Digital current source is nonvolatile


Posted on Sep 18, 2012

Digitally programmable current sources that feature automatic trimming and retain the setting despite power-down cycles are useful in applications such as RF- and laser-communications drivers. The circuit in Figure 1, for example, is particularly suited for setting the drive current for the optical pump in widely tunable VCSELs (vertical-cavity surface-emitting lasers). These lasers are suitable in systems using wavelength-agile DWDM fiber-optic communication links.






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