KR102314869B1 - Receiver for removing noise generated in human body communication - Google Patents

Abstract

The present invention includes a first filter circuit, a second filter circuit, and an amplifier. The first filter circuit provides a first path for first frequency components of the input frequency components equal to or less than a first cutoff frequency, and passes second frequency components of the input frequency components excluding the first frequency components to the second path. pass through The second filter circuit attenuates third frequency components below the second cutoff frequency among the second frequency components. The amplifier amplifies the second frequency components including the attenuated third frequency components.

Description

Receiver for removing noise generated from human body communication

The present invention relates to a receiver, and more particularly, to a receiver configured to remove noise generated in the process of transmitting a signal through a human body.

As information technology develops, communication technology between electronic devices also develops. In particular, as wireless communication technology develops, electronic devices exchange signals through various media. In order to transmit/receive signals through various media, electronic devices include interface circuits for supporting various protocols.

As interest in ubiquitous technology and the bio industry increases, human body communication technology that transmits signals through the human body is attracting attention. Human body communication technology is being applied not only to mobile devices such as wearable devices, but also to various electronic devices designed for medical purposes.

A lot of noise can be generated while the signal is transmitted through the human body. In order to efficiently receive a signal transmitted through the human body, a high-performance receiver is required. For example, there is a need for a receiver configured to cancel noise generated during transmission through the human body.

The present invention may provide a receiver configured to cancel noise generated in human body communication.

According to an aspect of the present invention, a receiver according to an embodiment of the present invention may include a first filter circuit, a second filter circuit, and an amplifier. The first filter circuit provides a first path for first frequency components of the input frequency components equal to or less than a first cutoff frequency, and passes second frequency components of the input frequency components excluding the first frequency components to the second path. can be passed through. The second filter circuit may attenuate third frequency components equal to or less than the second cutoff frequency among the second frequency components. The amplifier may amplify the second frequency components including the attenuated third frequency components.

According to an aspect of the present invention, a receiver according to an embodiment of the present invention may include a filter circuit and an amplifier. Among the reference frequency components received through the first node, first frequency components equal to or less than the first cut-off frequency are passed to the second node, and among the input frequency components received through the second node, the second frequency components equal to or less than the first cut-off frequency are passed. The frequency components may be passed to the first node. The amplifier may perform an amplification operation based on third frequency components excluding the first frequency components among the reference frequency components and fourth frequency components excluding the second frequency components among the input frequency components.

According to an aspect of the present invention, a receiver according to an embodiment of the present invention may include a filter circuit and an amplifier. Noise included in the input signal received through the first node may pass to the second node, and the reference signal may be received through the second node. The amplifier may output biosignal data by amplifying a difference between the level of the biosignal included in the input signal and the level of the reference signal. The frequency of the noise may be lower than the frequency of the biosignal.

According to an embodiment of the present invention, noise generated in human body communication is effectively removed, and thus data transmitted in human body communication is accurately received.

1 is a block diagram illustrating a human body communication system according to an embodiment of the present invention.
FIG. 2 is a conceptual diagram showing an exemplary configuration of the receiver of FIG. 1 .
3 is a graph showing signals received by the receiver of FIG.
4 is a conceptual diagram illustrating an exemplary configuration of the receiver of FIG. 1 .
5 is a circuit diagram showing an exemplary configuration of the receiver of FIG.
FIG. 6 is a graph for explaining operations of the filter circuit of FIG. 4 .
7 is a conceptual diagram illustrating an exemplary configuration of the receiver of FIG. 1 according to an embodiment of the present invention.
FIG. 8 is a circuit diagram showing an exemplary configuration of the receiver of FIG. 7 .
FIG. 9 is a graph for explaining operations of the filter circuit of FIG. 7 .
10 is a graph for explaining operations of the receiver of FIG.
11 is a block diagram illustrating an exemplary configuration of an electronic device including the human body communication system of FIG. 1 .

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description, details such as detailed configurations and structures are simply provided to help the general understanding of the embodiments of the present invention. Therefore, modifications of the embodiments described herein may be performed by those skilled in the art without departing from the spirit and scope of the present invention. Moreover, descriptions of well-known functions and structures are omitted for the sake of clarity and brevity. The terms used in this specification are terms defined in consideration of the functions of the present invention, and are not limited to specific functions. Definitions of terms may be determined based on matters described in the detailed description.

Circuits in the following drawings or detailed description may be connected to other elements other than those shown in the drawings or described in the detailed description. The connections between circuits or components may be direct or non-direct, respectively. A connection between circuits or components may be a communication connection or a physical connection, respectively.

