Sine wave frequency product-based AND logic circuit and control method thereof

Abstract

The invention discloses an AND logic circuit based on sine wave frequency product and a control method thereof.The circuit comprises a multiplier, a low-pass filter, a high-pass filter and a logic judgment unit, the first input end of the multiplier is used for inputting a first sine wave signal A, and the second input end of the multiplier is used for inputting a second sine wave signal B; the first sine wave signal A and the second sine wave signal B are sine wave signals with different frequencies, the output end of the multiplier is respectively connected with the input ends of the low-pass filter and the high-pass filter, and the output ends of the low-pass filter and the high-pass filter are respectively connected with the input end of the logic judgment unit. According to the method, a sine wave frequency product detection mechanism is introduced, the sum frequency and the difference frequency between two sine signals are measured and analyzed, the signal state is verified, and the anti-interference capability and the safety in the logic operation process are remarkably enhanced.

Description

Technical Field

[0001] The present invention belongs to the technical field of logic circuit design, and particularly relates to an AND logic circuit based on the product of sine wave frequencies and a control method therefor. Background Art

[0002] The AND logic unit is an indispensable basic building block in digital logic design and applications, and is widely used in integrated circuits, computer systems, and various digital signal processing devices. The function of AND logic is to determine whether to generate a specific output signal by judging the states of input signals. The traditional design of AND logic units is mainly based on the basic cell library of integrated circuits, and the AND gate circuit under the CMOS process is one of the most common implementation forms. The traditional CMOS AND gate circuit realizes the AND logic function through the cooperation of the pull-up and pull-down networks and inverters. However, in the existing integrated circuit design, the implementation of AND logic usually relies on the AND gate circuit of the basic cell. Although these traditional AND gates have the advantages of simple structure, fast response, and low power consumption, they show obvious limitations when facing application scenarios with high safety standards. Especially in key fields such as rail transit, aerospace, and medical equipment, the safety and reliability of the system are crucial. Due to their inherent physical characteristics, traditional AND gates may cause misflips or failures of logical states due to factors such as electromagnetic interference, temperature changes, or power supply fluctuations, thereby affecting the correctness and stability of signal transmission. In addition, in the board-level design, although AND gate solutions based on transformers have been developed to enhance the anti-interference ability of the system, such solutions have the defects of being difficult to miniaturize and integrate, and therefore cannot be applied to the field of modern integrated circuit design. Summary of the Invention

[0003] To solve the above problems, the present invention provides an AND logic circuit based on the product of sine wave frequencies and a control method therefor, so as to solve the problem that the traditional AND logic gate circuit is easily affected by factors such as electromagnetic interference, temperature changes, or power supply fluctuations, resulting in misflips or failures of logical states, thereby affecting the correctness and stability of signal transmission.

[0004] An AND logic circuit based on the product of sine wave frequencies includes: a multiplier, a low-pass filter, a high-pass filter, and a logic judgment unit; The first input end of the multiplier is used to input a first sine wave signal A, and the second input end of the multiplier is used to input a second sine wave signal B. The first sine wave signal A and the second sine wave signal B are sine wave signals with different frequencies; The output end of the multiplier is respectively connected to the input ends of the low-pass filter and the high-pass filter, and the output ends of the low-pass filter and the high-pass filter are respectively connected to the input ends of the logic judgment unit.

[0005] According to a specific embodiment of the present invention, the first input terminal and the second input terminal of the multiplier are respectively connected to a first signal source and a second signal source.

[0006] A signal state detection chip based on the product of sine wave frequencies includes the AND logic circuit based on the product of sine wave frequencies described above.

[0007] A signal state detection product based on the product of sine wave frequencies includes the signal state detection chip based on the product of sine wave frequencies described above.

