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
Bicycle carrier
Electromagnetic shield for a passive electronic component in an active medical device implantable lead
High surface area composition for use in the catalytic hydroconversion of a heavy hydrocarbon feedstock, a method making such composition and its use
System and method of verification of analog circuits
Polymer composites having highly dispersed carbon nanotubes
Power conversion device and method for controlling thereof
Interface circuit and interface system
  Randomly Featured Patents
Reactor for catalytic gas phase oxidation
Computer system and process for efficient processing of a page description using a display list
Higher secondary alcohol alkoxylate compound composition, method for production thereof, and detergent and emulsifier using the composition
Hunting spear
Electronic device power management system and method
Semiconductor wafer polishing apparatus with a variable polishing force wafer carrier head
Windshield washer apparatus
Light bulb socket holder
Radio frequency (RF) receiver with double loop integrated fast response automatic gain control (AGC)
Acousto-optic tunable apparatus having a fiber bragg grating and an offset core