CN107122703B - Biological information sensing device, electronic apparatus, and common mode interference detection method - Google Patents
Biological information sensing device, electronic apparatus, and common mode interference detection method Download PDFInfo
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- CN107122703B CN107122703B CN201710153273.3A CN201710153273A CN107122703B CN 107122703 B CN107122703 B CN 107122703B CN 201710153273 A CN201710153273 A CN 201710153273A CN 107122703 B CN107122703 B CN 107122703B
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
- G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
- G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
- G06V40/12—Fingerprints or palmprints
- G06V40/13—Sensors therefor
- G06V40/1306—Sensors therefor non-optical, e.g. ultrasonic or capacitive sensing
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Abstract
The invention discloses a biological information sensing device, electronic equipment and a common-mode interference detection method. The biological information sensing device comprises a sensor array, a driving circuit, an analog front-end circuit, a sampling circuit, a resetting circuit, a control circuit and a processing circuit. When the biological information sensing device carries out common mode interference detection, the control circuit controls the drive circuit not to output the excitation signal to the sensor array, and controls the reset circuit to reset the sensor array and the analog front-end circuit, and after the sensor array and the analog front-end circuit are reset, the sampling circuit is further controlled to carry out interval sampling on the signal output by the analog front-end circuit, and the processing circuit confirms whether common mode interference exists in the biological information sensing device according to the signal sampled by the sampling circuit.
Description
Technical Field
the present invention relates to the field of biometric information detection, and in particular, to a biometric information sensing device, an electronic apparatus, and a method for detecting common mode interference of a biometric information sensing device.
Background
Referring to fig. 1 and fig. 2 together, fig. 1 is a schematic diagram illustrating a mobile terminal charging by using a charger. Fig. 2 is an equivalent circuit diagram illustrating the existence of common mode interference during charging of the mobile terminal of fig. 1. As the biometric information sensing device 50 (e.g., fingerprint sensing device) is popularized in the smart mobile terminal 500, the demand for the biometric information sensing device 50 is increasing. However, the biological information sensing device 50 may be mounted on the smart mobile terminal 500 to cause a common mode interference problem. For example, in the process of using the charger 60 by the smart mobile terminal 500, since the charger 60 is designed based on the switching power supply, interference may occur to the power supply and the ground of the mobile terminal 500, and the frequency of the interference signal is approximately between 200KHZ and 400 KHZ. One end of the charger 60 is generally connected to the commercial power system, so that the interference is equivalent to a capacitance Ccom existing between the sensing electrode 51 of the biological information sensing device 50 and the interference source.
Taking the biological information sensing device 50 as a fingerprint sensing device as an example, a detection capacitance Cf is formed between the finger F and the sensing electrode 51, and the finger F is connected to the ground through the human body Zbody. A parasitic capacitance Cp exists between the sensing electrode 51 and system ground. Due to the capacitance Ccom, the fingerprint sensing device 50 may detect signals without touching the fingerprint sensing device 50 with a finger, which may cause false detection of the fingerprint sensing device 50, and more seriously, when the fingerprint sensing device 50 detects a fingerprint, interference signals may be superimposed on the fingerprint detection signals, which seriously affects the signal-to-noise ratio of the fingerprint detection signals of the fingerprint sensing device 50.
Disclosure of Invention
The embodiment of the invention aims to solve at least one technical problem in the prior art. For this reason, embodiments of the present invention need to provide a biological information sensing device, an electronic apparatus, and a method of detecting common mode interference of a biological information sensing device.
the present invention provides a biological information sensing device, including:
an array of sensors;
A drive circuit for providing an excitation signal to the sensor array to perform biological information sensing;
an analog front end circuit for receiving a sensing signal from the sensor array output;
The sampling circuit is used for sampling a signal output by the analog front-end circuit;
the reset circuit is used for outputting a reset signal to reset the sensor array and the analog front-end circuit;
The control circuit is respectively connected with the driving circuit, the sampling circuit and the reset circuit; and
The processing circuit is connected with the sampling circuit;
When the biological information sensing device carries out common mode interference detection, the control circuit controls the drive circuit not to output the excitation signal to the sensor array, and controls the reset circuit to reset the sensor array and the analog front-end circuit, and after the sensor array and the analog front-end circuit are reset, the sampling circuit is further controlled to carry out interval sampling on the signal output by the analog front-end circuit, and the processing circuit confirms that the biological information sensing device has the common mode interference according to the signal sampled by the sampling circuit.
optionally, when the processing circuit confirms that the biological information sensing device has common-mode interference, the signal frequency of the common-mode interference is further analyzed.