[0008] A method for AND logic control based on the product of sine wave frequencies, which is applied to the AND logic circuit based on the product of sine wave frequencies described above, includes: Obtain the first sine wave signal A and the second sine wave signal B in real time; Input the first sine wave signal A and the second sine wave signal B into the multiplier respectively to generate an intermediate node signal C; Input the intermediate node signal C into a low-pass filter and a high-pass filter respectively for filtering processing, and extract the difference frequency signal OUT0 and the sum frequency signal OUT1 correspondingly; Perform spectrum analysis on the difference frequency signal OUT0 and the sum frequency signal OUT1 respectively, and judge the signal states of the difference frequency signal OUT0 and the sum frequency signal OUT1 based on the spectrum analysis results; Perform an AND logic operation based on the signal states of the difference frequency signal OUT0 and the sum frequency signal OUT1, and output the logic operation result.

[0009] According to a specific embodiment of the present invention, performing spectrum analysis on the difference frequency signal OUT0 and the sum frequency signal OUT1 respectively, and judging the signal states of the difference frequency signal OUT0 and the sum frequency signal OUT1 based on the spectrum analysis results includes: Perform spectrum analysis on the difference frequency signal OUT0 and the sum frequency signal OUT1 respectively to obtain the frequency characteristics of the difference frequency signal OUT0 and the sum frequency signal OUT1 correspondingly; Judge the signal state of the difference frequency signal OUT0 based on the frequency characteristics of the difference frequency signal OUT0, and judge the signal state of the sum frequency signal OUT1 based on the frequency characteristics of the sum frequency signal OUT1.

[0010] According to a specific embodiment of the present invention, judging the signal state of the difference frequency signal OUT0 based on the frequency characteristics of the difference frequency signal OUT0, and judging the signal state of the sum frequency signal OUT1 based on the frequency characteristics of the sum frequency signal OUT1 further includes: Judge whether the difference frequency signal OUT0 meets the preset difference frequency threshold standard based on the frequency characteristics of the difference frequency signal OUT0. If it meets, the signal state of the difference frequency signal OUT0 is normal; otherwise, the signal state of the difference frequency signal OUT0 is abnormal; Based on the frequency characteristics of the sum - frequency signal OUT1, determine whether the sum - frequency signal OUT1 meets the preset sum - frequency threshold standard. If it meets the standard, the signal state of the sum - frequency signal OUT1 is normal; otherwise, the signal state of the sum - frequency signal OUT1 is abnormal.

[0011] According to a specific embodiment of the present invention, performing an AND logic operation based on the signal states of the difference - frequency signal OUT0 and the sum - frequency signal OUT1, and outputting the result of the logic operation further includes: Performing an AND logic operation based on the signal states of the difference - frequency signal OUT0 and the sum - frequency signal OUT1. When and only when the signal states of both the difference - frequency signal OUT0 and the sum - frequency signal OUT1 are in the normal state, the output logic operation result is 1; otherwise, the output logic operation result is 0.

[0012] According to a specific embodiment of the present invention, the first sine - wave signal A and the second sine - wave signal B are sine - wave signals with different frequencies.

[0013] According to a specific embodiment of the present invention, the method further includes: generating the first sine - wave signal A based on the first signal source, and generating the second sine - wave signal B based on the second signal source.

[0014] Compared with the prior art, a kind of AND logic circuit based on the product of sine - wave frequencies and its control method provided by the present invention has the following advantages: 1. The present invention introduces a sine - wave frequency - product detection mechanism. By measuring and analyzing the sum - frequency and difference - frequency between two sine signals, it realizes the effective identification and verification of the signal source identity. Compared with the traditional AND - gate circuit, the present invention can effectively prevent the activation of the lower - level circuit when the input signal is abnormal, significantly enhancing the anti - interference ability and security during the logic operation process. Even in a highly interfering environment, the present invention can ensure the correct transmission of data signals, thus avoiding system insecurity caused by abnormal input signals. This mechanism provides a solid physical basis for the security and reliability of the system, especially suitable for application scenarios with extremely high requirements for security.

