Analog-to-digital conversion circuit, chip and electronic equipment

Abstract

According to the analog-to-digital conversion circuit, the chip and the electronic equipment provided by the embodiment of the invention, one or more first digital signals are obtained through at least one first analog-to-digital conversion module according to the analog input signal; a first frequency selection circuit selects a required target digital signal or an interference signal to be filtered and eliminated from different first digital signals, and a signal output circuit outputs a digital conversion signal according to one or more required target digital signals or interference signals to be filtered and eliminated. According to the invention, the required target digital signal can be reserved or the interference signal to be filtered and eliminated can be removed, and only the signal within the required frequency range is allowed to generate the digital conversion signal, so that the digital signal filtering effect is improved, and the interference of the frequency signal beyond the required frequency range is reduced.

Description

Technical Field

[0001] The present application relates to the field of integrated circuit technology, and in particular to an analog-to-digital conversion circuit, a chip and an electronic device. Background Art

[0002] In the background technology, analog-to-digital conversion circuits usually use digital filters to filter out interference signals outside the required frequency range. Since the filtering frequency range of the digital filter is limited, some interference signals cannot be filtered out by the digital filter. These interference signals that cannot be filtered out will be mixed into the digital output signal, which is not conducive to improving the filtering effect of the interference signal. Summary of the invention

[0003] In view of the above problems, the embodiments of the present application provide an analog-to-digital conversion circuit, a chip and an electronic device to solve the above technical problems.

[0004] In a first aspect, an embodiment of the present application provides an analog-to-digital conversion circuit, comprising:

[0005] One or more first analog-to-digital conversion modules, configured to convert an analog input signal into a first digital signal;

[0006] A first frequency selection circuit, used for extracting a first selection signal within a preset frequency range corresponding to the first digital signal, wherein different first selection signals correspond to different preset frequency ranges;

[0007] The signal output circuit is used to output a digital conversion signal according to one or more of the first selection signals.

[0008] In a second aspect, an embodiment of the present application provides an analog-to-digital conversion circuit, including:

[0009] A second frequency selection circuit, used for extracting second selection signals within one or more preset frequency ranges from the analog input signal, wherein different second selection signals correspond to different preset frequency ranges;

[0010] One or more third analog-to-digital conversion modules, configured to convert the corresponding second selection signal into a third digital signal;

[0011] The signal output circuit is used to output a digital conversion signal according to one or more of the third digital signals.

[0012] In a third aspect, an embodiment of the present application provides a chip, wherein the chip includes the above-mentioned analog-to-digital conversion circuit.

[0013] In a fourth aspect, an embodiment of the present application provides an electronic device, wherein the electronic device includes the above-mentioned chip.

[0014] The analog-to-digital conversion circuit, chip and electronic device provided in the embodiments of the present application obtain one or more first digital signals according to an analog input signal through at least one first analog-to-digital conversion module, select the required target digital signal or the interference signal to be filtered out from different first digital signals through a first frequency selection circuit, and the signal output circuit outputs a digital conversion signal according to the one or more required target digital signals or the interference signal to be filtered out. In the above manner, the required target digital signal can be retained or the interference signal to be filtered out can be removed, and only the signal within the required frequency range is allowed to generate the digital conversion signal, thereby improving the effect of digital signal filtering and reducing the interference of frequency signals outside the required frequency range.

[0015] These and other aspects of the present application will become more clearly understood in the description of the following embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0017] Figure 1 An application scenario diagram of the analog-to-digital conversion circuit provided in an embodiment of the present application is shown.

[0018] Figure 2 A schematic diagram of the structure of an analog-to-digital conversion circuit provided in an embodiment of the present application is shown.

[0019] Figure 3 A schematic diagram of the structure of an analog-to-digital conversion circuit provided in an embodiment of the present application is shown.

[0020] Figure 4 A schematic diagram of the structure of an analog-to-digital conversion circuit provided in an embodiment of the present application is shown.

[0021] Figure 5 A schematic diagram of the structure of an analog-to-digital conversion circuit provided in an embodiment of the present application is shown.

[0022] Figure 6 A schematic diagram of the structure of a first automatic gain control unit in an analog-to-digital conversion circuit provided in an embodiment of the present application is shown.

[0023] Figure 7 A schematic diagram of the structure of a detection circuit in an analog-to-digital conversion circuit provided in an embodiment of the present application is shown.

[0024] Figure 8 A schematic diagram of the structure of an integration circuit in an analog-to-digital conversion circuit provided in an embodiment of the present application is shown.

[0025] Fig. 9 A schematic diagram of the structure of an analog-to-digital conversion circuit provided in an embodiment of the present application is shown.

[0026] Fig.10 A schematic diagram of the structure of an analog-to-digital conversion circuit provided in an embodiment of the present application is shown.

