Wake-up receiver

Abstract

The invention provides a wake-up receiver which can be applied to the technical field of radio frequency wireless communication. The wake-up receiver comprises a matching network module used for filtering and amplifying an FSK radio frequency signal and coupling an out-of-band interference signal to obtain an interference input signal and a target input signal; the energy detector module comprises a first single-ended output energy detector and a second single-ended output energy detector, and the first single-ended output energy detector and the second single-ended output energy detector have the same structure; the first single-ended output energy detector is used for performing down-conversion processing on an interference input signal and a target input signal corresponding to a first frequency, and the second single-ended output energy detector is used for performing down-conversion processing on the interference input signal and a target input signal corresponding to a second frequency; and the wake-up module is used for processing the differential signal of the first baseband signal and the second baseband signal to generate a wake-up instruction.

Description

Technical Field

[0001] The present disclosure relates to the technical field of radio frequency wireless communication, and more particularly, to a wake-up receiver. Background Art

[0002] The wake-up receiver replaces the monitoring channel of the main receiver with lower power consumption. Since the main receiver is activated only when there is a communication request, the power consumption overhead of the system in standby mode is reduced, which is beneficial to prolong the life of related nodes.

[0003] In the process of implementing the concept of the present disclosure, the inventors discovered that the wake-up receiver in the related art has at least the technical problems of poor suppression capability for out-of-band interference signals and low system sensitivity. Summary of the invention

[0004] In view of this, the present disclosure provides a wake-up receiver.

[0005] One aspect of the present disclosure provides a wake-up receiver, comprising:

[0006] A matching network module, used for filtering and amplifying the received FSK radio frequency signal, and coupling the out-of-band interference signal to obtain an interference input signal and a target input signal, wherein the frequency of the FSK radio frequency signal includes a first frequency for transmitting a first bit of data and a second frequency for transmitting a second bit of data, and the matching network module includes a main matching network with a filtering center frequency of the first frequency and an auxiliary matching network with a filtering center frequency of the second frequency;

[0007] An energy detector module, comprising a first single-ended output energy detector connected to the main matching network and a second single-ended output energy detector connected to the auxiliary matching network, wherein the first single-ended output energy detector has the same structure as the second single-ended output energy detector, the first single-ended output energy detector is used to perform down-conversion processing on an interference input signal and the target input signal corresponding to the first frequency to obtain a first baseband signal, and the second single-ended output energy detector is used to perform down-conversion processing on the interference input signal and the target input signal corresponding to the second frequency to obtain a second baseband signal;

[0008] The wake-up module is used to process the differential signal between the first baseband signal and the second baseband signal to generate a wake-up instruction.

[0009] According to an embodiment of the present disclosure, the above-mentioned filtering and amplifying processing of the received FSK RF signal includes: the above-mentioned main matching network is used to amplify the above-mentioned RF signal corresponding to the above-mentioned first frequency, and suppress the above-mentioned RF signal corresponding to the above-mentioned second frequency, so as to obtain the target input signal corresponding to the above-mentioned first frequency; the above-mentioned auxiliary matching network is used to amplify the above-mentioned RF signal corresponding to the above-mentioned second frequency, and suppress the above-mentioned RF signal corresponding to the above-mentioned first frequency, so as to obtain the target input signal corresponding to the above-mentioned second frequency.

[0010] According to an embodiment of the present disclosure, the matching element of the matching network module is a MEMS resonator, and the MEMS resonator includes a first MEMS resonator and a second MEMS resonator. The inductive matching element of the main matching network is the first MEMS resonator, and the inductive matching element of the auxiliary matching network is the second MEMS resonator. The difference between the static capacitance of the first MEMS resonator and the static capacitance of the second MEMS resonator is less than a predetermined error threshold.

[0011] According to an embodiment of the present disclosure, the first MEMS resonator includes one resonator or multiple resonators connected in series, the second MEMS resonator includes one or more resonators connected in series, and the types of the resonators include one of the following: thin film bulk acoustic wave resonator, lateral vibration piezoelectric resonator, bulk acoustic wave resonator, surface acoustic wave resonator, Lamb wave resonator, shear piezoelectric resonator.

