Amplifier for optical sensor, optical sensor and optical sensor equipment

Abstract

The invention relates to the technical field of optical sensors, and discloses an amplifier for an optical sensor, the optical sensor and optical sensor equipment. The amplifier for the optical sensor comprises a transimpedance amplifier which converts photocurrent generated by sensing light of a photodiode into voltage and amplifies the voltage to obtain first-stage voltage; the voltage amplifier comprises an operational amplifier and a fusion type feedback resistance network circuit which are connected in parallel, and the operational amplifier amplifies the first-stage voltage to obtain a second-stage voltage; the sensing measurement circuit is used for obtaining the second-stage voltage, obtaining a measurement voltage value and determining a voltage compensation value based on the measurement voltage value; and the fusion type feedback resistance network circuit determines a feedback resistance value corresponding to the voltage compensation value through a fusion control mode based on the voltage compensation value, and feeds back the feedback resistance value to the input end of the operational amplifier so as to adjust the amplification degree of the operational amplifier. Therefore, the amplification degree and the sensitivity change caused by the change of the manufacturing process are minimized, and the stability of the optical sensor in sensitive application is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of optical sensors, and in particular to an amplifier for an optical sensor, an optical sensor and an optical sensor device. Background Art

[0002] In the existing optical sensor structure, the optical sensor includes a photodiode and a signal amplifier. The photodiode receives the optical signal and converts it into a photocurrent. However, the converted photocurrent is a weak signal. At this time, a signal amplifier is needed to convert the converted photocurrent into a voltage and amplify it. The signal amplifier is generally composed of a transimpedance amplifier (TIA) and at least one level of voltage amplifier (Voltage Amplifier). In the first stage, the transimpedance amplifier uses a transimpedance resistor (Trans Impedance Resistor) to convert the photocurrent into a voltage; in the second stage, the voltage amplifier uses an operational amplifier (OPAMP) and a feedback resistor (Feedback Resisitor) to adjust the voltage amplification to the required voltage value.

[0003] When a transimpedance amplifier is used in the first stage, since the amplification of the transimpedance amplifier appears directly in the resistance value itself, if the sheet resistance value of the resistor changes during the manufacturing process, the amplification will also change accordingly (for example, if the sheet resistance value of the resistor changes by + / -20% during the manufacturing process, the amplification of the transimpedance amplifier will also cause a + / -20% deviation), which will cause the amplification of the light sensor and the sensitivity of the light sensor to change, which will bring potential fatal errors in sensitive applications. Summary of the invention

[0004] The embodiments of the present invention aim to provide an amplifier for a light sensor, a light sensor and a light sensor device, which can solve the problem that the amplification and sensitivity of the light sensor change due to inevitable deviations in the manufacturing process of the existing light sensor, resulting in potential fatal errors in sensitive applications.

[0005] In order to solve the above technical problems, the first aspect of the present invention provides an amplifier for a light sensor, comprising a transimpedance amplifier, a voltage amplifier and a sensing measurement circuit connected in sequence; wherein:

[0006] The transimpedance amplifier is used to convert the photocurrent generated by the photodiode sensing light into a voltage, and perform a first-stage amplification on the converted voltage to obtain a first-stage voltage;

[0007] The voltage amplifier includes an operational amplifier and a fused feedback resistor network circuit connected in parallel to the operational amplifier, wherein the input end of the operational amplifier is connected to the output end of the transimpedance amplifier, and is used to perform a second-stage amplification on the first-stage voltage to obtain a second-stage voltage;

[0008] The input end of the sensing measurement circuit is connected to the output end of the operational amplifier, and is used to obtain the second stage voltage, obtain a measured voltage value, and determine a voltage compensation value for compensating the operational amplifier based on the measured voltage value;

[0009] The fused feedback resistor network circuit is connected to the output end of the sensing measurement circuit, and is used to determine the feedback resistance value corresponding to the voltage compensation value through a fused control method based on the voltage compensation value, and feed it back to the input end of the operational amplifier to adjust the amplification of the operational amplifier.

[0010] Optionally, the first input terminal of the transimpedance amplifier is connected to the cathode of the photodiode, the second input terminal of the transimpedance amplifier is connected to the anode of the photodiode, and the output terminal of the transimpedance amplifier is connected to the input terminal of the operational amplifier.

[0011] Optionally, the sensing measurement circuit is used to obtain the second-stage voltage, obtain a measured voltage value, and determine a voltage compensation value for compensating the operational amplifier based on the measured voltage value, including: connecting the input end of the sensing measurement circuit to the output end of the operational amplifier, obtaining the second-stage voltage output by the operational amplifier, obtaining a measured voltage value, and comparing the measured voltage value with a standard output voltage value of the voltage amplifier, the difference between the measured voltage value and the standard output voltage value is the voltage compensation value.

[0012] Optionally, the fused feedback resistor network circuit includes a plurality of fused switches and a plurality of feedback resistors connected in sequence, one fused switch is connected in parallel with one feedback resistor respectively, and the fused switch determines whether the feedback resistor connected in parallel with it is connected to the fused feedback resistor network circuit.

[0013] Optionally, the fusion switch determines whether the feedback resistor connected in parallel therewith is connected to the fusion type feedback resistor network circuit, including:

[0014] When the fusion switch is closed, the feedback resistor connected in parallel with it is short-circuited, and the fusion-type feedback resistor network circuit is not connected;

[0015] When the fusion switch is disconnected, the feedback resistor connected in parallel with it is connected to the fusion type feedback resistor network circuit; when the feedback resistor connected to the fusion type feedback resistor network circuit is determined, the sum of the resistance values ​​of all the feedback resistors connected to the fusion type feedback resistor network circuit is the feedback resistance value of the fusion type feedback resistor network circuit.

[0016] Optionally, the fused feedback resistor network circuit is connected to the output end of the sensing measurement circuit, and is used to determine the feedback resistor value corresponding to the voltage compensation value by a fused control method based on the voltage compensation value, including:

[0017] Determining the degree of change of the amplification of the transimpedance amplifier within the resistance value change range according to the amplification of the transimpedance amplifier of the optical sensor and the voltage compensation value;

[0018] Based on the degree of change of the amplification of the transimpedance amplifier within the resistance value change range, determining the resistance value of the amplification compensation range of the voltage amplifier in the brown voltage amplifier;

[0019] According to the resistance value of the amplification compensation range, at least one feedback resistor with a resistance value equivalent to the amplification compensation range is selected from a plurality of feedback resistors connected in sequence, the selected feedback resistor is disconnected through the fusion switch connected in parallel with the feedback resistor, and the selected feedback resistor is connected to the fusion type feedback resistor network circuit, and the sum of the resistance values ​​of all the feedback resistors connected to the fusion type feedback resistor network circuit is the feedback resistance value of the fusion type feedback resistor network circuit.

