Light source driver circuit that uses a low supply voltage and is capable of operating at a high bandwidth
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United States of America Patent
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Oct 22, 2019
Grant Date -
Aug 30, 2018
app pub date -
Feb 28, 2017
filing date -
Feb 28, 2017
priority date (Note) -
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Abstract
A light source driver circuit is provided that has at least first and second current source circuits that are electrically coupled to a node of the driver circuit. The first and second current source circuits source first and second fractions, respectively, of a total current needed to drive a light source into a node of the driver circuit. The driver circuit uses a sum of the first and second fractions of the total current in combination with a modulation current to drive the light source. By incorporating at least first and second current source circuits into the driver circuit, each of the current sources can be kept sufficiently small in size that they contribute very little parasitic capacitance, and therefore allow the driver circuit to achieve high-bandwidth operations while also allowing the driver circuit to operate at a low supply voltage.
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