A signal detection circuit, device, chip, and electronic device

Abstract

This invention provides a signal detection circuit, device, chip, and electronic device. The signal detection circuit provided by this invention includes a reference voltage module, a gain amplifier, an analog-to-digital converter (ADC), and a digital module: the reference voltage module provides a reference voltage for the gain amplifier and the ADC; the gain amplifier amplifies the signal to be detected and outputs an amplified signal; the ADC converts the amplified signal into a digital signal; the digital module obtains the magnitude of the signal to be detected based on the digital signal, and also simultaneously sends an enable signal to the gain amplifier, the ADC, and the reference voltage module, so that the gain amplifier, the ADC, and the reference voltage module are simultaneously enabled. This signal detection circuit reduces the detection time for oscillating signals.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of signal detection, and in particular to a signal detection circuit, a device, a chip and an electronic device. BACKGROUND

[0002] Currently, in many electronic devices, the function of haptic feedback is integrated, which can create a unique personalized tactile experience for human-computer interaction, thereby providing a more realistic feeling for consumers. Haptic feedback is generally achieved by motor vibration, and the two common types are eccentric rotating mass (ERM) and linear resonant actuator (LRA). Motor vibration can produce strong and clear vibration, and even simulate haptic feedback effects that meet various application requirements, such as music melody, heartbeat, etc.

[0003] Generally, a driving chip is used to drive the linear resonant actuator, and the oscillation signal is detected in the gap of the driving to obtain the size of the oscillation signal. However, the detection time of the oscillation signal in the traditional detection process is relatively long. SUMMARY

[0004] The purpose of the present application is to provide a signal detection circuit, device, chip and electronic device to solve the technical problem of long detection time of the oscillation signal in the prior art.

[0005] The technical solution of the present application is as follows, a signal detection circuit is provided, comprising a reference voltage module, a gain amplifier, an analog-to-digital conversion module and a digital module: the reference voltage module is used to provide a reference voltage for the gain amplifier and the analog-to-digital converter; the gain amplifier is used to amplify the signal to be detected and output an amplified signal; the analog-to-digital conversion module is used to convert the amplified signal into a digital signal; the digital module is used to obtain the size of the signal to be detected according to the digital signal, and the digital module is also used to send a work enable signal to the gain amplifier, the analog-to-digital converter and the reference voltage module at the same time, so that the gain amplifier, the analog-to-digital conversion module and the reference voltage module are enabled at the same time.

[0006] Another technical solution of the present application is as follows, a signal detection device is also provided, comprising the signal detection circuit according to any one of the above technical solutions.

[0007] Another technical solution of the present application is as follows, a chip is also provided, comprising the signal detection circuit according to any one of the above technical solutions.

[0008] Another technical solution of the present application is as follows, an electronic device is also provided, comprising the signal detection circuit according to any one of the above technical solutions.

[0009] The beneficial effects of the present application are that the reference voltage module provides reference voltages for the gain amplifier and the analog-to-digital converter; the gain amplifier amplifies the signal to be detected and outputs an amplified signal; the analog-to-digital conversion module converts the amplified signal into a digital signal; the digital module obtains the size of the signal to be detected according to the digital signal, and the digital module simultaneously sends a working enable signal to the gain amplifier, the analog-to-digital converter and the reference voltage module, so that the gain amplifier, the analog-to-digital conversion module and the reference voltage module are simultaneously enabled; by simultaneously sending a working enable signal to the gain amplifier, the analog-to-digital converter and the reference voltage module through the digital module, the gain amplifier, the analog-to-digital conversion module and the reference voltage module are simultaneously enabled, so that the gain amplifier, the analog-to-digital conversion module and the reference voltage module start to establish at the same time, thereby saving the total establishment time of the system during detection, and reducing the detection time of the signal to be detected. BRIEF DESCRIPTION OF DRAWINGS

[0010] Figure 1 The structure block diagram of the signal detection circuit of the embodiment of the present application is shown in the figure.

[0011] Figure 2 The structure block diagram of the signal detection circuit of the embodiment of the present application is shown in the figure.

[0012] Figure 3 The structure block diagram of the signal detection circuit of the embodiment of the present application is shown in the figure.

[0013] Figure 4 The first circuit principle diagram of the pull-down module of the embodiment of the present application is shown in the figure.

[0014] Figure 5 The second circuit principle diagram of the pull-down module of the embodiment of the present application is shown in the figure.

