KR20200098364A - 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. According to the present invention, the first filter circuit provides a first path for first frequency components less than or equal to a first cutoff frequency among input frequency components, and passes second frequency components other than the first frequency components among the input frequency components through a second path. The second filter circuit attenuates third frequency components less than or equal to a 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{RECEIVER FOR REMOVING NOISE GENERATED IN HUMAN BODY COMMUNICATION}

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

As information technology develops, communication technology between electronic devices is also developing. 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 to support various protocols.

As interest in ubiquitous technology and bio industry increases, human body communication technology that transmits signals through the human body is drawing attention. Human body communication technology has been 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 in the process of transmitting a signal through the human body. In order to efficiently receive signals transmitted through the human body, a high-performance receiver is required. As an example, there is a need for a receiver configured to remove noise generated in a process transmitted through a human body.

The present invention can provide a receiver configured to remove 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 less than or equal to the first cutoff frequency among the input frequency components, and passes the second frequency components excluding the first frequency components among the input frequency components through a second path. Can pass through. The second filter circuit may attenuate third frequency components below the second cutoff frequency among the second frequency components. The amplifier may amplify 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. First frequency components less than or equal to the first cutoff frequency among the reference frequency components received through the first node are passed to the second node, and a second frequency component less than or equal to the first cutoff frequency among the input frequency components received through the second node Frequency components can 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 an input signal received through the first node may pass through to the second node, and a reference signal may be received through the second node. The amplifier may amplify a difference between the level of the biosignal included in the input signal and the level of the reference signal to output biosignal data. 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 through human body communication is accurately received.

1 is a block diagram showing 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 are graphs showing signals received by the receiver of FIG. 1.
4 is a conceptual diagram showing an exemplary configuration of the receiver of FIG. 1.
5 is a circuit diagram showing an exemplary configuration of the receiver of FIG. 4.
6 is a graph for explaining operations of the filter circuit of FIG. 4.
7 is a conceptual diagram showing an exemplary configuration of the receiver of FIG. 1 according to an embodiment of the present invention.
8 is a circuit diagram showing an exemplary configuration of the receiver of FIG. 7.
9 is a graph for explaining operations of the filter circuit of FIG. 7.
10 are graphs for explaining operations of the receiver of FIG. 7.
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, detailed details such as detailed configurations and structures are provided simply to help overall understanding of embodiments of the present invention. Therefore, modifications of the embodiments described in the text may be performed by a person 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 clarity and conciseness. Terms used in the present specification are terms defined in consideration of functions of the present invention, and are not limited to specific functions. The definition of terms may be determined based on the matters described in the detailed description.

Circuits in the following drawings or in the detailed description may be connected to other things in addition to the elements shown in the drawings or described in the detailed description. The connections between circuits or components may be direct or non-direct, respectively. The 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 in the text 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 a meaning equivalent to a contextual meaning in a related technical field, and are not interpreted to have an ideal or excessively formal meaning unless clearly defined in the text.

1 is a block diagram showing 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 the human body 10. In this specification, exemplary configurations and operations of the human body communication system 1000 that communicates through the human body 10 will be described, but it will be understood that the human body communication system 1000 can communicate through various media. For example, the medium of the human body communication system 1000 may be changed and modified into various living organisms 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 (see FIG. 11 ). As an 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, processor, memory, 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, a biosignal) including various information through the human body 10. For example, the biosignal may include information for operation of an electronic device including the human body communication system 1000. The transmission device 100 may be in contact with the human body 10 or may be spaced apart from the epidermis of the human body 10 at small intervals to transmit a biosignal. For example, the transmitter 1100 may support various types of protocols for transmitting a bio-signal 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 data of the bio-signal may be related to various pieces 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 an 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 a biosignal transmitted through the human body 10. For example, the receiver 1200 may support various types of protocols for receiving bio signals through the human body 10. The receiver 1200 may acquire data of the received bio-signal. The receiver 1200 may acquire information included in the biosignal (ie, information obtained from outside 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 bio-signal from the outside of the human body communication system 1000. For example, the receiver 1200 may receive a reference signal from an external ground of the human body communication system 1000 or 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) outside the human body 10 may be absorbed by the human body 10. Noise signals may be generated inside the human body by the absorbed energy. The receiver 1200 may receive a noise signal generated by the human body 10.

