BIOLOGICAL SENSOR
First Claim
1. A biological sensor comprising:
- a driving signal generator that generates a driving signal;
a light-emitting element that emits light in response to the driving signal;
a light-receiving element that outputs a detection signal based on an intensity of received light;
an amplifying circuit that includes at least one amplifier and that receives and amplifies the detection signal outputted from the light-receiving element;
an offset generator circuit that generates an offset voltage that is applied to the at least one amplifier to offset a reference potential of the at least one amplifier; and
a controller configured to process the amplified detection signal to obtain biological information.
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Accused Products
Abstract
A biological sensor capable of improving the signal-to-noise ratio of a detection signal obtained by a light-receiving element and amplified by an amplifier is provided.
The biological sensor includes a driving signal generating unit that generates a pulse-form driving signal, a light-emitting element that emits light in response to the generated driving signal, a light-receiving element that outputs a detection signal based on an intensity of received light, an amplifying unit including first and second operational amplifiers that amplify the outputted detection signal, an offset signal generating unit and a voltage dividing resistor group that generate a pulse-form offset voltage for offsetting a reference potential of the first operational amplifier when amplifying the detection signal and apply the offset voltage to the first operational amplifier, and a computation unit that obtains biological information by processing the detection signal amplified by the amplifying unit.
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Citations
20 Claims
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1. A biological sensor comprising:
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a driving signal generator that generates a driving signal; a light-emitting element that emits light in response to the driving signal; a light-receiving element that outputs a detection signal based on an intensity of received light; an amplifying circuit that includes at least one amplifier and that receives and amplifies the detection signal outputted from the light-receiving element; an offset generator circuit that generates an offset voltage that is applied to the at least one amplifier to offset a reference potential of the at least one amplifier; and a controller configured to process the amplified detection signal to obtain biological information. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for obtaining biological information, the method comprising:
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generating a driving signal; emitting light from a light-emitting element in response to the driving signal; detecting an intensity of received light by a light-receiving element and outputting a detection signal based on the intensity of received light; amplifying, by at least one amplifier, the detection signal outputted from the light-receiving element; generating an offset voltage and applying the offset voltage to the at least one amplifier to offset a reference potential of the at least one amplifier; and processing the amplified detection signal to obtain biological information. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification