Signal acquisition circuit, signal acquisition method and sensor system
By introducing low on-resistance switches and signal processing units into the signal acquisition circuit, the problems of sensor signal attenuation and high circuit cost are solved, achieving efficient signal acquisition and reducing circuit complexity.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- BEIJING ZENITHNANO TECH CO LTD
- Filing Date
- 2026-01-05
- Publication Date
- 2026-04-17
AI Technical Summary
In the prior art, when acquiring sensor unit signals by row and column scanning, the high on-resistance of the CMOS analog switch causes the sensor signal to attenuate, and the unselected sensor units form parasitic paths, affecting data accuracy. At the same time, equipping each sensor unit with a dedicated signal conditioning circuit leads to a sharp increase in the size, power consumption and cost of the signal acquisition circuit.
The combination of a drive module and a signal acquisition module, including a first gating unit and a second gating unit, is adopted. The sensor signal is selected and buffered by a switch with low on-resistance, and converted into a digital signal by a signal processing unit, thereby reducing signal attenuation and reducing circuit size and power consumption.
It effectively reduces signal attenuation, ensures sensor signal quality, reduces the size and cost of signal acquisition circuits, improves measurement accuracy and system sensitivity, and reduces crosstalk effects.
Smart Images
Figure CN121887192A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of signal acquisition technology, and in particular to a signal acquisition circuit, a signal acquisition method, and a sensor system. Background Technology
[0002] In fields such as tactile sensing, electronic skin, and flexible pressure detection, large-scale sensor arrays are often used to obtain information on the distribution of physical quantities such as pressure and stress.
[0003] A sensor array (M rows and N columns) comprises a large number of sensor units. In order to address each sensor unit through a limited number of interface pins, existing technologies use a row-column scanning method to acquire signals from each sensor unit. Specifically, the row-column scanning method uses M+N signal lines to activate rows and columns sequentially or in order to read sensor signals by "time-division multiplexing" the wires of rows and columns.
[0004] However, when acquiring sensor unit signals using row and column scanning, commonly used CMOS analog switches have high on-resistance. This on-resistance forms a voltage divider with the sensor unit's resistance, causing a significant attenuation of the weak sensor signal and consequently reducing the signal quality. While equipping each sensor unit with a dedicated signal conditioning circuit (such as an operational amplifier) could solve the signal attenuation problem, it would drastically increase the size, power consumption, and cost of the signal acquisition circuit. Summary of the Invention
[0005] This invention provides a signal acquisition circuit to reduce signal attenuation during sensor signal acquisition, ensure the quality of sensor signals, and reduce the size, power consumption, and cost of the signal acquisition circuit. The signal acquisition circuit includes: The drive module is connected to multiple drive lines of the sensor array and is used to selectively drive one of the multiple drive lines in response to the drive control signal. The signal acquisition module includes a first gating unit, a second gating unit, and a signal processing unit; the first gating unit includes multiple switches; the second gating unit includes multiple input terminals and one output terminal; the first terminal of each switch is connected to a data line of the sensor array, and the second terminal is connected to an input terminal of the second gating unit; the output terminal of the second gating unit is connected to the signal processing unit. The first gating unit is used to respond to the first gating signal to turn on one of the multiple switches, so as to transmit the sensor signal on the data line connected to the first terminal of the turned switch to the second gating unit; wherein the on-resistance of each switch is less than a preset on-resistance threshold. The second gating unit is used to connect the target input terminal of the second gating unit with the output terminal of the second gating unit in response to the second gating signal, so as to output the sensor signal output by the first gating unit to the signal processing unit; the target input terminal is the input terminal of the second gating unit connected to the second terminal of the on switch; The signal processing unit is used to convert sensor signals into digital signals.
[0006] Optionally, the drive line is a row line of the sensor array and the data line is a column line of the sensor array; or the drive line is a column line of the sensor array and the data line is a row line of the sensor array.
[0007] Optionally, the drive module includes multiple cascaded first multiplexers; The first multiplexer includes: The control terminal is used to receive the third strobe signal in the drive control signal; The input terminal is used to receive the drive voltage signal from the drive control signal; Multiple output terminals are connected to each drive line of the sensor array, respectively; The first multiplexer is used to establish a connection between the input terminal of the first multiplexer and the selected output terminal according to the third strobe signal, so as to transmit the drive voltage signal to the drive line connected to the selected output terminal.
[0008] Optionally, the on-resistance threshold is 5 ohms.
[0009] Optionally, the input impedance of the switch is greater than a preset first impedance threshold; the output impedance of the switch is less than a preset second impedance threshold.
[0010] Optionally, the first impedance threshold is 100 megohms and the second impedance threshold is 1 ohm.
[0011] Optionally, the switch is a single-pole single-throw analog switch.
[0012] Optionally, the second gating unit includes a plurality of cascaded second multiplexers; The second multiplexer includes: The control terminal is used to receive the second strobe signal; Multiple input terminals are respectively connected to the second terminal of each switch in the first gating unit; The output terminal is connected to the signal processing unit. The second multiplexer is used to establish a connection between the input and output terminals of the selected target according to the second gating signal, so as to output the sensor signal output by the first gating unit to the signal processing unit.
[0013] This invention also provides a signal acquisition method to reduce signal attenuation during sensor signal acquisition, ensure the quality of sensor signals, and reduce the size, power consumption, and cost of the signal acquisition circuit. This method is applied to the aforementioned signal acquisition circuit and includes: By controlling the drive module, one of the multiple drive lines of the sensor array can be selectively driven; By controlling the first gating unit of the signal acquisition module, one of the multiple switches in the first gating unit is turned on, so as to transmit the sensor signal on the data line connected to the first terminal of the turned-on switch to the second gating unit; wherein, the on-resistance of each switch is less than a preset on-resistance threshold. By controlling the second gating unit of the signal acquisition module, a connection is established between the target input terminal and the output terminal of the second gating unit, so as to output the sensor signal output by the first gating unit to the signal processing unit; the target input terminal is the input terminal of the second gating unit connected to the second terminal of the on switch; The sensor signal is converted into a digital signal by the signal processing unit.
[0014] This invention also provides a sensor system, including a sensor array and the signal acquisition circuit described above.
[0015] The signal acquisition circuit of this embodiment includes: a driving module, connected to multiple driving lines of a sensor array, for selectively driving one of the multiple driving lines in response to a driving control signal; the signal acquisition module includes a first gating unit, a second gating unit, and a signal processing unit; the first gating unit includes multiple switches; the second gating unit includes multiple input terminals and an output terminal; the first terminal of each switch is connected to a data line of the sensor array, and the second terminal is connected to an input terminal of the second gating unit; the output terminal of the second gating unit is connected to the signal processing unit; the first gating unit is used to respond to... In response to a first gating signal, one of a plurality of switches is turned on to transmit the sensor signal on the data line connected to the first terminal of the turned-on switch to the second gating unit; wherein, the on-resistance of each switch is less than a preset on-resistance threshold; the second gating unit is used to establish a connection between the target input terminal and the output terminal of the second gating unit in response to the second gating signal, so as to output the sensor signal output by the first gating unit to the signal processing unit; the target input terminal is the input terminal of the second gating unit connected to the second terminal of the turned-on switch; the signal processing unit is used to convert the sensor signal into a digital signal. Thus, in the signal acquisition circuit of this embodiment, since the on-resistance of the switch of the first gating unit of the signal acquisition module is less than the preset on-resistance threshold, the sensor signal on each data line is selected and buffered by the first gating unit, which can effectively reduce signal attenuation and ensure the quality of the sensor signal; then, the sensor signal output by the first gating unit is selected and collected by the second gating unit, and the sensor signal output by the signal processing unit is processed, which can reduce the scale, power consumption and cost of the signal acquisition circuit. Attached Figure Description
[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0017] In the attached diagram: Figure 1 A structural diagram of a sensor system provided in an embodiment of the present invention; Figure 2 A schematic diagram of a driving module provided in an embodiment of the present invention; Figure 3 A schematic diagram of a signal acquisition module provided in an embodiment of the present invention; Figure 4 This is a structural diagram of another sensor system provided in an embodiment of the present invention; Figure 5 This is a flowchart of a signal acquisition method provided in an embodiment of the present invention. Detailed Implementation
[0018] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. Here, the illustrative embodiments of the present invention and their descriptions are used to explain the present invention, but are not intended to limit the present invention.
