BIOLOGICAL SENSOR

摘要

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 microcontroller that generates a driving signal, a light-emitting element that emits light in accordance with the driving signal, a light-receiving element that outputs a current detection signal based on an intensity of received light, and an amplifying circuit that converts the current detection signal into a voltage detection signal, amplifies an alternating current component of the voltage detection signal, and outputs an amplified detection signal. Furthermore, the microcontroller generates an offset signal that is applied to an offset circuit to offset the direct current component of the voltage detection signal and to obtain biological information by processing the amplified detection signal.

主权项

1. A biological sensor comprising:
a light-emitting element that emits light based on a driving signal; a light-receiving element that outputs a current detection signal based on an intensity of received light including light emitted by the light-emitting element; an amplifying circuit configured to convert the current detection signal into a voltage detection signal, amplify an alternating current component of the voltage detection signal, and output an amplified detection signal; and a microcontroller configured to:
generate the driving signal,generate an offset signal that is applied to a offset circuit coupled to the amplifying circuit to offset a direct current component of the voltage detection signal, andobtain biological information based on the amplified detection signal.