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
Tool box
Picture quality control method and image display using same
Rim for a TV receiver
Hybrid asynchronous transmission process
Dyes and methods of marking biological material
Zoom lens
Method and apparatus for allocating and obtaining IP address
  Randomly Featured Patents
Method and apparatus for implementing a search selection tool on a browser
Method and apparatus for increasing charitable donations by providing instantaneous donor recognition
Slider for slide fastener with automatic stopper
Golf club including turf repair tool
Method for manufacturing semiconductor package
Full extension lock for prosthetic knee joint
Providing a trusted platform module in a hypervisor environment
Multi-layered unit including electrode and dielectric layer
Directional image transmission sheet and method of making same
Surgical suturing instrument