[0015] 2. The circuit structure of the present invention is not only simple and efficient. By real - time monitoring and evaluating the frequency characteristics of the signal, it replaces the traditional static - level voltage detection method, changing the traditional static operating voltage detection to dynamic frequency detection, thus avoiding the risk of abnormal static operating voltage lock - up caused by circuit short - circuit or open - circuit.

[0016] 3. The present invention also has good integratability and compatibility, is easy to be integrated into chip design and extended to existing electronic systems, can flexibly adapt to the upgrade requirements of existing electronic systems, and provides a new solution for realizing a higher - level AND logic operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] To more clearly illustrate the technical solutions in the embodiments of the present disclosure or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present disclosure. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0018] Figure 1 is a AND logic circuit diagram based on the product of sine wave frequencies according to an embodiment of the present invention.

[0019] Figure 2 is a structural diagram of a traditional AND gate logic circuit according to an embodiment of the present invention.

[0020] Figure 3 is a flowchart of a control method for an AND logic circuit based on the product of sine wave frequencies according to an embodiment of the present invention.

[0021] Figure 4 is a flowchart of a method for judging the state of an output signal based on spectrum analysis according to an embodiment of the present invention.

[0022] Figure 5 is a flowchart of a method for judging the state of an output signal based on the frequency characteristics of the output signal according to an embodiment of the present invention.

[0023] Figure 6 is a waveform diagram of an input signal and an output signal under normal conditions according to an embodiment of the present invention.

[0024] Figure 7 is a spectrum analysis diagram of an input signal and an output signal under normal conditions according to an embodiment of the present invention.

[0025] Figure 8 is a waveform diagram of an input signal and an output signal under abnormal conditions according to an embodiment of the present invention.

[0026] Figure 9 is a spectrum analysis diagram of an input signal and an output signal under abnormal conditions according to an embodiment of the present invention.

[0027] Figure 10 is a waveform diagram of an output signal under normal conditions according to an embodiment of the present invention.

[0028] Figure 11 is a spectrum diagram of an output signal under normal conditions according to an embodiment of the present invention.

[0029] Figure 12 is a waveform diagram of an output signal under abnormal conditions according to an embodiment of the present invention.

[0030] Figure 13 It is a spectrogram of the abnormal situation output signal provided according to an embodiment of the present invention.

[0031] Reference numerals: 01 - Multiplier; 02 - Low - pass filter; 03 - High - pass filter; 04 - Logic judgment unit. Detailed implementation manners

[0032] In order to enable those skilled in the art to more clearly understand the concepts and ideas of the present invention, the present invention will be described in detail below in combination with specific embodiments. It should be understood that the embodiments given herein are only a part of all possible embodiments of the present invention. After reading the specification of this application, those skilled in the art are capable of making improvements, modifications, or substitutions to part or the whole of the following embodiments, and these improvements, modifications, or substitutions are also included within the scope of protection required by the present invention.

[0033] In this article, terms such as "first", "second" and other similar terms do not imply any order, quantity, or importance, but are only used to distinguish different elements. In this article, terms such as "a", "an" and other similar terms do not mean that there is only one thing, but mean that the relevant description only refers to one of the things, and the thing may have one or more. In this article, terms such as "comprise", "include" and other similar terms are intended to represent a logical relationship and should not be regarded as representing a spatial structure relationship. For example, "A includes B" is intended to mean that logically B belongs to A, rather than meaning that B is located inside A in terms of space. Additionally, the meanings of terms such as "comprise", "include" and other similar terms should be regarded as open - ended rather than closed. For example, "A includes B" is intended to mean that B belongs to A, but B does not necessarily constitute the whole of A, and A may also include other elements such as C, D, E, etc.

[0034] In this article, terms such as "embodiment", "the present embodiment", "an embodiment", "one embodiment" do not mean that the relevant description only applies to a specific embodiment, but mean that these descriptions may also apply to one or more other embodiments. Those skilled in the art should understand that in this article, any description made for a certain embodiment can be substituted, combined, or otherwise combined with the relevant descriptions in one or more other embodiments, and the new embodiments generated by substitution, combination, or other means of combination are easily conceivable by those skilled in the art and fall within the scope of protection of the present invention.

