuracy of the RSSI signal output from the RSSI circuit. The increase in impedance also improves supply voltage filtering by reducing the low-pass bandwidth of the supply voltage filter circuit. At higher values of input current, the variable impedance is decreased to ensure that the voltage bias applied to the photodiode is at least equal to a minimum bias voltage needed for proper operation of the photodiode.
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