[0027] Fig.11 A schematic diagram of the structure of an analog-to-digital conversion circuit provided in an embodiment of the present application is shown.

[0028] Fig.12 A schematic diagram of the structure of a chip provided in an embodiment of the present application is shown.

[0029] Fig.13 A schematic diagram of the structure of a chip provided in an embodiment of the present application is shown.

[0030] Fig.14 A schematic diagram of the structure of an electronic device provided in an embodiment of the present application is shown.

[0031] Fig.15 A schematic diagram of the structure of an electronic device provided in an embodiment of the present application is shown. DETAILED DESCRIPTION

[0032] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0033] In order to enable those skilled in the art to better understand the solutions of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of the present application.

[0034] In the embodiments of the present application, it should be noted that, in this article, relational terms such as first and second, etc. are merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations.

[0035] Moreover, the terms "comprises," "comprising," or any other variation thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article, or apparatus that includes the element.

[0036] In the description of the embodiments of the present application, words such as "example" or "for example" are used to indicate examples, illustrations or descriptions. Any embodiment or design described as "example" or "for example" in the embodiments of the present application is not to be interpreted as being more preferred or having more advantages than another embodiment or design. The use of words such as "example" or "for example" is intended to present relative concepts in a clear manner.

[0037] In addition, the "plurality" in the embodiments of the present application refers to two or more than two. In view of this, in the embodiments of the present application, "plurality" can also be understood as "at least two". "At least one" can be understood as one or more, for example, one, two or more. For example, including at least one means including one, two or more, and there is no limit on which ones are included. For example, including at least one of A, B and C, then A, B, C, A and B, A and C, B and C, or A, B and C can be included.

[0038] It should be noted that, in the embodiments of the present application, "and / or" describes the association relationship of the associated objects, indicating that three relationships may exist. For example, A and / or B may represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / ", unless otherwise specified, generally indicates that the associated objects before and after are in an "or" relationship.

[0039] It should be noted that in the embodiments of the present application, "connection" can be understood as electrical connection, and the connection between two electrical components can be a direct or indirect connection between the two electrical components. For example, the connection between A and B can be either a direct connection between A and B or an indirect connection between A and B through one or more other electrical components.

[0040] See also Figure 1 As shown, the analog-to-digital conversion circuit 100 of the present application can be applied in Figure 1The measurement circuit 200 shown in the figure, the signal processing circuit 200 includes a sensor 201, an amplifier circuit 202, an analog-to-digital conversion circuit 100 and a digital signal processing circuit 203, wherein the sensor 201 is used to collect a voltage signal, the amplifier circuit 202 is used to amplify the voltage signal to output an amplified voltage signal, the analog-to-digital conversion circuit 100 converts the amplified voltage signal into a corresponding digital signal, and the digital signal processing circuit 203 receives the digital signal and outputs a measurement result according to the digital signal.

[0041] The present application embodiment provides an analog-to-digital conversion circuit 100. Figure 2 As shown, the analog-to-digital conversion circuit 100 includes a first analog-to-digital conversion module 11 , a first frequency selection circuit 12 and a signal output circuit 13 .

[0042] The number of the first analog-to-digital conversion module 11 can be one or more. For the convenience of description, Figure 2 , multiple first analog-to-digital conversion modules 11 are exemplarily shown, respectively labeled as first analog-to-digital conversion modules 11-1 to 11-n, where n is a natural number greater than 1. The first analog-to-digital conversion module 11-k is used to convert an analog input signal into a first digital signal D1-k, where 1≤k≤n, and k is a natural number. In this embodiment, the analog input signal may include a DC signal and / or an AC signal.

[0043] When there are multiple first analog-to-digital conversion modules 11 , the analog input signal may be divided into multiple paths, and each path of the analog input signal enters a corresponding first analog-to-digital conversion module 11 .

[0044] The first frequency selection circuit 12 is used to extract the first selection signal D2-k within the corresponding preset frequency range in the first digital signal D1-k, and different first selection signals D2-k correspond to different preset frequency ranges F1-k. The first frequency selection circuit 12 extracts the first selection signal D2-k from each first digital signal D1-k according to the corresponding preset frequency range F1-k.

[0045] In this embodiment, the preset frequency range can be a passing frequency range. In this case, the first selection signal corresponding to the passing frequency range is the required target digital signal, and the unextracted part of the first digital signal is filtered out; the preset frequency range can also be an attenuation frequency range. In this case, the first selection signal corresponding to the attenuation frequency range is the first interference signal that needs to be filtered out.

[0046] The signal output circuit 13 is used to output a digital conversion signal according to one or more first selection signals. In this embodiment, the first selection signal whose preset frequency range is the passing frequency range is superimposed, or the first selection signal whose preset frequency range is the attenuation frequency range is subtracted, and the output digital conversion signal only includes the signal within the required frequency range.