[0019] In the description of this specification, the terms "comprising," "including," "having," and "containing" are open-ended terms, meaning that they include but are not limited to. The terms "an embodiment," "a specific embodiment," "some embodiments," and "for example," etc., refer to specific features, structures, or characteristics described in connection with that embodiment or example that are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, or characteristics described can be combined in any suitable manner in one or more embodiments or examples. The order of steps involved in the various embodiments is used to illustrate the implementation of this application, and the order of steps is not limited and can be adjusted appropriately as needed.
[0020] In the description of this specification, the terms "first" and "second," etc., are used to distinguish different objects or to distinguish different treatments of the same object, rather than to describe a specific order of objects.
[0021] In the description of this specification, "and / or" is merely a way of describing the relationship between related objects, indicating that there can be three relationships. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone.
[0022] Research has revealed that when acquiring sensor unit signals using the row and column scanning method, the CMOS analog switches commonly used in the signal acquisition circuit have high on-resistance. This on-resistance forms a voltage divider with the resistance of the sensor unit, causing a significant attenuation of the weak sensor signal and thus reducing the quality of the sensor signal. Furthermore, unselected sensor units in the sensor array can form parasitic paths, generating crosstalk currents and affecting the accuracy of the acquired sensor unit data.
[0023] Based on the above problems, equipping each sensing unit with a dedicated signal conditioning circuit (such as an operational amplifier) can solve some of the problems, but it will lead to a sharp increase in the size, power consumption and cost of the signal acquisition circuit, making it unsuitable for large-scale arrays.
[0024] Based on this, embodiments of the present invention provide a signal acquisition circuit that can effectively reduce the attenuation of sensor signals caused by the on-resistance of analog switches, ensure the quality of sensor signals, and reduce the size, power consumption and cost of the signal acquisition circuit.
[0025] This invention provides a sensor system. Figure 1 This is a structural diagram of a sensor system provided in an embodiment of the present invention. The sensor system includes a sensor array and a signal acquisition circuit. The signal acquisition circuit can be used to acquire the signal of each sensor unit in the sensor array of the above-mentioned sensor system. The sensor array is an M-row × N-column sensor array. Each column of sensors is connected through a column signal line, and each row of sensors is connected through a row signal line. The drive line can be a row line (row signal line) of the sensor array, and the data line can be a column line (column signal line) of the sensor array; or the drive line can also be a column line (column signal line) of the sensor array, and the data line can also be a row line (row signal line) of the sensor array.
[0026] like Figure 1 As shown, the signal acquisition circuit may include: The drive module is connected to multiple drive lines of the sensor array and is used to selectively drive one of the multiple drive lines in response to the drive control signal. The signal acquisition module includes a first gating unit, a second gating unit, and a signal processing unit; the first gating unit includes multiple switches; the second gating unit includes multiple input terminals and one output terminal; the first terminal of each switch is connected to a data line of the sensor array, and the second terminal is connected to an input terminal of the second gating unit; the output terminal of the second gating unit is connected to the signal processing unit. The first gating unit is used to respond to the first gating signal to turn on one of the multiple switches, so as to transmit the sensor signal on the data line connected to the first terminal of the turned switch to the second gating unit; wherein the on-resistance of each switch is less than a preset on-resistance threshold. The second gating unit is used to connect the target input terminal of the second gating unit with the output terminal of the second gating unit in response to the second gating signal, so as to output the sensor signal output by the first gating unit to the signal processing unit; the target input terminal is the input terminal of the second gating unit connected to the second terminal of the on switch; The signal processing unit is used to convert sensor signals into digital signals.
