Patent ID: 6590687
Filing Date: 2003-07-08
Classification: H04B

Abstract:
A circuit for receiving optical pulses containing pulse width modulated digital information, the circuit comprising:a device for generating electronic pulses responsive to the digital information, the width of the electronic pulses being responsive to the width of the received optical pulses and having either a first width or a second width which is responsive to a first logic level in digital information and a second logic level in the digital information, respectively; a Schmitt trigger which compares the electronic pulses to a reference voltage that is a percentage of the power supply voltage and passes the electronic pulses to a first inverter and a second inverter; wherein the first inverter inverts and passes the electronic pulses to a Data input of a Flip-Flop circuit and to an RC network that controls the reset of the Flip-Flop circuit, and the second inverter inverts and passes the electronic pulses to the Clock input of the Flip-Flop circuit after a time delay determined by an RC network coupled to an input to the second inverter, the time delay being such that pulses having a first width cause a first logic level to be clocked into the Flip-Flop and pulses having a second width cause a second logic level to be reset into the Flip-Flop.