Back to results
US 4,139,767 AGranted
Photodetector with improved signal-to-noise ratio
AssigneeNorthern Telecom Limited
InventorTadeusz Witkowicz
Life of this patent
Estimating the term…
Abstract
A novel photodetector circuit utilizing both the generated photovoltage, as well as its inverse, to improve the signal-to-noise ratio at the optical receiver output.
Claims2
A photodetector/receiver circuit comprising:
- a voltage source having a positive and a negative terminal;
- a first resistor connected between said positive terminal and the cathode of a photodetector diode;
- a second resistor substantially equal in resistance value to said first resistor, connected between said negative terminal and the anode of said photodetector diode;
- said anode and cathode capacitively coupled, one to the inverting input of a differential amplifier, and the other to the noninverting input;
- and
- the output of said differential amplifier comprising the output of said photodetector/receiver circuit.
3 more elements
Dependencies are inferred from the claim text.