[0027] Thus, in the signal acquisition circuit of this embodiment of the invention, since the on-resistance of the switch of the first gating unit of the signal acquisition module is less than the preset on-resistance threshold, the sensor signal on each data line can be selected and buffered by the first gating unit, which can effectively reduce signal attenuation and ensure the quality of the sensor signal. Then, the sensor signal output by the first gating unit is selected and collected by the second gating unit, and the sensor signal output by the signal processing unit is processed, which can reduce the scale, power consumption and cost of the signal acquisition circuit.
[0028] In one embodiment, the signal acquisition circuit may further include a control module, which is used to output a drive control signal, a first strobe signal, and a second strobe signal.
[0029] The control module can be implemented using a microcontroller unit (MCU).
[0030] In one embodiment, the drive module may include multiple cascaded first multiplexers. The drive control signal may include a third strobe signal and a drive voltage signal.
[0031] Each first multiplexer may include: The control terminal is connected to the control module and is used to receive the third strobe signal output by the control module. The input terminal is connected to the control module and is used to receive the drive voltage signal output by the control module. Multiple output terminals are connected to each drive line of the sensor array, respectively; The first multiplexer is used to establish a connection between the input terminal of the first multiplexer and the selected output terminal according to the third strobe signal, so as to transmit the drive voltage signal to the drive line connected to the selected output terminal.
[0032] In practice, the first multiplexer can sequentially turn on the transmission path between the input terminal and each output terminal according to the third strobe signal, and apply the drive voltage signal to the drive line connected to the selected output terminal through the transmission path, thereby driving the sensor unit on each drive line.
[0033] Figure 2 This is a structural diagram of the driver module provided in an embodiment of the present invention. Figure 2 As shown, taking N=24 drive lines and an 8-to-1 switch as the first multiplexer (i.e., the first multiplexer includes one input and eight outputs) as an example, the drive module requires k1=3 (k1=N / 8) first multiplexers cascaded together.
[0034] Figure 2In this configuration, the control terminals A, B, and C of each first multiplexer are connected to the digital I / O ports (IO1-IO3) of the control module; the input terminals COMOUT / IN are connected to the control module; and the eight output terminals 0, 1, 2, 3, 4, 5, 6, and 7 are each connected to a drive line (column). Therefore, the three first multiplexers have a total of 24 output terminals, which are connected to 24 column lines, i.e., column1-column24.
[0035] Specifically, the cascading method can employ parallel address control, with the control module providing an address signal (third strobe signal) and an enable signal (drive voltage signal). The address signal can be an S-bit binary signal, corresponding to the index number of the drive line. The control terminals (such as A, B, and C) receive the binary signal, and based on this binary signal, the index number of the selected drive line can be determined, thereby determining the output terminal connected to that drive line. Therefore, the number of ports on the control terminal can be set according to the number of drive lines.
[0036] In this way, each column line is driven sequentially by the third strobe signal, while the undriven column lines remain in high configuration, avoiding parasitic paths. This ensures the sequentiality and reliability of the driving lines, while also reducing power consumption.
[0037] It should be noted that the first multiplexer can also be other multiple-to-1 switches, such as a 4-to-1 switch, a 24-to-1 switch, etc. There is no specific limitation here. However, the first multiplexer has only one input and multiple outputs.
[0038] In this embodiment of the invention, the signal acquisition module may include a first gating unit, a second gating unit, and a signal processing unit. The first gating unit is used to select and buffer sensor signals, and the second gating unit is used to select and aggregate sensor signals.
[0039] The first gating unit may include multiple switches; the first end of each switch is connected to a data line of the sensor array, and the second end is connected to an input terminal of the second gating unit. In this way, the first gating unit turns on one of the multiple switches based on the first gating signal, and then transmits the sensor signal on the data line connected to the first end of the turned switch to the second gating unit, thereby realizing the first selection of the sensor signal.
[0040] Furthermore, the on-resistance of each switch is less than a preset on-resistance threshold, meaning that the on-resistance of each switch is extremely low. In one embodiment, the on-resistance threshold can be set to 5 ohms, and more preferably, it can be set to 1 ohm, thereby ensuring that the on-resistance of each switch is significantly lower than that of the second selection unit. This allows for buffering of the sensor signal, reducing sensor signal attenuation and distortion, and providing more accurate transmission.