Unless otherwise defined, all terms including technical or scientific meanings used herein have meanings that can be understood by those of ordinary skill in the art to which the present invention belongs. In general, terms defined in the dictionary are interpreted to have the same meaning as the contextual meaning in the related technical field, and unless clearly defined in the text, they are not interpreted to have an ideal or excessively formal meaning.

1 is a block diagram illustrating a human body communication system according to an embodiment of the present invention.

Referring to FIG. 1 , a human body communication system 1000 may include a transmitter 1100 and a receiver 1200 communicating through a human body 10 . Although exemplary configurations and operations of the human body communication system 1000 that communicate via the human body 10 will be described herein, it will be understood that the human body communication system 1000 may communicate via various media. For example, the medium of the human body communication system 1000 may be changed and modified into various living bodies such as animals and plants.

For example, the transmitter 1100 and the receiver 1200 may be included in an electronic device for configuring the human body communication system 1000 (refer to FIG. 11 ). For example, the electronic device may be one of a personal computer (PC), a workstation, a notebook computer, a mobile device, a wearable device, and the like. The electronic device may further include at least one component (eg, a processor, a memory, a storage, etc.) not shown in FIG. 1 . Alternatively, the electronic device may not include at least one of the components shown in FIG. 1 .

The transmitter 1100 may transmit a signal (hereinafter, referred to as a biosignal) including various information through the human body 10 . For example, the biosignal may include information for an operation of the electronic device including the human body communication system 1000 . The transmitter 100 may be in contact with the human body 10 or may be spaced apart from the epidermis of the human body 10 by a small interval to transmit the biological signal. For example, the transmitter 1100 may support various types of protocols for transmitting a biosignal through the human body 10 .

The biosignal transmitted from the transmitter 1100 may represent data to be processed or processed by various components included in the electronic device. The biosignal data may be related to various types of information transmitted from the outside of the human body communication system 1000 . For example, information included in the biosignal may be expressed as data to be processed by a processor included in the electronic device. For example, the biosignal information may be expressed as data to be stored in a memory included in the electronic device.