[0047] The analog-to-digital conversion circuit of this embodiment obtains one or more first digital signals according to an analog input signal through at least one first analog-to-digital conversion module, selects a desired target digital signal or an interference signal to be filtered out from different first digital signals through a first frequency selection circuit, and the signal output circuit outputs a digital conversion signal according to the one or more desired target digital signals or the interference signal to be filtered out. In the above manner, the desired target digital signal can be retained or the interference signal to be filtered out can be removed, and only signals within the desired frequency range are allowed to generate digital conversion signals, thereby improving the effect of digital signal filtering and reducing the interference of frequency signals outside the desired frequency range.

[0048] As an implementation, see Figure 3 As shown, each of the one or more first analog-to-digital conversion modules 11 includes a first analog-to-digital conversion unit 111 and a first automatic gain control unit 112. Figure 3 A first analog-to-digital conversion module 11 is exemplarily shown, wherein a first automatic gain control unit 112 is used to control the amplitude of an analog input signal input into the corresponding first analog-to-digital conversion module 11 according to the amplitude of a corresponding first selection signal; the first analog-to-digital conversion unit 111 is used to convert the analog input signal after the amplitude is adjusted by the first automatic gain control unit 112 into a first digital signal.

[0049] In this embodiment, for each first analog-to-digital conversion module, the analog input signal is gain amplified according to the corresponding first selection signal through the first automatic gain control unit, so that each first selection signal can achieve an optimal signal-to-noise ratio, which is beneficial to improving the signal quality of the analog-to-digital conversion.

[0050] As an implementation manner, the preset frequency ranges corresponding to all the first selection signals are respectively the passing frequency ranges, and thus, one or more first selection signals are respectively the target digital signals.

[0051] The signal output circuit 13 is used to output a digital conversion signal according to one or more target digital signals.

[0052] In this embodiment, all first selection signals are signals within the required frequency range. When one first analog-to-digital conversion module 11 is provided, the signal output circuit 13 can directly output the unique first selection signal as a digital conversion signal; when multiple first analog-to-digital conversion modules 11 are provided, the signal output circuit 13 can superimpose multiple first selection signals and output them, and the digital conversion signal is the superposition of multiple first selection signals.

[0053] In this embodiment, the digital signals within the required preset frequency ranges are superimposed to form a digital conversion signal, thereby avoiding interference of signals outside the required frequency range on the digital conversion signal.

[0054] In some embodiments, when an analog input signal is gain amplified according to a corresponding first selection signal through a first automatic gain control unit, the signal output circuit 13 generates a first selection recovery signal according to each first selection signal and a corresponding gain amplification factor, and then outputs a first selection recovery signal as a digital conversion signal, or superimposes multiple first selection recovery signals to obtain a digital conversion signal, wherein the first selection recovery signal is the corresponding first selection signal multiplied by the inverse of the gain amplification factor.

[0055] As an implementation manner, the preset frequency ranges corresponding to all first selection signals are attenuation frequency ranges, so one or more first selection signals are first interference signals. Figure 4 As shown, the analog-to-digital conversion circuit 100 of this embodiment further includes a second analog-to-digital conversion module 14 for converting the analog input signal into a second digital signal. The signal output circuit 13 is used to output a digital conversion signal according to the second digital signal and one or more first interference signals.

[0056] In this embodiment, the preset frequency ranges corresponding to all first selection signals are attenuation frequency ranges respectively. When one first analog-to-digital conversion module 11 is provided, the signal output circuit 13 can subtract the second digital signal from the unique first selection signal to output a digital conversion signal; when multiple first analog-to-digital conversion modules 11 are provided, the signal output circuit 13 can superimpose multiple first selection signals to obtain an interference superposition signal, and then subtract the second digital signal from the interference superposition signal to output a digital conversion signal.

[0057] In this embodiment, the second digital signal corresponding to the complete analog input signal is subtracted from the superimposed signal of each first interference signal, thereby avoiding the influence of the signal within the interference frequency range on the digital conversion signal.

[0058] In some embodiments, when the analog input signal is gain amplified according to the corresponding first selection signal through the first automatic gain control unit, the signal output circuit 13 generates a first selection recovery signal according to each first selection signal and the corresponding gain amplification factor, superimposes multiple first selection recovery signals to obtain an interference superposition signal, and subtracts the second digital signal from the interference superposition signal, wherein the first selection recovery signal is the first selection signal multiplied by the inverse of the gain amplification factor.