[0012] According to an embodiment of the present disclosure, the wake-up module includes:

[0013] A baseband amplifier, used to amplify the first baseband signal and the second baseband signal to obtain an amplified signal;

[0014] A comparator, used for digitally processing the amplified signal to obtain a digital signal;

[0015] The correlator is used to generate the wake-up instruction according to the digital signal and the wake-up threshold.

[0016] According to an embodiment of the present disclosure, the baseband amplifier is also used to correct the offset voltage of the energy detector module and the baseband amplifier through self-zeroing and chopping processing.

[0017] According to an embodiment of the present disclosure, the baseband amplifier is configured as a fully differential structure or a two-input structure, the comparator is a static comparator or a dynamic comparator, and the correlator is a digital correlator or an analog correlator.

[0018] According to an embodiment of the present disclosure, the structures of the first single-ended output energy detector and the second single-ended output energy detector are equivalent to a source-source mixer or a passive source-source mixer.

[0019] According to an embodiment of the present disclosure, the matching network module adopts a main matching network with a filtering center frequency of a first frequency and an auxiliary matching network with a filtering center frequency of a second frequency. Therefore, for the received FSK radio frequency signal, the main matching network can process the part corresponding to the first frequency and suppress the part corresponding to the second frequency, while the auxiliary matching network can just process the part corresponding to the second frequency and suppress the part corresponding to the first frequency; at the same time, for the received out-of-band interference signal, the matching network module is equivalent to a static capacitor, that is, it can transmit the interference input signal to the energy detector module after the main matching network and the auxiliary matching network are coupled; the first single-ended output energy detector and the second single-ended output energy detector with the same structure in the energy detector module are respectively connected to the main matching network and the auxiliary matching network. The first single-ended output energy detector is used to down-convert the interference input signal and the target input signal corresponding to the first frequency to obtain a first baseband signal. The second single-ended output energy detector is used to down-convert the interference input signal and the target input signal corresponding to the second frequency to obtain a second baseband signal. In the differential signal of the first baseband signal and the second baseband signal, the interference input signal is offset to avoid the influence of out-of-band interference signals in the subsequent signal processing of the wake-up module. At the same time, the introduction of the auxiliary matching network can reduce the minimum signal-to-noise ratio required for the wake-up module input, which is beneficial to the improvement of the system sensitivity. Compared with the multi-channel architecture in the related technology, the signals in the two RF channels can be processed by only one baseband circuit, which reduces the power consumption of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The above and other objects, features and advantages of the present disclosure will become more apparent through the following description of the embodiments of the present disclosure with reference to the accompanying drawings, in which:

[0021] Figure 1a Schematic diagram of ED-1 in related art st Schematic diagram of the wake-up receiver architecture.

[0022] Figure 1b Schematic diagram of ED-1 in related art st Schematic diagram of the working principle of the wake-up receiver affected by out-of-band interference signals.

[0023] Figure 2 The schematic diagram shows the architecture of a wake-up receiver according to an embodiment of the present disclosure.

[0024] Figure 3aThe working principle diagram of the wake-up receiver suppressing out-of-band interference signals according to an embodiment of the present disclosure is schematically shown.

[0025] Figure 3b The working principle diagram of the wake-up receiver transmitting the FSK radio frequency signal according to the embodiment of the present disclosure is schematically shown.

[0026] Figure 4 The waveform diagram of each node of the wake-up receiver according to the embodiment of the present disclosure is schematically shown.

[0027] Figure 5 The waveform diagram of each node of the wake-up receiver in the related art is schematically shown. DETAILED DESCRIPTION

[0028] Hereinafter, embodiments of the present disclosure will be described with reference to the accompanying drawings. However, it should be understood that these descriptions are exemplary only and are not intended to limit the scope of the present disclosure. In the following detailed description, for ease of explanation, many specific details are set forth to provide a comprehensive understanding of the embodiments of the present disclosure. However, it is apparent that one or more embodiments may also be implemented without these specific details. In addition, in the following description, descriptions of known structures and technologies are omitted to avoid unnecessary confusion of the concepts of the present disclosure.

