Intersil Americas Inc.

Infineon Technologies North America Corp.

Elantec Semiconductor, Inc.

Yang Zhao

Barry Harvey

Theodore D Rees

Alexander Fairgrieve

Bill R Tang

John Brummer

Jeffrey A Schuler

Systems and methods for slow tail compensation are provided. A photodetector signal is pre-amplified to thereby produce an uncompensated photodetector signal that includes a fast component and a slow component. The fast component is removed from the uncompensated photodetector signal to thereby produce a compensating signal that includes the slow component of the uncompensated photodetector signal. The compensating signal is subtracted from the uncompensated photodetector signal to thereby produce a compensated photodetector signal that includes the fast component but not the slow component.

Slow tail compensation

Optical pick-up units and laser drivers are disclosed, which can be used in various types of information recording/reproducing apparatuses, such as, but not limited to, DVD and CD drives, DVD camcorders, and DVD video recorders. A laser driver integrated circuit (LDIC) includes an automatic power controller, a running optical power controller, and a write strategy generator. The LDIC can be part of a chip-set, to be located on an optical pick-up unit (OPU). The chip-set can also include a power monitor integrated circuit (PMIC) to monitor the laser diode, and a photo-detector integrated circuit (PDIC) to detect light produced by the laser diode. The PMIC and the PDIC each include their own offset, gain and sample-and-hold circuitry.

Optical pick-up units and laser drivers with increased functionality

Current-mode preamplifiers are provided. In accordance with an embodiment, a current-mode preamplifier includes a transistor, that acts as an input stage for the preamplifier, and a pair of current mirrors. The transistor includes a gate connected to the input of the preamplifier, a source connected to a first voltage supply rail, and a drain. The first current mirror, which is connected to a second voltage supply rail, includes an input connected to the drain of the first transistor, and an output. The second current mirror, which is connected to the first voltage supply rail, includes an input connected to the output of the first current mirror, a first output connected to the input of the preamplifier, and a second output connected to the output of the preamplifier.

Current-mode preamplifiers

Control circuitry for an array of light emitting devices includes a first column line connected to each light emitting device in a column of light emitting devices. First column circuitry includes a first current source and a second current source. The first current source is connected to the first column line. The second current source is connected to the first column line. When a first light emitting device from the column of light emitting devices is to be turned on, the first current source is turned on until a voltage on the first column line is equal to a predetermined voltage. Then the first current source is turned off and the second current source supplies current sufficient to cause the first light emitting device to emit light to a first brightness level.

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Fremont, CA, United States of America

Yang Zhao