Data drivers
AssigneeSemtech Corporation
InventorBehzad Farzaneh
Life of this patent
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Abstract
This application relates to data driver circuits, in particular to laser drivers. A driver is configured to receive an input signal and generate a corresponding driver output signal for driving an output device, such as a laser. A bias generator has a first output branch connected to an output node of the bias generator and a first control loop is configured to control a current in the first output branch to have a defined relationship to a bandgap referred current to provide a first bias current for biasing the output device. A driver output node is coupled to the driver and also to the output node of the bias generator, for outputting the driver output signal and the first bias current to the output device.
Claims20
A driver circuit comprising:
- a driver configured to receive an input signal and generate a driver output signal that corresponds to the received input signal for driving an output device;
- a bias generator comprising a first output branch connected to an output node of the bias generator, wherein a first control loop is configured to control a current in the first output branch to have a defined relationship to a bandgap referred current to provide a first bias current for biasing the output device;
- and
- a driver output node coupled to the driver and to the output node of the bias generator for outputting the driver output signal and the first bias current to the output device.
A driver circuit comprising:
- a driver configured to receive an input signal and generate a driver output signal that corresponds to the received input signal for driving an output device;
- a bias generator comprising a first control loop configured to control a current in a first output branch to provide a first temperature stable bias current for biasing the output device, and
- a driver output node coupled to the driver and to the output node of the bias generator for outputting the driver output signal and the first bias current to the output device;
- wherein the first control loop has a bandwidth such that first output branch acts as a termination impedance for the driver output signal at a modulation frequency of the driver output signal.
Dependencies are inferred from the claim text.