[0035] Embodiment 1 Additional aspects and advantages of the implementation manners of the present invention will be given in part in the following description, will become apparent in part from the following description, or will be understood through the practice of the implementation manners of the present invention. In combination with Figure 1, an embodiment of the present invention provides a logical AND circuit based on the product of sine wave frequencies, including: A multiplier 01, a low-pass filter 02, a high-pass filter 03, and a logic judgment unit 04. The first input terminal and the second input terminal of the multiplier 01 are respectively connected to a first signal source and a second signal source. The first input terminal of the multiplier 01 is used to input a first sine wave signal A, and the second input terminal of the multiplier 01 is used to input a second sine wave signal B. The first sine wave signal A and the second sine wave signal B are sine wave signals with different frequencies. The output terminal of the multiplier 01 is respectively connected to the input terminals of the low-pass filter 02 and the high-pass filter 03. The output terminals of the low-pass filter 02 and the high-pass filter 03 are respectively connected to the input terminals of the logic judgment unit 04.

[0036] In the embodiment of the present invention, the first sine wave signal A is generated by the first signal source, and the second sine wave signal B is generated by the second signal source. The multiplier 01 is used to multiply the first sine wave signal A and the second sine wave signal B, and output an intermediate node signal C. The intermediate node signal C contains the sum frequency and difference frequency components of the first sine wave signal A and the second sine wave signal B. Subsequently, the intermediate node signal C is respectively input into the low-pass filter 02 and the high-pass filter 03. The difference frequency component in the intermediate node signal C is filtered out by the low-pass filter 02, and the difference frequency signal OUT0 is output. The sum frequency component in the intermediate node signal C is filtered out by the high-pass filter 03, and the sum frequency signal OUT1 is output. The output difference frequency signal OUT0 and the sum frequency signal OUT1 are respectively input into the logic judgment unit 04 for logical AND operation. When and only when both output signals are in an effective state, the logic judgment unit 04 outputs logic '1', indicating that the logical AND condition is satisfied. Conversely, if any one of the signals fails to reach the effective threshold standard, the logic judgment unit 04 will output logic '0', indicating that the logical AND condition is not triggered.

[0037] Such as Figure 2The traditional CMOS AND gate circuit structure shown is composed of two cascaded circuits: the first stage is a NAND gate composed of four MOS transistors, and the second stage is an inverter composed of two MOS transistors. The traditional CMOS AND gate circuit realizes the AND logic function through the cooperation of the pull-up and pull-down networks and the inverter. In the traditional AND gate logic circuit, when any one of the input signals A and B appears abnormal, the output intermediate node signal C may directly drive the downstream circuit, and fail to effectively identify and transmit the abnormal state of signal B. If both signal A and signal B are interfered with or malfunction, an uncontrollable signal data C will be output, so it is not suitable for application scenarios with high safety requirements. In the AND logic circuit based on the product of sine wave frequencies provided by the present invention, based on the product processing of sine wave frequencies, by detecting the difference frequency and sum frequency of sine waves, and performing AND logic operations through a logic judgment unit, the anti-interference ability and safety in the logic operation process are significantly enhanced. Even in a highly interfering environment, the present invention can ensure the correct transmission of data signals and effectively avoid logic errors caused by interference. In addition, the present invention not only inherits the advantages of the traditional AND gate structure being simple and easy to implement, but also has good integratability and compatibility, is easy to integrate into chip design and expand to existing electronic systems, providing a new solution for realizing a higher level of AND logic operation.

[0038] Embodiment 2 Based on the AND logic circuit based on the product of sine wave frequencies provided in Embodiment 1, the embodiment of the present invention also provides a control method for the AND logic circuit based on the product of sine wave frequencies, as Figures 3 - 13 shown, including: S1: Obtain the first sine wave signal A and the second sine wave signal B in real time.