The receiver 1200 may receive the biosignal transmitted through the human body 10 . For example, the receiver 1200 may support various types of protocols for receiving a biosignal through the human body 10 . The receiver 1200 may acquire data of the received biosignal. The receiver 1200 may acquire information included in the biosignal (ie, information obtained from the outside of the human body communication system 1000) based on data obtained from the biosignal.
Although not shown in FIG. 1 , the receiver 1200 may receive a reference signal to be used to amplify a biosignal from the outside of the human body communication system 1000 . For example, the receiver 1200 may receive the reference signal from the ground outside the human body communication system 1000 or from the air.
Also, the receiver 1200 may receive a signal including noise (hereinafter, referred to as a noise signal) through the human body 10 . For example, noise may be generated inside the human body communication system 1000 by energy supplied from the outside of the human body 10 . For example, energy radiated by a light source (eg, a fluorescent lamp) external to the human body 10 may be absorbed by the human body 10 . A noise signal may be generated inside the human body by the absorbed energy. The receiver 1200 may receive a noise signal generated in the human body 10 .
The receiver 1200 may perform an amplification operation based on a signal received from the transmitter 1100, a reference signal, and a noise signal in order to accurately acquire biosignal data. That is, the receiver 1200 may perform an amplification operation to accurately acquire data of the biosignal weakened in the process of being received through the human body 10 . For example, the receiver 1200 may perform an amplification operation based on a difference between a level of a signal received from the transmitter 1100 and a level of a reference signal.
The receiver 1200 may perform operations for removing noise included in the noise signal in order to accurately acquire data of the biosignal. 2-10, exemplary configurations and operations of the receiver 1200 will be described in more detail.
FIG. 2 is a conceptual diagram showing an exemplary configuration of the receiver of FIG. 1 .
The receiver 1200 of FIG. 1 may include the receiver 1200_1 of FIG. 2 . Referring to FIG. 2 , a receiver 1200_1 may include electrodes EN1 and EN2 and an amplifier 1210 .
The receiver 1200_1 may receive the reference signal INR from the outside of the human body communication system 1000 through the electrode EN1 . The receiver 1200_1 may receive the biosignal INS transmitted from the transmitter 1100 through the human body 10 through the electrode EN2 . The receiver 1200_1 may receive the noise signal NS generated in the human body 10 through the electrode EN2 .
Since both the noise signal NS and the biosignal INS are received through the electrode EN2 , the receiver 1200_1 receives an input signal including the biosignal INS and the noise signal NS through the electrode EN1 . (IN) can be received. For example, the level of the input signal IN may correspond to the sum of the level of the living body INS and the level of the noise signal NS. Referring to FIG. 3 , the biosignal INS, the noise signal NS, and the input signal IN will be described in more detail.
The amplifier 1210 may receive the reference signal INR through the inverting terminal and the input signal IN through the non-inverting terminal. The amplifier 1210 may output the signals OUT11 and OUT12 based on the reference signal INR and the input signal IN. For example, the amplifier 1210 may output the signals OUT11 and OUT12 based on a difference between the level of the reference signal INR and the level of the input signal IN.
For example, when the gain of the amplifier 1210 is K, the levels of the signals OUT11 and OUT12 are the values obtained by multiplying the difference between the level of the reference signal INR and the level of the input signal IN by K. can respond. The levels of signals OUT11 and OUT12 may be complementary. Accordingly, the sum of the levels of the signals OUT11 and OUT12 may be uniform. However, in the present specification, uniform means that a specific value does not change with time or changes only slightly.
Since the signals OUT11 and OUT12 are generated based on the input signal IN including the biosignal INS, the signals OUT11 and OUT12 may represent data of the biosignal INS. As described with reference to FIG. 1 , the receiver 1200_1 may output the signals OUT11 and OUT12 to the component in order to transmit data of the biosignal INS to another component of the electronic device. .
3 is a graph showing signals received by the receiver of FIG.
As described with reference to FIGS. 1 and 2 , the receiver 1200 may receive a biosignal INS received from the transmitter 1100 through the human body 10 and a noise signal NS including noise. can The noise signal NS may include noise of a relatively low frequency. In the example of FIG. 3 , the frequency of the noise signal NS may be F1, and the frequency of the biosignal INS may be F2. Since the noise signal NS includes noise having a low frequency, the frequency of the noise signal NS may be lower than that of F1 and the frequency of the biosignal INS may be lower than that of F2.
As the noise signal NS and the biosignal INS are received through the electrode EN2 , the input signal IN may be generated. The input signal IN may include a noise signal NS and a biosignal INS. Accordingly, the input signal IN may include noise. For example, the input signal IN may include noise of frequency F1.
4 is a conceptual diagram illustrating an exemplary configuration of the receiver of FIG. 1 .
The receiver 1200 of FIG. 1 may include the receiver 1200_2 of FIG. 4 . Referring to FIG. 4 , a receiver 1200_2 may include electrodes EN1 and EN2 , an amplifier 1210 , and a filter circuit 1220 . Comparing FIG. 4 with FIG. 2 , the receiver 1200_2 of FIG. 4 may further include a filter circuit 1220 .
Exemplary configurations and operations of the electrodes EN1 and EN2 and the amplifier 1210 are similar to those described with reference to FIG. 2 , respectively, and thus overlapping description will be omitted below. The filter circuit 1220 may receive the input signal IN from the electrode EN1 . The filter circuit 1220 may receive the reference signal INR from the electrode EN2 . The filter circuit 1220 may receive an operating voltage VDD and a ground voltage.