[0041] In one embodiment, the input impedance of each switch is greater than a preset first impedance threshold; the output impedance of each switch is less than a preset second impedance threshold.
[0042] The first impedance threshold can be set to 100 megohms, and the second impedance threshold can be set to 1 ohm.
[0043] In other words, each switch also has high input impedance (>100MΩ) and low output impedance (<1Ω). In this way, when the switch is turned on, its high input impedance ensures that it will not cause a significant loading effect on the sensor unit (resistance range is usually 1kΩ-100kΩ) on the data line; the low output impedance can improve the driving capability of the sensor signal, thereby ensuring the integrity of the sensor signal and reducing signal attenuation.
[0044] Furthermore, in this embodiment of the invention, when one of the multiple switches is turned on, the data lines connected to the other switches are isolated, which can suppress crosstalk.
[0045] In this embodiment of the invention, each switch may include a control terminal in addition to the first terminal and the second terminal. The control terminal is connected to the control module and is used to receive the second strobe signal.
[0046] In this embodiment of the invention, multiple switches in the first gating unit can be partially integrated together to form a multi-channel analog switch. Thus, the first gating unit can include multiple multi-channel analog switches. For example, four switches can be integrated together to obtain a four-channel analog switch. Taking M data lines as an example, the first gating unit can include k2 (k2=M / 4) four-channel analog switches.
[0047] In this embodiment of the invention, the switch can be a single-pole single-throw analog switch.
[0048] In practice, multiple single-pole single-throw analog switches can be integrated together to form a multi-channel single-pole single-throw analog switch. The first gating unit can include multiple multi-channel single-pole single-throw analog switches.
[0049] It should be noted that the above-mentioned switch is not limited to a single-pole single-throw analog switch, but can also be other switches with a conduction resistance less than a preset conduction resistance threshold, an input impedance greater than a preset first impedance threshold, and an output impedance less than a preset second impedance threshold.
[0050] In one embodiment, the second gating unit may include a plurality of cascaded second multiplexers.
[0051] Each second multiplexer may include: The control terminal is used to receive the second strobe signal; Multiple input terminals are respectively connected to the second terminal of each switch in the first gating unit; The output terminal is connected to the signal processing unit. The second multiplexer is used to establish a connection between the input and output terminals of the selected target according to the second gating signal, so as to output the sensor signal output by the first gating unit to the signal processing unit.
[0052] In practice, the second multiplexer can, according to the second gating signal, open the transmission path between the selected target input terminal and the output terminal, and transmit the sensor signal output by the first gating unit to the signal processing unit, so that the signal processing unit can convert the sensor signal (analog voltage signal) into a digital signal and send it to the control module.
[0053] For example, the first gating unit includes 16 switches and can output 16 signals. Therefore, the second gating unit needs to provide 16 input terminals to connect to the second terminal of each of the 16 switches. If each second multiplexer includes 8 input terminals, then 2 second multiplexers need to be cascaded.
[0054] In one embodiment, the signal processing unit can be implemented using a high-precision analog-to-digital converter (ADC). The resolution of the ADC needs to be selected according to the dynamic range of the sensor signal to ensure that the quantization error is negligible (e.g., for a 0-3.3V signal, the resolution of a 12-bit ADC is about 0.8mV).
[0055] In summary, for each drive line selected device, the first gating unit of the signal acquisition module selects and buffers the sensor signals on each data line, the second gating unit selects and aggregates the sensor signals, and finally a signal processing unit realizes the signal processing of each sensor unit in the sensor array. In this way, it is not necessary to set up a separate signal processing circuit and signal acquisition circuit for each sensor unit, which can ensure the quality of sensor signals and reduce the cost of signal acquisition circuit.