Optionally, when it is determined that the common-mode interference exists in the biological information sensing apparatus, the common-mode interference detection method further includes: the signal amplitude of the common mode interference is analyzed.
Optionally, when it is determined that the common-mode interference exists in the biological information sensing apparatus, the common-mode interference detection method further includes: the signal phase of the common-mode interference is analyzed.
Optionally, the control circuit controls whether the biological information sensing device is switched from performing common mode interference detection to performing biological information sensing according to the confirmation result of the processing circuit.
optionally, when the processing circuit confirms that the biological information sensing device does not have common-mode interference, the control circuit drives the sensor array to perform biological information sensing by controlling the reset circuit to reset the sensor array and the analog front-end circuit and further controlling the driving circuit to provide an excitation signal to the sensor array after the sensor array and the analog front-end circuit are reset.
optionally, when the processing circuit confirms that the biological information sensing device has common-mode interference, the control circuit controls the biological information sensing device to continue to perform common-mode interference detection, or the control circuit controls the reset circuit to reset the sensor array and the analog front-end circuit, and controls the driving circuit to adjust the frequency of the excitation signal, and after the sensor array and the analog front-end circuit are reset, controls the driving circuit to output the excitation signal with the adjusted frequency to the sensor array, so as to drive the sensor array to perform biological information sensing.
optionally, the frequency of the adjusted excitation signal is different from the frequency of the common mode interference signal.
optionally, the frequency of the adjusted excitation signal is more than 1.5 times the frequency of the common-mode interference signal, or the signal frequency of the common-mode interference is more than 1.5 times the frequency of the adjusted excitation signal.
alternatively, when the driving circuit provides the excitation signal to the sensor array to perform the biological information sensing, the analog front-end circuit receives the sensing signal from the sensor array output and outputs a corresponding signal to the processing circuit, and the processing circuit obtains the biological information according to the signal from the analog front-end circuit output.
Optionally, the control circuit controls the biological information sensing device to perform a plurality of common mode interference detections before performing the biological information sensing.
Optionally, when the biological information sensing apparatus performs common-mode interference detection, the sampling circuit performs correlated double sampling on the sensing signal output by the analog front-end circuit.
The invention also provides electronic equipment comprising the biological information sensing device.
The present invention also provides a common mode interference detection method for a biological information sensing device, wherein the biological information sensing device includes:
An array of sensors;
A drive circuit for providing an excitation signal to the sensor array to perform biological information sensing;
An analog front end circuit for receiving a sensing signal from the sensor array output; and
the reset circuit is used for outputting a reset signal to reset the sensor array and the analog front-end circuit;
The common-mode interference detection method comprises the following steps:
Controlling the drive circuit not to output the excitation signal to the sensor array;
Controlling the reset circuit to reset the sensor array and the analog front end circuit;
after the sensor array and the analog front-end circuit are reset, carrying out interval sampling on signals output by the analog front-end circuit; and
And judging whether the biological information sensing device has common-mode interference or not according to the sampled signal.
optionally, when it is determined that the common-mode interference exists in the biological information sensing apparatus, the common-mode interference detection method further includes: the signal frequency of the common mode interference is analyzed.
Optionally, when it is determined that the common-mode interference exists in the biological information sensing apparatus, the common-mode interference detection method further includes: the signal amplitude of the common mode interference is analyzed.
Optionally, when it is determined that the common-mode interference exists in the biological information sensing apparatus, the common-mode interference detection method further includes: the signal phase of the common-mode interference is analyzed.