For example, the filter circuit 1220 may receive the operating voltage VDD from an electronic device such as a voltage supply inside or outside the receiver 1200_2 . The operating voltage VDD may have an appropriate level for the operation of the amplifier 1210 . For example, the operating voltage VDD may have a level set by a designer for a normal operation of the amplifier 1210 .
The filter circuit 1220 may receive a ground voltage from a ground terminal. In the example of FIG. 4 , a filter circuit 1220 configured to receive a ground voltage from a ground terminal will be described, however, it is noted that the ground voltage may be changed and modified to various levels of voltage for normal operation of the amplifier 1210 . will be understood
The filter circuit 1220 may output the signals INN1 and INP1 based on the input signal IN and the reference signal INR. The filter circuit 1220 may be configured to remove noise included in the input signal IN. For example, the filter circuit 1220 may be configured to attenuate frequency components equal to or less than a cutoff frequency among frequency components of the input signal IN and the reference signal INR. For example, the filter circuit 1220 may include a configuration of a high pass filter.
The cutoff frequency of the filter circuit 1220 may be determined in consideration of the frequency F1 of the noise signal NS and the frequency F2 of the biosignal INS. For example, the filter circuit 1220 may be designed such that the cutoff frequency of the filter circuit 1220 is greater than the frequency F1 of the noise signal NS and less than the frequency F2 of the biosignal INS.
The filter circuit 1220 may attenuate frequency components less than or equal to the cutoff frequency among frequency components of the reference signal INR, and output the signal INN1 including the attenuated frequency components to the inverting terminal of the amplifier 1210 . . The filter circuit 1220 attenuates frequency components below the cutoff frequency among frequency components of the input signal IN, and outputs the signal INP1 including the attenuated frequency components to the non-inverting terminal of the amplifier 1210 . have.
The amplifier 1210 may output the signals OUT21 and OUT22 based on the signals INN1 and INP1 . For example, the amplifier 1210 may output the signals OUT21 and OUT22 having a level obtained by multiplying a difference between the levels of the signals INN1 and INP1 by a gain.
With reference to FIG. 5 , an exemplary configuration of the filter circuit 1220 will be described in more detail. With reference to FIG. 6 , exemplary operations of the filter circuit 1220 will be described in more detail.
5 is a circuit diagram showing an exemplary configuration of the receiver of FIG.
Referring to FIG. 5 , the filter circuit 1220 may include resistors R1 to R4 and capacitive elements C1 and C2 .
In FIG. 5 , each of the capacitive elements C1 and C2 is shown as one capacitive element, but each of the capacitive elements C1 and C2 is a capacitive element connected in parallel instead of one capacitive element. and at least one of various combinations of capacitive elements connected in series, and capacitive elements connected in parallel and capacitive elements connected in series.
In FIG. 5 , each of the resistors R1 to R4 is shown as one resistor, but each of the resistors R1 to R4 is, instead of one resistor, resistors connected in parallel, resistors connected in series, and It may include at least one of various combinations of resistors connected in parallel and resistors connected in series.
The capacitive element C1 may be connected between the electrode EN2 and the node N1 . The resistor R1 may be connected between the supply terminal of the operating voltage VDD and the node N1 . The resistor R3 may be connected between the node N1 and the ground terminal. The capacitive element C2 may be connected between the electrode EN1 and the node N2 . The resistor R2 may be connected between the supply terminal of the operating voltage VDD and the node N2 . The resistor R4 may be connected between the node N2 and the ground terminal.
The capacitive element C1 may receive the reference signal INR from the electrode EN2 . The capacitive element C1 may pass some frequency components among the frequency components of the reference signal INR. A signal INN1 including frequency components passed through the capacitive element C1 may be output to the amplifier 1210 through the node N1 .
For example, the first cut-off frequency may be determined based on the element value of the capacitive element C1. For a frequency band equal to or less than the first cut-off frequency, levels of frequency components included in the signal INN1 may be smaller than levels of frequency components included in the reference signal INR.
The capacitive element C2 may receive the input signal IN from the electrode EN1 . The capacitive element C2 may pass some of the frequency components of the input signal IN. The signal INP1 including the frequency components passed through the capacitive element C2 may be output to the amplifier 1210 through the node N2 .
For example, the second cutoff frequency may be determined based on the element value of the capacitive element C2 . For a frequency band equal to or less than the second cutoff frequency, levels of frequency components included in the signal INP1 may be smaller than levels of frequency components included in the input signal IN.
Signals INP1 and INN1 may be used as differential inputs of amplifier 1210 . Accordingly, the filter circuit 1220 may be designed so that the signals INP1 and INN1 corresponding to each other are output to the amplifier 1210 . For example, the element values of the capacitive elements C1 and C2 may be set such that the first cutoff frequency associated with the capacitive element C1 corresponds to the second cutoff frequency associated with the capacitive element C2. have.