[0020] Correspondingly, the second aspect of the present invention provides a light sensor having a built-in diode, wherein the diode is used to sense light and generate a photocurrent output; the light sensor also includes the light sensor amplifier described in the first aspect of the present invention, wherein the light sensor amplifier is connected to the photodiode and is used to convert the photocurrent output by the photodiode into a voltage and amplify the voltage, and adjust the amplification of the light sensor amplifier using a melting control method based on the amplified voltage.

[0021] Correspondingly, a third embodiment of the present invention provides a light sensor device, including the light sensor described in the second embodiment of the present invention.

[0022] Compared with the prior art, the present invention provides an amplifier for a light sensor, a light sensor and a light sensor device. The amplifier for the light sensor includes a transimpedance amplifier, a voltage amplifier and a sensing measurement circuit connected in sequence; the transimpedance amplifier is used to convert the photocurrent generated by the photodiode sensing light into a voltage, and perform a first-stage amplification on the converted voltage to obtain a first-stage voltage; the voltage amplifier includes an operational amplifier and a fused feedback resistor network circuit connected in parallel to the operational amplifier, the input end of the operational amplifier is connected to the output end of the transimpedance amplifier, and is used to perform a second-stage amplification on the first-stage voltage output by the transimpedance amplifier to obtain a second-stage voltage; the input end of the sensing measurement circuit is connected to the output end of the operational amplifier, and is used to obtain the second-stage voltage output by the operational amplifier, obtain a measured voltage value, and determine a voltage compensation value of the compensation operational amplifier based on the measured voltage value; the fused feedback resistor network circuit is connected to the output end of the sensing measurement circuit, and is used to determine a feedback resistor value corresponding to the voltage compensation value based on the voltage compensation value output by the sensing measurement circuit through a fused control method, and feed it back to the input end of the operational amplifier to adjust the amplification of the operational amplifier to a desired constant amplification, so that the operational amplifier is maintained at a constant amplification, thereby maintaining a constant amplification of the voltage amplifier. Thus, by adding a sensing measurement circuit to the optical sensor, the second-stage voltage output by the operational amplifier is measured according to the manufacturing process change, the measured voltage value is obtained, and the voltage compensation value of the compensation operational amplifier is determined based on the measured voltage value; the fused feedback resistor network circuit determines the feedback resistor value corresponding to the voltage compensation value through a fused control method based on the voltage compensation value output by the sensing measurement circuit, and feeds back to the input end of the operational amplifier, so as to realize the feedback of the voltage compensation value output by the sensing measurement circuit to the input end of the operational amplifier, adjust the amplification of the operational amplifier to the required constant amplification, maintain the operational amplifier at a constant amplification, and thus keep the voltage amplifier at a constant amplification. Thus, the changes in the amplification and sensitivity of the optical sensor caused by the inevitable deviation in the manufacturing process can be improved, the changes in the amplification and sensitivity caused by the manufacturing process change can be minimized, and the stability of the optical sensor in sensitive applications can be guaranteed. Thus, the problem that the changes in the amplification and sensitivity of the optical sensor caused by the inevitable deviation in the manufacturing process of the existing optical sensor can be solved, which brings potential fatal errors in sensitive applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] One or more embodiments are exemplarily described by pictures in the corresponding drawings, and these exemplified descriptions do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings represent similar elements, and unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0024] Figure 1 It is a schematic diagram of the structure of an optical sensor in the prior art;

[0025] Figure 2 It is a structural schematic diagram of an amplifier for a light sensor provided by the present invention;

[0026] Figure 3 It is a structural schematic diagram of a fused feedback resistor network circuit in an amplifier for a light sensor provided by the present invention;

[0027] Figure 4 It is a structural schematic diagram of a light sensor provided by the present invention;

[0028] Figure 5 It is a structural schematic diagram of an optical sensor device provided by the present invention. DETAILED DESCRIPTION

[0029] In order to facilitate the understanding of the present invention, the present invention is described in more detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that when an element is described as "fixed to" another element, it can be directly on another element or there can be one or more centered elements therebetween. When an element is described as "connected" to another element, it can be directly connected to another element or there can be one or more centered elements therebetween. The orientation or positional relationship indicated by the terms "upper", "lower", "inner", "outer", "bottom" etc. used in this specification is based on the orientation or positional relationship shown in the accompanying drawings, only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0030] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in this specification and in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used in this specification includes any and all combinations of one or more of the related listed items.

[0031] In addition, the technical features involved in different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0032] The amplifier's ability to amplify a signal is generally expressed in terms of amplification or amplification ratio. Amplification, also known as amplification ratio, refers to the ratio of the output signal amplitude to the input signal amplitude. Amplification (ratio) is an important parameter for measuring amplifier performance. It indicates the degree of amplification of the output signal relative to the input signal and reflects the amplifier's ability to amplify the signal. Amplification (ratio) is usually measured by gain (Gain), usually expressed in decibels (dB) or multiples. In decibel notation, gain (dB) = 20*log10(Vout / Vi n), where Vout is the voltage amplitude of the output signal and Vin is the voltage amplitude of the input signal. This representation method is often used in the field of electronic communications. In multiple notation, gain (multiple) = Vout / Vi n, which directly indicates how many times the output signal is the input signal. Amplification (ratio) can be divided into three types: voltage gain, current gain, and power gain: Voltage gain (Av): indicates the ratio of output voltage to input voltage. Current gain (Ai): indicates the ratio of output current to input current. Power gain (Ap): It refers to the ratio of output power to input power.

[0033] See also Figure 1 . Figure 1 The figure shows the structure of the existing optical sensor. Figure 1 In the figure, the light sensor includes a photodiode 5 and a signal amplifier 6. The photodiode 5 receives the light signal and converts it into a photocurrent. However, the converted photocurrent is a weak signal. At this time, the signal amplifier 6 is needed to convert the converted photocurrent into a voltage and amplify it. The signal amplifier 6 is generally composed of a transimpedance amplifier (TIA) 61 and at least one level of voltage amplifier (Voltage Amplifier) ​​62. In the first stage, the transimpedance amplifier 61 uses a transimpedance resistor (TransImpedance Resistor) to convert the photocurrent into a voltage; in the second stage, the voltage amplifier 62 uses an operational amplifier (OPAMP) 621 and a feedback resistor (Feedback Resisitor) 622 to adjust the voltage amplification to the required voltage value.