[0056] Figure 3 This is a schematic diagram of a signal acquisition module provided in an embodiment of the present invention. Figure 3 As shown, taking a data line with 16 rows as an example, the first gating unit of the signal acquisition module includes four 4-channel analog switches (U1, U2, U3, and U4). Since the structure of each 4-channel analog switch is the same, U1 is used as an example. U1 includes four switches, each of which includes a first terminal (NO1), a second terminal (COM1), and a control terminal (IN1). NO2, NO3, and NO4 are the first terminals of other switches in U1, COM2, COM3, and COM4 are the second terminals of other switches in U1, and IN2, IN3, and IN4 are the control terminals of other switches in U1.
[0057] Figure 3In the signal acquisition module, the second selection unit includes two 8-to-1 second multiplexers (R1 and R2). Since each second multiplexer has the same structure, R1 is used as an example. R1 includes control terminals A, B, and C, eight input terminals (0, 1, 2, 3, 4, 5, 6, and 7), and one output terminal COMOUT / IN. The output terminals of each second multiplexer are connected in parallel and then connected to the signal processing unit.
[0058] In other words, Figure 3 In the first selection unit, there are 16 switches. The first end of each of the 16 switches is connected to a data line row1-row16, such as NO1 of U1 being connected to row1, NO2 being connected to row2, etc. The second end of each of the 16 switches is connected to each input of the second multiplexer, such as COM1 of U1 being connected to input 0 of R1, COM2 being connected to input 1 of R1, etc.
[0059] It should be noted that the above control module is not only used to output drive control signals, the first strobe signal and the second strobe signal, but also to control the start-up of the signal processing unit, data reading and processing (such as calibration, filtering and array image reconstruction), etc.
[0060] Figure 4 This is a structural diagram of another sensor system provided in an embodiment of the present invention. Figure 4 As shown, the signal acquisition circuit of this sensor system includes: a drive module, a signal acquisition module, a control module, a power supply module, and a host computer. The signal acquisition module includes a first gating unit, a second gating unit, and a signal processing unit.
[0061] The control module communicates with the signal processing unit via SPI, and the host computer connects to the control module via USB; the connection of the driver module, signal acquisition module, and control module can be found in [reference needed]. Figure 1 The connections mentioned above will not be elaborated upon here; The power supply module is used to power the drive module, signal acquisition module, control module, and USB.
[0062] The following is combined with Figure 4 The implementation process of signal acquisition in this signal acquisition circuit is explained.
[0063] First, the control module configures the switch address registers of the driver module, the first gating unit, and the second gating unit, and sets the signal processing unit parameters (such as sampling rate and reference voltage).
[0064] During the signal acquisition phase, the control module outputs a third gating signal and a driving voltage signal to the driving module according to the switch address register of the driving module; based on the third gating signal and the driving voltage signal, each column line of the sensor array is selected sequentially; after each column is selected, the row line scanning sub-loop is entered.
[0065] During the selection of each column line, the control module controls one of the switches in the first selection unit to be turned on according to the switch address register of the first selection unit. The sensor signal of the row line connected to the switch is buffered by the switch and then output to the second selection unit. Because the on-resistance of the switch is extremely low, it ensures that the sensor signal is impedance transformed in the early stage of transmission, reducing attenuation.
[0066] Then, the control module controls one input terminal of the second gating unit (which is the output terminal connected to the second terminal of the conduction switch of the first gating unit) to establish a connection with the output terminal according to the switch address register of the second gating unit, and transmits the sensor signal output by the first gating unit to the signal processing unit. In this way, multi-path conflicts can be avoided.
[0067] Next, the signal processing unit quantizes the sensor signal, that is, converts the sensor signal into a digital signal and sends it to the control module.
[0068] The control module stores the digital signals, updates the first, second, and third gating signals, and repeats the above steps until the digital signals corresponding to the sensor signals of each sensor unit in the sensor array are obtained, at which point the scan ends. The control module can then process all the digital signals, such as performing baseline correction and temperature compensation, and output a pressure distribution matrix.