Hereinafter, for convenience of description, an embodiment in which the first cut-off frequency and the second cut-off frequency are the same will be described. Hereinafter, both the first cutoff frequency and the second cutoff frequency are referred to as the cutoff frequency of the filter circuit 1220 . However, it will be understood that the first cutoff frequency and the second cutoff frequency may be variously changed and modified for the operations described with reference to FIG. 5 .
FIG. 6 is a graph for explaining operations of the filter circuit of FIG. 4 . In the example of FIG. 6 , the x-axis may represent a frequency, and the y-axis may represent the magnitude of the impedance of the filter circuit 1220 of FIG. 4 .
As described with reference to FIG. 5 , the filter circuit 1220 of FIG. 4 may have a cutoff frequency determined based on at least one of the capacitive elements C1 and C2 . In the example of FIG. 6 , the cut-off frequency of the filter circuit 1220 may be FC1. For the frequency of FC1, the impedance of the filter circuit 1220 may be Z1. The impedance of the filter circuit 1220 in a frequency band lower than the cutoff frequency FC1 may be greater than the impedance of the filter circuit 1220 in a frequency band higher than the cutoff frequency FC1. Accordingly, the filter circuit 1220 may attenuate a frequency component having a frequency lower than the cutoff frequency FC1 .
The frequency F1 of the noise signal NS may be lower than the cutoff frequency FC1, and the frequency F2 of the biosignal INS may be higher than the cutoff frequency FC2. Accordingly, noise included in the input signal IN may be attenuated by the filter circuit 1220 . A level of noise included in the signal INP1 may be smaller than a level of noise included in the input signal IN.
The amplifier 1210 may output the signals OUT21 and OUT22 based on the signal INP1 including little noise. Levels of noises included in signals OUT21 and OUT22 may be smaller than levels of noises included in signals OUT11 and OUT12 of FIG. 2 . Components of the electronic device including the human body communication system 1000 may operate based on the signals OUT21 and OUT22 including only a small level of noise.
7 is a conceptual diagram illustrating an exemplary configuration of the receiver of FIG. 1 according to an embodiment of the present invention.
The receiver 1200 of FIG. 1 may include the receiver 1200_3 of FIG. 7 . Referring to FIG. 7 , a receiver 1200_3 may include electrodes EN1 and EN2 , an amplifier 1210 , and filter circuits 1220 and 1230 . Comparing FIG. 7 with FIG. 2 , the receiver 1200_3 of FIG. 7 may further include filter circuits 1220 and 1230 .
Exemplary configurations and operations of the electrodes EN1 and EN2 and the amplifier 1210 are similar to those described with reference to FIG. 2 , respectively, and thus overlapping description will be omitted below. Exemplary configurations and operations of the filter circuit 1220 are respectively similar to those described with reference to FIG. 4 , and thus a redundant description will be omitted below. The filter circuit 1230 may receive the input signal IN from the electrode EN1 . The filter circuit 1230 may receive the reference signal INR from the electrode EN2 .
The filter circuit 1230 may output the signals INN21 and INP21 based on the input signal IN and the reference signal INR. The filter circuit 1230 may be configured to remove noise included in the input signal IN. For example, the filter circuit 1230 may separate frequency components below the cutoff frequency among frequency components of the reference signal INR and frequency components below the cutoff frequency among frequency components of the input signal IN. A path (a path other than a path to the amplifier circuit 1220) may be provided.
The cutoff frequency of the filter circuit 1230 may be determined in consideration of the frequency F1 of the noise signal NS and the frequency F2 of the biosignal INS. For example, the filter circuit 1220 may be designed such that the cutoff frequency of the filter circuit 1230 is greater than the frequency F1 of the noise signal NS and less than the frequency F2 of the biosignal INS.
As frequency components below the cut-off frequency included in the reference signal INR and the input signal IN are transmitted through a separate path of the filter circuit 1230 , the signals INN21 and INP21 output from the filter circuit 1230 . ), frequency components below the cutoff frequency may be attenuated. That is, noise of F1 lower than the cutoff frequency may be removed by the filter circuit 1230 .
The filter circuit 1220 may further remove noise included in the signals INN21 and INP21. The filter circuit 1220 may output the signals INN22 and INP22 by passing the signals INN21 and INP21. The amplifier 1210 may output the signals OUT31 and OUT32 based on the signals INN22 and INP22. For example, the amplifier 1210 may output the signals OUT31 and OUT32 having a level obtained by multiplying a difference between the levels of the signals INN22 and INP22 by a gain.
Referring to FIG. 8 , an exemplary configuration of the filter circuit 1230 will be described in more detail. Referring to FIG. 9 , exemplary operations of the filter circuit 1230 will be described in more detail.
FIG. 8 is a circuit diagram showing an exemplary configuration of the receiver of FIG. 7 .
Referring to FIG. 8 , the filter circuit 1230 may include an inductive element L. In FIG. 8 , the inductive element L is shown as one inductive element, but the inductive element L is, instead of one inductive element, inductive elements connected in parallel, inductive elements connected in series elements, and at least one of various combinations of inductive elements connected in series with inductive elements connected in parallel.
The inductive element L may be connected between the nodes N3 and N4. The electrode EN2 may be connected to the node N3 . The electrode EN1 may be connected to the node N4 . Exemplary configurations and operations of the electrodes EN1 and EN2 , the filter circuit 1220 , and the amplifier 1210 are respectively similar to those described with reference to FIG. 5 , and thus overlapping descriptions will be omitted below.
The inductive element L may receive the reference signal INR through the node N3 . The inductive element L may pass some frequency components among the frequency components of the reference signal INR. For example, the cut-off frequency may be determined based on the element value of the inductive element L. The inductive element L may provide a path for frequency components having a lower frequency than a cutoff frequency among frequency components included in the reference signal INR.
