Multi-mode multi-channel bio-electricity signal detection circuit

Abstract

The utility model discloses a multi-mode multi-channel bio-electricity signal detection circuit. The utility model relates to a multi-channel current detection circuit, which comprises a multi-channel amplification circuit module, a current control module and a control logic conversion module, and is characterized in that the multi-channel amplification circuit module is formed by an array consisting of a plurality of front-end acquisition modules; an operational amplifier in the multi-channel amplification circuit module is connected with the current control module and can control the tail current of the operational amplifier through different currents of the current control module; and the control logic conversion module is connected with the current control module through the switch array and can convert an input enable signal into an enable signal of the current control module of the corresponding channel. The system has the advantages that multiple different bio-electricity signals can be collected under the conditions of small area and power consumption, the energy efficiency of the system is effectively improved, the requirement for collecting the bio-electricity signals in the same system at the same time is met, manpower and time are greatly saved, the chip area and power consumption are reduced, and the cost is reduced. And the detection cost is reduced.

Description

Technical Field

[0001] This utility model relates to a bioelectric signal detection circuit, specifically a multi-mode, multi-channel bioelectric signal detection circuit. Background Technology

[0002] In the research and development of modern medicine and biology, the image characteristics of bioelectrical signals have become increasingly important. Commonly used human electrical signals in clinical practice include electrocardiogram (ECG), electroencephalogram (EEG), and electromyographic (EMG) signals. ECG signal acquisition is primarily used for ECG display, which plays a crucial role in the diagnosis and research of heart diseases. EEG signals are electrical signals generated by the activity of neurons in the brain; their acquisition is mainly used for EEG display, which can be used for the diagnosis and research of epilepsy and sleep disorders. EMG signals are mainly used to monitor human movement, especially the movement status of professional athletes, to develop appropriate exercise plans. Under normal circumstances, human bioelectrical signals such as ECG, EEG, and EMG signals are acquired using different instruments. Current acquisition and amplification methods are not only time-consuming and power-intensive, but also consume a significant amount of human resources. Summary of the Invention

[0003] The technical problem to be solved by this invention is a multi-mode, multi-functional bioelectric signal detection circuit that can simultaneously acquire different bioelectric signals, thereby effectively reducing acquisition time, acquisition power consumption, and manpower.

[0004] To address the aforementioned technical problems, this utility model provides a multi-mode, multi-functional bioelectric signal detection circuit, comprising a multi-channel amplifier module for amplifying different acquired bioelectric signals, a current control module consisting of a current source array and a switch array connected in series, and a control logic conversion module for converting an input enable signal into an enable signal for the current control module of the corresponding channel. The multi-channel amplifier module is composed of an array of multiple front-end acquisition modules. The operational amplifier in the multi-channel amplifier module is connected to the current control module and can control the tail current of the operational amplifier through different currents of the current control module. The control logic conversion module is connected to the current control module through the switch array and can convert the input enable signal into an enable signal for the current control module of the corresponding channel.

[0005] The control logic conversion module is used to control the power control signals T of different power supply channels. j The switch control signal S used to control the mode switch i And can be controlled by the switch signal S i The corresponding SK code is generated, and the SK code is then compared with the corresponding power control signal T. jBy performing the operation, the corresponding SW code can be obtained, thereby enabling control of the current in that channel.

[0006] The current port I of the operational amplifier in the multi-channel amplifier circuit module i It is connected to the current control module.

[0007] The enable signal is controlled by a gear switch that can be manually turned on.

[0008] The current control module has different range switches, and the different range switches of the current control module are connected to operational amplifiers in the front-end acquisition modules of different channels.

[0009] The advantages of this utility model are:

[0010] By using a detection circuit consisting of a multi-channel amplifier module, a current control module, and a control logic conversion module, the tail current of the operational amplifier can be controlled, thereby changing the transconductance g of the transistor. m Regarding noise, the larger the tail current of the operational amplifier provided by the current control module, the lower the transistor noise and the higher the power consumption; conversely, the smaller the tail current, the higher the transistor noise and the higher the power consumption. This detection circuit enables the acquisition of various bioelectrical signals with a smaller area and lower power consumption. It effectively improves the system's energy efficiency and meets the need for simultaneous acquisition of bioelectrical signals in the same system, thereby greatly saving manpower and time, reducing chip area and power consumption, and lowering detection costs. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the principle of the multi-mode, multi-functional bioelectric signal detection circuit of this utility model;