[0059] In some embodiments, the second analog-to-digital conversion module 14 includes a second analog-to-digital conversion unit 141 and a second automatic gain control unit 142; wherein the second automatic gain control unit 142 is used to control the amplitude of the analog input signal input into the second analog-to-digital conversion module 14 according to the amplitude of the second digital signal; the second analog-to-digital conversion unit 141 is used to convert the analog input signal after the amplitude is adjusted by the second automatic gain control unit 142 into the second digital signal.

[0060] In this embodiment, for the second analog-to-digital conversion module, the analog input signal is gain-amplified according to the corresponding second digital signal through the second automatic gain control unit, so that the second digital signal can achieve an optimal signal-to-noise ratio, which is further beneficial to improving the signal quality of the analog-to-digital conversion.

[0061] In some embodiments, the signal output circuit 13 can obtain a second digital recovery signal based on the second digital signal and the corresponding gain amplification factor, and then subtract the second digital recovery signal from the interference superposition signal to obtain a digital conversion signal, wherein the second digital recovery signal is the second digital signal multiplied by the inverse of the gain amplification factor.

[0062] As an implementation manner, the preset frequency range may correspond to a frequency greater than or equal to a lower limit frequency.

[0063] As an implementation manner, the preset frequency range may correspond to being less than or equal to an upper frequency limit.

[0064] As an implementation manner, the preset frequency range may correspond to being greater than or equal to a lower frequency limit and less than or equal to an upper frequency limit.

[0065] As an implementation, see Figure 5 The first frequency selection circuit 12 may include one or more first frequency selection units 12 a , and the multiple first frequency selection units 12 a are respectively arranged in one-to-one correspondence with the multiple first analog-to-digital conversion modules 11 .

[0066] In some embodiments, the first frequency selection unit 12a can implement a bandpass, lowpass or highpass filter function when passing a signal in a preset frequency range. For example, the first frequency selection unit 12a can be a bandpass filter circuit, a lowpass filter circuit or a highpass filter circuit.

[0067] As an implementation, see Figures 6 to 8 As shown, the first automatic gain control unit 112 may include a digital-to-analog conversion circuit 1121 , a detection circuit 1122 , and an integration circuit 1123 .

[0068] The digital-to-analog conversion circuit 1121 is used to convert the first selection signal into a corresponding first selection analog signal.

[0069] The detection circuit 1122 includes a plurality of comparators and a logic control module. Each comparator is used to compare the first selected analog signal with a corresponding threshold voltage to obtain a comparison result.

[0070] In some embodiments, the threshold voltages of the plurality of comparators decrease exponentially, for example, Figure 8 In the example shown, four comparators are set, and the threshold voltages of the four comparators are VREF, 2 -1 VREF, 2 -2 VREF and 2 - 3 VREF, the first selection analog signal is respectively connected to four voltage thresholds VREF, 2 -1 VREF, 2 -2 VREF and 2 -3 VREF is compared and four comparison results are output to the logic control module.

[0071] The logic control module is used to determine the voltage range of the first selected analog signal according to the comparison result of each comparator, determine the gain magnification according to the voltage range, and output the gain selection signal according to the gain magnification. Figure 8 For example, if the first selected analog signal is greater than or equal to 2 -1 VREF, the gain amplification factor is 1; if the first selected analog signal is greater than or equal to 2 -2 VREF and less than 2 -1 VREF, the gain amplification factor is 2; if the first selected analog signal is greater than or equal to 2 -3 VREF and less than 2 -2 VREF, the gain amplification factor is 4; if the first selected analog signal is less than 2 -3 VREF, the gain amplification factor is 8.

[0072] The integration circuit 1123 includes a first branch, a plurality of second branches and an amplifying output circuit, wherein the first branch includes a first capacitor Cs, a first control switch K1 connected to a first end of the first capacitor Cs, and a first grounding switch K2 connected to a first end of the first capacitor Cs, the other end of the first grounding switch K2 is grounded, and the first end of the first capacitor Cs receives an analog input signal through the first control switch K1; each second branch includes a second capacitor Cf, a second control switch SW-k connected to a first end of the second capacitor Cf, and a second grounding switch SW'-k connected to a first end of the second capacitor Cf, the other end of the second grounding switch SW'-k is grounded, and the first end of the second capacitor Cf receives an analog input signal through the second control switch K1. The switch SW-k receives the first voltage signal, k is a natural number less than or equal to m, and m is the number of the second branches; the amplification output circuit includes an amplifier OP and an output capacitor Ca, the amplifier OP includes a first input terminal op1, a second input terminal op2, a first output terminal op3 and a second output terminal op4, the first input terminal op1 of the amplifier OP is respectively connected to the second end of the first capacitor Cs and the second end of each second capacitor Cf, the two ends of the output capacitor Ca are respectively connected to the first input terminal op1 and the first output terminal op3 of the amplifier OP, the second input terminal op2 of the amplifier OP is used to receive the second voltage signal, and the second output terminal op4 of the amplifier OP is used to output the analog input signal after gain amplification. The first branch is a sampling branch, and each second branch is a gain amplification branch. The gain amplification factor of the second branch is the ratio of the capacitance value of the first capacitor Cs to the capacitance value of the second capacitor Cf. The gain selection signal is used to turn on the second control switch SW-k of the second branch corresponding to the gain amplification factor to gain amplify the analog input signal.