The receiver 1200 may perform an amplification operation based on a signal, a reference signal, and a noise signal received from the transmitter 1100 in order to accurately obtain data of a biosignal. That is, the receiver 1200 may perform an amplification operation to accurately acquire data of a weakened bio-signal during a 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 obtain data of the biosignal. 2 to 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, the 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 bio-signal INS are received through the electrode EN2, the receiver 1200_1 is an input signal including the bio-signal 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 a sum of the level of the living body INS and the level of the noise signal NS. With reference to FIG. 3, a bio signal INS, a noise signal NS, and an input signal IN will be described in more detail.

The amplifier 1210 may receive a reference signal INR through an inverting terminal and may receive an input signal IN through a non-inverting terminal. The amplifier 1210 may output signals OUT11 and OUT12 based on the reference signal INR and the input signal IN. For example, the amplifier 1210 may output 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 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 the signals OUT11 and OUT12 may be complementary. Accordingly, the sum of the levels of the signals OUT11 and OUT12 may be uniform. However, uniformity in the present specification means that a specific value does not change over 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 signals OUT11 and OUT12 as components thereof in order to transmit the data of the biometric signal INS to other components of the electronic device. .

3 are graphs showing signals received by the receiver of FIG. 1.

As described with reference to FIGS. 1 and 2, the receiver 1200 receives a bio-signal (INS) received through the human body 10 from the transmitter 1100 and a noise signal NS including noise. I 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 F2.

As the noise signal NS and the bio signal INS are received through the electrode EN2, an input signal IN may be generated. The input signal IN may include a noise signal NS and a bio signal INS. Accordingly, the input signal IN may include noise. For example, the input signal IN may include noise of a frequency F1.

4 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_2 of FIG. 4. Referring to FIG. 4, the 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 respectively similar to those described with reference to FIG. 2, and thus redundant descriptions are omitted. 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 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, but the ground voltage may be changed and modified to voltages of various levels for normal operation of the amplifier 1210. Will make sense.

The filter circuit 1220 may output 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 below the cutoff frequency among frequency components of the input signal IN and the reference signal INR. As an 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 below the cutoff frequency among the frequency components of the reference signal INR, and output a 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 the 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 signals OUT21 and OUT22 based on the signals INN1 and INP1. For example, the amplifier 1210 may output signals OUT21 and OUT22 having levels obtained by multiplying the 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. Referring 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. 4.

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, 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 of 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 cutoff frequency may be determined based on the device value of the capacitive element C1. For a frequency band less than or equal to the first cutoff frequency, the levels of the frequency components included in the signal INN1 may be lower than the levels of the 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. A signal INP1 including 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 device value of the capacitive element C2. For a frequency band less than or equal to the second cutoff frequency, the levels of the frequency components included in the signal INP1 may be lower than the levels of the frequency components included in the input signal IN.

The signals INP1 and INN1 may be used as differential inputs of the amplifier 1210. Accordingly, the filter circuit 1220 may be designed to output signals INP1 and INN1 corresponding to each other to the amplifier 1210. For example, element values of the capacitive elements C1 and C2 may be set so that a first cutoff frequency associated with the capacitive element C1 corresponds to a second cutoff frequency associated with the capacitive element C2. have.

Hereinafter, for convenience of description, an embodiment in which the first cutoff frequency and the second cutoff frequency are the same will be described. Hereinafter, both the first cutoff frequency and the second cutoff frequency are referred to as a cutoff frequency of the filter circuit 1220. However, it will be appreciated 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.

6 is a graph for explaining operations of the filter circuit of FIG. 4. In the example of FIG. 6, the x-axis represents the frequency, and the y-axis represents 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 cutoff 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. The level of noise included in the signal INP1 may be lower than the level of noise included in the input signal IN.

The amplifier 1210 may output signals OUT21 and OUT22 based on a signal INP1 including a small amount of noise. Levels of noises included in the signals OUT21 and OUT22 may be lower than levels of noises included in the signals OUT11 and OUT12 of FIG. 2. Components of an electronic device including the human body communication system 1000 may operate based on signals OUT21 and OUT22 including only a small level of noise.