[0034] In the case of using the voltage amplifier 62 in the second stage, since the voltage amplifier 62 uses the amplification as the resistivity, even if the separation of the resistance value changes during the manufacturing process and is greater than or less than the original target value, the resistivity does not change, so the voltage amplifier can maintain a constant amplification. However, in the case of using the transimpedance amplifier 61 in the first stage, since the amplification of the transimpedance amplifier 61 directly appears in the resistance value itself, if the sheet resistance value of the resistor changes during the manufacturing process, the amplification will also change accordingly (for example, if the sheet resistance value of the resistor changes by + / -20% during the manufacturing process, the amplification of the transimpedance amplifier 61 will also cause a + / -20% deviation), which will cause the amplification of the light sensor and the sensitivity of the light sensor to change, which will bring potential fatal errors in sensitive applications.

[0035] To this end, the present invention provides an amplifier for a light sensor, which is applied to the light sensor and includes a transimpedance amplifier, a voltage amplifier and a sensing and measuring circuit connected in sequence. The transimpedance amplifier converts the photocurrent generated by the photodiode sensing light into a voltage, and performs a first-stage amplification on the converted voltage to obtain a first-stage voltage; the voltage amplifier includes an operational amplifier and a fused feedback resistor network circuit connected in parallel to the operational amplifier, the input end of the operational amplifier is connected to the output end of the transimpedance amplifier, and is used to perform a second-stage amplification on the first-stage voltage output by the transimpedance amplifier to obtain a second-stage voltage; the sensing and measuring circuit obtains the second-stage voltage output by the operational amplifier to obtain a measured voltage value, and determines a voltage compensation value of the compensation operational amplifier based on the measured voltage value; the fused feedback resistor network circuit determines a feedback resistance value corresponding to the voltage compensation value through a fused control method based on the voltage compensation value output by the sensing and measuring circuit, and feeds back the feedback resistance value to the input end of the operational amplifier, adjusts the amplification degree of the operational amplifier to a desired constant amplification degree, maintains the operational amplifier at a constant amplification degree, and thus maintains the voltage amplifier at a constant amplification degree. Thus, the changes in the amplification and sensitivity of the optical sensor caused by the inevitable deviation in the manufacturing process can be improved, the changes in the amplification and sensitivity caused by the manufacturing process changes can be minimized, and the stability of the optical sensor in sensitive applications can be guaranteed. Thus, the problem that the changes in the amplification and sensitivity of the optical sensor caused by the inevitable deviation in the manufacturing process of the existing optical sensor can be solved, which may cause potential fatal errors in sensitive applications.

[0036] In order to facilitate understanding of the above inventive concept of the present invention, the above inventive concept of the present invention is described in more detail below in conjunction with the accompanying drawings and specific embodiments.

[0037] In one embodiment, Figure 2As shown, the present invention provides an amplifier 20 for a light sensor, which is applied to a light sensor 100, and includes a transimpedance amplifier 21, a voltage amplifier 22 and a sensing measurement circuit 23 connected in sequence; wherein:

[0038] The transimpedance amplifier 21 is used to convert the photocurrent generated by the photodiode 10 sensing light into a voltage, and perform a first-stage amplification on the converted voltage to obtain a first-stage voltage;

[0039] The voltage amplifier 22 includes an operational amplifier 221 and a fused feedback resistor network circuit 222 connected in parallel to the operational amplifier 221. The input end of the operational amplifier 221 is connected to the output end of the transimpedance amplifier 21, and is used to perform a second-stage amplification on the first-stage voltage output by the transimpedance amplifier 21 to obtain a second-stage voltage.

[0040] The sensing measurement circuit 23 has an input end connected to the output end of the operational amplifier 221, and is used to obtain the second-stage voltage output by the operational amplifier 221, obtain a measured voltage value, and determine a voltage compensation value of the compensation operational amplifier 221 based on the measured voltage value;

[0041] The fused feedback resistor network circuit 222 is connected to the output end of the sensing and measuring circuit 23, and is used to determine the feedback resistor value corresponding to the voltage compensation value through a fused control method based on the voltage compensation value output by the sensing and measuring circuit 23, and feed it back to the input end of the operational amplifier 221 to adjust the amplification of the operational amplifier 221 to the required constant amplification, so that the operational amplifier 221 is maintained at a constant amplification, thereby maintaining the voltage amplifier 22 at a constant amplification.

[0042] In this embodiment, an amplifier for a light sensor is provided, comprising a transimpedance amplifier, a voltage amplifier and a sensing measurement circuit connected in sequence; the transimpedance amplifier is used to convert the photocurrent generated by the photodiode sensing light into a voltage, and perform a first-stage amplification on the converted voltage to obtain a first-stage voltage; the voltage amplifier comprises an operational amplifier and a fused feedback resistor network circuit connected in parallel to the operational amplifier, the input end of the operational amplifier is connected to the output end of the transimpedance amplifier, and is used to perform a second-stage amplification on the first-stage voltage output by the transimpedance amplifier to obtain a second-stage voltage; the input end of the sensing measurement circuit is connected to the output end of the operational amplifier, and is used to obtain the second-stage voltage output by the operational amplifier, obtain a measured voltage value, and determine a voltage compensation value of the compensation operational amplifier based on the measured voltage value; the fused feedback resistor network circuit is connected to the output end of the sensing measurement circuit, and is used to determine a feedback resistance value corresponding to the voltage compensation value based on the voltage compensation value output by the sensing measurement circuit through a fused control method, and feed it back to the input end of the operational amplifier, so as to adjust the amplification degree of the operational amplifier to the required constant amplification degree, so that the operational amplifier is maintained at a constant amplification degree, thereby maintaining a constant amplification degree of the voltage amplifier. Thus, by adding a sensing measurement circuit to the optical sensor, the second-stage voltage output by the operational amplifier is measured according to the manufacturing process change, the measured voltage value is obtained, and the voltage compensation value of the compensation operational amplifier is determined based on the measured voltage value; the fused feedback resistor network circuit determines the feedback resistor value corresponding to the voltage compensation value through a fused control method based on the voltage compensation value output by the sensing measurement circuit, and feeds back to the input end of the operational amplifier, so as to realize the feedback of the voltage compensation value output by the sensing measurement circuit to the input end of the operational amplifier, adjust the amplification of the operational amplifier to the required constant amplification, maintain the operational amplifier at a constant amplification, and thus keep the voltage amplifier at a constant amplification. Thus, the changes in the amplification and sensitivity of the optical sensor caused by the inevitable deviation in the manufacturing process can be improved, the changes in the amplification and sensitivity caused by the manufacturing process change can be minimized, and the stability of the optical sensor in sensitive applications can be guaranteed. Thus, the problem that the changes in the amplification and sensitivity of the optical sensor caused by the inevitable deviation in the manufacturing process of the existing optical sensor can be solved, which brings potential fatal errors in sensitive applications.

