Signal folding circuit and electronic equipment

Abstract

The invention provides a signal folding circuit and electronic equipment, and relates to the technical field of circuits. The signal folding circuit is used for receiving an input signal and outputting an output signal, and the input signal and the output signal are analog signals. The signal folding circuit comprises a dynamic threshold selection circuit and an operational circuit, the dynamic threshold selection circuit is used for outputting a first reference voltage and a second reference voltage according to the first control signal, and the first reference voltage is greater than the second reference voltage; the operation circuit is used for outputting an output signal according to the input signal, the first reference voltage and the second reference voltage, the output signal is equal to the input signal minus or plus integral multiples of the difference between the first reference voltage and the second reference voltage, and the voltage value of the output signal is smaller than or equal to the first reference voltage; the voltage value of the output signal is greater than or equal to the second reference voltage; the first control signal is output by the operational circuit according to the output signal. The signal folding circuit is used for solving the problem that the dynamic range of input signals is large.

Description

Technical Field

[0001] This application relates to the field of circuit technologies, and particularly to a signal folding circuit and an electronic device. Background Art

[0002] An analog-to-digital converter (ADC) connects a real analog signal to a digital processor, so that the signal can be efficiently processed by the digital processor. The key parameters of this conversion are the sampling rate and the dynamic range. For the dynamic range, in theory, it is necessary to ensure that the dynamic range of the input signal is less than the dynamic range of the ADC during the conversion to ensure signal quality.

[0003] However, in some actual application scenarios, it often occurs that the dynamic range of a single signal is large and exceeds the sampling dynamic range of the ADC. For example, please refer to Figure 1 , when the input signal exceeds the dynamic range of the ADC, the ADC can only sample within the dynamic range to obtain a sampled signal, resulting in the output signal obtained from the sampled signal being clipped at the top and bottom, causing signal distortion and a decrease in the error vector magnitude (EVM). In some other application scenarios, two signals are received simultaneously. The large signal has a large dynamic range, and the small signal has a small dynamic range. The superposition of the large and small dynamics exceeds the dynamic range of the receiver, which also causes signal distortion.

[0004] Therefore, the limitation of the dynamics of large and small signals is an urgent problem to be solved. Summary of the Invention

[0005] Embodiments of this application provide a signal folding circuit and an electronic device to solve the problem of high power consumption when processing a large dynamic range.

[0006] To achieve the above object, the embodiments of this application adopt the following technical solutions:

[0007] In a first aspect, an embodiment of this application provides a signal folding circuit, which is configured to receive an input signal and output an output signal, where the input signal and the output signal are analog signals. The signal folding circuit includes a dynamic threshold selection circuit and an arithmetic circuit. The dynamic threshold selection circuit is configured to output a first reference voltage and a second reference voltage according to a first control signal, where the first reference voltage is greater than the second reference voltage. The arithmetic circuit is configured to output an output signal according to the input signal, the first reference voltage, and the second reference voltage. The output signal is equal to the input signal minus or plus an integer multiple of the difference between the first reference voltage and the second reference voltage, and the voltage value of the output signal is less than or equal to the first reference voltage, and the voltage value of the output signal is greater than or equal to the second reference voltage. Among them, the first control signal is output by the arithmetic circuit according to the output signal.

[0008] In this way, the magnitudes of the first reference voltage and the second reference voltage can be dynamically controlled by the first control signal, thereby reducing the dynamic range of the signal folding circuit, and thus reducing the power consumption of the signal folding circuit and the system where it is located.

[0009] In a possible implementation manner of the first aspect, within the first unit time period, when the output signal is equal to the input signal, the first control signal output by the arithmetic circuit reduces the difference between the first reference voltage and the second reference voltage output by the dynamic threshold selection circuit.

[0010] In a possible implementation manner of the first aspect, when the output signal is equal to the input signal minus or plus 1 times or more of the difference between the first reference voltage and the second reference voltage, the first control signal output increases the difference between the first reference voltage and the second reference voltage output by the dynamic threshold selection circuit.

