Resources Contact Us Home
Photoreceiver/amplifier circuit, optical pickup device, and optical disk device

Image Number 13 for United States Patent #7868702.

The subject invention provides a photoreceiver/amplifier circuit comprising a differential circuit including a differential transistor pair and a bias circuit; an active load; a feedback resistor for converting a photocurrent generated from a photodiode into a voltage; a reference resistor; and a compensation circuit. The resistance of the feedback resistor is greater than the resistance of the reference resistor. The compensation circuit supplies a compensation current from a junction between the feedback resistor and a non-inverting input terminal of the differential amplifier circuit, so as to cancel the difference between a voltage between terminals of the feedback resistor and a voltage between terminals of the reference resistor. This reduces noise and improves offset voltage characteristics. The present invention provides a photoreceiver/amplifier circuit ensuring noise reduction and desirable offset voltage characteristics.

  Recently Added Patents
Image processing apparatus, image printing apparatus and printing data generation method
Method of producing probabilities of being a template shape
Small molecule inhibitors of kynurenine-3-monooxygenase
Accessory sleeve
Process for recovering and recycling an acid catalyst
Pyridylphenyl compounds for inflammation and immune-related uses
Method, preprocessor, speech recognition system, and program product for extracting target speech by removing noise
  Randomly Featured Patents
Surgical knives for large, self-sealing corneal incisions coupled to a universal intraocular lens (IOL) injector
Ventilation grille
Method of shading using sample vectors
Multiple frequency band multiple standard transceiver
Microcapsules containing suspensions of biologically active compounds
Integrated gear constant velocity joint for all wheel drive
Tracking user access of a network management system
Elastomeric thimble
Methods for detecting pregnancy
Document scanner for scanning books