Photoelectric Conversion Device
AssigneeShimadzu Corporation
InventorShunsuke SAKAI
Life of this patent
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Abstract
A photoelectric conversion device includes an amplifier, a photodetector, a first resistor, a second resistor, a first switch, a first terminal, a second terminal, a second switch, a third switch, and a controller. In setting a gain of the amplifier to a second gain, the controller is configured to control the first switch and the third switch to a conducting state and control the second switch to a non-conducting state. In setting the gain of the amplifier to a first gain, the controller is configured to control the first switch and the third switch to the non-conducting state and control the second switch to the conducting state so as to set a potential at one end and a potential at the other end to be equal in the first switch.
Claims10
A photoelectric conversion device comprising:
- an amplifier including an inverting input terminal, a non-inverting input terminal, and an output terminal;
- a photodetector connected between the non-inverting input terminal and the inverting input terminal of the amplifier;
- a first resistor provided between the inverting input terminal and the output terminal of the amplifier to set a gain of the amplifier to a first gain;
- a second resistor provided between the inverting input terminal and the output terminal of the amplifier to set the gain of the amplifier to a second gain;
- a first switch comprising a semiconductor switch having one end connected to the second resistor and the other end connectable to the output terminal of the amplifier;
- a first terminal connected to the non-inverting input terminal of the amplifier to receive a reference potential;
- a second terminal that receives the reference potential;
- a second switch that allows connection between the other end of the first switch and the second terminal;
- a third switch that allows connection between the other end of the first switch and the output terminal of the amplifier;
- and
- a controller that controls the first switch, the second switch, and the third switch, wherein
- the controller is configured to control the first switch and the third switch to a conducting state and control the second switch to a non-conducting state in setting the gain of the amplifier to the second gain, and
- the controller is configured to control the first switch and the third switch to the non-conducting state and control the second switch to the conducting state to set a potential at the one end and a potential at the other end to be equal in the first switch, in setting the gain of the amplifier to the first gain.
Dependencies are inferred from the claim text.