[0011] In a possible implementation manner of the first aspect, the arithmetic circuit includes: a comparator module for comparing the input signal with the first reference voltage and outputting a first comparison result, and comparing the input signal with the second reference voltage and outputting a second comparison result; a feedback voltage generation circuit for outputting a voltage signal according to the first comparison result and / or the second comparison result, and the absolute value of the voltage signal is an integer multiple of the difference between the first reference voltage and the second reference voltage; an adder circuit for outputting an output signal according to the voltage signal and the input signal.

[0012] In a possible implementation manner of the first aspect, the arithmetic circuit further includes: a detection circuit for detecting the maximum absolute value of the input signal within the second unit time period; a calculation circuit for outputting a second control signal according to the maximum absolute value; wherein, the feedback voltage generation circuit further outputs a voltage signal according to the second control signal, and the second control signal is used to indicate the value of an integer multiple of the difference between the first reference voltage and the second reference voltage. In this way, the value of an integer multiple of the appropriate difference between the first reference voltage and the second reference voltage can be selected through the second control signal, reducing the delay in processing the input signal.

[0013] In a possible implementation manner of the first aspect, the absolute value of the voltage signal is 1 time, 2 times, 4 times or 8 times the difference between the first reference voltage and the second reference voltage.

[0014] In a possible implementation manner of the first aspect, the feedback voltage generation circuit includes: a wavelength division multiplexer for outputting an initial voltage signal according to the first reference voltage and / or the second reference voltage, and the first comparison result and / or the second comparison result; a resistor voltage division network circuit for outputting a multiple indication signal according to the second control signal, and the multiple indication signal is used to indicate the multiple; a multiplier for outputting a voltage signal according to the initial voltage signal and the output multiple indication signal, and the voltage signal is equal to the product of the initial voltage signal and the multiple indicated by the multiple indication signal.

[0015] In a possible implementation of the first aspect, the first control signal includes a first sub-control signal and a second sub-control signal. The dynamic threshold selection circuit includes: a plurality of differential voltage regulators for generating a plurality of different first reference voltages; a first wavelength division multiplexer module group for selecting one output from the plurality of first reference voltages according to the first sub-control signal; a plurality of synchronous buck converters for generating a plurality of different second reference voltages; and a second wavelength division multiplexer module group for selecting one output from the plurality of second reference voltages according to the second sub-control signal.

[0016] In a possible implementation of the first aspect, the absolute values of the first reference voltage and the second reference voltage can be unequal.

[0017] In a second aspect, the present application provides an electronic device, which includes an antenna and the signal folding circuit according to any one of the first aspect, and the signal folding circuit is connected to the antenna. Description of the Drawings

[0018] Figure 1 Schematic diagram of the input signal of the processing circuit in the prior art exceeding the dynamic range;

[0019] Figure 2 Schematic diagram of the processed input signal exceeding the dynamic range provided by the embodiment of the present application;

[0020] Figure 3 Schematic diagram of a signal folding circuit provided by the embodiment of the present application;

[0021] Figure 4 Schematic diagram of another signal folding circuit provided by the embodiment of the present application;

[0022] Figure 5 Schematic diagram of yet another signal folding circuit provided by the embodiment of the present application;

[0023] Figure 6 Schematic diagram of a feedback voltage generation circuit provided by the embodiment of the present application;

[0024] Figure 7 Schematic diagram of a dynamic threshold selection circuit provided by the embodiment of the present application. Detailed Embodiments

[0025] Unless otherwise defined, the technical terms or scientific terms used in this application shall have the ordinary meanings understood by those skilled in the art. The terms "first", "second", "third" and similar words used in the description and claims of this application do not indicate any order, quantity or importance, but are only used to distinguish different components. Thus, the features defined with "first", "second", "third" may explicitly or implicitly include one or more of such features. In the description of the embodiments of this application, unless otherwise specified, the meaning of "a plurality" is two or more.

[0026] Regarding the dynamic limitation problem of large and small signals, the industry's solutions include:

[0027] 1. Research devices with a larger dynamic range, but there are theoretical limitations in device performance. It is extremely challenging for the ADC index to exceed -155 dBm / Hz under broadband, so it is difficult to implement.

