阅读说明：本技术 用于光学监测系统的电路装置和用于光学监测的方法 (Circuit arrangement for an optical monitoring system and method for optical monitoring ) 是由 彼得·特拉蒂勒 卡尔·格奥尔格·瓦泽 赫伯特·伦哈德 于 2018-05-15 设计创作，主要内容包括：一种用于光学检测系统的电路装置包括驱动器电路(DRV),所述驱动器电路配置为生成至少一个驱动信号以用于驱动光源(LS)。检测器端子(DT)设置成用于从光学检测器(OD)接收检测器电流(Id)。增益级(GS)在其输入侧处连接到驱动器电路(DRV),用于接收驱动信号并且根据驱动信号生成噪声信号。处理单元(PU)配置为根据检测器电流(Id)和噪声信号生成输出信号(SO)。(A circuit arrangement for an optical detection system comprises a driver circuit (DRV) configured to generate at least one drive signal for driving a Light Source (LS). The Detector Terminal (DT) is arranged for receiving a detector current (Id) from the Optical Detector (OD). The Gain Stage (GS) is connected at its input side to the driver circuit (DRV) for receiving the drive signal and generating a noise signal from the drive signal. The Processing Unit (PU) is configured to generate an output Signal (SO) from the detector current (Id) and the noise signal.)

1. A circuit arrangement for an optical monitoring system, comprising:

a driver circuit (DRV) configured to generate at least one drive signal for driving the Light Source (LS),

a Detector Terminal (DT) for receiving a detector current (Id) from an Optical Detector (OD),

-a Gain Stage (GS) connected at its input side to the driver circuit (DRV) for receiving the drive signal and generating a noise signal from the drive signal,

-a Processing Unit (PU) configured to generate an output Signal (SO) from the detector current (Id) and the noise signal.

2. Circuit arrangement according to claim 1, wherein the Processing Unit (PU) comprises:

-an Amplifier Circuit (AC) having an input side connected to the Detector Terminal (DT),

-a demodulation and signal processing unit (DPU) connected to an output side of the Amplifier Circuit (AC), an

-an analog-to-digital converter (ADC) connected to an output side of the demodulation and signal processing unit (DPU).

3. The circuit arrangement of claim 2,

-the Amplifier Circuit (AC) is implemented and connected as a transimpedance amplifier having a first input connected to the Detector Terminal (DT) and having a second input connected to a reference terminal, and

-said demodulation and signal processing unit (DPU) comprises an optical first band-pass filter (BP1), a synchronous Demodulator (DM) and a second band-pass filter (BP2) connected in series.

4. A circuit arrangement as claimed in one of claims 1 to 3, wherein the Gain Stage (GS) comprises a chopper amplifier or a differential amplifier.

5. Circuit arrangement according to one of claims 2 to 4,

-is provided with a reference generator (RF) generating a reference signal having a known frequency and phase,

-the drive circuit (DRV) comprises a Control Input (CI) connected to the reference generator (RF), and

-said demodulation and signal processing unit (DPU) comprises a Signal Input (SI) connected to said reference generator (RF).

6. The circuit arrangement of claim 5,

-a signal and hold switch (S/H) is connected between the drive circuit (DRV) and the input side of the Gain Stage (GS), and

-a Switch Control Input (SCI) is coupled with said demodulation and signal processing unit (DPU), said reference generator (RF) and said Control Input (CI).

7. Circuit arrangement according to one of claims 2 to 6, wherein the output side of the Gain Stage (GS) is connected to a Reference Input (RI) of the analog-to-digital converter (ADC) to receive the noise signal as a reference for the analog-to-digital converter (ADC).

8. Circuit arrangement according to one of claims 2 to 6,

-a first input selection switch (IS1) IS coupled between the demodulation and signal processing unit (DPU) and the analog-to-digital converter (ADC),

-wherein in a first switching state, the first input selection switch (IS1) electrically connects the demodulation and signal processing unit (DPU) with the analog-to-digital converter (ADC), and

-wherein in a second switching state, the first input selection switch (IS1) electrically connects the Gain Stage (GS) with the analog-to-digital converter (ADC).

9. The circuit arrangement of claim 8,

-a second input selection switch (IS2) IS coupled between the signal and hold switch (S/H) and the Gain Stage (GS),

-wherein in a third switching state, the second input selection switch (IS2) electrically connects the driver circuit (DRV) with the Gain Stage (GS), and

-wherein in a fourth switching state the second input selection switch (IS2) electrically connects the reference potential (GND) with the Gain Stage (GS).

10. The circuit arrangement of claim 9,

-a control and processing unit (CU) IS connected with an output side of the analog-to-digital converter (ADC) and IS coupled to the first and/or second input selection switch (IS1, IS2), and wherein,

-said control and processing unit IS arranged to control the switching state of said first and/or second switch (IS1, IS 2).

11. Circuit arrangement according to one of the claims 1 to 10, further comprising the Light Source (LS), wherein the Light Source (LS) comprises at least one optical emitter configured and arranged to be driven by the at least one driving signal.

12. Circuit arrangement according to one of claims 1 to 11, further comprising the Optical Detector (OD).

13. Circuit arrangement according to one of claims 1 to 12, wherein the output Signal (SO) is a photoplethysmogram, PPG, signal or a signal suitable for generating a PPG signal.

14. Circuit arrangement according to one of claims 1 to 13, wherein the Gain Stage (GS) is an analog gain stage.

15. A method for optical monitoring, the method comprising the steps of:

-generating at least one drive signal for driving the Light Source (LS),

-receiving a detector current (Id) from an Optical Detector (OD),

-generating a noise signal from the at least one drive signal, an

-generating an output Signal (SO) from a combination of the detector current (Id) and the noise signal.

16. The method for optical monitoring of claim 15, wherein the noise signal is an analog signal.

17. The method of claim 15 or 16, further comprising:

-irradiating a target area of an object (O) by light emitted by the Light Source (LS),

-detecting a portion of light reflected from the target area and/or an area of the object (O) adjacent to the target area and/or a portion of light transmitted by the target area and/or an area of the object (O) adjacent to the target area, and

-generating the detector current (Id) based on a portion of the detected light.