High Efficiency Laser Drive Apparatus
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United States of America Patent
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Issued Date -
Apr 7, 2011
app pub date -
Oct 6, 2009
filing date -
Oct 6, 2009
priority date (Note) -
Abandoned
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Abstract
A laser drive apparatus includes a plurality of transistors coupled to different power supply voltages. A control circuit selects one of the plurality of transistors to drive a light source. The control circuit also determines a pulse width to drive the selected transistor. A calibration feedback circuit may be used to calibrate power supplies that provide the different power supply voltages. A dither circuit may be used to reduce the number of bits received by the control circuit.
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