[0015] Figure 6 The timing diagram of the embodiment of the present application is shown in the figure. DETAILED DESCRIPTION

[0016] In order to facilitate the understanding of the present application, the present application will be described more fully below with reference to the related drawings. The preferred embodiments of the present application are shown in the drawings. However, the present application can be realized in many different forms and is not limited to the embodiments described herein. On the contrary, these embodiments are provided to make the disclosure of the present application more thorough and comprehensive.

[0017] It should be noted that when an element is referred to as being "on" another element, it can be directly on the other element or intervening elements can also be present. When an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements can also be present.

[0018] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description herein is for describing particular embodiments only and is not intended to be limiting of the application.

[0019] Figure 1 is a structural block diagram of a signal detection circuit according to an embodiment of the present application. It should be noted that the signal detection circuit according to the present application is not limited to the structure shown in Figure 1 As shown in Figure 1 the signal detection circuit includes a reference voltage module Vref, a gain amplifier PGA, an analog-to-digital conversion module A / D, and a digital module Digital: the reference voltage module Vref is configured to provide a reference voltage for the gain amplifier PGA and the analog-to-digital converter A / D; the gain amplifier PGA is configured to amplify a to-be-detected signal and output an amplified signal; the analog-to-digital conversion module A / D is configured to convert the amplified signal into a digital signal; and the digital module Digital is configured to obtain the size of the to-be-detected signal according to the digital signal, and the digital module Digital is also configured to simultaneously send a working enable signal to the gain amplifier PGA, the analog-to-digital converter A / D, and the reference voltage module Vref, so as to enable the gain amplifier PGA, the analog-to-digital conversion module A / D, and the reference voltage module Vref to work simultaneously.

[0020] According to the embodiment of the present application, the digital module simultaneously sends the working enable signal to the gain amplifier, the analog-to-digital converter, and the reference voltage module, so that the gain amplifier, the analog-to-digital conversion module, and the reference voltage module are simultaneously enabled to work when the gain amplifier receives the to-be-detected signal, and the gain amplifier, the analog-to-digital conversion module, and the reference voltage module are simultaneously started to be established, thereby saving the total establishment time of the system during the detection process, and reducing the detection time of the to-be-detected signal.

[0021] In some embodiments, as Figure 2As shown, the signal detection circuit further comprises a pull-down module PD, which is configured to pull down the signal at the input end of the gain amplifier PGA to zero potential; and the digital module Digital is further configured to send an operation enable signal to the gain amplifier PGA, the analog-to-digital converter A / D and the reference voltage module Vref simultaneously after the signal at the input end of the gain amplifier PGA is pulled down to zero potential, so as to enable the gain amplifier PGA, the analog-to-digital conversion module A / D and the reference voltage module Vref simultaneously.

[0022] In the embodiment, the linear motor is driven by a high-voltage driving signal, and then the vibration signal of the linear motor, which can be a counter electromotive force signal, is detected by the signal detection circuit. After the signal at the input end of the gain amplifier PGA is pulled down to zero potential by the pull-down module PD, the digital module Digital sends an operation enable signal to the gain amplifier PGA, the analog-to-digital converter A / D and the reference voltage module Vref simultaneously, that is, the detection of the vibration signal is performed after the high-voltage driving signal at the input end of the gain amplifier PGA is discharged, so that the modules in the circuit can be prevented from being damaged by the high-voltage driving signal.

[0023] As an implementation, one end of the pull-down module is connected to the input end of the gain amplifier, and the other end is grounded.

[0024] In some embodiments, the digital module sends a control signal to the pull-down module, and the pull-down module is configured to pull down the signal at the input end of the gain amplifier to zero potential after receiving the control signal, that is, to pull down the residual voltage of the driving chip of the linear resonant motor after the driving chip is turned off to the ground, that is, to pull down the high-voltage driving signal output by the driving chip to the ground. The input end of the gain amplifier includes a first input end and a second input end. The first input end of the gain amplifier is a negative input end, and the second input end of the gain amplifier is a positive input end.

[0025] As an implementation, the reference voltage module comprises a bandgap reference source, which is further configured to receive a supply voltage and convert the supply voltage into a bandgap reference voltage; the bandgap reference source is in an always-on state after receiving the supply voltage; and a conversion unit is configured to convert the bandgap reference voltage into a stable reference voltage, and to receive an operation enable signal from the gain amplifier and the analog-to-digital conversion module simultaneously, so as to provide the reference voltage to the gain amplifier and the analog-to-digital conversion module.