[0043] In one embodiment, the transimpedance amplifier 21 is used to convert the photocurrent generated by the photodiode 10 sensing light into a voltage, and perform a first-stage amplification on the converted voltage to obtain a first-stage voltage.

[0044] like Figure 2 As shown, the photodiode 10 receives the optical signal and converts it into a photocurrent, and the converted photocurrent is a weak signal. At this time, a transimpedance amplifier 21 connected to the photodiode 10 is required to convert the converted photocurrent into a voltage and amplify it.

[0045] The transimpedance amplifier 21, whose English name is Trans Impedance Amplifier (TIA), is a type of amplifier. The amplifier type is defined according to the type of its input and output signals. In the field of electricity, it is assumed that the amplifier gain A = Y / X, Y is the output, and X is the input. Since a signal is characterized by either voltage or current, four types of amplifiers can be combined. Among them, when the input X is a current signal and the output Y is a voltage signal, the amplifier gain A = Y (voltage) / X (current), which has the dimension of resistance. At this time, the amplifier is generally called a transimpedance amplifier. The transimpedance amplifier is a current-to-voltage converter that can convert the input current into an output voltage of the amplifier gain A.

[0046] Specifically, in this embodiment, the transimpedance amplifier 21 uses a transimpedance resistor (TransImpedance Resistor) in the first stage to convert the photocurrent into a voltage to obtain a first-stage voltage V1.

[0047] like Figure 2 As shown, the first input terminal IN1 of the transimpedance amplifier 21 is connected to the cathode of the photodiode 10, the second input terminal IN2 of the transimpedance amplifier 21 is connected to the anode of the photodiode 10, and the first input terminal IN1 of the transimpedance amplifier 21 and the second input terminal IN2 of the transimpedance amplifier 21 receive the photocurrent output by the sensing photodiode 10; the output terminal OUT of the transimpedance amplifier 21 is connected to the input terminal of the operational amplifier 221 of the voltage amplifier 22, and is used to convert the photocurrent generated by the sensing photodiode 10 sensing light into a voltage, and perform a first-stage amplification on the converted voltage to obtain a first-stage voltage V1, and output the first-stage voltage V1 to the input terminal of the operational amplifier 221.

[0048] For example, the first input terminal IN1 of the transimpedance amplifier 21 is a non-inverting input terminal, and the second input terminal IN2 of the transimpedance amplifier 21 is an inverting output terminal. The non-inverting input terminal of the transimpedance amplifier 21 is connected to the cathode of the photodiode 10, and the inverting input terminal of the transimpedance amplifier 21 is connected to the anode of the photodiode 10. The non-inverting input terminal of the transimpedance amplifier 21 and the inverting input terminal of the transimpedance amplifier 21 receive the photocurrent output by the sensing photodiode 10; the output terminal OUT of the transimpedance amplifier 21 is connected to the input terminal of the operational amplifier 221, and is used to convert the photocurrent generated by the sensing photodiode 10 sensing light into a voltage, and perform a first-stage amplification on the converted voltage to obtain a first-stage voltage V1, and output the first-stage voltage V1 to the input terminal of the operational amplifier 221.

[0049] In this embodiment, in the light sensor with a built-in photodiode, when the light sensor is irradiated with detection light, the photodiode senses the light and generates a photocurrent, and the photocurrent is converted into a voltage and amplified and output by a transimpedance amplifier, thereby enabling the transimpedance amplifier to realize the function of converting the photocurrent signal into a voltage signal and then amplifying the voltage signal.

[0050] In one embodiment, the voltage amplifier 22 is connected to the output end of the transimpedance amplifier 21, and is used to perform a second-stage amplification on the first-stage voltage V1 output by the transimpedance amplifier 21 to obtain a second-stage voltage V2, and adjust the amplification degree of the voltage amplifier 22 using a melting control method based on the second-stage voltage.

[0051] As mentioned above, in the case of using a voltage amplifier in the second stage, since the voltage amplifier uses the amplification as the resistivity, the resistivity does not change even if the separation of the resistance value changes during the manufacturing process and is greater than or less than the original target value, so the voltage amplifier can maintain a constant amplification. However, in the case of using a transimpedance amplifier in the first stage, since the amplification of the transimpedance amplifier directly appears in the resistance value itself, if the sheet resistance value of the resistor changes in the manufacturing process, the amplification will also change accordingly (for example, if the sheet resistance value of the resistor changes by + / -20% in the manufacturing process, the amplification of the transimpedance amplifier will also cause a + / -20% deviation), which will cause the amplification of the light sensor and the sensitivity of the light sensor to change, which will bring potential fatal errors in sensitive applications. Therefore, it is necessary to improve the changes in the amplification and sensitivity of the light sensor caused by the inevitable deviation of the manufacturing process in the first stage, minimize the changes in the amplification and sensitivity caused by the manufacturing process changes, and ensure the stability of the light sensor in sensitive applications.

[0052] Specifically, Figure 2 and Figure 3 As shown, the voltage amplifier 22 includes an operational amplifier 221 and a fused feedback resistor network circuit 222 connected in parallel to the operational amplifier 221 .

[0053] The input end of the operational amplifier 221 is connected to the output end of the transimpedance amplifier 21, and is used to perform a second-stage amplification on the first-stage voltage V1 output by the transimpedance amplifier 21 to obtain the second-stage voltage V2. The output end of the operational amplifier 221 is connected to the sensing measurement circuit 23, and is used to output the second-stage voltage V2 to the sensing measurement circuit 23.