[0069] In summary, the signal acquisition circuit provided in this embodiment of the invention, based on the low on-resistance, high input impedance, and low output impedance characteristics of the switch in the first gating unit, pre-buffers the sensor signal, significantly reducing the voltage division effect and distortion of the sensor signal by the analog switch network. This ensures signal integrity from the starting point of the acquisition signal path, thereby greatly improving measurement accuracy and the system's sensitivity to weak signal changes, and significantly enhancing signal quality. Furthermore, by utilizing the high input impedance and low output impedance characteristics of the switch, the circuit modules before and after the current stage are effectively isolated, reducing crosstalk and ensuring signal quality during transmission. In addition, the first gating unit uses a high-performance switch (such as a single-pole single-throw switch), and the second gating unit uses a low-cost multiplexer, achieving a balance between high performance and low cost.
[0070] Moreover, the signal acquisition circuit provided in this embodiment of the invention can complete the signal acquisition of a large-scale sensor array through a single signal processing unit, thereby reducing system complexity and power consumption.
[0071] This invention also provides a signal acquisition method, as described in the following embodiments. Since the principle behind this signal acquisition method is similar to that of the signal acquisition circuit described above, the implementation of this signal acquisition method can be found in the implementation of the signal acquisition circuit; repeated details will not be elaborated further.
[0072] like Figure 5 The diagram shows a flowchart of a signal acquisition method provided in an embodiment of the present invention. This method is applied to the aforementioned signal acquisition circuit and may include: Step 501: Selectively drive one of the multiple drive lines of the sensor array by controlling the drive module; Step 502: By controlling the first gating unit of the signal acquisition module, one of the multiple switches in the first gating unit is turned on, so as to transmit the sensor signal on the data line connected to the first terminal of the turned-on switch to the second gating unit; wherein, the on-resistance of each switch is less than a preset on-resistance threshold. Step 503: By controlling the second gating unit of the signal acquisition module, a connection is established between the target input terminal and the output terminal of the second gating unit, so as to output the sensor signal output by the first gating unit to the signal processing unit; the target input terminal is the input terminal of the second gating unit connected to the second terminal of the on switch; Step 504: The sensor signal is converted into a digital signal by the signal processing unit.
[0073] This invention also provides a sensor system, which includes a sensor array and the signal acquisition circuit described above.
[0074] This invention also provides a computer device, which includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements the above-described signal acquisition method.
[0075] This invention also provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the above-described signal acquisition method.
[0076] This invention also provides a computer program product, which includes a computer program that, when executed by a processor, implements the above-described signal acquisition method.
[0077] The signal acquisition circuit of this embodiment includes: a driving module, connected to multiple driving lines of a sensor array, for selectively driving one of the multiple driving lines in response to a driving control signal; the signal acquisition module includes a first gating unit, a second gating unit, and a signal processing unit; the first gating unit includes multiple switches; the second gating unit includes multiple input terminals and an output terminal; the first terminal of each switch is connected to a data line of the sensor array, and the second terminal is connected to an input terminal of the second gating unit; the output terminal of the second gating unit is connected to the signal processing unit; the first gating unit is used to respond to... In response to a first gating signal, one of a plurality of switches is turned on to transmit the sensor signal on the data line connected to the first terminal of the turned-on switch to the second gating unit; wherein, the on-resistance of each switch is less than a preset on-resistance threshold; the second gating unit is used to establish a connection between the target input terminal and the output terminal of the second gating unit in response to the second gating signal, so as to output the sensor signal output by the first gating unit to the signal processing unit; the target input terminal is the input terminal of the second gating unit connected to the second terminal of the turned-on switch; the signal processing unit is used to convert the sensor signal into a digital signal. Thus, in the signal acquisition circuit of this embodiment, since the on-resistance of the switch of the first gating unit of the signal acquisition module is less than the preset on-resistance threshold, the sensor signal on each data line is selected and buffered by the first gating unit, which can effectively reduce signal attenuation and ensure the quality of the sensor signal; then, the sensor signal output by the first gating unit is selected and collected by the second gating unit, and the sensor signal output by the signal processing unit is processed, which can reduce the scale, power consumption and cost of the signal acquisition circuit.
[0078] Those skilled in the art will understand that embodiments of the present invention can be provided as circuits, methods, systems, or computer program products. Therefore, the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention can take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.