[0073] As an implementation manner, the second automatic gain control unit 142 may also be implemented as follows: Figures 6 to 8 The implementation methods shown are not described one by one here.

[0074] The present application embodiment provides an analog-to-digital conversion circuit 300. Fig. 9 As shown, the analog-to-digital conversion circuit 300 includes a second frequency selection circuit 31 , a third analog-to-digital conversion module 32 and a signal output circuit 33 .

[0075] The second frequency selection circuit 31 is used to extract a second selection signal within a preset frequency range from the analog input signal or to extract multiple second selection signals within multiple different preset frequency ranges from the analog input signal. Fig.10 exemplarily shows the extraction of multiple second selection signals, which are second selection signals A1-1 to A1-n, n is a natural number greater than 1, and different second selection signals A1-k correspond to different preset frequency ranges F2-k.

[0076] In this embodiment, the preset frequency range can be a passing frequency range. In this case, the second selection signal corresponding to the passing frequency range is the required target analog signal, and the unextracted part of the analog input signal is filtered out; the preset frequency range can also be an attenuation frequency range. In this case, the second selection signal corresponding to the attenuation frequency range is the second interference signal that needs to be filtered out.

[0077] The number of the third analog-to-digital conversion modules 32 can be set to one or more, and the number of the third analog-to-digital conversion modules 32 is the same as the number of the preset frequency ranges and the number of the second selection signals. Fig. 9 , multiple third analog-to-digital conversion modules 32 are exemplarily shown, respectively labeled as third analog-to-digital conversion modules 32-1 to 32-n, where n is a natural number greater than 1. The third analog-to-digital conversion module 32-k is used to convert the corresponding second selection signal A1-k into a third digital signal D3-k, where 1≤k≤n, and k is a natural number.

[0078] The signal output circuit 33 is used to output a digital conversion signal according to one or more third digital signals. In this embodiment, the third digital signal whose preset frequency range is the passing frequency range is superimposed, or the third digital signal whose preset frequency range is the attenuation frequency range is subtracted, and the output digital conversion signal only includes the signal within the required frequency range.

[0079] The analog-to-digital conversion circuit of this embodiment selects the required target analog signal or the interference signal to be filtered out from the analog input signal through the second frequency selection circuit, obtains one or more third digital signals according to the required target analog signal or the interference signal to be filtered out through at least one third analog-to-digital conversion module, and the third digital signal is the required target digital signal or the interference signal to be filtered out. The signal output circuit outputs a digital conversion signal according to the one or more required target digital signals or the interference signal to be filtered out. In the above manner, the required target digital signal can be retained or the interference signal to be filtered out can be removed, and only the signal within the required frequency range is allowed to generate the digital conversion signal, thereby improving the effect of digital signal filtering and reducing the interference of frequency signals outside the required frequency range.

[0080] As an implementation, see Fig.10 As shown, each of the one or more third analog-to-digital conversion modules 32 includes a third analog-to-digital conversion unit 321 and a third automatic gain control unit 322 . Fig.11A third analog-to-digital conversion module 32 is exemplarily shown, wherein a third automatic gain control unit 322 is used to control the amplitude of a second selection signal input into the corresponding third analog-to-digital conversion module according to the amplitude of a corresponding third digital signal; and a third analog-to-digital conversion unit 321 is used to convert the corresponding second selection signal into a third digital signal.

[0081] In this embodiment, for each third analog-to-digital conversion module, the second selection signal is gain amplified according to the corresponding third digital signal through the third automatic gain control unit, so that each third digital signal can achieve an optimal signal-to-noise ratio, which is beneficial to improving the signal quality of the analog-to-digital conversion.

[0082] As an implementation manner, the preset frequency ranges corresponding to all second selection signals are respectively the passing frequency ranges, so that one or more second selection signals are respectively the target analog signals, and one or more third digital signals are respectively the target digital signals.

[0083] The signal output circuit 33 is used to output a digital conversion signal according to one or more third digital signals.

[0084] In this embodiment, all second selection signals are signals within the required frequency range. When one third analog-to-digital conversion module 32 is provided, the signal output circuit 33 can directly output the unique third digital signal as a digital conversion signal; when multiple third analog-to-digital conversion modules 32 are provided, the signal output circuit 33 can superimpose multiple third digital signals and output them, and the digital conversion signal is the superposition of multiple third digital signals.