[0029] The terms used herein are only for describing specific embodiments and are not intended to limit the present disclosure. The terms "comprise", "include", etc. used herein indicate the existence of features, steps, operations and / or components, but do not exclude the existence or addition of one or more other features, steps, operations or components.

[0030] All terms (including technical and scientific terms) used herein have the meanings commonly understood by those skilled in the art unless otherwise defined. It should be noted that the terms used herein should be interpreted as having a meaning consistent with the context of this specification and should not be interpreted in an idealized or overly rigid manner.

[0031] When using expressions such as "at least one of A, B, and C, etc.", they should generally be interpreted according to the meaning of the expression commonly understood by those skilled in the art (for example, "a system having at least one of A, B, and C" should include but is not limited to a system having A alone, B alone, C alone, A and B, A and C, B and C, and / or A, B, C, etc.).

[0032] As IoT communication nodes have increasingly stringent requirements on device power consumption, Energy Detector First (ED-1 st) The wake-up receiver has attracted much attention in related fields due to its advantage of low system power consumption at the nanowatt or even picowatt level.

[0033] In the process of implementing the disclosed inventive concept, the inventors found that a micro-electro-mechanical system (MEMS) resonator can be used to replace the inductor for impedance matching to improve the ED-1 st To better understand this ED-1 st The architecture of the wake-up receiver is as follows: Figure 1a and Figure 1b ED-1 in related art st The processing of the RF input signal and the out-of-band interference signal by the wake-up receiver is described.

[0034] Figure 1a Schematic diagram of ED-1 in related art st Schematic diagram of the wake-up receiver architecture.

[0035] Figure 1b Schematic diagram of ED-1 in related art st Schematic diagram of the working principle of the wake-up receiver affected by out-of-band interference signals.

[0036] like Figure 1a and Figure 1b As shown, ED-1 st The wake-up receiver includes an off-chip MEMS matching network 110 , a pseudo-differential energy detector 120 , a baseband amplifier 130 , a comparator 140 and a correlator 150 .

[0037] For receiving OOK (On-Off Keying, binary amplitude keying) RF input signal, the off-chip MEMS matching network 110 provides it with passive voltage gain, and transmits it to the pseudo-differential energy detector 120 for down-conversion to obtain a baseband signal, which is transmitted to the baseband amplifier 130 to amplify the baseband signal. The comparator 140 is used to digitize the amplified baseband signal, and the correlator 150 judges the digitized signal to determine whether to issue a wake-up request.

[0038] For out-of-band interference signals received at far frequencies, since the off-chip MEMS matching network 110 is equivalent to the static capacitance of the device at a frequency far away from the resonant frequency, the pseudo-differential energy detector 120 does not have the ability to suppress common-mode interference. Therefore, the pseudo-differential output 121 of the out-of-band interference signal after down-conversion by the pseudo-differential energy detector 120 will be amplified and identified by the baseband amplifier 130, thereby interfering with the correlator 150's judgment on the signal, and further affecting the normal recognition of the system wake-up code.

[0039] In order to overcome the influence of interference signals, related technologies consider introducing multi-stage filters to filter out interference signals, but this results in higher insertion loss and reduced system sensitivity. At the same time, due to the limited performance of the device, the sensitivity gain of the MEMS matching network is still far behind that of the inductor, making it difficult to improve the system sensitivity performance.

[0040] In view of this, an embodiment of the present disclosure provides a wake-up receiver, including: a matching network module, used to filter and amplify the received FSK radio frequency signal, and couple the out-of-band interference signal to obtain an interference input signal and a target input signal, wherein the frequency of the FSK radio frequency signal includes a first frequency for transmitting a first bit of data and a second frequency for transmitting a second bit of data, and the matching network module includes a main matching network with a filtering center frequency of the first frequency and an auxiliary matching network with a filtering center frequency of the second frequency; an energy detector module, including a first single-ended output energy detector connected to the main matching network and a second single-ended output energy detector connected to the auxiliary matching network, and the first single-ended output energy detector and the second single-ended output energy detector have the same structure, the first single-ended output energy detector is used to down-convert the interference input signal and the target input signal corresponding to the first frequency to obtain a first baseband signal, and the second single-ended output energy detector is used to down-convert the interference input signal and the target input signal corresponding to the second frequency to obtain a second baseband signal; a wake-up module, used to process the differential signal of the first baseband signal and the second baseband signal to generate a wake-up instruction.