7 is a conceptual diagram showing 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, the 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 respectively similar to those described with reference to FIG. 2, and thus redundant descriptions are omitted. Exemplary configurations and operations of the filter circuit 1220 are similar to those described with reference to FIG. 4, and thus redundant descriptions are 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 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. As an example, the filter circuit 1230 separates frequency components below the cutoff frequency among the frequency components of the reference signal INR and frequency components below the cutoff frequency among the frequency components of the input signal IN. A path (a path other than the path to the amplification circuit 1220) can 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 cutoff 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 included in) may be attenuated. That is, the 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 pass the signals INN21 and INP21 to output signals INN22 and INP22. The amplifier 1210 may output signals OUT31 and OUT32 based on the signals INN22 and INP22. For example, the amplifier 1210 may output signals OUT31 and OUT32 having levels obtained by multiplying the 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.

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. It may include at least one of various combinations of elements, and inductive elements connected in parallel and inductive elements connected in series.

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 similar to those described with reference to FIG. 5, and thus redundant descriptions are omitted below.

The inductive element L may receive the reference signal INR through the node N3. The inductive element L may pass some of the frequency components of the reference signal INR. For example, the cutoff frequency may be determined based on the device value of the inductive element L. The inductive element L may provide a path to frequency components having a frequency lower than the 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 amplifying circuit 1220. Accordingly, for a frequency band below the cutoff frequency, the levels of the frequency components included in the signal INN21 may be lower than the levels of the 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 to frequency components having a frequency lower than the 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 amplifying circuit 1220. Accordingly, for a frequency band below the cutoff frequency, the levels of the frequency components included in the signal INP21 may be lower than the levels of the frequency components included in the input signal IN. Signals INN22 and INP22 to be provided as differential inputs of the amplifier 1210 may be generated based on the signals INN21 and INP21.

9 is a graph for explaining operations of the filter circuit of FIG. 7. In the example of FIG. 9, the x-axis represents the frequency, and the y-axis represents 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. 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 to 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 containing little noise, the amplifier 1210 may output signals OUT31 and OUT32 based on the signal INP22 containing little noise. . The levels of noises included in the signals OUT21 and OUT22 may be smaller than the levels of noises included in the signals OUT11 and OUT12 of FIG. 2 and the signals OUT21 and OUT22 of FIG. 4. Components of an electronic device including the human body communication system 1000 may operate based on signals OUT31 and OUT32 including only a small amount of noise. Accordingly, the components of the electronic device can accurately obtain data of the signals OUT31 and OUT32.

10 are graphs for explaining operations of the receiver of FIG. 7.

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 comparing the signal INP22 and 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. In addition, when comparing the signal INN22 and the reference signal INR, the level of the low frequency component included in the signal INM22 may be lower 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 the difference between the levels of the signals INP22 and INN22 by the gain of the amplifier 1210. Accordingly, the size of the signal OUT31 may be larger than the size 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.

The electronic device 2000 includes a processor 2100, a memory 2200, a storage 2300, a user interface 2400, a security module 2500, a communication device 2600, a power manager 2700, and a bus 2800. It 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.

As an example, the processor 2100 includes one processor core (Single Core), or a plurality of processor cores (Multi-Core) (eg, dual-core (Dual-Core), quad-core (Quad-Core), hexa core) It may include a multi-core such as (Hexa-Core)). As an example, the processor 2100 may include a dedicated circuit including one or more processor cores (eg, Field Programmable Gate Arrays (FPGA), Application Specific Integrated Circuits (ASICs), etc.) 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 outside 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 acquired 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). Can include.

For example, the memory 2300 may temporarily store data processed or to be processed by the processor 2100. As an example, the storage may temporarily store data obtained from the signals OUT31 and OUT32 and processed by the processor 2100.

For example, the memory 2300 is a volatile memory such as SRAM (Static Random Access Memory), DRAM (Dynamic RAM), SDRAM (Synchronous DRAM), and/or flash memory, PRAM (Phase-change RAM), MRAM (Magneto- Resistive RAM), resistive RAM (ReRAM), ferro-electric RAM (FRAM), etc. may be included. 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 a user through the user interface 2400.

For example, the processor 2100 may process data acquired 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 acquired 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 acquired based on the signals OUT31 and OUT32 requires 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 in hardware (eg, a separate processor included in the security module 2500) to perform the operations. It may refer to software that can be executed by or may refer to a functional and/or structural combination of hardware or software for driving hardware, but is not limited thereto.

The communication device 2600 may include various components for exchanging signals with other electronic devices/systems 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.