[0028] 2. Use automatic gain control (AGC) technology before the ADC to ensure that the echo signal is within the dynamic range of the ADC device by detecting amplification or attenuation through a loop.

[0029] For example, the control voltage can be decreased as the input signal gain increases, and the output gain of the variable gain control region decreases correspondingly as the control voltage decreases, so as to obtain an output signal with stable gain. Through the automatic gain control circuit, automatic gain control can be achieved when the gain of the input signal varies within a certain range under the condition that the signal-to-noise ratio (SNR) remains unchanged, and an output signal with a stable gain can be obtained.

[0030] For another example, the AGC factor at the input of the automatic gain control compensation module and I / Q data synchronization can be realized through the interaction of software and hardware; it can quickly track and detect the saturated signal after compensation, quickly attenuate the signal exceeding the threshold, and generate the corresponding DVGA factor according to the attenuation amount; on the basis of not increasing storage resources, the compensated I / Q data and DVGA factor are synchronously output from the decision feedback equalization (DFE) to the baseband.

[0031] However, in automatic gain control, when the signal changes greatly, the automatic generation control (AGC) system will quickly respond and adjust the gain, but this rapid adjustment sometimes causes signal distortion. In a rapidly changing signal environment, the AGC system requires a certain amount of time to detect and adjust the gain. If the change is too rapid, the system may not be able to keep up in time, resulting in unstable or delayed output signals. AGC attenuation will cause the base noise to rise, which will affect the detection of small signals and introduce additional feedback loop hardware and control overhead.

[0032] In addition, with the gradual advancement of the integrated sensing and communication technology, the problem of large and small signals has become increasingly prominent.

[0033] To this end, an embodiment of the present application proposes a signal folding circuit, which can fold the part of the input signal that exceeds the dynamic range of the ADC into the dynamic range, perform lossless processing on the signal, and then restore this signal during subsequent processing. Please refer to Figure 1 , when the input signal exceeds the dynamic range [-λ, λ], the sampled signal of the part of the signal that exceeds the dynamic range is the maximum or minimum value of the corresponding dynamic range. The output signal obtained according to the sampled signal undergoes clipping at the top and bottom, resulting in signal distortion and a decrease in the vector amplitude error. Please refer to Figure 2 , Figure 2 is a schematic diagram of folding the part of the input signal that exceeds the dynamic range [-λ, λ] of the ADC into the dynamic range. Thus, it can be seen that the folded output signal is within the dynamic range, and the original input signal can be restored through subsequent algorithm processing.

[0034] Please refer to Figure 3 , Figure 3 is a signal folding circuit 10 proposed in an embodiment of the present application. It can be understood that the signal folding circuit 10 is used to receive an input signal and output an output signal, and the input signal and the output signal are analog signals.

[0035] The signal folding circuit 10 includes an arithmetic circuit 11 and a dynamic threshold selection circuit 12. Among them, the dynamic threshold selection circuit 12 is used to dynamically select a first reference voltage and a second reference voltage. The first reference voltage and the second reference voltage are two thresholds of the dynamic range to which the input signal needs to be folded. Exemplarily, the first reference voltage is greater than the second reference voltage, and the dynamic range at this time is from the second reference voltage to the first reference voltage.

[0036] Both the first reference voltage and the second reference voltage are dynamically adjustable. Exemplarily, at the first time point and the second time point, the first reference voltage may not be the same, and the second reference voltage may also not be the same. It can be understood that when processing a signal, the larger the dynamic range, the higher the power consumption of the ADC circuit. If the dynamic range is dynamically adjusted during the signal processing, the most suitable dynamic range for processing the signal can be selected, avoiding the use of an overly large dynamic range, which helps to reduce the power consumption of the circuit.

[0037] In some embodiments, the dynamic threshold selection circuit can output according to a first control signal. The first control signal can be obtained according to the output signal of the signal folding circuit 10. It can be understood that if there is no partial signal folding in the output signal, then this part of the signal is within the current dynamic range, for example Figure 1The input signal within the unit time period t1; in the case where the output signal is folded, this part of the signal is outside the current dynamic range, for example Figure 1 The input signal within the unit time period t2.

