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
Trash bag retention device
Active matrix substrate, method for manufacturing same, and liquid crystal display apparatus
Methods and devices for rapid and specific detection of multiple proteins
Medicament container
Distortion estimation for quantized data
Color image display device, color filter substrate, color pixel array substrate, and electronic device
Semiconductor device having a first conductive member connecting a chip to a wiring board pad and a second conductive member connecting the wiring board pad to a land on an insulator covering
  Randomly Featured Patents
Drum brake device
Rotor bush assembly in fluid machines
High pressure liquid installation
Optimum structure for single-sides PCB with SMD LEDs for the express card
Process and activated carbon catalyst for ring-opening polymerization of lactone compounds
Controlled shot peening
Process for developing light-sensitive silver halide photographic materials
Stepwise formation of channel walls in honeycomb structures
Method and system for monitoring hydration
Xenon lamps having enhanced light output and elliptical envelope