[0012] Figure 2 This is a simplified circuit diagram of the current control switch module in this utility model;

[0013] Figure 3 This is a circuit diagram of the control logic conversion module in this utility model;

[0014] Figure 4 This is a circuit diagram of the multi-channel amplifier circuit module in this utility model. Detailed Implementation

[0015] The multi-mode, multi-functional bioelectric signal detection circuit of this utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0016] As shown in the figure, this utility model's multi-mode, multi-functional bioelectrical signal detection circuit is mainly used for acquiring and amplifying different bioelectrical signals within the same system. It can acquire various bioelectrical signals, such as electrocardiogram (ECG), electroencephalogram (EEG), and electromyography (EMG). It mainly includes a multi-channel amplifier circuit module (AFE), a current control module with different levels, and a control logic conversion module. The multi-channel amplifier circuit module primarily consists of operational amplifiers. The function of the operational amplifiers is to acquire and amplify weak bioelectrical signals to achieve an observable amplitude value, facilitating subsequent transmission and processing. In other words, the multi-channel amplifier module is used for... Different bioelectric signals are collected to facilitate subsequent observation and diagnosis. The current control module controls the tail current of the operational amplifier to change the system noise, thereby extracting the characteristics of different bioelectric signals. Specifically, the current control module controls the tail current of the operational amplifier in the multi-channel amplification module to suppress noise to different degrees for different bioelectric signals. The logic control conversion module converts the manually opened gear switch (external enable signal) into the 01 signal corresponding to the channel's mode. In other words, it converts the external enable signal into the 01 signal controlling the current module, thereby controlling the switch of different gears and changing the acquisition mode of the channel.

[0017] Its specific circuit configuration is as follows:

[0018] As shown in the figure, the multi-channel amplification module consists of an array of multiple high-precision analog front-end acquisition modules. Its main function is to amplify different bioelectrical signals to varying degrees. The amplification level and its noise characteristics are controlled by the current control module and the control logic conversion module. The current control module has different level switches and is composed of a current source array and a switch array connected in series. The current source weights are I0 and 2I, respectively. 0、The 4I0 and 8I0 modules, with different current control operation amplifier tail currents, can alter the noise characteristics of the corresponding channels, thus forming acquisition modes for different bioelectrical signals. When the acquired bioelectrical signal has high requirements for channel noise levels, a larger current control is used to meet the low noise requirement; when the acquired bioelectrical signal has low requirements for channel noise levels, a smaller current control is used to reduce power consumption. The different level switches of the current control module are connected to the operational amplifiers in the amplifier circuit modules of different channels, and can control the tail current of the operational amplifiers through different currents of the current control module. The control logic conversion module is connected to the current control module via a switch array and can convert the input enable signal into the enable signal of the corresponding channel's current control module. This technical solution clearly defines the type of bioelectrical signal being acquired, provides different enable signals to the circuit, and through the conversion of the control logic conversion module, converts the enable signal into an 01 signal to control the current switch. By controlling the current switch, the tail current of the operational amplifier is changed, thus changing its g. m By eliminating noise, the modes of different channels are adjusted to the corresponding bioelectric signal acquisition modes, thereby realizing multi-channel and multi-mode acquisition.

[0019] Furthermore, the control logic conversion module converts the input enable signal, i.e., the digital signal representing a certain mode of a certain channel, into the enable signal of the current control module of the corresponding channel. This controls the opening and closing of the current source switch of that channel, ensuring that the noise or power consumption characteristics of that channel meet the requirements of the acquired signal. The control logic conversion module includes a power control signal T for controlling the power supply of different channels. j The switch control signal S used to control the mode switch i And can be controlled by the switch signal S i The corresponding SK code is generated, and the SK code is then compared with the corresponding power control signal T. j By performing the operation, the corresponding SW code can be obtained, thereby enabling control of the current in that channel.