For a frequency band below the cutoff frequency, some frequency components included in the reference signal INR may pass through the inductive element instead of a path to the amplification circuit 1220 . Accordingly, for a frequency band below the cutoff frequency, levels of frequency components included in the signal INN21 may be smaller than levels of frequency components included in the reference signal INR.
The inductive element L may receive the input signal IN through the node N4 . The inductive element L may pass some of the frequency components of the input signal IN. For example, the inductive element L may provide a path for frequency components having a lower frequency than a cutoff frequency among frequency components included in the input signal IN.
For a frequency band below the cutoff frequency, some frequency components included in the input signal IN may pass through the inductive element instead of being transmitted to the amplifier circuit 1220 . Accordingly, for a frequency band below the cutoff frequency, levels of frequency components included in the signal INP21 may be smaller than levels of frequency components included in the input signal IN. Signals INN22 and INP22 to be provided as differential inputs of amplifier 1210 may be generated based on signals INN21 and INP21.
FIG. 9 is a graph for explaining operations of the filter circuit of FIG. 7 . In the example of FIG. 9 , the x-axis may represent a frequency, and the y-axis may represent the magnitude of the impedance of the filter circuit 1230 of FIG. 7 .
As described with reference to FIG. 8 , the filter circuit 1230 of FIG. 7 may have a cutoff frequency determined based on the inductive element L. Referring to FIG. In the example of FIG. 9 , the cutoff frequency of the filter circuit 1230 may be FC2. For the frequency of FC2, the impedance of the filter circuit 1230 may be Z2.
The impedance of the filter circuit 1230 in a frequency band lower than the cutoff frequency FC2 may be lower than the impedance of the filter circuit 1230 in a frequency band higher than the cutoff frequency FC2. Accordingly, the filter circuit 1230 may pass frequency components having a frequency lower than the cutoff frequency FC2 between the nodes N3 and N4.
The frequency F1 of the noise signal NS may be lower than the cutoff frequency FC2, and the frequency F2 of the biosignal INS may be higher than the cutoff frequency FC2. The noise of the noise signal NS included in the input signal IN may be transmitted through a path provided by the filter circuit 1230 (ie, a path between the nodes N3 and N4 ). Accordingly, the level of noise included in the signal INP21 may be smaller than the level of noise included in the input signal IN.
Since the signal INP22 is generated based on the signal INP21 including the low noise, the amplifier 1210 may output the signals OUT31 and OUT32 based on the signal INP22 including the low noise. . Levels of noises included in the signals OUT21 and OUT22 may be smaller than levels of noises included in signals OUT11 and OUT12 of FIG. 2 and signals OUT21 and OUT22 of FIG. 4 . Components of the electronic device including the human body communication system 1000 may operate based on signals OUT31 and OUT32 including only low noise. Accordingly, the components of the electronic device may accurately acquire data of the signals OUT31 and OUT32.
10 is a graph for explaining operations of the receiver of FIG.
The input signal IN may be received through the electrode EN1 , and the reference signal INR may be received through the electrode EN2 . The input signal IN may include noise having a relatively low frequency.
Noise included in the input signal IN and the reference signal INR may be removed by the filter circuits 1220 and 1230 . Accordingly, when the signal INP22 is compared with the input signal IN, the level of the low frequency component included in the signal INP22 may be smaller than the level of the low frequency component included in the input signal IN. Also, when the signal INN22 is compared with the reference signal INR, the level of the low frequency component included in the signal INM22 may be smaller than the level of the low frequency component included in the reference signal INR.
The amplifier 1210 may output a signal OUT31 based on the signals INP22 and INN22 . The level of the signal OUT31 may be related to a difference between the levels of the signals INP22 and INN22. For example, the level of the signal OUT31 may have a value obtained by multiplying a difference between the levels of the signals INP22 and INN22 by the gain of the amplifier 1210 . Accordingly, the magnitude of the signal OUT31 may be greater than the magnitude of the signal INP22.
11 is a block diagram illustrating an exemplary configuration of an electronic device including the human body communication system of FIG. 1 .
Electronic device 2000 includes processor 2100 , memory 2200 , storage 2300 , user interface 2400 , security module 2500 , communication device 2600 , power manager 2700 , and bus 2800 . may include. However, the components of the electronic device 2000 are not limited to the embodiment of FIG. 11 . The electronic device 2000 may not include one or more of the components shown in FIG. 11 . Alternatively, the electronic device 2000 may further include at least one component not shown in FIG. 11 .
The processor 2100 may control/manage operations of components of the electronic device 2000 . For example, the processor 2100 may be implemented as a general-purpose processor, a dedicated processor, or an application processor.
For example, the processor 2100 may include one processor core (Single Core), or a plurality of processor cores (Multi-Core) (eg, dual-core, quad-core, hexa-core). (Multi-Core) such as (Hexa-Core) may be included. For example, the processor 2100 may include a dedicated circuit (eg, Field Programmable Gate Arrays (FPGA), Application Specific Integrated Circuits (ASICs), etc.) including one or more processor cores or a System on Chip (SoC). For example, the processor 2100 may further include a cache memory located inside or outside.