Under control of the control circuit: the drive circuit does not send excitation signals to the drive circuit, the reset circuit resets the sensor array and the analog front end circuit, the sampling circuit samples signals output by the analog front end at intervals, and the processing circuit confirms the condition that the biological information sensing device has common-mode interference according to sampling results, so that the influence of the common-mode interference signals on subsequent biological information detection of the biological information sensing device can be avoided, and the signal-to-noise ratio of biological information detection signals of the biological information sensing device is improved. Accordingly, the electronic equipment with the biological information sensing device has high sensing precision, so that the use experience of a user is improved.
similarly, the common-mode interference detection method of the biological information sensing device of the present application can correspondingly improve the sensing accuracy of the biological information sensing device.
Additional aspects and advantages of embodiments of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of embodiments of the invention.
Drawings
the above and/or additional aspects and advantages of embodiments of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
Fig. 1 is a schematic diagram of a mobile terminal charged using a charger.
Fig. 2 is an equivalent circuit diagram of the mobile terminal of fig. 1 with common-mode interference during charging.
Fig. 3 is a block diagram schematically illustrating an embodiment of the biological information sensing apparatus according to the present invention.
Fig. 4 is a timing chart of an embodiment of the biological information sensing apparatus shown in fig. 3.
fig. 5 is a schematic plan view of an embodiment of the electronic device of the present invention.
Detailed Description
reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
In the description of the present invention, it is to be understood that the terms "first", "second", "third" and "fourth" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, features defined as "first", "second", "third", "fourth" may explicitly or implicitly include one or more of the described features. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
in the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
the following disclosure provides many different embodiments or examples for implementing different features of the invention. To simplify the disclosure of the present invention, the components and settings of a specific example are described below. Of course, they are merely examples and are not intended to limit the present invention. Furthermore, the present invention may repeat reference numerals and/or reference letters in the various examples, which have been repeated for purposes of simplicity and clarity and do not in themselves dictate a relationship between the various embodiments and/or configurations discussed. In addition, the present invention provides examples of various specific processes and materials, but one of ordinary skill in the art may recognize applications of other processes and/or uses of other materials.
further, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to provide a thorough understanding of embodiments of the invention. One skilled in the relevant art will recognize, however, that the invention can be practiced without one or more of the specific details, or with other structures, components, and so forth. In other instances, well-known structures or operations are not shown or described in detail to avoid obscuring the invention.
referring to fig. 3 and 4, fig. 3 is a block diagram of a biological information sensing device 100 according to an embodiment of the invention, and fig. 4 is a timing diagram of the biological information sensing device 100 shown in fig. 3 according to an embodiment of the invention. The biological information sensing apparatus 100 includes a sensor array 101, a driving circuit 102, an analog front end circuit 103, a sampling circuit 104, a reset circuit 105, a control circuit 106, and a processing circuit 107. The sensor array 101 is connected to the driving circuit 102, the analog front end circuit 103 and the reset circuit 105, respectively. The control circuit 106 is respectively connected to the driving circuit 102, the sampling circuit 104, the reset circuit 105 and the processing circuit 107. The reset circuit 105 is also coupled to the analog front end circuit 103. The sampling circuit 104 is also coupled to the analog front end circuit 103 and the processing circuit 107.
The sensor array 101 is used to receive the proximity or touch of a target object. The target object is, for example, a suitable part of the human body, in particular a finger. However, the target object may be other living bodies, and is not limited to a human body.
The sensor array 101 generally includes a plurality of sensing electrodes (not shown) and a plurality of sensing circuits (not shown). The sensing circuits are connected with the sensing electrodes in a one-to-one correspondence mode. Generally, the plurality of sensing electrodes are closer to the target object than the plurality of sensing circuits. In some embodiments, the sensing circuit comprises, for example, a control switch for controlling whether to transmit an excitation signal TX to the sensing electrode. The sensing circuit may also or alternatively include other suitable circuitry. The sensing circuit may correspond to different types of the biological information sensing device.
In this embodiment, the plurality of sensing electrodes are, for example, capacitively coupled to the target object. Accordingly, the biological information sensing device is a capacitive sensing device. However, the biological information sensing device of the present invention is not limited thereto, and the biological information sensing device may be other suitable types of sensing devices, such as various suitable types of sensing devices, such as an optical type, an ultrasonic type, an infrared type, and the like, or a device in which a capacitive type sensing device is combined with other suitable types of sensing devices.