[0039] S2: Input the first sine wave signal A and the second sine wave signal B into a multiplier respectively to generate an intermediate node signal C.

[0040] S3: Input the intermediate node signal C into a low-pass filter and a high-pass filter respectively for filtering processing, and extract the difference frequency signal OUT0 and the sum frequency signal OUT1 correspondingly.

[0041] S4: Perform spectrum analysis on the difference frequency signal OUT0 and the sum frequency signal OUT1 respectively, and judge the signal states of the difference frequency signal OUT0 and the sum frequency signal OUT1 based on the spectrum analysis results.

[0042] S5: Perform AND logic operations based on the signal states of the difference frequency signal OUT0 and the sum frequency signal OUT1, and output the logic operation result.

[0043] In an embodiment of the present invention, before obtaining the first sine wave signal A and the second sine wave signal B, it further includes generating the first sine wave signal A based on a first signal source and generating the second sine wave signal B based on a second signal source. The first sine wave signal A and the second sine wave signal B are sine wave signals with different frequencies, and the phase relationship between the first sine wave signal A and the second sine wave signal B changes continuously over time. Then, the first sine wave signal A and the second sine wave signal B are input into a multiplier 01 for multiplication processing to generate an intermediate node signal C. The intermediate node signal C contains the sum frequency and difference frequency components of the first sine wave signal A and the second sine wave signal B. Subsequently, the intermediate node signal C is respectively input into a low-pass filter 02 and a high-pass filter 03. The difference frequency component in the intermediate node signal C is filtered out by the low-pass filter 02 to output a difference frequency signal OUT0, and the sum frequency component in the intermediate node signal C is filtered out by the high-pass filter 03 to output a sum frequency signal OUT1. By monitoring the signal states of the output difference frequency signal OUT0 and sum frequency signal OUT1 in real time and performing an AND logic operation according to the signal states, a final logic operation result is output. Compared with the traditional AND logic circuit, the present invention significantly enhances the anti-interference ability and security in the logic operation process by introducing a sine wave difference frequency and sum frequency detection mechanism. Even in a highly interfering environment, this solution can ensure the correct transmission of data signals and effectively avoid logic errors caused by interference.

[0044] Specifically, step S4 performs spectral analysis on the difference frequency signal OUT0 and the sum frequency signal OUT1 respectively, and determining the signal states of the difference frequency signal OUT0 and the sum frequency signal OUT1 based on the spectral analysis results includes: S41: Perform spectral analysis on the difference frequency signal OUT0 and the sum frequency signal OUT1 respectively to obtain the frequency characteristics of the difference frequency signal OUT0 and the sum frequency signal OUT1 correspondingly.

[0045] S42: Determine the signal state of the difference frequency signal OUT0 based on the frequency characteristics of the difference frequency signal OUT0, and determine the signal state of the sum frequency signal OUT1 based on the frequency characteristics of the sum frequency signal OUT1. Further includes: S421: Determine whether the difference frequency signal OUT0 meets a preset difference frequency threshold standard based on the frequency characteristics of the difference frequency signal OUT0. If it meets, the signal state of the difference frequency signal OUT0 is normal; otherwise, the signal state of the difference frequency signal OUT0 is abnormal.

[0046] S422: Determine whether the sum frequency signal OUT1 meets a preset sum frequency threshold standard based on the frequency characteristics of the sum frequency signal OUT1. If it meets, the signal state of the sum frequency signal OUT1 is normal; otherwise, the signal state of the sum frequency signal OUT1 is abnormal.

[0047] In the embodiments of the present invention, by simulating the input signals in the normal working state and the input signals in the abnormal working state, the output signals in the normal working state and the output signals in the abnormal working state are correspondingly obtained. By analyzing the frequency characteristics of the output signals in the normal working state and the output signals in the abnormal working state, the signal states of the output signals in the normal working state and the abnormal working state are judged.