[0041] Figure 2 The schematic diagram shows the architecture of a wake-up receiver according to an embodiment of the present disclosure.

[0042] like Figure 2 As shown, the embodiment 200 includes a matching network module 210, an energy detector module 220 and a wake-up module 230. The matching network module 210 includes a main matching network 211 whose filtering center frequency is a first frequency and an auxiliary matching network 212 whose filtering center frequency is a second frequency. The energy detector module 220 includes a first single-ended output energy detector 221 connected to the main matching network 211 and a second single-ended output energy detector 222 connected to the auxiliary matching network 212.

[0043] According to an embodiment of the present disclosure, the RF input of the matching network module 210 adopts an FSK (Frequency-ShiftKeying) RF signal. The FSK RF signal can transmit digital information through the frequency of the carrier. When the FSK RF signal is the first bit of data (bit 1), the frequency of the FSK RF signal is the first frequency. When the FSK RF signal is the second bit of data (bit 0), the frequency of the FSK RF signal is the second frequency. Compared with the OOK modulation signal in the related art, which represents digital information by the presence or absence of the control signal, FSK modulation makes the frequency change of the signal the main feature of carrying information. Since the frequency is a relatively stable attribute of the signal, when facing noise and interference, the change of frequency is not as easily affected directly as the amplitude. Therefore, selecting the FSK signal as the input of the RF signal enables the system to have a stronger anti-interference ability, which is conducive to improving the transmission efficiency of the signal.

[0044] According to an embodiment of the present disclosure, the first single-ended output energy detector and the second single-ended output energy detector have the same structure, so that the down-converted output signals generated by the interference input signal in the first single-ended output energy detector and the second single-ended output energy detector have the same polarity and similar amplitude. At the input end of the wake-up module 230, the interference signals in the first baseband signal and the second baseband signal can cancel each other and will not be amplified and recognized by the subsequent baseband circuit.

[0045] According to an embodiment of the present disclosure, the wake-up module is used to process a differential signal between a first baseband signal and a second baseband signal to generate a wake-up instruction.

[0046] According to an embodiment of the present disclosure, the matching network module adopts a main matching network with a filtering center frequency of a first frequency and an auxiliary matching network with a filtering center frequency of a second frequency. Therefore, for the received FSK radio frequency signal, the main matching network can process the part corresponding to the first frequency and suppress the part corresponding to the second frequency, while the auxiliary matching network can just process the part corresponding to the second frequency and suppress the part corresponding to the first frequency; at the same time, for the received out-of-band interference signal, the matching network module is equivalent to a static capacitor, that is, it can transmit the interference input signal to the energy detector module after the main matching network and the auxiliary matching network are coupled; the first single-ended output energy detector and the second single-ended output energy detector with the same structure in the energy detector module are respectively connected to the main matching network and the auxiliary matching network. The first single-ended output energy detector is used to down-convert the interference input signal and the target input signal corresponding to the first frequency to obtain a first baseband signal. The second single-ended output energy detector is used to down-convert the interference input signal and the target input signal corresponding to the second frequency to obtain a second baseband signal. In the differential signal of the first baseband signal and the second baseband signal, the interference input signal is offset to avoid the influence of out-of-band interference signals in the subsequent signal processing of the wake-up module. At the same time, the introduction of the auxiliary matching network can reduce the minimum signal-to-noise ratio required for the wake-up module input, which is beneficial to the improvement of the system sensitivity. Compared with the multi-channel architecture in the related technology, the signals in the two RF channels can be processed by only one baseband circuit, which reduces the power consumption of the system.

