Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Reexamination Certificate
2008-12-11
2011-10-04
Mai, Huy K (Department: 2873)
Radiant energy
Photocells; circuits and apparatus
Photocell controlled circuit
C250S370140, C250S393000, C327S336000
Reexamination Certificate
active
08030609
ABSTRACT:
A read circuit includes: an integration circuit section configured to perform an integral operation and whose input is connected to an integration node; and a bias circuit connected between a connection node to which a variable resistive element is connected and the integration node. The bias circuit includes: an integration transistor whose source and drain are respectively connected to the connection node and the integration node; an operational amplifier whose output is connected to a gate of the integration transistor, to whose first input a bias voltage is supplied, and whose second input is connected to the source of the integration transistor; and at least one diode element that is connected between the gate and source of the integration transistor and clips a gate-source voltage of the integration transistor.
REFERENCES:
patent: 5646573 (1997-07-01), Bayruns et al.
patent: 5965892 (1999-10-01), Tanaka
patent: 7183531 (2007-02-01), Olsen et al.
patent: 2009/0167406 (2009-07-01), Endo
patent: 3821040 (2006-06-01), None
patent: 2007-33177 (2007-02-01), None
Mai Huy K
McGinn IP Law Group PLLC
Renesas Electronics Corporation
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