[0038] The arithmetic circuit 11 is to fold the part of the input signal exceeding the dynamic range into the dynamic range. The arithmetic circuit 11 is used to output an output signal according to the input signal, the first reference voltage, and the second reference voltage, so that the output signal is between the first reference voltage and the second reference voltage. That is to say, the voltage value of the output signal is less than or equal to the first reference voltage, and the voltage value of the output signal is greater than or equal to the second reference voltage. It can be understood that the output signal is equal to the input signal minus or plus an integer multiple of the difference between the first reference voltage and the second reference voltage. That is to say, when the input signal is greater than the first reference voltage, the output signal can be made to be between the first reference voltage and the second reference voltage by subtracting the difference between the first reference voltage and the second reference voltage from the input signal; when the input signal is less than the second reference voltage, the output signal can be made to be between the first reference voltage and the second reference voltage by adding the difference between the first reference voltage and the second reference voltage to the input signal.

[0039] Here, the integer multiple of the difference between the first reference voltage and the second reference voltage can be 0 times, 1 time, 2 times, 3 times or other integer multiples.

[0040] At the same time, the arithmetic circuit also outputs a first control signal according to the output signal. That is to say, the first control signal is output by the arithmetic circuit according to the output signal. In this way, the first reference voltage and the second reference voltage are output according to the first control signal, and it can also be considered that the first reference voltage and the second reference voltage are output according to the output signal. It can be seen from this that in this application, by real-time feedback of the output signal to the arithmetic circuit, the first reference voltage and the second reference voltage output by the dynamic threshold selection circuit are controlled, so as to realize the selection of appropriate first reference voltage and second reference voltage to update the dynamic threshold of the output signal, that is, to limit the output signal between the first reference voltage and the second reference voltage. In this way, the dynamic range of the circuit processing the output signal can be reduced without loss of signal accuracy, and the circuit power consumption can be reduced. In addition, in the integrated communication and sensing system, after analog cancellation of the sensing signal with a large dynamic range, the dynamic threshold can be changed in real time through this signal folding circuit, so that the communication signal is always within the dynamic range that the signal folding circuit can process, and the communication signal can be recovered without loss of the accuracy of the communication signal.

[0041] Exemplarily, when the output signal is equal to the input signal within the first unit time period, the first control signal output reduces the difference between the first reference voltage and the second reference voltage output by the dynamic threshold selection circuit. It can be understood that the signal folding circuit 10 processes the input signal according to the feedback signal (i.e., the output signal). Here, the first unit time period refers to the first unit time period before the current moment. The output signal being equal to the input signal means that no addition or subtraction operation is performed on the input signal. Thus, it is easy for the arithmetic circuit to obtain whether the output signal is equal to the input signal. Reducing the difference between the first reference voltage and the second reference voltage can be achieved by changing the first reference voltage and / or the second reference voltage simultaneously. For example, the first reference voltage can be reduced and the second reference voltage can be increased. When reducing the difference between the first reference voltage and the second reference voltage, the intermediate value between the first reference voltage and the second reference voltage can be kept constant. Of course, this intermediate value can also be changed.

[0042] The amplitude of reducing the difference between the first reference voltage and the second reference voltage can remain unchanged, or can be a certain proportion of the difference between the first reference voltage and the second reference voltage, or a certain proportion of the maximum value of the difference between the possible values of the first reference voltage and the possible values of the second reference voltage. For example, the aforementioned proportion is 1 / 10, 1 / 5, etc.

[0043] Exemplarily, when the output signal is equal to the input signal minus or plus 1 times or more of the difference between the first reference voltage and the second reference voltage, the first control signal output increases the difference between the first reference voltage and the second reference voltage output by the dynamic threshold selection circuit. It can be understood that when the output signal is equal to the input signal minus or plus 1 times or more of the difference between the first reference voltage and the second reference voltage, the input signal exceeds the current dynamic range. To reduce the change of the multi-input signal, the difference between the first reference voltage and the second reference voltage can be increased. It can be understood that the difference between the first reference voltage and the second reference voltage cannot be increased infinitely. The first reference voltage has a maximum value, and the second reference voltage has a minimum value. The dynamic range determined by this maximum value and minimum value is the maximum dynamic range of the system where the signal folding circuit is located.

