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
Visualization of information associated with applications in user interfaces
Display screen or portion thereof with animated graphical user interface
Method and system for remapping processing elements in a pipeline of a graphics processing unit
Parallel processing computer systems with reduced power consumption and methods for providing the same
Electrical terminal
Collaborative image capture
Storage system comprising multiple microprocessors and method for sharing processing in this storage system
  Randomly Featured Patents
Efficient service discovery for peer-to-peer networking devices
Ferroelectric chiral smectic liquid crystal composition and liquid crystal device using same
Microprocessor and apparatus for performing fast speculative pop operation from a stack memory cache
Objective lens driving device
Protective mat and method of making same
Saw
Multilayer ceramic capacitor
Position responsive switch
Portable apparatus and fastening device thereof
Arrangement for and method of projecting an image with pixel mapping