The driving circuit 102 is used to provide an excitation signal TX to the sensor array 101 for performing biometric information sensing. The biological characteristic information is any one or more of fingerprint information, palm print information, ear print information and the like. However, the biometric information is not limited to the various information listed herein, and may include or be other suitable biometric information, such as pulse, blood oxygen, heartbeat, etc. Accordingly, the biological information sensor device 100 may be any one or combination of fingerprint sensor device, palm print sensor device, ear print sensor device, etc.
The analog front end circuit 103 is configured to receive a sensing signal from the sensor array 101. In some embodiments, the analog front end circuit 103 amplifies the received sensing signal, for example, and outputs the amplified sensing signal to the sampling circuit 104. However, the analog front-end circuit 103 may alternatively perform other processing on the received sensing signal, and is not limited to amplification.
The sampling circuit 104 is used for sampling the signal output by the analog front-end circuit 103 at intervals. In this embodiment, the sampling circuit 104 is further configured to perform analog-to-digital conversion on the sampled analog signal, and output the converted digital signal to the processing circuit 107. However, the present invention is not limited to this, and alternatively, in other embodiments, the analog-to-digital conversion function may be disposed in the processing circuit 107.
The Reset circuit 105 is used for outputting a Reset signal Reset to Reset the sensor array 101 and the analog front-end circuit 103. In this embodiment, when the Reset signal Reset received by the sensor array 101 and the analog front-end circuit 103 is at a high level, the sensor array 101 and the analog front-end circuit 103 are Reset to a predetermined state. When the Reset signal Reset received by the sensor array 101 and the analog front end circuit 103 is low, the sensor array 101 and the analog front end circuit 103 are not Reset. Alternatively, in other embodiments, the sensor array 101 and the analog front end circuit 103 may be Reset when the received Reset signal Reset is low, and not Reset when the received Reset signal Reset is high.
The processing circuit 107 receives the sampling signal output from the sampling circuit 104 and obtains corresponding information according to the sampling signal.
Specifically, for example, when the biological information sensing apparatus 100 performs common mode interference detection, the processing circuit 107 receives the sampling signal output from the sampling circuit 104, and processes and analyzes (e.g., fourier transform, etc.) the sampling signal to obtain the condition that the common mode interference exists. The control circuit 106 correspondingly controls whether the biological information sensing apparatus 100 switches from performing common mode interference detection to performing biological information sensing according to the common mode interference condition obtained by the processing circuit 107.
As another example, when the biological information sensing apparatus 100 performs biological information sensing, the processing circuit 107 obtains biological characteristic information from the sampling signal from the sampling circuit 104. The processing circuit 107 may further output corresponding information or instructions to a system side of the electronic device 300 (see fig. 5) to control the electronic device 300 to perform corresponding functions, such as template registration, screen unlocking, online payment, and the like.
the control circuit 106 is used for controlling the biological information sensing apparatus 100 to perform common mode interference detection and biological information sensing.
When the biological information sensing device 100 performs common-mode interference detection, the control circuit 106 controls the driving circuit 102 not to output the excitation signal TX to the sensor array 101, controls the reset circuit 105 to reset the sensor array 101 and the analog front-end circuit 103, and further controls the sampling circuit 104 to sample the signal output by the analog front-end circuit 103 at intervals after resetting the sensor array 101 and the analog front-end circuit 103, and the processing circuit 107 confirms that the biological information sensing device 100 has common-mode interference according to the signal sampled by the sampling circuit 104. The sampling circuit 104 performs correlated double sampling on a signal output from the analog front-end circuit 103, for example.
the control circuit 106 controls whether the biological information sensing apparatus 100 is switched from performing common mode interference detection to performing biological information sensing according to the confirmation result of the processing circuit 107.
The stage in which the biological information sensing apparatus 100 performs the common mode interference detection is defined as a common mode interference detection stage, and the stage in which the biological information sensing apparatus 100 performs the biological information detection is defined as a biological information detection stage.