[0044] The amplitude of each increase can also be a certain proportion of the difference between the first reference voltage and the second reference voltage, or a certain proportion of the maximum value of the difference between the possible values of the first reference voltage and the possible values of the second reference voltage. For example, the aforementioned proportion is 1 / 10, 1 / 5, etc.

[0045] In some embodiments, please refer to Figure 4, the arithmetic circuit 11 may include a comparator module 111, a feedback voltage generation circuit 112, and an adder circuit 113. The comparator module 111 is configured to compare an intermediate input signal with a first reference voltage and output a first comparison result, and compare the intermediate input signal with a second reference voltage and output a second comparison result. The feedback voltage generation circuit 112 outputs a voltage signal according to the first comparison result and / or the second comparison result, and the absolute value of the voltage signal is an integer multiple of the difference between the first reference voltage and the second reference voltage. The adder circuit 113 outputs an output signal according to the voltage signal and the input signal.

[0046] It can be understood that when the input signal is greater than the first reference voltage, the first comparison result may be 1, and the input signal is also greater than the second reference voltage. At this time, the voltage signal output by the feedback voltage generation circuit 112 according to the first comparison result and / or the second comparison result is negative, and the adder circuit 113 is configured to add the voltage signal and the input signal and then output the output signal. The absolute value of the voltage signal may be 1 times the difference between the first reference voltage and the second reference voltage. When the input signal is less than the second reference voltage, the second comparison result may be 1, and the voltage signal is positive, which will not be elaborated here.

[0047] Meanwhile, the first comparison result and / or the second comparison result may be used as a first control signal. Since the first comparison result and the second comparison result are associated with the output signal, it can also be considered that the first control signal is obtained according to the output signal. For example, in the first unit time period, it can be determined whether the input signal is between the first reference voltage and the second reference voltage according to the first comparison result and the second comparison result. If so, the difference between the first reference voltage and the second reference voltage can be reduced. For another example, in the first unit time period, when the input signal is less than the first reference voltage and, within a unit time period in the first unit time period, the input signal is less than the second reference voltage, the first reference voltage and the second reference voltage can be reduced according to the first comparison result and the second comparison result, and the reduction amplitude can be determined respectively according to the first reference voltage and the second reference voltage.

[0048] The comparator module may include a plurality of comparators. For example, the comparator module includes two comparators, one of which is configured to compare with the first reference voltage, and the other compares with the second reference voltage.

[0049] In some embodiments, the arithmetic circuit 11 further includes a detection circuit 114 and a calculation circuit 115. The calculation circuit 115 may be a microcontroller unit module, for example, it may be a single-chip microcomputer equipped with an stm32h723 chip. The calculation circuit 115 may also be other circuits with logical operation functions.

[0050] The detection circuit 114 is configured to detect the maximum absolute value of the input signal within a second unit time period; the calculation circuit 115 is configured to output a second control signal according to the maximum absolute value; wherein, the feedback voltage generation circuit 112 further outputs a voltage signal according to the second control signal, and the second control signal is used to indicate a value that is an integer multiple of the difference between the first reference voltage and the second reference voltage.

[0051] The detection circuit 114 is configured to detect the maximum absolute value of the input signal within a second unit time period, which means that the working time of the signal folding circuit 11 is divided into multiple consecutive second unit time periods, and the detection circuit 114 detects the maximum absolute value of the input signal within each second unit time period. According to this maximum absolute value, the degree to which the input signal exceeds the dynamic range can be determined. If the exceeding degree is large, when adding or subtracting an integer multiple of the difference between the first reference voltage and the second reference voltage to the input signal, the input signal can be quickly folded into the dynamic range determined by the first reference voltage and the second reference voltage.

