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US 12,348,002 B2Granted
Current load-controlled laser driver
AssigneeII-Vi Delaware, Inc.
InventorsTheron Jones, Richard Davis, Brian Carey, Michael Yeung
Life of this patent
Estimating the term…
Abstract
Laser circuits are disclosed herein that include, in one example, a proxy laser drive cell and a proxy comparator circuit for deriving a laser driver bias control using one or more constant current supplies. Comparator circuits are disclosed that are adapted to generate an output based on a proxy voltage having first and second voltage components wherein one of the voltage components is developed based on one or more constant current supplies indicative of laser control current.
Claims19
A laser circuit comprising:
- a supply power bus adapted to provide a supply voltage;
- a first constant current supply;
- a second constant current supply;
- at least one laser drive cell in the current path of a laser, the laser drive cell comprising a driver bias control transistor adapted to regulate a laser current through the laser drive cell;
- at least one proxy laser drive cell, the proxy laser drive cell comprising a proxy driver control transistor adapted to regulate a proxy drive current through the proxy laser drive cell;
- a proxy comparator circuit comprising a first input, a second input, and an output, wherein the proxy comparator circuit is adapted to generate the output based on the difference between the first input and the second input, wherein the first and second constant current supplies establish a proxy voltage at the first input of the proxy comparator circuit;
- wherein the output of the proxy comparator circuit is electrically interfaced with the proxy laser drive cell such that the output of the proxy comparator circuit varies a current through the proxy laser drive cell;
- wherein a proxy gate control signal for the proxy laser drive cell is electrically interfaced to the driver bias control transistor.
5 more elements
Dependencies are inferred from the claim text.