[0054] The sensing measurement circuit 23 has its input end connected to the output end of the operational amplifier 221, and is used to obtain the second stage voltage output by the operational amplifier 221, obtain a measured voltage value, and determine a voltage compensation value of the compensation operational amplifier 221 based on the measured voltage value.

[0055] Specifically, the sensing measurement circuit 23, whose English name is Messure Ci rcu it. The specific measurement process of the sensing measurement circuit 23 is as follows:

[0056] The input end of the sensing and measuring circuit 23 is connected to the output end of the operational amplifier 221 of the voltage amplifier 22. The second stage voltage V2 output by the operational amplifier 221 is measured based on the manufacturing process change to obtain a measured voltage value, and the measured voltage value is compared with the standard output voltage value of the voltage amplifier. The difference between the measured voltage value and the standard output voltage value is the voltage compensation value, so that the sensing and measuring circuit 23 can more accurately measure the sensitivity change or deviation. The sensing and measuring circuit 23 feeds back the voltage compensation value to the fused feedback resistor network circuit 222, so that the fused feedback resistor network circuit 222 compensates the amplification of the operational amplifier according to the voltage compensation value, and reflects the voltage compensation value output by the sensing and measuring circuit 23 on the amplification of the operational amplifier 221, so as to adjust the amplification of the operational amplifier 221 based on the need of manufacturing process changes, so as to achieve the purpose of adjusting the amplification of the voltage amplifier 22, minimize the amplification and sensitivity changes caused by process changes, and ensure the stability of the light sensor in sensitive applications.

[0057] like Figure 2 and Figure 3 As shown, the voltage amplifier 22 includes a fused feedback resistor network circuit 222 , and the fused feedback resistor network circuit 222 is connected in parallel to the operational amplifier 221 .

[0058] The fused feedback resistor network circuit 222 is connected to the output end of the sensing and measuring circuit 23, and is used to determine the feedback resistor value corresponding to the voltage compensation value based on the voltage compensation value output by the sensing and measuring circuit 23 through a fused control method, and feed it back to the input end of the operational amplifier 221 to adjust the amplification of the operational amplifier 221 to the required constant amplification, so that the operational amplifier 221 is maintained at a constant amplification, thereby maintaining the voltage amplifier 22 at a constant amplification.

[0059] Specifically, Figure 3As shown, the fused feedback resistor network circuit 222 includes a plurality of fused switches 2221 and a plurality of feedback resistors 2222 connected in sequence, each fused switch 2221 is isolated from each other and not connected, one fused switch 2221 is connected in parallel with one feedback resistor 2222, and the fused switch 2221 determines whether the feedback resistor 2222 connected in parallel with it is connected to the fused feedback resistor network circuit 222. When the fused switch 2221 is closed, the feedback resistor 2222 connected in parallel with it is short-circuited and not connected to the fused feedback resistor network circuit 222; when the fused switch 2221 is opened, the feedback resistor 2222 connected in parallel with it is connected to the fused feedback resistor network circuit 222; when the feedback resistor 2222 connected to the fused feedback resistor network circuit 222 is determined, the sum of the resistance values ​​of all the feedback resistors 2222 connected to the fused feedback resistor network circuit 222 is the feedback resistance value of the fused feedback resistor network circuit 222.

[0060] The fused feedback resistor network circuit 222 determines the feedback resistor value corresponding to the voltage compensation value through a fused control method based on the voltage compensation value output by the sensing measurement circuit 23, and feeds back to the input end of the operational amplifier 221, including:

[0061] Determine the degree of change of the amplification of the transimpedance amplifier within the resistance value variation range (for example, the resistance value variation range is + / -20%) according to the amplification of the transimpedance amplifier of the light sensor and the voltage compensation value output by the sensing measurement circuit 23;

[0062] Based on the degree of change of the amplification of the transimpedance amplifier within the resistance value change range, determining the resistance value of the amplification compensation range of the voltage amplifier in the voltage amplifier;

[0063] According to the resistance value of the amplification compensation range, at least one feedback resistor 2222 having a resistance value equivalent to the amplification compensation range is selected from a plurality of feedback resistors 2222 connected in sequence, the selected feedback resistor 2222 is disconnected via a melting switch 2221 connected in parallel with the feedback resistor, and the feedback resistor is connected to the melting type feedback resistor network circuit 222. The sum of the resistance values ​​of all the feedback resistors 2222 connected to the melting type feedback resistor network circuit 222 is the feedback resistance value of the melting type feedback resistor network circuit 222.

[0064] In this embodiment, the voltage amplifier includes a fused feedback resistor network circuit, the fused feedback resistor network circuit is connected in parallel to the operational amplifier, the fused feedback resistor network circuit includes a plurality of fused switches and a plurality of fused switches connected in sequence, one fused switch is connected in parallel with one feedback resistor, the fused switch determines whether the feedback resistor connected in parallel with it is connected to the fused feedback resistor network circuit, and when the fused switch is disconnected, the feedback resistor connected in parallel with it is connected to the fused feedback resistor network circuit. According to the amplification of the transimpedance amplifier of the optical sensor and the voltage compensation value output by the sensing measurement circuit, the degree of change of the amplification of the transimpedance amplifier within the resistance value change range is determined, and the resistance value of the amplification compensation range of the voltage amplifier is determined in the voltage amplifier; according to the resistance value of the amplification compensation range, a feedback resistor equivalent to the resistance value of the amplification compensation range is selected from a number of feedback resistors connected in sequence, and the selected feedback resistor is disconnected through a fused switch connected in parallel with it, and connected to a fused feedback resistor network circuit. The sum of the resistance values ​​of all feedback resistors connected to the fused feedback resistor network circuit is the feedback resistance value of the fused feedback resistor network circuit, which is fed back to the input end of the operational amplifier to adjust the amplification of the operational amplifier to the required constant amplification, so that the operational amplifier is maintained at a constant amplification, thereby maintaining the voltage amplifier at a constant amplification.

[0065] Based on the same concept, in one embodiment, Figure 4 As shown, the present invention provides a light sensor 100, which has a built-in photodiode 10, and the light sensor 100 also includes an amplifier 20 for the light sensor, wherein:

[0066] A photodiode 10 is used to sense light and generate a photocurrent output;

[0067] The photosensor amplifier 20 is connected to the photodiode 10 , and is used to convert the photocurrent output by the photodiode 10 into a voltage and amplify the voltage, and to adjust the amplification degree of the photosensor amplifier 20 using a melting control method based on the amplified voltage.

