Method and apparatus for providing a modulation current

Details Method and apparatus for providing a modulation current Method and apparatus for providing a modulation current

2006-12-26

2006-12-26

Mis, David (Department: 2817)

Coherent light generators

Particular beam control device

Having particular beam control circuit component

C372S029011, C327S108000, C327S109000, C332S106000, C332S107000

Reexamination Certificate

active

07154923

ABSTRACT:
Techniques are disclosed for providing modulation current that includes output impedance compensation with a feed-forward bandwidth enhancement and pre-distortion modulation to control waveform transition symmetry. A feedback circuit senses output node voltage and increases the overdrive voltage of a current source. This offsets the loss of current due to channel length modulation and increases the effective output impedance of the source. A feed-forward circuit enhances the bandwidth of the impedance compensation feedback loop. Waveform transition symmetry is improved by pre-distorting a laser modulation current by introducing an undershoot current on the falling edge of the modulating current.

REFERENCES:
patent: 6373346 (2002-04-01), Kobayashi
patent: 6389050 (2002-05-01), Stronczer
patent: 6891866 (2005-05-01), Robinson et al.

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