[0048] In the normal working state, the first sine wave signal A and the second sine wave signal B are sine waves with different frequencies respectively, and the frequency difference between them is not large. The output waveform in the normal working state is as Figure 6 shown. The intermediate node signal C is the product of the first sine wave signal A and the second sine wave signal B, showing a periodic change as a whole. The frequency spectrum analysis is respectively performed on the first sine wave signal A, the second sine wave signal B, and the intermediate node signal C. As Figure 7 shown, the first sine wave signal A and the second sine wave signal B are periodic sine waves, which show single pulses in the frequency spectrum. When these two sine wave signals with different frequencies pass through the multiplier, the output intermediate node signal C contains the sum frequency and difference frequency components of the first sine wave signal A and the second sine wave signal B. Therefore, in the frequency spectrum, the intermediate node signal C shows two pulses, corresponding to the frequency difference value and the frequency sum value respectively.

[0049] In the abnormal working state, it is assumed that the first sine wave signal A is a normal sine wave signal, while the second sine wave signal B is abnormal, showing a continuous constant high level. The output waveform in the abnormal working state is as Figure 8 shown. At this time, the intermediate node signal C output by the multiplier shows the same waveform characteristics as the first sine wave signal A. If the second sine wave signal B shows a continuous constant low level, the intermediate node signal C will always remain low level at this time, which will not cause misjudgment of the subsequent circuit. Therefore, it will not be discussed in detail here. The frequency spectrum analysis is respectively performed on the first sine wave signal A, the second sine wave signal B, and the intermediate node signal C. The frequency spectrum analysis diagram is as Figure 9 shown. Since the second sine wave signal B is in a constant high level state, the frequency spectrum analysis result shows that the frequency component is almost zero or shows a very low noise level. The waveforms of the first sine wave signal A and the intermediate node signal C are the same, showing the same frequency spectrum characteristics, mainly concentrated at the fundamental frequency of signal A, and this fundamental frequency is not within the preset difference frequency and sum frequency ranges. Although the intermediate node signal C in the abnormal working state has the same waveform as signal A, its frequency spectrum characteristics have changed significantly. This change in frequency spectrum characteristics provides an important basis for judgment for subsequent frequency detection.

[0050] Figures 10 - 13The waveforms and spectra of the difference frequency signal OUT0 and the sum frequency signal OUT1 output after the intermediate node signal C is processed by a high-pass filter or a low-pass filter are compared in the normal working state and the abnormal working state. In the normal working state, the difference frequency and sum frequency of the two input sine wave signals are relatively stable. After being processed by the high-pass filter or the low-pass filter, only one obvious peak is shown in the spectrum of the output difference frequency signal OUT0 or sum frequency signal OUT1, indicating that only the signals near the preset frequency are filtered out. When any input signal fails, the system enters the abnormal working state. At this time, the frequency difference of the input signals increases significantly, resulting in the lack of the preset frequency components in the intermediate node signal C, so that an effective signal cannot be obtained through the filter. The amplitude of the filtered output signal in the abnormal state is significantly lower, only one-tenth or even lower of the amplitude of the normal filtered output signal. This significant amplitude attenuation causes the signal to fail to reach the minimum threshold condition required to trigger the next-stage circuit, so the output response of the subsequent circuit cannot be effectively activated or driven. Based on this frequency characteristic, the present invention uses whether the preset frequency of the detected output signal exists as the judgment criterion for whether the output signal is normal, and can also be used as the judgment criterion for whether the input signal is normal.

[0051] Specifically, step S5 performs an AND logic operation based on the signal states of the difference frequency signal OUT0 and the sum frequency signal OUT1, and the output of the logic operation result further includes: Perform an AND logic operation based on the signal states of the difference frequency signal OUT0 and the sum frequency signal OUT1. When and only when the signal states of both the difference frequency signal OUT0 and the sum frequency signal OUT1 are in the normal state, the output logic operation result is 1; otherwise, the output logic operation result is 0.