[0068] The optical sensor amplifier 20 includes a transimpedance amplifier 21, a voltage amplifier 22 and a sensing measurement circuit 23 connected in sequence; wherein:

[0069] The transimpedance amplifier 21 is used to convert the photocurrent generated by the photodiode 10 sensing light into a voltage, and perform a first-stage amplification on the converted voltage to obtain a first-stage voltage.

[0070] Specifically, Figure 2As shown, the photodiode 10 receives the light signal and converts it into a photocurrent, and the converted photocurrent is a weak signal. At this time, a transimpedance amplifier 21 connected to the photodiode 10 is required to convert the converted photocurrent into a voltage and amplify it. Specifically, the transimpedance amplifier 21 uses a transimpedance resistor (TransImpedance Resistor) in the first stage to convert the photocurrent into a voltage to obtain a first stage voltage V1.

[0071] like Figure 2 As shown, the first input terminal IN1 of the transimpedance amplifier 21 is connected to the cathode of the photodiode 10, the second input terminal IN2 of the transimpedance amplifier 21 is connected to the anode of the photodiode 10, and the first input terminal IN1 of the transimpedance amplifier 21 and the second input terminal IN2 of the transimpedance amplifier 21 receive the photocurrent output by the sensing photodiode 10; the output terminal OUT of the transimpedance amplifier 21 is connected to the input terminal of the operational amplifier 221 of the voltage amplifier 22, and is used to convert the photocurrent generated by the sensing photodiode 10 sensing light into a voltage, and perform a first-stage amplification on the converted voltage to obtain a first-stage voltage V1, and output the first-stage voltage V1 to the input terminal of the operational amplifier 221. Thus, in the light sensor with a built-in photodiode, when the light sensor is irradiated by the detection light, the photodiode senses the light and generates a photocurrent, which is converted into a voltage and amplified and output by the transimpedance amplifier, so that the transimpedance amplifier realizes the function of converting the photocurrent signal into a voltage signal and then amplifying the voltage signal.

[0072] The voltage amplifier 22 includes an operational amplifier 221 and a fused feedback resistor network circuit 222 connected in parallel to the operational amplifier 221. The input end of the operational amplifier 221 is connected to the output end of the transimpedance amplifier 21 for performing a second-stage amplification on the first-stage voltage output by the transimpedance amplifier 21 to obtain a second-stage voltage.

[0073] Specifically, Figure 2 and Figure 3 As shown, the input end of the operational amplifier 221 is connected to the output end of the transimpedance amplifier 21, and is used to perform a second-stage amplification on the first-stage voltage V1 output by the transimpedance amplifier 21 to obtain the second-stage voltage V2. The output end of the operational amplifier 221 is connected to the sensing measurement circuit 23, and is used to output the second-stage voltage V2 to the sensing measurement circuit 23.

[0074] The sensing measurement circuit 23 has its input end connected to the output end of the operational amplifier 221, and is used to obtain the second stage voltage output by the operational amplifier 221, obtain a measured voltage value, and determine a voltage compensation value of the compensation operational amplifier 221 based on the measured voltage value.

[0075] Specifically, the specific measurement process of the perception measurement circuit 23 is as follows:

[0076] The input end of the sensing and measuring circuit 23 is connected to the output end of the operational amplifier 221 of the voltage amplifier 22. The second stage voltage V2 output by the operational amplifier 221 is measured based on the manufacturing process change to obtain a measured voltage value, and the measured voltage value is compared with the standard output voltage value of the voltage amplifier. The difference between the measured voltage value and the standard output voltage value is the voltage compensation value, so that the sensing and measuring circuit 23 can more accurately measure the sensitivity change or deviation. The sensing and measuring circuit 23 feeds back the voltage compensation value to the fused feedback resistor network circuit 222, so that the fused feedback resistor network circuit 222 compensates the amplification of the operational amplifier according to the voltage compensation value, and reflects the voltage compensation value output by the sensing and measuring circuit 23 on the amplification of the operational amplifier 221, so as to adjust the amplification of the operational amplifier 221 based on the need of manufacturing process changes, so as to achieve the purpose of adjusting the amplification of the voltage amplifier 22, minimize the amplification and sensitivity changes caused by process changes, and ensure the stability of the light sensor in sensitive applications.

[0077] The fused feedback resistor network circuit 222 is connected to the output end of the sensing and measuring circuit 23, and is used to determine the feedback resistor value corresponding to the voltage compensation value through a fused control method based on the voltage compensation value output by the sensing and measuring circuit 23, and feed it back to the input end of the operational amplifier 221 to adjust the amplification of the operational amplifier 221 to the required constant amplification, so that the operational amplifier 221 is maintained at a constant amplification, thereby maintaining the voltage amplifier 22 at a constant amplification.

[0078] Specifically, Figure 3 As shown, the fused feedback resistor network circuit 222 includes a plurality of fused switches 2221 and a plurality of feedback resistors 2222 connected in sequence, each fused switch 2221 is isolated from each other and not connected, one fused switch 2221 is connected in parallel with one feedback resistor 2222, and the fused switch 2221 determines whether the feedback resistor 2222 connected in parallel with it is connected to the fused feedback resistor network circuit 222. When the fused switch 2221 is closed, the feedback resistor 2222 connected in parallel with it is short-circuited and not connected to the fused feedback resistor network circuit 222; when the fused switch 2221 is opened, the feedback resistor 2222 connected in parallel with it is connected to the fused feedback resistor network circuit 222; when the feedback resistor 2222 connected to the fused feedback resistor network circuit 222 is determined, the sum of the resistance values ​​of all the feedback resistors 2222 connected to the fused feedback resistor network circuit 222 is the feedback resistance value of the fused feedback resistor network circuit 222.

[0079] The fused feedback resistor network circuit 222 determines the feedback resistor value corresponding to the voltage compensation value through a fused control method based on the voltage compensation value output by the sensing measurement circuit 23, and feeds back to the input end of the operational amplifier 221, including:

[0080] Determine the degree of change of the amplification of the transimpedance amplifier within the resistance value variation range (for example, the resistance value variation range is + / -20%) according to the amplification of the transimpedance amplifier of the light sensor and the voltage compensation value output by the sensing measurement circuit 23;

[0081] Based on the degree of change of the amplification of the transimpedance amplifier within the resistance value change range, determining the resistance value of the amplification compensation range of the voltage amplifier in the voltage amplifier;

[0082] According to the resistance value of the amplification compensation range, at least one feedback resistor 2222 having a resistance value equivalent to the amplification compensation range is selected from a plurality of feedback resistors 2222 connected in sequence, the selected feedback resistor 2222 is disconnected via a melting switch 2221 connected in parallel with the feedback resistor, and the feedback resistor is connected to the melting type feedback resistor network circuit 222. The sum of the resistance values ​​of all the feedback resistors 2222 connected to the melting type feedback resistor network circuit 222 is the feedback resistance value of the melting type feedback resistor network circuit 222.

