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Photoreceiver/amplifier circuit, optical pickup device, and optical disk device

  • US 7,868,702 B2
  • Filed: 09/26/2007
  • Issued: 01/11/2011
  • Est. Priority Date: 09/27/2006
  • Status: Expired due to Fees
First Claim
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1. A photoreceiver/amplifier circuit comprising:

  • an optical receiver;

    a feedback resistor;

    a reference resistor;

    a differential circuit including a differential transistor pair made up of a first transistor having a base connected to the optical receiver and to the feedback resistor, and a second transistor having a base supplied with an external reference potential via the reference resistor; and

    compensating means for compensating a difference between voltage between terminals of the feedback resistor and a voltage between terminals of the reference resistor,wherein a resistance of the feedback resistor is greater than a resistance of the reference resistor, andwherein the compensating means serves as a current source for supplying a compensation current to a junction between the reference resistor and the base of the second transistor, for compensating the difference.

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