[0020] Its working status is as follows:

[0021] First, identify the type of bioelectrical signal being measured to determine the external enabling signal. Assume the input S... i T j (i=1, 2, 3, 4, j=1, 2, 3, ..., n), both are 0 and 1 signals (1 represents VDD signal, 0 represents GND signal), where S i The value corresponds to the i-th type of biological signal ( Figure 3 The table shows S1 to S4 (referred to as Si for ease of description), where a value of 1 indicates that the switch for the i-th mode is on, and a value of 0 indicates that the corresponding switch is off. j This indicates the j-th channel ( Figure 3 The details of the current control module for channel 1 (T1, referred to as Tj in the text for ease of description) are given in the text. Its value of 1 indicates that the j-th channel is open, and 0 indicates that the corresponding channel is closed.

[0022] Figure 3 The system block diagram for the logic control module, T j It controls the power supply to different channels. When it is 1, the switch is closed, power is supplied to the j-th channel, and it starts working. When it is 0, the switch is open, power is disconnected to the j-th channel, and it cannot work. i Controls the mode switch, when S i When SK is 1, i Also equal to 1, when S i When it is 0, SK i It is also 0, which will generate the corresponding switch code SK code. To map it to different channels, the obtained SK code needs to be matched with the corresponding T... j The value is ANDed, that is, when the SK code is ANDed with the T code... j The output is 1 only when both values ​​are 1; if either value is 0, the output is 0. This yields the corresponding SW code, enabling control of the channel current and achieving multi-mode, multi-channel detection.

[0023] Let S be an example. i T j The 11 signal is converted into the control switch code of the corresponding channel's current control module through logic conversion, such as... Figure 2 As shown, for the sake of convenience, assume S i The signal noise requirement is at the third level. The logic conversion module will convert the switch code of the current control module of the j-th channel to 0010, that is, SW1=0, SW2=0, SW3=1, SW4=0. Except for switch SW3 which is closed and conducting, all other switches are in the open state, thereby ensuring that 4 I0 is the tail current value of the j-th channel.

[0024] Figure 4 This indicates a multi-channel high-precision amplifier circuit module, whose operational amplifier ( Figure 4 The triangle in the middle represents the current port I of the operational amplifier in that channel. i Connected to the current control module, as mentioned above, the tail current value of the j-th channel is 4I0, and the noise characteristics of its sampling channel match the noise of the measured bioelectric signal. By iterating the above process, the tail current value of each channel can be made to correspond to the external enable signal, thereby obtaining the noise characteristics that match the measured bioelectric signal, and thus realizing the function of measuring different bioelectric signals at the same time.

[0025] Of course, the above description is not intended to limit the present utility model, and the present utility model is not limited to the examples given above. Any changes, modifications, additions or substitutions made by those skilled in the art within the scope of the present utility model should also fall within the protection scope of the present utility model.

Claims

1. A multi-mode, multi-channel bioelectrical signal detection circuit, characterized in that: The system includes a multi-channel amplifier circuit module for amplifying different acquired bioelectrical signals, a current control module consisting of a current source array and a switch array connected in series, and a control logic conversion module for converting an input enable signal into an enable signal for the current control module of the corresponding channel. The multi-channel amplifier circuit module is composed of an array of multiple front-end acquisition modules. The operational amplifier in the multi-channel amplifier circuit module is connected to the current control module and can control the tail current of the operational amplifier through different currents of the current control module. The control logic conversion module is connected to the current control module through the switch array and can convert the input enable signal into an enable signal for the current control module of the corresponding channel.

2. The multi-mode, multi-channel bioelectrical signal detection circuit according to claim 1, characterized in that: The control logic conversion module includes power control signals T for controlling different channel power supplies. j The switch control signal S used to control the mode switch i And can be controlled by the switch signal S i The corresponding SK code is generated, and the SK code is then compared with the corresponding power control signal T. j By performing the operation, the corresponding SW code can be obtained, thereby enabling control of the current in that channel.

3. The multi-mode, multi-channel bioelectrical signal detection circuit according to claim 1 or 2, characterized in that: The current port I of the operational amplifier in the multi-channel amplifier circuit module i It is connected to the current control module.

4. The multi-mode, multi-channel bioelectrical signal detection circuit according to claim 3, characterized in that: The enable signal is controlled by a gear switch that can be manually turned on.

5. The multi-mode, multi-channel bioelectrical signal detection circuit according to claim 1, 2, or 4, characterized in that: The current control module has different range switches, and the different range switches of the current control module are connected to operational amplifiers in the front-end acquisition modules of different channels.

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