[0026] The gain amplifier includes a fully balanced differential amplifier module, a decoder module, and a resistor switch array module. The resistance ratio of the negative feedback resistor divider in the fully balanced differential amplifier module determines the maximum gain of the amplifier. The decoding result of the decoder module controls the attenuation of the input signal by the resistor switch array module, thus enabling programmable gain of the gain amplifier. When the linear resonant motor stops working, it generates an oscillation signal, which is an analog signal. When detecting this signal, a reference voltage module provides a reference voltage to the gain amplifier and analog-to-digital converter module. The oscillation signal is amplified by the gain amplifier, and the analog-to-digital converter module converts the amplified signal from an analog signal to a digital signal. The digital module detects the magnitude of the signal to be detected based on the digital signal.

[0027] In other embodiments, the schematic diagram of the signal detection circuit is shown, such as... Figure 3 As shown, Figure 3 The signal detection circuit shown includes a digital module (digital), an analog-to-digital converter (A / D), a gain amplifier (PGA, programmable gain amplifier), a bandgap reference source (BGR), a conversion module (VS), a pull-down module (PD), and a voltage regulator (LDO, low-voltage linear regulator). The reference voltage module (Vref) includes the bandgap reference source (BGR) and the conversion module (VS). When the bandgap reference source (LDO) is in the ON state, it provides voltage to the digital module. The digital module (digital) controls the timing of the gain amplifier (PGA) and the A / D. At the start of oscillation signal detection, it sends a control signal to the pull-down module (PD). Upon receiving the control signal, the pull-down module (PD) pulls down the residual voltage after the driver chip is turned off to ground. Figure 3 The BGND and PGND interfaces are for external connections, and all three interfaces (BGND, PGND, and GND) are grounded. Figure 3 VREF is the reference voltage.

[0028] In one implementation, the pull-down module is used to turn on according to a first control signal sent by the digital module to pull down the signal at the input of the gain amplifier to zero potential, and to turn off according to a second control signal sent by the digital module; the digital module is also used to send an enable signal to the gain amplifier, the analog-to-digital converter and the reference voltage module simultaneously when the pull-down module is turned off.

[0029] In some embodiments, after receiving a detection command, the digital module sets the pull-down module to a high level, pulls the input of the gain amplifier to zero potential for reset, and pulls the residual voltage after the driver chip is turned off to ground; then it turns off the pull-down module, so that the pull-down module is at a low level. After the pull-down module is turned off, the gain amplifier receives the signal to be detected, and at the same time the digital module sends an enable signal. After receiving the enable signal, the reference voltage module, the gain amplifier and the analog-to-digital conversion module start to enable simultaneously.

[0030] As an example, the bandgap reference source is normally open. Before detecting the oscillation signal, the pull-down module is at a low level. When oscillation signal detection begins, a control signal is sent to the pull-down module, causing it to go high and pull down the residual voltage after the driver chip is turned off to ground. After this process is complete, the pull-down module can be returned to a low level. At this time, the digital module enables the gain amplifier and analog-to-digital converter simultaneously. The gain amplifier receives the signal to be detected and amplifies it to obtain the amplified signal. The analog-to-digital converter converts the amplified signal into a digital signal, and the digital module obtains the magnitude of the signal to be detected based on the digital signal. By keeping the bandgap reference source in a normally open state, when signal detection begins, the bandgap reference source does not need to re-establish the bandgap reference voltage, saving the bandgap reference source establishment time and thus reducing the oscillation signal detection time.

[0031] In one implementation, the pull-down module includes one or more pull-down units, one end of which is connected to the input of the gain amplifier, and the other end is grounded.

[0032] In one implementation, the pull-down unit includes: a first resistor, one end of which is connected to the input terminal of the gain amplifier; and a switching transistor, one end of which is connected to the other end of the first resistor, and the other end of which is grounded. The switching transistor can be a MOSFET.

[0033] In some embodiments, the switching transistor can be a MOSFET. The first circuit schematic of the pull-down module is shown below. Figure 4 As shown, Figure 4 It includes four pull-down units, and the gate of the MOS transistor in each pull-down unit is used to receive the enable signal of the pull-down module.

[0034] In some embodiments, the second circuit schematic of the pull-down module is as follows: Figure 5 As shown, Figure 5 It includes one dropdown unit.