For example, the common mode interference detection phase includes at least one first setting period T1. In a first setting period T1, the driving circuit 102 does not output the excitation signal TX to the sensor array 101, and after the reset circuit 105 resets the sensor array 101 and the analog front-end circuit 103, the control circuit 106 outputs a first control signal and a second control signal to the sampling circuit 104 at intervals, and controls the sampling circuit 104 to sample the signal output by the analog front-end circuit 103 at intervals to obtain a first sampling signal and a second sampling signal. The processing circuit 107 is configured to analyze the first sampling signal and the second sampling signal to generate a detection result. The control circuit 106 determines whether to control the biological information sensing apparatus 100 to enter the biological information detection stage according to the detection result.
in the stage of detecting biological information, the control circuit 106 is used for controlling the reset circuit 105 to reset the sensor array 101 and the analog front-end circuit 103, and controlling the driving circuit 102 to generate an excitation signal TX to the sensor array 101 after the sensor array 101 and the analog front-end circuit 103 are reset, and the sensor array 101 outputs a corresponding biological information detection signal to the analog front-end circuit 103 to perform biological information detection.
In the common mode interference detection stage before the biological information detection stage, the number of the first setting periods T1 and the length of each first setting period T1 may be configured according to practical situations. In some examples, the output time interval of the first control signal and the second control signal may be configured according to the sensitivity of the biological information sensing apparatus 100 in each first setting period T1. For example, when the output time interval of the adjacent first control signal and second control signal is long, the sensitivity of the biological information sensing apparatus 100 is low; when the output time interval of the adjacent first control signal and second control signal is short, the sensitivity of the biological information sensing apparatus 100 is high.
It should be noted that the timing diagram of the signals shown in fig. 4 can be understood as outputting no signal or generating no signal when a certain signal (e.g., the activation signal TX) is low, and can be understood as outputting or generating a signal when a certain signal is high. Also, fig. 4 schematically shows one first setting period T1.
Preferably, the biological information sensing apparatus 100 can detect whether there is common mode interference and the signal frequency of the common mode interference in the common mode interference detection stage. For example, the processing circuit 107 performs fourier transform or the like on the collected first sampling signal and second sampling signal to determine the signal frequency of the common mode interference.
Further, the processing circuit 107 performs fourier transform or the like on the collected first sampling signal and second sampling signal to determine the signal amplitude of the common mode interference.
Further, the processing circuit 107 performs fourier transform or the like on the collected first sampling signal and second sampling signal to determine the signal phase of the common mode interference.
In some embodiments, the control circuit 106 is configured to alternately output the first control signal and the second control signal to the sampling circuit 104 during the first setting period T1.
therefore, the first control signal and the second control signal are alternately output at intervals, so that the information of the common-mode interference, such as signal frequency, signal amplitude, signal phase and the like, can be accurately acquired. The number of alternation can be configured according to actual conditions.
if the bioinformation sensing device 100 is controlled to enter the bioinformation detection phase, the control circuit 106 further determines whether to control the driving circuit 102 to adjust the frequency of the excitation signal TX to reduce the influence of the common mode interference according to the detection result of the processing circuit 107.
in some embodiments, when the processing circuit 107 determines that the biological information sensing apparatus 100 has the common mode interference, the control circuit 106 controls the biological information sensing apparatus 100 to enter the common mode interference detection stage again after selecting the delay setting time.
in particular, common mode interference may be non-continuously unstable interference. Therefore, when the common-mode interference detection stage is performed once, the processing circuit 107 determines that the common-mode interference exists, but the common-mode interference may disappear after a period of time elapses. Therefore, by delaying the set time and then performing the common mode interference detection stage, the processing circuit 107 may obtain different detection results. The control circuit 106 can select to control the bioinformation sensing device 100 to perform bioinformation detection when there is no common mode interference. Compared with a means for eliminating common mode interference in the biological information detection stage, the biological information detection signal obtained by the biological information sensing device 100 has a higher signal-to-noise ratio, and the method is simpler.
the setting time can be configured according to the actual situation.
In some embodiments, when the processing circuit 107 determines that the biological information sensing apparatus 100 does not have the common mode interference, the control circuit 106 is configured to selectively control the biological information sensing apparatus 100 to enter the biological information detection phase according to the detection result. In this case, the driving circuit 102 may not need to adjust the frequency of the excitation signal TX.
therefore, when there is no common mode interference, the control circuit 106 controls the biological information sensing apparatus 100 to enter the biological information detection stage, so that the signal-to-noise ratio of the biological information detection signal obtained by the biological information sensing apparatus 100 is higher. For example, in the biological information detection stage, when the biological information detection is required, the control circuit 106 controls the excitation signal of the set frequency to be generated and output to the sensor array 101, and the biological information detection is performed by the sensor array 101.