The processor 2100 may process various operations to operate the electronic device 2000 . For example, a signal including information may be received from another electronic device or system external to the human body communication system 1000 . The receiver 1200 may output signals representing data corresponding to information. For example, the receiver 1200 including the receiver 1200_3 may output signals OUT31 and OUT32 representing data to the processor 2100 . The processor 2100 may process data obtained from the signals OUT31 and OUT32 to obtain information transmitted from the outside of the human body communication system 1000 .
The storage 2200 may store data regardless of power supply. For example, the storage 2200 may non-temporarily store data processed or to be processed by the processor 2100 . For example, the storage 2200 may non-temporarily store data obtained from the signals OUT31 and OUT32 and processed by the processor 2100 .
For example, the storage 2200 may include at least one of various nonvolatile memories such as flash memory, PRAM, MRAM, ReRAM, and FRAM. For example, the storage 2200 may include a removable memory such as a hard disk drive (HDD), a solid state drive (SSD), a secure digital (SD) card, and/or an embedded memory such as an embedded multimedia card (eMMC). may include
The memory 2300 may, for example, temporarily store data processed or to be processed by the processor 2100 . For example, the storage may temporarily store data obtained from the signals OUT31 and OUT32 and processed by the processor 2100 .
By way of example, the memory 2300 may include volatile memory, such as static random access memory (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), and/or flash memory, phase-change RAM (PRAM), magneto-memory (MRAM), etc. nonvolatile memory such as resistive RAM), resistive RAM (ReRAM), ferro-electric RAM (FRAM), and the like. Alternatively, the memory 2300 may include heterogeneous memories.
The user interface 2400 may mediate communication between a user of the electronic device 2000 and the electronic device 2000 . For example, the user may input a command to the electronic device 2000 through the user interface 2400 . Alternatively, the electronic device 2000 may provide information generated by the processor 2100 to the user through the user interface 2400 .
For example, the processor 2100 may process data obtained from the signals OUT31 and OUT32 to obtain information transmitted from the outside of the human body communication system 1000 . The processor 2100 may provide the user with information obtained based on the signals OUT31 and OUT32 through the user interface 2400 .
The security module 2500 may process or store data requiring a high security level. The security module 240 may operate in a security mode based on various security platforms. Accordingly, the security module 2500 may protect data requiring a high security level from external attacks. For example, when data obtained based on the signals OUT31 and OUT32 require a high security level, the data may be stored in the security module 2500 .
In this specification, a module means hardware capable of performing the operations described with reference to a specific component, or hardware (eg, a separate processor included in the security module 2500) to perform the operations. It may mean software that can be executed by a software or may mean a functional and/or structural combination of hardware or software for driving the hardware, but is not limited thereto.
The communication device 2600 may include various components for exchanging signals with another electronic device/system outside the electronic device 1000 . For example, the communication device 2600 may mediate communication between the electronic device 2000 and another electronic device or system outside the electronic device 2000 .
For example, the communication device 2600 may include a wired local area network (LAN), a wireless local area network (WLAN) such as Wi-Fi (Wireless Fidelity), and a wireless personal network such as Bluetooth (Bluetooth). (Wireless Personal Area Network; WPAN), Wireless USB (Wireless Universal Serial Bus), Zigbee, NFC (Near Field Communication), RFID (Radio-frequency identification), PLC (Power Line communication), or 3G (3rd Generation), 4G (4th Generation), LTE (Long Term Evolution), etc. may include a modem communication interface connectable to a mobile cellular network (mobile cellular network), and the like. The Bluetooth interface may support Bluetooth Low Energy (BLE).
Alternatively, the communication device 2600 may mediate communication performed using the human body as a medium. For example, the communication device 2600 may include the transmitter 1100 and the receiver 1200 of FIG. 1 configured to perform human body communication. The communication device 2600 may perform the operations described with reference to FIGS. 2 to 10 . Accordingly, the communication device 2600 may output signals including low noise and information obtained from the outside of the electronic device 2000 .
The power manager 2700 may supply power to components of the electronic device 2000 . For example, the power manager 2700 may appropriately convert power received from a battery and/or an external power source, and transmit the converted power to components of the electronic device 2000 .
The bus 2800 may provide a communication path between components of the electronic device 2000 . As an example, the processor 2100 , storage 2200 , memory 2300 , user interface 2400 , security module 2500 , communication device 2600 , and power manager 2700 connect to each other via bus 2800 . data (eg, data obtained from signals OUT31 and OUT32) may be exchanged. The bus 2800 may be configured to support various types of communication formats used in the electronic device 2000 .
The above are specific embodiments for carrying out the present invention. The present invention will include not only the above-described embodiments, but also simple design changes or easily changeable embodiments. In addition, the present invention will include techniques that can be easily modified and implemented using the embodiments. Therefore, the scope of the present invention should not be limited to the above-described embodiments, but should be defined by the claims described below as well as the claims and equivalents of the present invention.