[0083] In this embodiment, a light sensor is provided, which has a built-in photodiode and a light sensor amplifier. The photodiode is used to sense light and generate a photocurrent output. The light sensor amplifier is connected to the photodiode and is used to convert the photocurrent output by the photodiode into a voltage and amplify the voltage. The amplification degree of the electro-optical sensor amplifier is adjusted based on the amplified voltage using a melting control method. The amplifier for the light sensor includes a transimpedance amplifier, a voltage amplifier and a sensing measurement circuit connected in sequence; the transimpedance amplifier converts the photocurrent generated by the photodiode sensing light into a voltage, and performs a first-stage amplification on the converted voltage to obtain a first-stage voltage; the voltage amplifier includes an operational amplifier and a fused feedback resistor network circuit connected in parallel to the operational amplifier, the input end of the operational amplifier is connected to the output end of the transimpedance amplifier, and is used to perform a second-stage amplification on the first-stage voltage output by the transimpedance amplifier to obtain a second-stage voltage; the input end of the sensing measurement circuit is connected to the output end of the operational amplifier, and is used to obtain the second-stage voltage output by the operational amplifier, obtain a measured voltage value, and determine a voltage compensation value of the compensation operational amplifier based on the measured voltage value; the fused feedback resistor network circuit is connected to the output end of the sensing measurement circuit, and is used to determine a feedback resistor value corresponding to the voltage compensation value based on the voltage compensation value output by the sensing measurement circuit through a fused control method, and feed it back to the input end of the operational amplifier to adjust the amplification of the operational amplifier to the required constant amplification, so that the operational amplifier is maintained at a constant amplification, thereby maintaining a constant amplification of the voltage amplifier. Thus, the optical sensor itself can provide the function of adjusting the amplification through the optical sensor amplifier, so that the optical sensor amplifier maintains a constant amplification. By adding a sensing measurement circuit to the optical sensor, the second-stage voltage output by the operational amplifier is measured according to the manufacturing process change, the measured voltage value is obtained, and the voltage compensation value of the compensation operational amplifier is determined based on the measured voltage value; the fused feedback resistor network circuit determines the feedback resistor value corresponding to the voltage compensation value through the fused control method based on the voltage compensation value output by the sensing measurement circuit, and feeds back to the input end of the operational amplifier, so as to realize the feedback of the voltage compensation value output by the sensing measurement circuit to the input end of the operational amplifier, adjust the amplification of the operational amplifier to the required constant amplification, and maintain the operational amplifier at a constant amplification, so as to keep the voltage amplifier at a constant amplification. Thus, the changes in the amplification and sensitivity of the optical sensor caused by the inevitable deviation in the manufacturing process can be improved, the changes in the amplification and sensitivity caused by the manufacturing process change can be minimized, and the stability of the optical sensor in sensitive applications can be guaranteed. Thus, the problem that the changes in the amplification and sensitivity of the optical sensor caused by the inevitable deviation in the manufacturing process of the existing optical sensor can be solved, which brings potential fatal errors in sensitive applications.

[0084] It should be noted that the above-mentioned optical sensor embodiment and the above-mentioned optical sensor amplifier embodiment belong to the same concept, and the specific implementation process is detailed in the optical sensor amplifier embodiment, and the technical features in the optical sensor amplifier embodiment are correspondingly applicable in the above-mentioned optical sensor embodiment, which will not be repeated here.

[0085] Based on the same concept, in one embodiment, Figure 5 As shown, the present invention provides a light sensor device 500, including the light sensor 100 described in any one of the above embodiments.

[0086] In this embodiment, the optical sensor 100 is consistent with the optical sensor 100 described in any of the above embodiments. The specific structure and function can refer to the optical sensor 100 described in any of the above embodiments, and will not be repeated here.

[0087] For example, the optical sensor 100 of the optical sensor device 500 has a built-in photodiode 10 and an optical sensor amplifier 20 , and the optical sensor device 500 may be a light-to-voltage converter (LTV) and a light-to-frequency converter (LTF).

[0088] In this embodiment, a light sensor device is provided, including a light sensor, the light sensor including a built-in photodiode and a light sensor amplifier, the photodiode is used to sense light and generate a photocurrent output; the light sensor amplifier is connected to the photodiode, and is used to convert the photocurrent output by the photodiode into a voltage and amplify the voltage, and the amplification of the electro-optical sensor amplifier is adjusted based on the amplified voltage using a melting control method. The amplifier for the light sensor includes a transimpedance amplifier, a voltage amplifier and a sensing measurement circuit connected in sequence; the transimpedance amplifier converts the photocurrent generated by the photodiode sensing light into a voltage, and performs a first-stage amplification on the converted voltage to obtain a first-stage voltage; the voltage amplifier includes an operational amplifier and a fused feedback resistor network circuit connected in parallel to the operational amplifier, the input end of the operational amplifier is connected to the output end of the transimpedance amplifier, and is used to perform a second-stage amplification on the first-stage voltage output by the transimpedance amplifier to obtain a second-stage voltage; the input end of the sensing measurement circuit is connected to the output end of the operational amplifier, and is used to obtain the second-stage voltage output by the operational amplifier, obtain a measured voltage value, and determine a voltage compensation value of the compensation operational amplifier based on the measured voltage value; the fused feedback resistor network circuit is connected to the output end of the sensing measurement circuit, and is used to determine a feedback resistor value corresponding to the voltage compensation value based on the voltage compensation value output by the sensing measurement circuit through a fused control method, and feed it back to the input end of the operational amplifier to adjust the amplification of the operational amplifier to the required constant amplification, so that the operational amplifier is maintained at a constant amplification, thereby maintaining a constant amplification of the voltage amplifier. Thus, the optical sensor in the optical sensor device can provide the function of adjusting the amplification through the optical sensor amplifier, so that the optical sensor amplifier maintains a constant amplification. By adding a sensing measurement circuit to the optical sensor, the second-stage voltage output by the operational amplifier is measured according to the manufacturing process change, the measured voltage value is obtained, and the voltage compensation value of the compensation operational amplifier is determined based on the measured voltage value; the fused feedback resistor network circuit determines the feedback resistor value corresponding to the voltage compensation value through the fused control method based on the voltage compensation value output by the sensing measurement circuit, and feeds back to the input end of the operational amplifier, so as to realize the feedback of the voltage compensation value output by the sensing measurement circuit to the input end of the operational amplifier, adjust the amplification of the operational amplifier to the required constant amplification, and maintain the operational amplifier at a constant amplification, so as to keep the voltage amplifier at a constant amplification. Thus, the changes in the amplification and sensitivity of the optical sensor caused by the inevitable deviation in the manufacturing process can be improved, the changes in the amplification and sensitivity caused by the manufacturing process change can be minimized, and the stability of the optical sensor in sensitive applications can be guaranteed. Thus, the problem that the changes in the amplification and sensitivity of the optical sensor caused by the inevitable deviation in the manufacturing process of the existing optical sensor can be solved, which brings potential fatal errors in sensitive applications.