[0035] As an example, after the power supply voltage source is powered on, the bandgap reference source is always on, and in order to meet the requirement of low power consumption, a low-power bandgap reference source architecture can be selected. In the detection stage, the pull-down interface of the external signal is turned on, and the pull-down module pulls the signal to a low potential. The pull-down resistance can be selected in an array mode to increase the impedance of a single secondary electrostatic discharge protection resistance (i.e. the resistance in Figure 4 or Figure 5 ) to prevent damage to the circuit while ensuring the speed of the pull-down. After the driving chip is turned off, after waiting for the residual charge to be cleared, the interface of the pull-down module is turned off, the reference voltage module, the gain amplifier and the digital-to-analog conversion circuit are enabled. Since the reference voltage module, the gain amplifier and the digital-to-analog conversion circuit are enabled at the same time, and a low-power bandgap reference source is always on, there is no need to establish the bandgap reference source again, thereby reducing the time for the circuit to detect the signal.

[0036] As an embodiment, the signal detection circuit further includes a second resistance, a third resistance, a first variable resistance and a second variable resistance. One end of the second resistance is connected to the first input end of the gain amplifier, and the other end is connected to the output end of the gain amplifier. One end of the third resistance is used to receive a reference voltage, and the other end is connected to the second input end of the gain amplifier. One end of the first variable resistance is used to receive a first input signal, and the other end is connected to the first input end of the gain amplifier. One end of the second variable resistance is used to receive a second input signal, and the other end is connected to the second input end of the gain amplifier.

[0037] In some embodiments, the timing diagram of the power supply voltage source, the bandgap reference source, the pull-down module, the reference voltage, the gain amplifier and the analog-to-digital conversion module is as shown in Figure 6 . Figure 6 In the timing diagram of Figure 6 , as the voltage of the power supply voltage source gradually increases, the enable signal of the bandgap reference source changes from low to high. When starting to detect the signal, the digital module sends a control signal to the pull-down module, which is the enable signal of the pull-down module. At this time, the enable signal of the pull-down module changes from low to high, and the pull-down module pulls the residual voltage after the driving chip is turned off to ground. Then it becomes low again. At this time, the enable signals of the reference voltage, the gain amplifier and the analog-to-digital conversion module all change from low to high. The level state of the enable signals of the pull-down module, the reference voltage, the gain amplifier and the analog-to-digital conversion module can be controlled by the digital module.

[0038] In some embodiments, the signal detection circuit further comprises a voltage stabilizer, which can be an LDO. The voltage stabilizer is configured to receive a reference voltage and provide a voltage for the digital module. In this case, after the voltage stabilizer receives the reference voltage, the reference voltage module converts the reference voltage output by the bandgap reference source into a stable reference voltage, and does not directly provide the reference voltage to the gain amplifier and the analog-to-digital conversion module. Instead, the reference voltage is provided to the gain amplifier and the analog-to-digital conversion module after the digital module sends a work enable signal to the gain amplifier and the analog-to-digital conversion module.

[0039] The signal detection circuit provided by the embodiments of the present application comprises a reference voltage module configured to provide a reference voltage for a gain amplifier and an analog-to-digital converter; a pull-down module configured to pull down a signal at an input end of the gain amplifier to zero potential; the gain amplifier configured to amplify a to-be-detected signal and output an amplified signal; an analog-to-digital conversion module configured to convert the amplified signal into a digital signal; and a digital module configured to obtain a size of the to-be-detected signal according to the digital signal. After the digital module pulls down the signal at the input end of the gain amplifier to zero potential, the digital module simultaneously sends a work enable signal to the gain amplifier, the analog-to-digital converter, and the reference voltage module, so that the gain amplifier, the analog-to-digital conversion module, and the reference voltage module are simultaneously enabled. Compared with a conventional detection process, in which a common mode establishment circuit is used to enable the reference voltage module, the gain amplifier module, and the analog-to-digital conversion module in sequence, the establishment time of the circuit is relatively long. In the embodiments of the present application, after the digital module pulls down the signal at the input end of the gain amplifier to zero potential, the digital module simultaneously sends a work enable signal to the gain amplifier, the analog-to-digital converter, and the reference voltage module, so that the gain amplifier, the analog-to-digital conversion module, and the reference voltage module are simultaneously enabled when the gain amplifier receives the to-be-detected signal. As a result, the gain amplifier, the analog-to-digital conversion module, and the reference voltage module are simultaneously established, thereby saving the total establishment time of the system during the detection process and reducing the detection time of the to-be-detected signal.