[0052] It can be understood that when the input signal is not within the dynamic range, by adding or subtracting an integer multiple of the difference between the first reference voltage and the second reference voltage, the input signal can be folded between the first reference voltage and the second reference voltage. Please continue to refer to Figure 4 If the input signal exceeds the dynamic range by a large margin and only one time of adding or subtracting the difference between the first reference voltage and the second reference voltage can be performed each time, then the difference between the first reference voltage and the second reference voltage needs to be added or subtracted multiple times, thereby increasing the processing delay. While in Figure 5 the signal folding circuit shown, the detection circuit 114 can be used to detect the maximum absolute value of the input signal within a second unit time period, and based on this, the integer multiple of adding or subtracting the difference between the first reference voltage and the second reference voltage can be increased, so that the input signal can be folded into the dynamic range faster. For example, when the maximum absolute value exceeds the range by a large margin, the voltage signal of the feedback voltage generation circuit can be appropriately increased. For example, when the value by which the maximum absolute value exceeds the first reference voltage is 8 times the difference between the first reference voltage and the second reference voltage, the output voltage signal can be set to 4 times or 2 times the difference between the first reference voltage and the second reference voltage. It can be understood that the signal does not undergo a jump and there is a changing process. Therefore, when the input signal gradually changes from the aforementioned maximum absolute value, the degree to which the input signal exceeds the dynamic range also changes gradually. When the value by which the maximum absolute value exceeds the first reference voltage is 8 times the difference between the first reference voltage and the second reference voltage, within the next second unit time period, the input signal will not change drastically and will still exceed the first reference voltage value by a relatively large amount.

[0053] It can be seen from this that the calculation circuit 115 can determine the voltage signal output by the feedback voltage generation circuit 112 according to how much the foregoing maximum absolute value exceeds the difference between the first reference voltage and the second reference voltage. For example, the absolute value of the voltage signal can be 1 time, 2 times, 4 times, or 8 times the difference between the first reference voltage and the second reference voltage. The calculation circuit 115 can output a second control signal for indicating the voltage signal output by the feedback voltage generation circuit 112.

[0054] Exemplarily, please refer to Figure 6 , the feedback voltage generation circuit 112 may include a wavelength division multiplexer, a resistive voltage dividing network circuit, and a multiplier.

[0055] The wavelength division multiplexer is configured to output an initial voltage signal according to the first reference voltage and / or the second reference voltage, and the first comparison result and / or the second comparison result. For example, if the first comparison result indicates that the input signal is greater than the first reference voltage value, the difference between the first reference voltage and the second reference voltage needs to be subtracted to fold the input signal into the dynamic range, and at this time, a negative difference between the first reference voltage and the second reference voltage is output; conversely, if the second comparison result indicates that the input signal is less than the second reference voltage value, a positive difference between the first reference voltage and the second reference voltage is output at this time.

[0056] The resistive voltage dividing network circuit is configured to output a multiple indication signal according to the second control signal, and the multiple indication signal is used to indicate the multiple. The multiple can be 1 time, 2 times, 3 times, 4 times, 8 times, etc. For example, the resistive voltage dividing network circuit includes a plurality of resistors connected in series and parallel, and different voltages can be output between different resistors, and the multiple can be indicated by the magnitude of the voltage.

[0057] The multiplier is configured to output a voltage signal according to the initial voltage signal and the output multiple indication signal, and the voltage signal is equal to the product of the initial voltage signal and the multiple indicated by the multiple indication signal.

[0058] Exemplarily, the first control signal can also be output by the calculation circuit 115. Thus, the calculation circuit 115 can output the first control signal according to the dynamic range of the input signal. For example, the calculation circuit 115 can execute a complex algorithm, consider various non-ideal factors to estimate the possible dynamic range of the input signal, and improve the accuracy of the determined first reference voltage and second reference voltage.

[0059] The first control signal may include a first control sub-signal and a second control sub-signal, and the dynamic threshold selection circuit 12 can respectively determine the first reference voltage and the second reference voltage based on this. Thus, the absolute values of the first reference voltage and the second reference voltage can be unequal.

