Photoelectric detection equipment and integrated circuits

Abstract

Disclosed is a photoelectric detection device and an integrated circuit. The photoelectric detection device includes a light-emitting component for emitting light signals; a drive circuit for driving the light-emitting component to emit light; a photoelectric conversion circuit for Generate a photocurrent signal; an isolation circuit, used to transmit the photocurrent signal in an isolated manner; an ambient light filtering circuit, used to filter out a current component corresponding to ambient light in the photocurrent signal and output a net photocurrent signal; an amplification unit, for amplifying the net photocurrent signal and outputting an amplified photocurrent signal; an analog-to-digital converter, for converting the amplified photocurrent signal into a digital signal; and a control circuit, for converting the amplified photocurrent signal into a digital signal; The signal output is a photoelectric detection signal. The circuit structure of the photoelectric detection device of the present invention is suitable for integration, can reduce the circuit size of the device, and at the same time, can operate with relatively small power and has high detection accuracy.

Description

technical field [0001] The invention relates to sensing and circuit technology, in particular to a photoelectric detection device and an integrated circuit used for the photoelectric detection device. Background technique [0002] A photoelectric sensor is a sensor that uses a photoelectric element as a detection element. It first converts the measured changes into changes in optical signals, and then further converts the optical signals into electrical signals with the help of photoelectric elements. Photoelectric sensors are widely used in heart rate detection devices. [0003] The heart rate detection sensor can detect a person's heart rate, and people can judge their own health status by detecting the current heart rate value. The contraction and expansion of the heart make the blood flow in the blood vessels in a wave shape, and the amount of blood flowing through the blood vessels has different reflectivity to light. The heart rate detection sensor calculates the cur...

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Problems solved by technology

The power consumption driven by the light-emitting device integrated in the chip is the main power consumption of the heart rate detection sensor, but the intensity and light-emitting time of the light emitted by the light-emitting device directly affect the amplitude of the light signal received by the photoelectric conversion circuit. The resolution is directly limited by the resolution of the integral digital-to-analog converter, which in turn affects the output of the sensor, so the light emitted by the light-emitting device should not be too weak, and the time should not be too short, so the power consumption will be relatively high

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