[0085] In this embodiment, the digital signals within the required preset frequency ranges are superimposed to form a digital conversion signal, thereby avoiding interference of signals outside the required frequency range on the digital conversion signal.

[0086] In some embodiments, when the second selection signal is gain amplified according to the corresponding third digital signal through the third automatic gain control unit, the signal output circuit 33 generates a third digital recovery signal according to each third digital signal and the corresponding gain amplification factor, and then outputs a third digital recovery signal as a digital conversion signal, or superimposes multiple third digital recovery signals to obtain a digital conversion signal, wherein the third digital recovery signal is the corresponding third digital signal multiplied by the inverse of the gain amplification factor.

[0087] As an implementation manner, the preset frequency ranges corresponding to all second selection signals are attenuation frequency ranges, so one or more second selection signals are second interference signals, and one or more third digital signals are interference digital signals. Fig.11As shown, the analog-to-digital conversion circuit 300 of this embodiment further includes a fourth analog-to-digital conversion module 34 for converting the analog input signal into a fourth digital signal. The signal output circuit 33 is used to output a digital conversion signal according to the fourth digital signal and one or more third digital signals.

[0088] In this embodiment, the preset frequency ranges corresponding to all second selection signals are attenuation frequency ranges respectively. When one third analog-to-digital conversion module 32 is provided, the signal output circuit 33 can subtract the fourth digital signal from the unique third digital signal to output a digital conversion signal; when multiple third analog-to-digital conversion modules 32 are provided, the signal output circuit 33 can superimpose multiple third digital signals to obtain an interference superposition signal, and then subtract the fourth digital signal from the interference superposition signal to output a digital conversion signal.

[0089] In this embodiment, the fourth digital signal corresponding to the complete analog input signal is subtracted from the superimposed signal of each third digital signal, thereby avoiding the influence of the signal within the interference frequency range on the digital conversion signal.

[0090] In some embodiments, when the second selection signal is gain amplified according to the corresponding third digital signal through the third automatic gain control unit, the signal output circuit 33 generates a third digital recovery signal according to each third digital signal and the corresponding gain amplification factor, superimposes multiple third digital recovery signals to obtain an interference superposition signal, and subtracts the fourth digital signal from the interference superposition signal, wherein the third digital recovery signal is the third digital signal multiplied by the inverse of the gain amplification factor.

[0091] In some embodiments, the fourth analog-to-digital conversion module 34 includes a fourth analog-to-digital conversion unit 341 and a fourth automatic gain control unit 342. The fourth automatic gain control unit 342 is used to control the amplitude of the analog input signal input to the corresponding fourth analog-to-digital conversion module 34 according to the amplitude of the fourth digital signal; the fourth analog-to-digital conversion unit 341 is used to convert the analog input signal into a fourth digital signal.

[0092] In this embodiment, for the fourth analog-to-digital conversion module, the analog input signal is gain-amplified according to the corresponding fourth digital signal through the fourth automatic gain control unit, so that the fourth digital signal can achieve an optimal signal-to-noise ratio, which is further beneficial to improving the signal quality of the analog-to-digital conversion.

[0093] In some embodiments, the signal output circuit 33 can obtain a fourth digital recovery signal based on the fourth digital signal and the corresponding gain amplification factor, and then subtract the fourth digital recovery signal from the interference superposition signal to obtain a digital conversion signal, wherein the fourth digital recovery signal is the fourth digital signal multiplied by the inverse of the gain amplification factor.

[0094] As an implementation manner, the preset frequency range may correspond to a frequency greater than or equal to a lower limit frequency.

[0095] As an implementation manner, the preset frequency range may correspond to being less than or equal to an upper frequency limit.

[0096] As an implementation manner, the preset frequency range may correspond to being greater than or equal to a lower frequency limit and less than or equal to an upper frequency limit.

[0097] As an implementation mode, the second frequency selection circuit 31 may include one or more second frequency selection units, and the plurality of second frequency selection units are respectively arranged in one-to-one correspondence with the plurality of third analog-to-digital conversion modules 32. Different second frequency selection units correspond to different preset frequency ranges, and each second frequency selection unit is used to output a second selection signal corresponding to the preset frequency range.

[0098] In some embodiments, each second frequency selection unit may be an LC circuit (Inductive-Capacitance circuit) formed by an inductor and a capacitor, and the second frequency selection unit may implement a bandpass, low-pass, or high-pass filter function when passing a signal in a preset frequency range. For example, the second frequency selection unit may be a bandpass filter circuit, a low-pass filter circuit, or a high-pass filter circuit.

[0099] As an implementation manner, the third automatic gain control unit 322 may also be implemented as follows: Figures 6 to 8 The implementation methods shown are not described one by one here.