[0060] Exemplarily, please refer to Figure 7, the dynamic threshold selection circuit 12 may include a plurality of differential voltage regulators, a first wavelength division multiplexer module group, a plurality of synchronous buck converters, and a second wavelength division multiplexer module group. The plurality of differential voltage regulators are used to generate a plurality of different first reference voltages; the first wavelength division multiplexer module group can select one output from the plurality of first reference voltages according to the first sub-control signal. The plurality of synchronous buck converters are used to generate a plurality of different second reference voltages; the second wavelength division multiplexer module group can select one output from the plurality of second reference voltages according to the second sub-control signal.

[0061] Next, taking Figure 5 the signal folding circuit shown as an example, the processing process of the input signal will be described, where the calculation circuit 115 is a micro control unit module.

[0062] The input signal amplitude range is [-9λ, 9λ]. After processing it, the signal amplitude is compressed to [-λ, λ]. The initial first reference voltage is set to λ, and the second reference voltage is -λ. Then the difference between the first reference voltage and the second reference voltage is 2λ. The voltage signal output by the feedback voltage generation circuit may include 0, ±2λ, ±4λ, ±6λ, ±8λ.

[0063] It can be understood that during the processing, the calculation circuit 115 can output a first control signal to control the dynamic threshold selection circuit 12 to change the output first reference voltage and second reference voltage.

[0064] When the input signal is 9λ, the comparator module 111 outputs a first comparison result, and the first comparison result indicates that the input signal exceeds the first reference voltage.

[0065] In some embodiments, the calculation circuit 115 outputs a second control signal according to the first comparison result, and the second control signal indicates that the input signal needs to be reduced. The feedback voltage generation circuit 112 can output a voltage signal according to the second control signal, and the voltage signal is -2λ. The adder circuit 113 adds the voltage signal to the input signal, making the input signal become 7λ. Thereafter, the comparator module 111 continues to cyclically compare the changed input signal until the changed input signal is within the dynamic range [-λ, λ], and finally outputs the changed input signal within the dynamic range [-λ, λ] as the output signal.

[0066] In some embodiments, the detection circuit 114 detects that the maximum absolute value of the input signal within the second unit time period before the current moment is 9λ. Therefore, the calculation circuit 115 outputs a second control signal according to the first comparison result and the maximum absolute value detected by the detection circuit. The second control signal indicates that the input signal needs to be decreased, and the decreased amplitude is 4λ, and 4λ is obtained by the calculation circuit 115 through operation according to the maximum absolute value detected by the detection circuit. The feedback voltage generation circuit 112 can output a voltage signal according to the second control signal, and the voltage signal is -4λ. The adder circuit 113 adds the voltage signal and the input signal, so that the input signal becomes 5λ. The comparator module 111 continues to circularly compare the changed input signal until the changed input signal is within the dynamic range [-λ, λ], and finally outputs the changed input signal within the dynamic range [-λ, λ] as the output signal. It can be understood that during the process of continuing the circular comparison, the calculation circuit 115 will change the second control signal, thereby changing the voltage signal output by the feedback voltage generation circuit 112.

[0067] Meanwhile, after the circular comparison ends, that is, after folding the current input signal into the dynamic range [-λ, λ], the calculation circuit 115 can output a first control signal according to the output signal within the first unit time period before the current moment, and change the first reference voltage and the second reference voltage output by the dynamic threshold selection circuit 12 for the next circular comparison.

[0068] In addition, the embodiment of the present application also provides an electronic device, which includes an antenna and the signal folding circuit as described above arbitrarily, and the signal folding circuit is connected to the antenna. The electronic device can be applied to terminals such as mobile phones and tablets or other wireless communication devices.

[0069] It can be understood that in the present application, the transmission of signals between different circuits or modules indicates that there is a connection relationship between different circuits or modules, and this connection can be a direct connection or an indirect connection.

[0070] For those of ordinary skill in the art, other equivalent deformations and substitutions can also be made on the content disclosed in the embodiments of the present application. For example, using a circuit with a different structure but the same function to replace a certain part of the original system (such as a comparator, an adder, etc.), changing the modulation type of the input signal, the circuit power supply voltage, and changing the order of the parallel architecture should also be regarded as the protection scope of the present invention.

