Patent · US Active

High compliance laser driver circuit

US9025629B2 · kind B2 · utility

0Cited by

1References

16Claims

0Family size

Assignee

Micrel, Inc. · US

Inventors

Bernd Neumann · Radevormwald, DE
Dieter Kuehnel · Frankfurt, DE
Maik Pohland · Frankfurt, DE

Key dates

Filing date	Dec 3, 2012
Grant date	May 5, 2015
Priority date	—
Expiry date	Apr 19, 2033

Classification

Technology area (CPC H)Electricity
CPC primaryH01S5/06808
WIPO fieldOptics
WIPO sectorInstruments

Abstract

A laser driver circuit having a differential circuit and an output circuit includes a control circuit receiving a regulated supply voltage that also supplies the differential circuit as an input signal. The control circuit generates a feedback voltage across a first resistor to cause a first current to flow in the first resistor having a current value equal or proportional to the modulation current value. The laser driver circuit includes an operational amplifier receiving the feedback voltage and a reference voltage indicative of a desired modulation current value and to generate the regulated supply voltage. The control circuit and the operational amplifier form a feedback control loop to adjust the regulated supply voltage to regulate the feedback voltage to be equal to the reference voltage, thereby regulating the modulation current value to the desired modulation current value.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.