[0040] It should be noted that, after the external high-voltage module is turned off and the input end capacitance charge of the signal detection circuit is emptied by the pull-down module, the oscillation signal is detected, which is beneficial to protect the safety of the signal detection circuit. After the size of the to-be-detected signal is obtained, the size of the to-be-detected signal can be used to obtain the frequency of the linear resonant motor, and the frequency of the linear resonant motor can be adjusted so that the linear resonant motor vibrates at the resonant frequency.

[0041] The embodiments of the present application provide a signal detection device, which comprises the signal detection circuit according to any one of the above embodiments.

[0042] The embodiments of the present application provide a chip, which comprises the signal detection circuit according to any one of the above embodiments.

[0043] The embodiment of the present application provides an electronic device, comprising the signal detection circuit in any of the above embodiments.

[0044] The technical features of the above embodiments can be combined in any manner, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, however, as long as the combination of the technical features does not exist contradictory, it should be considered as the scope of the present application.

[0045] The above embodiments only express the preferred embodiments of the present application, which are described in detail and specifically, but should not be understood as the limitation of the patent scope of the present application. It should be pointed out that for those skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which all belong to the protection scope of the present application. Therefore, the protection scope of the present application patent should be subject to the appended claims.

Claims

1. A signal detection circuit, characterized in that, Includes a reference voltage module, gain amplifier, analog-to-digital converter module, pull-down module, and digital module: The reference voltage module is used to provide a reference voltage for the gain amplifier and the analog-to-digital converter module; The gain amplifier is used to amplify the signal to be detected and output an amplified signal; The analog-to-digital converter module is used to convert the amplified signal into a digital signal; The pull-down module is used to pull down the signal at the input of the gain amplifier to zero potential; The digital module is used to obtain the magnitude of the signal to be detected based on the digital signal. The digital module is also used to send a working enable signal to the gain amplifier, the analog-to-digital converter module and the reference voltage module simultaneously after the signal at the input terminal of the gain amplifier is pulled down to zero potential, so that the gain amplifier, the analog-to-digital converter module and the reference voltage module are enabled at the same time.

2. The signal detection circuit according to claim 1, characterized in that, One end of the pull-down module is connected to the input terminal of the gain amplifier, and the other end is grounded.

3. The signal detection circuit according to claim 2, characterized in that, The pull-down module is used to turn on according to the first control signal sent by the digital module to pull down the signal at the input terminal of the gain amplifier to zero potential, and to turn off according to the second control signal sent by the digital module. The digital module is also used to send a working enable signal to the gain amplifier, the analog-to-digital converter, and the reference voltage module simultaneously when the pull-down module is turned off.

4. The signal detection circuit according to claim 2, characterized in that, The pull-down module includes one or more pull-down units, one end of which is connected to the first input terminal of the gain amplifier, and the other end is grounded.

5. The signal detection circuit according to claim 4, characterized in that, The drop-down unit includes: A first resistor, one end of which is connected to the input terminal of the gain amplifier; and A switching transistor, one end of which is connected to the other end of the first resistor, and the other end of which is grounded.

6. The signal detection circuit according to claim 5, characterized in that, The signal detection circuit further includes a second resistor, a third resistor, a first variable resistor, and a second variable resistor. One end of the second resistor is connected to the first input terminal of the gain amplifier, and the other end is connected to the output terminal of the gain amplifier. One end of the third resistor is used to receive a reference voltage, and the other end is connected to the second input terminal of the gain amplifier. One end of the first variable resistor is used to receive a first input signal, and the other end is connected to the first input terminal of the gain amplifier. One end of the second variable resistor is used to receive a second input signal, and the other end is connected to the second input terminal of the gain amplifier.

7. The signal detection circuit according to any one of claims 1 to 6, characterized in that, The reference voltage module includes: The bandgap reference source is also used to receive the supply voltage and convert the supply voltage into a bandgap reference voltage; the bandgap reference source is normally open after receiving the supply voltage. The conversion unit is used to convert the bandgap reference voltage into a stable reference voltage, and simultaneously receive the working enable signal with the gain amplifier and the analog-to-digital converter module to provide the reference voltage to the gain amplifier and the analog-to-digital converter module.

8. A signal detection device, characterized in that, Includes the signal detection circuit as described in any one of claims 1 to 7.

9. A chip, characterized in that, Includes the signal detection circuit as described in any one of claims 1 to 7.

10. An electronic device, characterized in that, Includes the signal detection circuit as described in any one of claims 1 to 7.

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