[0079] This invention is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart illustrations and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.
[0080] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.
[0081] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.
[0082] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above descriptions are merely specific embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.
Claims
1. A signal acquisition circuit, characterized by comprising: include: The drive module is connected to multiple drive lines of the sensor array and is used to selectively drive one of the multiple drive lines in response to the drive control signal. The signal acquisition module includes a first gating unit, a second gating unit, and a signal processing unit; the first gating unit includes multiple switches; the second gating unit includes multiple input terminals and one output terminal; the first terminal of each switch is connected to a data line of the sensor array, and the second terminal is connected to an input terminal of the second gating unit; the output terminal of the second gating unit is connected to the signal processing unit. The first gating unit is used to respond to a first gating signal to turn on one of the multiple switches, so as to transmit the sensor signal on the data line connected to the first terminal of the turned switch to the second gating unit; wherein the on-resistance of each switch is less than a preset on-resistance threshold. The second gating unit is used to connect the target input terminal of the second gating unit with the output terminal of the second gating unit in response to the second gating signal, so as to output the sensor signal output by the first gating unit to the signal processing unit; The target input terminal is the input terminal of the second gating unit connected to the second terminal of the on / off switch; The signal processing unit is used to convert sensor signals into digital signals.
2. The signal acquisition circuit as described in claim 1, characterized in that, The drive line is a row line of the sensor array, and the data line is a column line of the sensor array; or the drive line is a column line of the sensor array, and the data line is a row line of the sensor array.
3. The signal acquisition circuit as described in claim 1, characterized in that, The drive module includes multiple cascaded first multiplexers; The first multiplexer includes: The control terminal is used to receive the third strobe signal in the drive control signal; The input terminal is used to receive the drive voltage signal from the drive control signal; Multiple output terminals are connected to each drive line of the sensor array, respectively; The first multiplexer is used to establish a connection between the input terminal of the first multiplexer and the selected output terminal according to the third strobe signal, so as to transmit the drive voltage signal to the drive line connected to the selected output terminal.
4. The signal acquisition circuit as described in claim 1, characterized in that, The on-resistance threshold is 5 ohms.
5. The signal acquisition circuit as described in claim 1, characterized in that, The input impedance of the switch is greater than a preset first impedance threshold; the output impedance of the switch is less than a preset second impedance threshold.
6. The signal acquisition circuit as described in claim 5, characterized in that, The first impedance threshold is 100 megohms, and the second impedance threshold is 1 ohm.
7. The signal acquisition circuit as described in any one of claims 4-6, characterized in that, The switch is a single-pole single-throw analog switch.
8. The signal acquisition circuit as described in claim 1, characterized in that, The second gating unit includes multiple cascaded second multiplexers; The second multiplexer includes: The control terminal is used to receive the second strobe signal; Multiple input terminals are respectively connected to the second terminal of each switch in the first gating unit; The output terminal is connected to the signal processing unit. The second multiplexer is used to establish a connection between the input terminal and the output terminal of the selected target according to the second gating signal, so as to output the sensor signal output by the first gating unit to the signal processing unit.
9. A signal acquisition method, characterized in that, Applied to the signal acquisition circuit as described in any one of claims 1-8, the circuit includes: By controlling the drive module, one of the multiple drive lines of the sensor array can be selectively driven; By controlling the first gating unit of the signal acquisition module, one of the multiple switches in the first gating unit is turned on, so as to transmit the sensor signal on the data line connected to the first terminal of the turned-on switch to the second gating unit; wherein, the on-resistance of each switch is less than a preset on-resistance threshold. By controlling the second gating unit of the signal acquisition module, a connection is established between the target input terminal and the output terminal of the second gating unit, so as to output the sensor signal output by the first gating unit to the signal processing unit; the target input terminal is the input terminal of the second gating unit connected to the second terminal of the on switch; The sensor signal is converted into a digital signal by the signal processing unit.
10. A sensor system, characterized in that, include: The sensor array and the signal acquisition circuit as described in any one of claims 1-8.