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
Administrable compositions
Provision of downlink packet access services to user equipment in spread spectrum communication network
Formulations, their use as or for producing dishwashing detergents and their production
Light emitting device and light emitting device package
Method for designing sunlight-reflection and heat-radiation multilayer film
Vehicle drive control system
  Randomly Featured Patents
Magnetic memory device having yoke layer, and manufacturing method
Object observing apparatus and method for adjusting the same
Device for printing receipts using two printing units, particularly on thermal paper, and related printing method
Self-calibrating direct conversion transmitter with converting/steering device
Automated sourcing of substrate microfabrication defects using defects signatures
Amine functional polymers as thickening agents
Circuit breaker remote closing operator
Apparatus and method for electro-optical packages that facilitate the coupling of optical cables to printed circuit boards
Golf club putter head