Square pulse optical transmission circuit
AssigneeSTMicroelectronics (Alps) SAS
InventorXavier Branca
Life of this patent
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Abstract
An optical emission circuit includes a power supply source and a regulation circuit coupled to control the power supply source. An optical source and a first switch are coupled in series to the power supply source. A square pulse signal source has an output coupled to a control input of the first switch. The square pulse signal source is configured to provide a square pulse signal. The regulation circuit regulates the current supplied by the power supply source according to a product of a peak current set point by a duty cycle of the square pulse signal.
Claims24
An optical emission circuit comprising:
- a power supply source;
- a regulation circuit coupled to control the power supply source;
- an optical source;
- a first switch, the optical source and the first switch being coupled in series to the power supply source;
- and
- a square pulse signal source having an output coupled to a control input of the first switch, the square pulse signal source configured to provide a square pulse signal at the output coupled to the control input of the first switch, wherein the regulation circuit is configured to regulate a current supplied by the power supply source according to a product of a peak current set point and a duty cycle of the square pulse signal.
An optical emission method, comprising:
- generating a square pulse signal;
- and
- using the square pulse signal to control a switch that applies a voltage to an optical source, a current in the optical source being regulated according to a product of a peak current set point and a duty cycle of the square pulse signal.
An electronic circuit comprising:
- a power supply source comprising a power input and a control input;
- a first switch having a current path between a first terminal and a second terminal, the first terminal configured to be coupled to an optical source and the second terminal being coupled to an output of the power supply source, a control input of the first switch being configured to receive a square pulse signal;
- and
- a regulation circuit coupled to the control input of the power supply source, wherein the regulation circuit is configured to regulate current supplied by the power supply source according to a product of a peak current set point and a duty cycle of the square pulse signal.
A circuit comprising:
- a power supply source comprising a power input and a control input;
- a regulation circuit coupled to the control input of the power supply source;
- a first switch having a current path between a first terminal and a second terminal, the first terminal configured to be coupled to an optical source and the second terminal being coupled to an output of the power supply source, a control input of the first switch being configured to receive a square pulse signal;
- a peak current set point source;
- a second switch having a control input configured to be coupled to receive the square pulse signal and a current path coupled between the peak current set point source and the regulation circuit;
- and
- a third switch having a control input configured to be coupled to receive an inverse of the square pulse signal and a current path coupled between a reference potential and the regulation circuit, wherein the current paths of the second and third switches are coupled in series between the peak current set point source and the reference potential, wherein the regulation circuit comprises a low-pass filter having an input coupled to a node between the second switch and the third switch.
Dependencies are inferred from the claim text.