[0052] The AND logic operation is to determine whether to generate a specific output signal by judging the states of the input signals. Specifically, for a two-input digital AND logic unit, the output signal is high level only when both input signals are high level (logic '1'); otherwise, as long as any one of the input signals is low level (logic '0'), the output signal is low level. Based on this basic principle, in the embodiment of the present invention, the difference frequency signal OUT0 and the sum frequency signal OUT1 are used as the two input signals of the AND logic operation. When and only when the signal states of both the difference frequency signal OUT0 and the sum frequency signal OUT1 are in the normal state (i.e., logic '1'), the output logic operation result is 1, indicating that the AND logic condition is satisfied. If the state of any one of the difference frequency signal OUT0 and the sum frequency signal OUT1 is abnormal, the output logic operation result is 0, indicating that the AND logic condition is not triggered. Only when the logic operation result is 1 can the next-stage circuit be driven.

[0053] In a specific embodiment of the present invention, the AND logic operation can be extended to multiple inputs. The output of the logic operation is 1 if and only if all input signals are in a normal state, otherwise the output is 0.

[0054] Embodiment 3 Based on the AND logic circuit based on the product of sine wave frequencies provided in Embodiment 1, the embodiment of the present invention further provides a signal status detection chip based on the product of sine wave frequencies, including the above-mentioned AND logic circuit based on the product of sine wave frequencies.

[0055] Furthermore, the embodiment of the present invention also provides a signal status detection product based on the product of sine wave frequencies, including the above-mentioned signal status detection chip based on the product of sine wave frequencies.

[0056] In summary, the AND logic circuit based on the product of sine wave frequencies and its control method provided by the present invention have the following advantages: 1. The present invention introduces a sine wave frequency product detection mechanism. By measuring and analyzing the sum frequency and difference frequency between two sine signals, it realizes the effective identification and verification of the signal source identity. Compared with the traditional AND gate circuit, the present invention can effectively prevent the activation of the lower-level circuit when the input signal is abnormal, significantly enhancing the anti-interference ability and security during the logic operation process. Even in a highly interfering environment, the present invention can ensure the correct transmission of data signals, thus avoiding system insecurity caused by abnormal input signals. This mechanism provides a solid physical basis for the security and reliability of the system, especially suitable for application scenarios with extremely high requirements for security.

[0057] 2. The circuit structure of the present invention is not only simple and efficient. By real-time monitoring and evaluating the frequency characteristics of the signal, it replaces the traditional static level voltage detection method, transforming the traditional static operating voltage detection into dynamic frequency detection, thus avoiding the risk of abnormal locking of the static operating voltage caused by circuit short circuit or open circuit.

[0058] 3. The present invention also has good integratability and compatibility, is easy to integrate into chip design and expand to existing electronic systems, and can flexibly adapt to the upgrade requirements of existing electronic systems, providing a new solution for achieving a higher level of AND logic operation.

[0059] The concept, principle and idea of the present invention have been described in detail above in combination with specific embodiments (including examples and instances). Those skilled in the art should understand that the embodiments of the present invention are not limited to the several forms given above. After reading the present application document, those skilled in the art may make any possible improvements, substitutions and equivalent forms to the steps, methods, systems and components in the above embodiments, and these improvements, substitutions and equivalent forms should be regarded as falling within the scope of the present invention. The protection scope of the present invention is only subject to the claims.

Claims

1. An AND logic circuit based on sine wave frequency product, characterized in that: include: Multiplier, low-pass filter, high-pass filter and logic judgment unit; The first input terminal of the multiplier is used to input a first sinusoidal wave signal A, and the second input terminal of the multiplier is used to input a second sinusoidal wave signal B, wherein the first sinusoidal wave signal A and the second sinusoidal wave signal B are sinusoidal wave signals of different frequencies; The output end of the multiplier is connected to the input end of the low-pass filter and the high-pass filter respectively, and the output end of the low-pass filter and the high-pass filter is connected to the input end of the logic judgment unit respectively.