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1000: human body communication system
1100: transmitter
1200: receiver
1200_1: Receiver
1200_2: Receiver
1200_3: Receiver

Claims (20)

delete delete delete delete delete delete delete delete delete a first electrode for receiving an input signal including a biosignal and a noise signal transmitted through the human body;
a second electrode for receiving a reference signal for amplification of the biosignal from the outside of the human body;
Among the reference frequency components of the reference signal received through a first node connected to the second electrode, first frequency components less than or equal to a first cut-off frequency pass to a second node, and the input received through the second node a first filter circuit configured to pass second frequency components of input frequency components of a signal below the first cutoff frequency to the first node;
a first capacitive element configured to attenuate frequency components less than or equal to a second cut-off frequency in third frequency components excluding the first frequency components of the reference frequency components, and the second frequency of the input frequency components a second filter circuit including a second capacitive element configured to attenuate frequency components below the second cutoff frequency in fourth frequency components excluding components; and
an amplifier configured to perform an amplification operation based on third frequency components excluding the first frequency components from among the reference frequency components, and fourth frequency components excluding the second frequency components from among the input frequency components; including,
The first cutoff frequency is greater than a frequency of the noise signal and less than a frequency of the biosignal;
The first filter circuit comprises an inductive element coupled between the first node and the second node,
The second filter circuit includes first and second resistors connected to a power supply terminal and configured to receive an operating voltage, a third resistor connected between the first resistor and a ground terminal through a third node, and the second resistor. and a fourth resistor connected between the ground terminal through a fourth node,
the first capacitive element is connected between the first node and the third node, the second capacitive element is connected between the second node and the fourth node,
The amplifier is connected to the third node through an inverting terminal to receive the reference signal including the third frequency components, and is connected to the fourth node through a non-inverting terminal to include the fourth frequency components The receiver is further configured to receive an input signal, amplify a difference between the level of the reference signal and the level of the input signal, and output the data of the biosignal. delete 11. The method of claim 10,
The second cut-off frequency is related to at least one of a demagnetization value of the first capacitive element or a demagnetization value of the second capacitive element. delete a first electrode for receiving an input signal including a biosignal and a noise signal transmitted through the human body;
a second electrode for receiving a reference signal for amplification of the biosignal;
A first noise having a frequency component less than or equal to a first cut-off frequency among the input signals received from the outside of the human body through a first node connected to the first electrode is passed to a second node, and the first noise connected to the second electrode is passed. a first filter circuit configured to receive the reference signal via a second node;
a second filter circuit configured to remove a second noise included in the input signal by passing the input signal from the first node to a third node, and pass the reference signal from the second node to a fourth node ; and
an amplifier configured to amplify the biosignal based on the biosignal included in the input signal received through the third node and the reference signal received through the fourth node,
the first cut-off frequency is greater than a frequency of the first noise and less than a frequency of the biosignal;
the first filter circuit comprises an inductive element coupled between the first node and the second node configured to pass the first noise;
The second filter circuit comprises:
a first capacitive element connected between the first node and the third node;
a second capacitive element connected between the second node and the fourth node;
a first resistor coupled between the third node and a power terminal configured to receive an operating voltage;
a second resistor connected between the fourth node and the power supply terminal and configured to receive the operating voltage;
a third resistor connected between the first resistor and a ground terminal through the third node; and
Further comprising a fourth resistor connected through a fourth node between the second resistor and the ground terminal,
The amplifier is connected to the third node through a non-inverting terminal to receive the bio-signal, and connected to the fourth node through an inverting terminal to receive the reference signal, the level of the bio-signal and the reference signal The receiver further configured to output the data of the biosignal by amplifying the level difference. delete 15. The method of claim 14,
wherein the demagnetization value of the inductive element is related to the frequency of the first noise.
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