[0100] As an implementation manner, the fourth automatic gain control unit 342 may also be implemented as follows: Figures 6 to 8 The implementation methods shown are not described one by one here.

[0101] An embodiment of the present application provides a chip 400, see Fig.12 As shown, the chip 400 includes the above-mentioned analog-to-digital conversion circuit 100. An integrated circuit (IC) is also called a chip, and the chip can be, but is not limited to, a SOC (System on Chip) chip or a SIP (system in package) chip.

[0102] The chip of this embodiment obtains one or more first digital signals according to an analog input signal through at least one first analog-to-digital conversion module, selects a desired target digital signal or an interference signal to be filtered out from different first digital signals through a first frequency selection circuit, and a signal output circuit outputs a digital conversion signal according to one or more desired target digital signals or interference signals to be filtered out. In the above manner, the desired target digital signal can be retained or the interference signal to be filtered out can be removed, and only signals within the desired frequency range are allowed to generate digital conversion signals, thereby improving the effect of digital signal filtering and reducing the interference of frequency signals outside the desired frequency range.

[0103] An embodiment of the present application provides a chip 500, see Fig.13 As shown, the chip 500 includes the above-mentioned analog-to-digital conversion circuit 300. A chip (Integrated Circuit, IC) is also called a chip, and the chip can be, but is not limited to, a SOC (System on Chip) chip or a SIP (system in package) chip.

[0104] The chip of this embodiment selects the required target analog signal or the interference signal to be filtered out from the analog input signal through the second frequency selection circuit, obtains one or more third digital signals according to the required target analog signal or the interference signal to be filtered out through at least one third analog-to-digital conversion module, and the third digital signal is the required target digital signal or the interference signal to be filtered out. The signal output circuit outputs a digital conversion signal according to the one or more required target digital signals or the interference signal to be filtered out. In the above manner, the required target digital signal can be retained or the interference signal to be filtered out can be removed, and only the signal within the required frequency range is allowed to generate the digital conversion signal, thereby improving the effect of digital signal filtering and reducing the interference of frequency signals outside the required frequency range.

[0105] The present application embodiment also provides an electronic device 600, see Fig.14As shown, the electronic device 600 includes a device body and a chip 400 as described above, which is arranged in the device body. The electronic device can be, but is not limited to, a weight scale, a body fat scale, a nutrition scale, a pulse oximeter, a human body composition analyzer, a display, a USB (Universal Serial Bus) docking station, a car, a smart wearable device, a mobile terminal, and a smart home device. Smart wearable devices include, but are not limited to, smart watches, smart bracelets, and cervical massagers. Mobile terminals include, but are not limited to, smart phones, laptops, tablet computers, and POS (point of sales terminal). Smart home devices include, but are not limited to, smart sockets, smart rice cookers, smart sweepers, and smart lights.

[0106] The electronic device of this embodiment obtains one or more first digital signals according to an analog input signal through at least one first analog-to-digital conversion module, selects a desired target digital signal or an interference signal to be filtered out from different first digital signals through a first frequency selection circuit, and outputs a digital conversion signal according to one or more desired target digital signals or interference signals to be filtered out. In the above manner, the desired target digital signal can be retained or the interference signal to be filtered out can be removed, and only signals within the desired frequency range are allowed to generate digital conversion signals, thereby improving the effect of digital signal filtering and reducing the interference of frequency signals outside the desired frequency range.

[0107] The present application embodiment also provides an electronic device 700, see Fig.15 As shown, the electronic device 700 includes a device body and a chip 500 as described above, which is arranged in the device body. The electronic device can be, but is not limited to, a weight scale, a body fat scale, a nutrition scale, a pulse oximeter, a human body composition analyzer, a display, a USB (Universal Serial Bus) docking station, a car, a smart wearable device, a mobile terminal, and a smart home device. Smart wearable devices include, but are not limited to, smart watches, smart bracelets, and cervical massagers. Mobile terminals include, but are not limited to, smart phones, laptops, tablet computers, and POS (point of sales terminal). Smart home devices include, but are not limited to, smart sockets, smart rice cookers, smart sweepers, and smart lights.

[0108] The electronic device of this embodiment selects the required target analog signal or the interference signal to be filtered out from the analog input signal through the second frequency selection circuit, obtains one or more third digital signals according to the required target analog signal or the interference signal to be filtered out through at least one third analog-to-digital conversion module, and the third digital signal is the required target digital signal or the interference signal to be filtered out. The signal output circuit outputs a digital conversion signal according to the one or more required target digital signals or the interference signal to be filtered out. In the above manner, the required target digital signal can be retained or the interference signal to be filtered out can be removed, and only the signal within the required frequency range is allowed to generate the digital conversion signal, thereby improving the effect of digital signal filtering and reducing the interference of frequency signals outside the required frequency range.