As an example, the communication device 2600 is a wired local area network (LAN), a wireless local area network (WLAN) such as Wi-fi (Wireless Fidelity), and a wireless personal communication network such as 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), and the like may include a modem communication interface accessible to a mobile cellular network. The Bluetooth interface may support Bluetooth Low Energy (BLE).

Alternatively, the communication device 2600 may mediate communication performed by the human body as a medium. As an example, the communication device 2600 may include the transmitter 1100 and 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 little noise and information obtained from the outside of the electronic device 2000.

The power manager 2700 may supply power to the 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 transfer the converted power to the 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, the storage 2200, the memory 2300, the user interface 2400, the security module 2500, the communication device 2600, and the power manager 2700 are connected to each other through the bus 2800. Data (eg, data obtained from signals OUT31 and OUT32) can be exchanged. The bus 2800 may be configured to support various types of communication formats used in the electronic device 2000.

The above-described contents are specific examples for carrying out the present invention. The present invention will include not only the above-described embodiments, but also embodiments that can be simply changed or easily changed. In addition, the present invention will also include techniques that can be easily modified and implemented using the embodiments. Therefore, the scope of the present invention is limited to the above-described embodiments and should not be defined, and should be determined by the claims and equivalents of the present invention as well as the claims to be described later.

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

Claims (20)

Provides a first path to the first frequency components to remove first frequency components below the first cutoff frequency among the input frequency components, and a second frequency excluding the first frequency components among the input frequency components A first filter circuit configured to pass components through a second path;
A second filter circuit configured to attenuate third frequency components less than a second cutoff frequency among the second frequency components passed through the second path; And
A receiver comprising an amplifier configured to amplify the second frequency components including the attenuated third frequency components. The method of claim 1,
The first filter circuit includes an inductive element configured to provide the first path. The method of claim 2,
The first cutoff frequency is related to the element value of the inductive element. The method of claim 1,
The input frequency components include noise,
The first cutoff frequency is related to the frequency of the noise. The method of claim 4,
The first cutoff frequency is higher than the frequency of the noise receiver. The method of claim 1,
The second filter circuit comprises a capacitive element configured to attenuate the third frequency components. The method of claim 6,
The second cutoff frequency is related to the element value of the capacitive element. The method of claim 1,
The second cutoff frequency is higher than the frequency of noise included in the input frequency components. The method of claim 1,
The second filter circuit is further configured to receive an operating voltage for operation of the amplifier. The first frequency components less than or equal to the first cutoff frequency among the reference frequency components received through the first node are passed to the second node, and among the input frequency components received through the second node, less than or equal to the first cutoff frequency. A first filter circuit configured to pass second frequency components to the first node; And
An amplifier configured to 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. Containing receiver. The method of claim 10,
A first capacitive element configured to attenuate fifth frequency components below the second cutoff frequency among the third frequency components, and attenuate sixth frequency components below the second cutoff frequency among the fourth frequency components The receiver further comprising a second filter circuit comprising a second capacitive element that is configured to allow. The method of claim 11,
The second cut-off frequency is related to at least one of a device value of the first capacitive device or a device value of the second capacitive device. The method of claim 11,
The amplifier further amplifies the amplification based on a difference between levels of the third frequency components including the attenuated fifth frequency components and the levels of the fourth frequency components including the attenuated sixth frequency components. Receiver configured to perform an action. A first filter circuit configured to pass a first noise included in an input signal received through a first node to a second node and receive a reference signal through the second node;
A second filter circuit configured to remove second noise included in the input signal by passing the input signal from the first node to a third node, and to 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 frequency of the noise is lower than the frequency of the biological signal receiver. The method of claim 14,
The first filter circuit includes an inductive element configured to pass the noise. The method of claim 15,
The device value of the inductive element is related to the frequency of the noise. The method of claim 14,
The second filter circuit includes a first capacitive element between the first node and the third node, and a second capacitive element between the second node and the fourth node. The method of claim 14,
The second filter circuit includes a resistor configured to receive an operating voltage for operation of the amplifier. The method of claim 14,
The second filter circuit includes a resistor configured to receive a ground voltage for operation of the amplifier. The method of claim 14,
The amplifier is further configured to amplify a difference between the level of the bio-signal received through the third node and the level of the reference signal through the fourth node to output data of the bio-signal.

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