The signal output from the sensor array 101 is amplified by the analog front-end circuit 103 and then output to the sampling circuit 104. The sampling circuit 104 samples and analog-to-digital converts the sensing signal output from the analog front-end circuit 103, and outputs the converted sensing signal to the processing circuit 107. The processing circuit 107 acquires biometric information from the received sensing signal.
In some embodiments, when the processing circuit 107 determines that the biological information sensing apparatus 100 has common-mode interference, the control circuit 106 is configured to selectively control the biological information sensing apparatus 100 to enter a biological information detection phase according to the detection result, and control the driving circuit 102 to adjust the frequency of the excitation signal TX to eliminate the influence of the common-mode interference.
Specifically, when the biological information sensing device 100 has common-mode interference, the processing circuit 107 determines the signal frequency of the common-mode interference by analyzing the first sampling signal and the second sampling signal, so as to be the basis for the control circuit 106 to control the driving circuit 102 to adjust the frequency of the excitation signal TX during the biological information detection phase. When the signal frequency of the common-mode interference is small, the frequency of the excitation signal TX may be increased, for example, the frequency of the excitation signal TX is adjusted to be twice the signal frequency of the common-mode interference; when the signal frequency of the common-mode interference is larger, the frequency of the excitation signal TX may be reduced, for example, the frequency of the excitation signal TX is adjusted to be half of the signal frequency of the common-mode interference.
In some examples, when the processing circuit 107 determines that the frequency of the common mode interference signal is 100KHz, the control circuit 106 may control the driving circuit 102 to adjust the frequency of the excitation signal TX to be 200 KHz; when the processing circuit 107 determines that the frequency of the common mode interference signal is 200KHz, the control circuit 106 may control the driving circuit 102 to adjust the frequency of the driving signal TX to be 100 KHz.
It should be noted that the frequency of the adjusted excitation signal TX cannot be greater than the bandwidth of the biological information sensing apparatus 100, so as to avoid the problem that the excitation signal TX cannot be output.
In some embodiments, referring to fig. 4, the biological information detecting stage includes at least one second setting period T2, and during the second setting period T2, after the sensor array 101 and the analog front-end circuit 103 are reset by the reset circuit 105 and before the driving circuit 102 outputs the excitation signal TX to the sensor array 102, the control circuit 106 outputs a first control signal to the sampling circuit 104, and the sampling circuit 104 samples a signal output by the analog front-end circuit 103 to obtain a third sampling signal. When the driving circuit 102 outputs the excitation signal TX to the sensor array 101, the control circuit 106 outputs the second control signal to the sampling circuit 104, and the sampling circuit 104 samples the signal output by the analog front-end circuit 103 to obtain a fourth sampling signal.
The processing circuit 106 eliminates interference on the biological information detection signal based on the third sampling signal and the fourth sampling signal. Wherein the fourth sampling signal includes a biological information detection signal and an interference signal. Therefore, the fourth sampling signal minus the third sampling signal can be a biological information detection signal, thereby reducing interference signals and further improving the signal-to-noise ratio of the fingerprint detection signal.
The number of the second setting periods T2 and the length of each second setting period T2 may be configured according to practical situations. It is noted that fig. 4 schematically shows a second setting period T2.
Referring to fig. 5, fig. 5 is a schematic structural diagram of an embodiment of an electronic device according to the invention. The electronic device 300 includes the biological information sensing apparatus 100 according to any of the above embodiments.
therefore, in the electronic device 300, in the common mode interference detection stage, the control circuit 106 of the biological information sensing apparatus 100 performs the correlated double sampling by the two control signals at different times to generate the detection result, and controls the biological information sensing apparatus 100 to operate according to the detection result, so as to avoid the influence of the common mode interference signal on the biological information detection signal, and further improve the signal-to-noise ratio of the biological information detection signal of the biological information sensing apparatus 100.