[0109] The above are only preferred embodiments of the present application, and are not intended to limit the present application in any form. Although the present application has been disclosed as above with preferred embodiments, it is not intended to limit the present application. Any technical personnel in the field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present application. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present application without departing from the content of the technical solution of the present application are still within the scope of the technical solution of the present application.

Claims

1. An analog-to-digital conversion circuit, characterized in that: include: One or more first analog-to-digital conversion modules, configured to convert an analog input signal into a first digital signal; A first frequency selection circuit, used for extracting a first selection signal within a preset frequency range corresponding to the first digital signal, wherein different first selection signals correspond to different preset frequency ranges; The signal output circuit is used to output a digital conversion signal according to one or more of the first selection signals.

2. The analog-to-digital conversion circuit according to claim 1, characterized in that: Each of the one or more first analog-to-digital conversion modules comprises a first analog-to-digital conversion unit and a first automatic gain control unit; The first automatic gain control unit is used to control the amplitude of the analog input signal input into the corresponding first analog-to-digital conversion module according to the amplitude of the corresponding first selection signal; The first analog-to-digital conversion unit is used to convert the analog input signal into the first digital signal.

3. The analog-to-digital conversion circuit according to claim 1 or 2, characterized in that: The preset frequency ranges corresponding to all the first selection signals are respectively passing frequency ranges; one or more of the first selection signals are respectively target digital signals; The signal output circuit is used to output the digital conversion signal according to one or more target digital signals.

4. The analog-to-digital conversion circuit according to claim 1 or 2, characterized in that: The preset frequency ranges corresponding to all the first selection signals are attenuation frequency ranges; one or more of the first selection signals are first interference signals; The analog-to-digital conversion circuit further includes a second analog-to-digital conversion module, configured to convert the analog input signal into a second digital signal; The signal output circuit is used to output the digital conversion signal according to the second digital signal and one or more of the first interference signals.

5. The analog-to-digital conversion circuit according to claim 4, characterized in that: The second analog-to-digital conversion module includes a second analog-to-digital conversion unit and a second automatic gain control unit; The second automatic gain control unit is used to control the amplitude of the analog input signal input into the corresponding second analog-to-digital conversion module according to the amplitude of the second digital signal; The second analog-to-digital conversion unit is used to convert the analog input signal into the second digital signal.

6. An analog-to-digital conversion circuit, characterized in that: include: A second frequency selection circuit, used for extracting second selection signals within one or more preset frequency ranges from the analog input signal, wherein different second selection signals correspond to different preset frequency ranges; One or more third analog-to-digital conversion modules, configured to convert the corresponding second selection signal into a third digital signal; The signal output circuit is used to output a digital conversion signal according to one or more of the third digital signals.

7. The analog-to-digital conversion circuit according to claim 6, characterized in that: Each of the one or more third analog-to-digital conversion modules comprises a third analog-to-digital conversion unit and a third automatic gain control unit; The third automatic gain control unit is used to control the amplitude of the second selection signal input to the corresponding third analog-to-digital conversion module according to the amplitude of the corresponding third digital signal; The third analog-to-digital conversion unit is used to convert the corresponding second selection signal into the third digital signal.

8. The analog-to-digital conversion circuit according to claim 6 or 7, characterized in that: The preset frequency ranges corresponding to all the second selection signals are respectively passing frequency ranges; one or more of the second selection signals are respectively target analog signals; The signal output circuit is used to output the digital conversion signal according to one or more of the third digital signals.

9. The analog-to-digital conversion circuit according to claim 6 or 7, characterized in that: The preset frequency ranges corresponding to all the second selection signals are respectively attenuation frequency ranges; one or more of the second selection signals are respectively second interference signals; The analog-to-digital conversion circuit further includes a fourth analog-to-digital conversion module, configured to convert the analog input signal into a fourth digital signal; The signal output circuit is used to output the digital conversion signal according to the fourth digital signal and one or more of the third digital signals.

10. The analog-to-digital conversion circuit according to claim 9, characterized in that: The fourth analog-to-digital conversion module includes a fourth analog-to-digital conversion unit and a fourth automatic gain control unit; The fourth automatic gain control unit is used to control the amplitude of the analog input signal input to the corresponding fourth analog-to-digital conversion module according to the amplitude of the fourth digital signal; The fourth analog-to-digital conversion unit is used to convert the analog input signal into the fourth digital signal.

11. A chip, characterized in that: The chip includes the analog-to-digital conversion circuit according to any one of claims 1 to 5 or the analog-to-digital conversion circuit according to any one of claims 6 to 10.

12. An electronic device, characterized in that: The electronic device comprises the chip according to claim 11.

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