[0047] According to an embodiment of the present disclosure, the matching element of the matching network module is a MEMS resonator, the MEMS resonator includes a first MEMS resonator and a second MEMS resonator, the inductive matching element of the main matching network is the first MEMS resonator, the inductive matching element of the auxiliary matching network is the second MEMS resonator, and the difference between the static capacitance of the first MEMS resonator and the static capacitance of the second MEMS resonator is less than a predetermined error threshold.

[0048] According to an embodiment of the present disclosure, a MEMS resonator with a high Q value may be used, such as a Film Bulk Acoustic Resonator (FBAR) as a core matching element to reduce the system RF passband bandwidth, so that the matching network module can more effectively filter out-of-band signals and amplify in-band signals, thereby improving the system's in-band anti-interference ability and sensitivity. The difference between the static capacitance of the first MEMS resonator and the static capacitance of the second MEMS resonator is less than a predetermined error threshold in order to make the capacitance values ​​of the two static capacitors as close as possible, ensuring that the main matching network and the auxiliary matching network present similar performance for out-of-band interference signals.

[0049] According to an embodiment of the present disclosure, the first MEMS resonator includes one resonator or multiple resonators connected in series, the second MEMS resonator includes one or more resonators connected in series, and the type of the resonator includes one of the following: thin film bulk acoustic wave resonator, lateral vibration piezoelectric resonator, bulk acoustic wave resonator, surface acoustic wave resonator, Lamb wave resonator, shear piezoelectric resonator.

[0050] According to the embodiments of the present disclosure, each MEMS matching network may use only a single resonator, or may use multiple resonators connected in series to improve the sensitivity gain of the matching network, without specific limitation.

[0051] According to the embodiments of the present disclosure, the first MEMS resonator and the second MEMS resonator with similar static capacitance can improve the ability to suppress out-of-band interference signals, enhance the sensitivity of the system, and ensure accurate transmission and processing of radio frequency signals.

[0052] According to an embodiment of the present disclosure, the wake-up module includes: a baseband amplifier, used to amplify the first baseband signal and the second baseband signal to obtain an amplified signal; a comparator, used to digitize the amplified signal to obtain a digital signal; and a correlator, used to generate a wake-up instruction based on the digital signal and the wake-up threshold.

[0053] Figure 3a The working principle diagram of the wake-up receiver suppressing out-of-band interference signals according to an embodiment of the present disclosure is schematically shown.

[0054] Figure 3b The working principle diagram of the wake-up receiver transmitting the FSK radio frequency signal according to the embodiment of the present disclosure is schematically shown.

[0055] like Figure 3a and Figure 3b As shown, the wake-up receiver includes a matching network module 210 , an energy detector module 220 and a wake-up module 230 , wherein the wake-up module includes a baseband amplifier 231 , a comparator 232 and a correlator 233 .

[0056] According to the embodiment of the present disclosure, after the out-of-band interference signal enters the matching network module 210, the static capacitance C corresponding to the main matching network is 0，主 The static capacitance of the first MEMS resonator and the auxiliary matching network is C 0，辅 After the second MEMS resonator, it enters the first single-ended output energy detector 221 and the second single-ended output energy detector 222. The energy detector module 220 down-converts the interference input signal to obtain two identical interference outputs 221, so they will cancel each other out when entering the baseband amplifier 231. Therefore, the wake-up module only processes the RF input signal, avoiding the influence of out-of-band interference signals.

[0057] According to an embodiment of the present disclosure, after the FSK RF signal enters the matching network module 210, the carrier of the first frequency is amplified and the carrier of the second frequency is suppressed through the main matching network 211, and the carrier of the second frequency is amplified and the carrier of the first frequency is suppressed through the auxiliary matching network 212. The obtained RF input signal enters the energy detector module 220 for down-conversion. Since the out-of-band interference signal is offset when entering the baseband amplifier 231, the baseband amplifier only amplifies the down-conversion signal corresponding to the RF input signal, and sends the obtained amplified signal to the comparator 232 for digital processing to obtain a digital signal. The correlator 233 compares the digital signal with the wake-up threshold to generate a corresponding wake-up instruction.