[0089] It should be noted that the above-mentioned optical sensor device embodiment and the above-mentioned optical sensor amplifier and / or optical sensor embodiment belong to the same concept, and the specific implementation process is detailed in the optical sensor amplifier and / or optical sensor embodiment, and the technical features in the optical sensor amplifier and / or optical sensor embodiment are correspondingly applicable in the above-mentioned optical sensor device embodiment, which will not be repeated here.

[0090] It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device including the element.

[0091] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them. Under the concept of the present invention, the technical features in the above embodiments or different embodiments may also be combined, the steps may be implemented in any order, and there are many other changes in different aspects of the present invention as described above, which are not provided in detail for the sake of simplicity. Although the present invention has been described in detail with reference to the above embodiments, a person of ordinary skill in the art should understand that the technical solutions described in the above embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An amplifier for a light sensor, characterized in that: It includes a transimpedance amplifier, a voltage amplifier and a sensing measurement circuit connected in sequence; wherein: The transimpedance amplifier is used to convert the photocurrent generated by the photodiode sensing light into a voltage, and perform a first-stage amplification on the converted voltage to obtain a first-stage voltage; The voltage amplifier includes an operational amplifier and a fused feedback resistor network circuit connected in parallel to the operational amplifier, wherein the input end of the operational amplifier is connected to the output end of the transimpedance amplifier, and is used to perform a second-stage amplification on the first-stage voltage to obtain a second-stage voltage; The input end of the sensing measurement circuit is connected to the output end of the operational amplifier, and is used to obtain the second stage voltage, obtain a measured voltage value, and determine a voltage compensation value for compensating the operational amplifier based on the measured voltage value; The fused feedback resistor network circuit is connected to the output end of the sensing measurement circuit, and is used to determine the feedback resistance value corresponding to the voltage compensation value through a fused control method based on the voltage compensation value, and feed it back to the input end of the operational amplifier to adjust the amplification of the operational amplifier.

2. The optical sensor amplifier according to claim 1, wherein: The first input terminal of the transimpedance amplifier is connected to the cathode of the photodiode, the second input terminal of the transimpedance amplifier is connected to the anode of the photodiode, and the output terminal of the transimpedance amplifier is connected to the input terminal of the operational amplifier.

3. The optical sensor amplifier according to claim 1, wherein: The sensing measurement circuit is used to obtain the second stage voltage, obtain a measured voltage value, and determine a voltage compensation value for compensating the operational amplifier based on the measured voltage value, including: The input end of the sensing measurement circuit is connected to the output end of the operational amplifier, the second stage voltage output by the operational amplifier is obtained, a measured voltage value is obtained, and the measured voltage value is compared with the standard output voltage value of the voltage amplifier. The difference between the measured voltage value and the standard output voltage value is the voltage compensation value.

4. The optical sensor amplifier according to claim 3, wherein: The fused feedback resistor network circuit includes a plurality of fused switches and a plurality of feedback resistors connected in sequence. One fused switch is connected in parallel with one feedback resistor. The fused switch determines whether the feedback resistor connected in parallel with the fused switch is connected to the fused feedback resistor network circuit.

5. The optical sensor amplifier according to claim 4, wherein: The fusion switch determines whether the feedback resistor connected in parallel with the fusion switch is connected to the fusion type feedback resistor network circuit, including: When the fusion switch is closed, the feedback resistor connected in parallel with it is short-circuited, and the fusion-type feedback resistor network circuit is not connected; When the fusion switch is disconnected, the feedback resistor connected in parallel with it is connected to the fusion type feedback resistor network circuit; when the feedback resistor connected to the fusion type feedback resistor network circuit is determined, the sum of the resistance values ​​of all the feedback resistors connected to the fusion type feedback resistor network circuit is the feedback resistance value of the fusion type feedback resistor network circuit.

6. The optical sensor amplifier according to claim 5, wherein: The fused feedback resistor network circuit is connected to the output end of the sensing measurement circuit, and is used to determine the feedback resistor value corresponding to the voltage compensation value through a fused control method based on the voltage compensation value, including: Determining the degree of change of the amplification of the transimpedance amplifier within the resistance value change range according to the amplification of the transimpedance amplifier of the optical sensor and the voltage compensation value; Based on the degree of change of the amplification of the transimpedance amplifier within the resistance value change range, determining the resistance value of the amplification compensation range of the voltage amplifier in the brown voltage amplifier; According to the resistance value of the amplification compensation range, at least one feedback resistor with a resistance value equivalent to the amplification compensation range is selected from a plurality of feedback resistors connected in sequence, the selected feedback resistor is disconnected through the fusion switch connected in parallel with the feedback resistor, and the selected feedback resistor is connected to the fusion type feedback resistor network circuit, and the sum of the resistance values ​​of all the feedback resistors connected to the fusion type feedback resistor network circuit is the feedback resistance value of the fusion type feedback resistor network circuit.

7. A light sensor having a built-in diode, wherein the diode is used to sense light and generate a photocurrent output; characterized in that: The optical sensor also includes an optical sensor amplifier as described in any one of claims 1 to 6, wherein the optical sensor amplifier is connected to the photodiode and is used to convert the photocurrent output by the photodiode into a voltage and amplify it, and adjust the amplification of the optical sensor amplifier using a melting control method based on the amplified voltage.

8. A light sensor device, characterized in that: Comprising the light sensor as claimed in claim 7.

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