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

Details Photoreceiver/amplifier circuit, optical pickup device, and... Photoreceiver/amplifier circuit, optical pickup device, and...

2011-01-11

2011-01-11

Nguyen, Khanh V (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including atomic particle or radiant energy impinging on a...

Reexamination Certificate

active

07868702

ABSTRACT:
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.

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patent: 2002/0011878 (2002-01-01), Kadowaki
patent: 2006/0006312 (2006-01-01), Kiji
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patent: 2005-244864 (2005-09-01), None
patent: 2006-25377 (2006-01-01), None

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