[0058] According to an embodiment of the present disclosure, the baseband amplifier is also used to correct the offset voltage of the energy detector module and the baseband amplifier through self-zeroing and chopping processing. The baseband amplifier is configured as a fully differential structure or a two-input structure, the comparator is a static comparator or a dynamic comparator, and the correlator is a digital correlator or an analog correlator.

[0059] According to an embodiment of the present disclosure, the structures of the first single-ended output energy detector and the second single-ended output energy detector are equivalent to a source-source mixer or a passive source-source mixer.

[0060] According to the embodiments of the present disclosure, the system power consumption can be maintained at a low level of nanowatts.

[0061] According to an embodiment of the present disclosure, the received FSK radio frequency signal is filtered and amplified, including: a main matching network is used to amplify the radio frequency signal corresponding to the first frequency, and suppress the radio frequency signal corresponding to the second frequency, to obtain a target input signal corresponding to the first frequency; an auxiliary matching network is used to amplify the radio frequency signal corresponding to the second frequency, and suppress the radio frequency signal corresponding to the first frequency, to obtain a target input signal corresponding to the second frequency. .

[0062] Figure 4 The waveform diagram of each node of the wake-up receiver according to the embodiment of the present disclosure is schematically shown.

[0063] like Figure 4As shown, the waveform of the FSK RF signal after being processed by the matching network module is shown in the figure. The main matching network is used to filter and amplify the FSK RF signal corresponding to the first frequency, and suppress the FSK RF signal corresponding to the second frequency, so as to obtain the target input signal corresponding to the first frequency; the auxiliary matching network is used to filter and amplify the FSK RF signal corresponding to the second frequency, and suppress the FSK RF signal corresponding to the first frequency, so as to obtain the target input signal corresponding to the second frequency. The target input signal enters the first single-ended output energy detector and the second single-ended output energy detector for self-mixing and then inputs the baseband amplifier. The waveforms of the positive and negative inputs of the baseband amplifier are shown in the figure. The first baseband signal and the second baseband signal amplified by the baseband amplifier are input to the comparator. The comparator input is pulled down from the original 0 level to the "-1" level during the transmission signal "0", which increases the signal swing, thereby reducing the minimum signal-to-noise ratio required by the comparator input, which is beneficial to improving the system sensitivity. "Wake up" can mean that when the wake-up instruction is 1, the digital signal is greater than the wake-up threshold of the correlator.

[0064] Figure 5 The waveform diagram of each node of the wake-up receiver in the related art is schematically shown.

[0065] contrast Figure 5 and Figure 4 It can be seen that the RF input of the wake-up receiver in the related technology is an OOK signal, which is unable to transmit digital information through carriers of different frequencies. At the same time, the pseudo-differential energy detector has only one input, which causes the level of the comparator input to remain at 0 level during the transmission signal "0", that is, the recognition sensitivity of the RF input is low.

[0066] It can be seen that the wake-up receiver of the embodiment of the present disclosure not only has a high suppression capability for out-of-band interference signals, but also reduces the minimum signal-to-noise ratio required at the comparator input, thereby improving the sensitivity of the system.

[0067] The flowcharts and block diagrams in the accompanying drawings illustrate the possible implementation architecture, functions and operations of the systems, methods and computer program products according to various embodiments of the present disclosure. In this regard, each box in the flowchart or block diagram may represent a module, a program segment, or a part of a code, and the above-mentioned module, program segment, or a part of the code contains one or more executable instructions for implementing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the box may also occur in an order different from that marked in the accompanying drawings. For example, two boxes represented in succession can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each box in the block diagram or flowchart, and the combination of boxes in the block diagram or flowchart, can be implemented with a dedicated hardware-based system that performs a specified function or operation, or can be implemented with a combination of dedicated hardware and computer instructions. It can be understood by those skilled in the art that the features recorded in the various embodiments of the present disclosure can be combined and / or combined in a variety of ways, even if such a combination or combination is not explicitly recorded in the present disclosure. In particular, without departing from the spirit and teaching of the present disclosure, the features described in the various embodiments of the present disclosure may be combined and / or combined in a variety of ways. All of these combinations and / or combinations fall within the scope of the present disclosure.