[0071] In summary, the above are only the preferred embodiments of the technical solution of the present application, and are not used to limit the protection scope of the present application. Any modification, equivalent substitution, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A signal folding circuit for receiving an input signal and outputting an output signal, where the input signal and the output signal are analog signals, characterized in that, The signal folding circuit includes: A dynamic threshold selection circuit for outputting a first reference voltage and a second reference voltage according to a first control signal, where the first reference voltage is greater than the second reference voltage; An arithmetic circuit for outputting the output signal according to the input signal, the first reference voltage, and the second reference voltage, where the output signal is equal to the input signal minus or plus an integer multiple of the difference between the first reference voltage and the second reference voltage, and the voltage value of the output signal is less than or equal to the first reference voltage and greater than or equal to the second reference voltage; Wherein, the first control signal is output by the arithmetic circuit according to the output signal.

2. The signal folding circuit according to claim 1, characterized in that, In a first unit time period, when the output signal is equal to the input signal, the output first control signal reduces the difference between the first reference voltage and the second reference voltage output by the dynamic threshold selection circuit.

3. The signal folding circuit according to claim 2, wherein When the output signal is equal to the input signal minus or plus 1 times or more of the difference between the first reference voltage and the second reference voltage, the output first control signal increases the difference between the first reference voltage and the second reference voltage output by the dynamic threshold selection circuit.

4. The signal folding circuit according to any one of claims 1 to 3, characterized in that The arithmetic circuit includes: A comparator module for comparing the input signal with the first reference voltage and outputting a first comparison result, and comparing the input signal with the second reference voltage and outputting a second comparison result; A feedback voltage generation circuit for outputting a voltage signal according to the first comparison result and / or the second comparison result, where the absolute value of the voltage signal is an integer multiple of the difference between the first reference voltage and the second reference voltage; An adder circuit for outputting the output signal according to the voltage signal and the input signal.

5. The signal folding circuit according to claim 4, wherein The arithmetic circuit further includes: A detection circuit for detecting the maximum absolute value of the input signal in a second unit time period; A calculation circuit for outputting a second control signal according to the maximum absolute value; Wherein, the feedback voltage generation circuit further outputs the voltage signal according to the second control signal, and the second control signal is used to indicate the value of an integer multiple of the difference between the first reference voltage and the second reference voltage.

6. The signal folding circuit according to claim 5, wherein The absolute value of the voltage signal is 1 time, 2 times, 4 times, or 8 times the difference between the first reference voltage and the second reference voltage.

7. The signal folding circuit according to claim 5 or 6, characterized in that, The feedback voltage generation circuit includes: A wavelength division multiplexer for outputting an initial voltage signal according to the first reference voltage and / or the second reference voltage, and the first comparison result and / or the second comparison result; A resistor voltage division network circuit for outputting a multiple indication signal according to the second control signal, where the multiple indication signal is used to indicate the multiple; A multiplier for outputting the voltage signal according to the initial voltage signal and the output multiple indication signal, where the voltage signal is equal to the product of the initial voltage signal and the multiple indicated by the multiple indication signal.

8. The signal folding circuit according to any one of claims 1 to 6, characterized in that, The first control signal includes a first sub-control signal and a second sub-control signal, and the dynamic threshold selection circuit includes: Multiple differential pressure regulators for generating multiple different first reference voltages; A first wavelength division multiplexer module group for selecting one output from the multiple first reference voltages according to the first sub-control signal; Multiple synchronous buck converters for generating multiple different second reference voltages; A second wavelength division multiplexer module group for selecting one output from the multiple second reference voltages according to the second sub-control signal.

9. The signal folding circuit according to any one of claims 1 to 8, characterized in that The absolute values of the first reference voltage and the second reference voltage can be unequal.

10. An electronic device, characterized in that, The electronic device includes the signal folding circuit and the antenna according to any one of claims 1-9, and the signal folding circuit is connected to the antenna.

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