Specifically, the electronic device 300 is, for example, a portable electronic product, a home-based electronic product, or a vehicle-mounted electronic product. The portable electronic products are various mobile terminals, such as mobile phones, tablet computers, notebook computers, wearable products and other suitable electronic products; home-furnishing electronic products are various appropriate electronic products such as intelligent door locks, televisions, refrigerators, desktop computers and the like; the vehicle-mounted electronic product is, for example, a navigator, a vehicle-mounted DVD, or the like.
In some embodiments, the electronic device 300 includes a housing 304, the biological information sensing apparatus 100 is located in the housing 304, the housing 304 is opened with a through hole 306, and the through hole 306 exposes the biological information sensing apparatus 100.
Therefore, the through hole 306 can help the user to locate the finger and the biological information sensing device 100 when the user inputs the fingerprint, which is convenient for the user to operate. In the present example, the through hole 306 is a circular through hole, and it is understood that the through hole 306 may be a square through hole, an oval through hole, or other shapes. The through hole 306 may be opened at a rear position of the housing 304.
The biological information sensing apparatus 100 may be disposed at a suitable position such as the front or side of the electronic device 300. Further, the biological information sensing apparatus 100 may also be disposed inside the electronic device 300, and the biological information sensing apparatus 100 is not necessarily exposed through the through hole.
In addition, when the electronic device 300 is a mobile terminal, the control circuit 106 may be activated to perform the interference detection stage and the biological information detection stage in different manners. In one mode, when the user presses a switch to trigger the biological information sensing device 100 to perform biological information detection, the control circuit 106 receives a control signal generated by pressing the switch by the user, and then performs common mode interference detection and then performs biological information sensing.
Alternatively, when the user does not need to press a switch to trigger the biological information sensing device 100 for detecting the biological information, the control circuit 106 may control the biological information sensing device 100 to perform the common mode interference detection at intervals, and perform the biological information detection sensing when the control circuit 106 receives the related information to be detected.
In the description herein, references to the description of the terms "one embodiment," "certain embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and not to be construed as limiting the present invention, and those skilled in the art can make changes, modifications, substitutions and alterations to the above embodiments within the scope of the present invention.
Claims (11)
1. A biological information sensing apparatus comprising:
An array of sensors;
a drive circuit for providing an excitation signal to the sensor array to perform biological information sensing;
an analog front end circuit for receiving a sensing signal from the sensor array output;
The sampling circuit is used for sampling a signal output by the analog front-end circuit;
A reset circuit for outputting a reset signal to reset the sensor array and the analog front-end circuit;
A control circuit connected to the driving circuit, the sampling circuit, and the reset circuit, respectively; and
The processing circuit is connected with the sampling circuit;
When the biological information sensing device carries out common mode interference detection, the control circuit controls the drive circuit not to output the excitation signal to the sensor array, and controls the reset circuit to reset the sensor array and the analog front-end circuit, and after the sensor array and the analog front-end circuit are reset, the sampling circuit is further controlled to carry out interval sampling on the signal output by the analog front-end circuit, a first sampling signal and a second sampling signal are obtained, and the processing circuit confirms whether common mode interference exists in the biological information sensing device according to the analysis of the detection results generated by the first sampling signal and the second sampling signal.
2. the biological information sensing apparatus according to claim 1, wherein: when the processing circuit confirms that the biological information sensing device has common-mode interference, the signal frequency of the common-mode interference is further analyzed.
3. The biological information sensing apparatus according to claim 2, wherein: the control circuit controls whether the biological information sensing device is switched from performing common mode interference detection to performing biological information sensing according to the confirmation result of the processing circuit.
4. The biological information sensing apparatus according to claim 3, wherein: when the processing circuit confirms that the biological information sensing device does not have common mode interference, the control circuit drives the sensor array to perform biological information sensing by controlling the reset circuit to reset the sensor array and the analog front-end circuit and further controlling the driving circuit to provide an excitation signal to the sensor array after resetting the sensor array and the analog front-end circuit.
5. The biological information sensing apparatus according to claim 3, wherein: when the processing circuit confirms that the biological information sensing device has common-mode interference, the control circuit controls the biological information sensing device to continuously execute common-mode interference detection; or, the control circuit controls the reset circuit to reset the sensor array and the analog front-end circuit, and controls the driving circuit to adjust the frequency of the excitation signal, and after the sensor array and the analog front-end circuit are reset, controls the driving circuit to output the excitation signal with the adjusted frequency to the sensor array so as to drive the sensor array to perform biological information sensing.
