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
Process to extract quassinoids
System for collecting computer application usage data of targeted application programs executed on a plurality of client devices
Semiconductor memory device and manufacturing method thereof
System and method for broadcasting rich media to devices over multiple carriers
Electronic component
Managing a spinlock indicative of exclusive access to a system resource
  Randomly Featured Patents
Method for identifying faces in images with improved accuracy using compressed feature vectors
Method and apparatus for flexible battery for implantable device
Operating apparatus for automatic transmission
Plastic bottle forming machine with modular design
Process for preparing surface-active glycosides and the use of the glycosides in cosmetic, pharmaceutical and household products
Cleaning device having cleaning agent provided therein
Auger dewatering system
Eyewear front
Specimen observation apparatus including an optical microscope and a scanning electron microscope
Selective suspension of bus devices