A Loss Of Signal (LOS) circuit in an opto-electronic receiver circuit. The LOS circuit includes a current to voltage converter and a comparator circuit. The current to voltage circuit receives a current signal including a DC current signal component from a photodetector circuit included in the opto-electronic...http://www.google.de/patents/US6713749?utm_source=gb-gplus-sharePatent US6713749 - Monolithic loss-of-signal detect circuitry