6. The biological information sensing apparatus according to claim 4 or 5, wherein: when the driving circuit provides the excitation signal to the sensor array to perform biological information sensing, the analog front-end circuit receives a sensing signal output by the sensor array and outputs a corresponding signal to the sampling circuit, the sampling circuit performs sampling and analog-to-digital conversion on the received sensing signal and outputs the converted signal to the processing circuit, and the processing circuit is used for obtaining biological characteristic information according to the signal from the sampling circuit.
7. The biological information sensing apparatus according to claim 1, wherein: the control circuit controls the biological information sensing device to perform a plurality of times of common mode interference detection before performing biological information sensing.
8. The biological information sensing apparatus according to claim 1, wherein: when the biological information sensing device executes common-mode interference detection, the sampling circuit carries out related double sampling on the sensing signal output by the analog front-end circuit.
9. The biological information sensing apparatus according to claim 1, wherein: when the processing circuit confirms that the biological information sensing device has common-mode interference, analyzing at least one of the following:
Signal frequency of common mode interference;
Signal amplitude of common mode interference;
Signal phase of common mode interference.
10. An electronic device comprising the biological information sensing apparatus according to any one of claims 1 to 9.
11. A common mode interference detection method of a biological information sensing apparatus, wherein the biological information sensing apparatus comprises:
An array of sensors;
A drive circuit for providing an excitation signal to the sensor array to perform biological information sensing;
An analog front end circuit for receiving a sensing signal from the sensor array output; and
A reset circuit for outputting a reset signal to reset the sensor array and the analog front-end circuit;
The common-mode interference detection method comprises the following steps:
Controlling the drive circuit not to output the excitation signal to the sensor array;
Controlling the reset circuit to reset the sensor array and the analog front-end circuit;
After the sensor array and the analog front-end circuit are reset, carrying out interval sampling on signals output by the analog front-end circuit to obtain a first sampling signal and a second sampling signal; and
And judging whether the biological information sensing device has common-mode interference or not according to the detection result generated by analyzing the first sampling signal and the second sampling signal.
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| CN201710153273.3A CN107122703B (en) | 2017-03-15 | 2017-03-15 | Biological information sensing device, electronic apparatus, and common mode interference detection method |
| PCT/CN2017/101613 WO2018166155A1 (en) | 2017-03-15 | 2017-09-13 | Biometric sensing device, electronic device, and common-mode interference detection method |
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| WO2021023125A1 (en) * | 2019-08-02 | 2021-02-11 | Bionime Corporation | Micro biosensor and method for reducing measurement interference using the same |
| CN113671471B (en) * | 2021-08-18 | 2024-04-30 | 中国科学院声学研究所北海研究站 | Underwater sound target detection blind source separation method |
| CN114323179A (en) * | 2021-12-09 | 2022-04-12 | 湖南威铭能源科技有限公司 | Non-magnetic metering filtering method and device for intelligent water meter |
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| CN103810479A (en) * | 2014-02-28 | 2014-05-21 | 成都费恩格尔微电子技术有限公司 | Fingerprint collection system and fingerprint information collection method |
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| CN206610309U (en) * | 2017-03-15 | 2017-11-03 | 深圳信炜科技有限公司 | Biological information sensing device and electronic equipment |
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| NO20131424A1 (en) * | 2013-10-28 | 2015-04-29 | Idex Asa | Method and apparatus for reduced cross talk and ASIC area in a fingerprint sensor. |
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| CN103810479A (en) * | 2014-02-28 | 2014-05-21 | 成都费恩格尔微电子技术有限公司 | Fingerprint collection system and fingerprint information collection method |
| CN106062775A (en) * | 2014-12-22 | 2016-10-26 | 指纹卡有限公司 | Capacitive fingerprint sensor with sensing elements comprising timing circuitry |
| CN206610309U (en) * | 2017-03-15 | 2017-11-03 | 深圳信炜科技有限公司 | Biological information sensing device and electronic equipment |
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