2. The AND logic circuit based on sine wave frequency product according to claim 1, characterized in that: The first input terminal and the second input terminal of the multiplier are connected to the first signal source and the second signal source respectively.

3. A signal state detection chip based on sine wave frequency product, characterized in that: It comprises the AND logic circuit based on the sine wave frequency product as claimed in claim 1.

4. A signal state detection product based on sine wave frequency product, characterized in that: It comprises the signal state detection chip based on sine wave frequency product as claimed in claim 3.

5. A method for controlling AND logic based on sine wave frequency product, the method being applied to the AND logic circuit based on sine wave frequency product according to claim 1, characterized in that: include: Acquire a first sine wave signal A and a second sine wave signal B in real time; Inputting the first sine wave signal A and the second sine wave signal B into a multiplier respectively to generate an intermediate node signal C; The intermediate node signal C is input into a low-pass filter and a high-pass filter for filtering, respectively, and a difference frequency signal OUT0 and a sum frequency signal OUT1 are extracted accordingly; Performing spectrum analysis on the difference frequency signal OUT0 and the sum frequency signal OUT1 respectively, and judging the signal states of the difference frequency signal OUT0 and the sum frequency signal OUT1 based on the spectrum analysis results; An AND logic operation is performed based on the signal states of the difference frequency signal OUT0 and the sum frequency signal OUT1 , and a logic operation result is output.

6. The AND logic control method based on sinusoidal wave frequency product according to claim 5, characterized in that: The performing spectrum analysis on the difference frequency signal OUT0 and the sum frequency signal OUT1 respectively, and judging the signal states of the difference frequency signal OUT0 and the sum frequency signal OUT1 based on the spectrum analysis results comprises: Performing spectrum analysis on the difference frequency signal OUT0 and the sum frequency signal OUT1 respectively, and obtaining frequency characteristics of the difference frequency signal OUT0 and the sum frequency signal OUT1 accordingly; The signal state of the difference frequency signal OUT0 is determined based on the frequency characteristic of the difference frequency signal OUT0 , and the signal state of the sum frequency signal OUT1 is determined based on the frequency characteristic of the sum frequency signal OUT1 .

7. The AND logic control method based on sinusoidal wave frequency product according to claim 6, characterized in that: The determining the signal state of the difference frequency signal OUT0 based on the frequency characteristic of the difference frequency signal OUT0, and determining the signal state of the sum frequency signal OUT1 based on the frequency characteristic of the sum frequency signal OUT1 further comprises: Determine whether the difference frequency signal OUT0 meets a preset difference frequency threshold standard based on the frequency characteristic of the difference frequency signal OUT0, if so, the signal state of the difference frequency signal OUT0 is normal, otherwise, the signal state of the difference frequency signal OUT0 is abnormal; Based on the frequency characteristic of the sum frequency signal OUT1, it is determined whether the sum frequency signal OUT1 meets a preset sum frequency threshold standard. If so, the signal state of the sum frequency signal OUT1 is normal; otherwise, the signal state of the sum frequency signal OUT1 is abnormal.

8. The AND logic control method based on sinusoidal wave frequency product according to claim 7, characterized in that: The performing an AND logic operation based on the signal states of the difference frequency signal OUT0 and the sum frequency signal OUT1 and outputting the logic operation result further comprises: An AND logic operation is performed based on the signal states of the difference frequency signal OUT0 and the sum frequency signal OUT1. If and only if the signal states of the difference frequency signal OUT0 and the sum frequency signal OUT1 are both normal, the output logic operation result is 1; otherwise, the output logic operation result is 0.

9. The AND logic control method based on sinusoidal wave frequency product according to claim 5, characterized in that: The first sinusoidal wave signal A and the second sinusoidal wave signal B are sinusoidal wave signals with different frequencies.

10. The AND logic control method based on sinusoidal wave frequency product according to claim 5, characterized in that: The method further includes generating a first sinusoidal wave signal A based on a first signal source, and generating a second sinusoidal wave signal B based on a second signal source.

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