Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
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
Motion compensated overlay
Stage drive method and stage unit, exposure apparatus, and device manufacturing method
Compositions of quaternary ammonium compounds containing bioavailability enhancers
Lithographic apparatus and device manufacturing method
Apparatus and method for manufacturing microneedles
Gaze tracking password input method and device utilizing the same
Data center management unit with improved disaster prevention and recovery
  Randomly Featured Patents
System function configurable computing platform
Imaging tray with medium disposed therein for ratiometric determination of object shape
Ferritin analogs
Programming verification method of nonvolatile memory cell, semiconductor memory device, and portable electronic apparatus having the semiconductor memory device
Integrated injection logic with floating reinjectors
Antivibration rubber composition
Device for transmission between a primary motor shaft and an output shaft and lawn mower comprising such a device
Process for the continuous dyeing of poly(m-phenylene-isophthalamide) fibers
Methods of detecting ovarian cancer
Aquatic vehicle