[0068] The embodiments of the present disclosure are described above. However, these embodiments are only for illustrative purposes and are not intended to limit the scope of the present disclosure. Although the embodiments are described above, this does not mean that the measures in the various embodiments cannot be used in combination to advantage. Without departing from the scope of the present disclosure, those skilled in the art may make a variety of substitutions and modifications, which should all fall within the scope of the present disclosure.

Claims

1. A wake-up receiver, characterized in that: include: A matching network module, used for filtering and amplifying the received FSK radio frequency signal, and coupling the out-of-band interference signal to obtain an interference input signal and a target input signal, wherein the frequency of the FSK radio frequency signal includes a first frequency for transmitting a first bit of data and a second frequency for transmitting a second bit of data, and the matching network module includes a main matching network with a filtering center frequency of the first frequency and an auxiliary matching network with a filtering center frequency of the second frequency; An energy detector module, comprising a first single-ended output energy detector connected to the main matching network and a second single-ended output energy detector connected to the auxiliary matching network, wherein the first single-ended output energy detector and the second single-ended output energy detector have the same structure, the first single-ended output energy detector is used to perform down-conversion processing on an interference input signal and a target input signal corresponding to the first frequency to obtain a first baseband signal, and the second single-ended output energy detector is used to perform down-conversion processing on the interference input signal and the target input signal corresponding to the second frequency to obtain a second baseband signal; The wake-up module is used to process the differential signal between the first baseband signal and the second baseband signal to generate a wake-up instruction.

2. The wake-up receiver according to claim 1, characterized in that The filtering and amplifying process of the received FSK radio frequency signal comprises: The main matching network is used to amplify the radio frequency signal corresponding to the first frequency and suppress the radio frequency signal corresponding to the second frequency to obtain a target input signal corresponding to the first frequency; The auxiliary matching network is used to amplify the radio frequency signal corresponding to the second frequency and suppress the radio frequency signal corresponding to the first frequency to obtain a target input signal corresponding to the second frequency.

3. The wake-up receiver according to claim 1, characterized in that The matching element of the matching network module is a MEMS resonator, and the MEMS resonator includes a first MEMS resonator and a second MEMS resonator. The inductive matching element of the main matching network is the first MEMS resonator, and the inductive matching element of the auxiliary matching network is the second MEMS resonator. The difference between the static capacitance of the first MEMS resonator and the static capacitance of the second MEMS resonator is less than a predetermined error threshold.

4. The wake-up receiver according to claim 3, characterized in that The first MEMS resonator includes one resonator or multiple resonators connected in series, the second MEMS resonator includes one or more resonators connected in series, and the type of the resonator includes one of the following: thin film bulk acoustic wave resonator, lateral vibration piezoelectric resonator, bulk acoustic wave resonator, surface acoustic wave resonator, Lamb wave resonator, shear piezoelectric resonator.

5. The wake-up receiver according to claim 1, characterized in that The wake-up module comprises: A baseband amplifier, used for amplifying the first baseband signal and the second baseband signal to obtain an amplified signal; A comparator, used for digitally processing the amplified signal to obtain a digital signal; The correlator is used to generate the wake-up instruction according to the digital signal and the wake-up threshold.

6. The wake-up receiver according to claim 5, characterized in that The baseband amplifier is also used to correct the offset voltage of the energy detector module and the baseband amplifier through self-zeroing and chopping processing.

7. The wake-up receiver according to claim 5, characterized in that The baseband amplifier is configured as a fully differential structure or a two-input structure, the comparator is a static comparator or a dynamic comparator, and the correlator is a digital correlator or an analog correlator.

8. The wake-up receiver according to claim 1, characterized in that The structures of the first single-ended output energy detector and the second single-ended output energy detector are equivalent to a source-source mixer or a passive source-source mixer.

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