Dual-channel wake-up receiver

Abstract

The present disclosure provides a dual-channel wake-up receiver, including: a matching network unit, including two radio frequency passbands, for processing received radio frequency input signals into two OOK modulation signals with different wake-up codes, respectively, and outputting them through two channels; a self-mixer unit, for down-converting the two OOK modulation signals to obtain two baseband analog signals, respectively, and outputting them to two baseband circuits; a baseband amplifier unit, for amplifying the two baseband analog signals respectively; a digital processing circuit unit, for converting the amplified two baseband analog signals into digital high and low level signals respectively; a decoding circuit unit, for comparing the matching degree between the digital high and low level signals and the wake-up code, and sending a wake-up request signal when the matching degree reaches the requirement; and a logic operation circuit, for outputting a wake-up instruction when a wake-up request is received.

Description

Technical Field

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

[0002] Today's communication devices have increasingly higher requirements for low power consumption. Usually, when the wake-up receiver does not receive a data communication request identification signal (i.e., a wake-up code), the main receiver is in a dormant state. Once the wake-up code is received, the wake-up receiver will wake up and activate the main receiver. This method can effectively reduce the power consumption of the wireless communication system.

[0003] However, due to the stringent power consumption requirements of the wake-up receiver, its architecture is often relatively simple, so the modulation method of the wake-up code used is also relatively simple, such as On Off Keying (OOK), Two-tone On Off Keying, Channel Embedded On Off Keying (CE-OOK), etc., which results in the wake-up receiver's anti-interference ability being generally poor. Summary of the invention

[0004] Based on the above problems, the present disclosure provides a dual-channel wake-up receiver to alleviate the above technical problems in the prior art.

[0005] (I) Technical solution

[0006] The present disclosure provides a dual-channel wake-up receiver, including: a matching network unit, including two radio frequency passbands, for processing received radio frequency input signals into two OOK modulation signals with different wake-up codes, respectively, and outputting them through two channels; a self-mixer unit, for down-converting the two OOK modulation signals to obtain two baseband analog signals, respectively, and outputting them to two baseband circuits; a baseband amplifier unit, for amplifying the two baseband analog signals respectively; a digital processing circuit unit, for converting the amplified two baseband analog signals into digital high and low level signals respectively; a decoding circuit unit, for comparing the matching degree between the digital high and low level signals and the wake-up code, and sending a wake-up request signal when the matching degree reaches the requirement; and a logic operation circuit, for outputting a wake-up instruction when a wake-up request is received.

[0007] According to an embodiment of the present disclosure, the RF input signal is a dual-channel OOK modulation wake-up sequence, including a first OOK modulation wake-up sequence with a first carrier frequency and a second OOK modulation wake-up sequence with a second carrier frequency, and there is a set frequency difference between the first carrier frequency and the second carrier frequency.

[0008] According to an embodiment of the present disclosure, the matching network unit adjusts the signal voltages corresponding to the first carrier frequency and the second carrier frequency according to the difference between the first carrier frequency and the second carrier frequency to generate two OOK modulation signals with different wake-up codes.

[0009] According to an embodiment of the present disclosure, the matching network unit includes two RF passbands, each of which is provided with at least one micro-electromechanical resonator, wherein the micro-electromechanical resonator is selected from a thin film bulk acoustic wave resonator, a lateral vibration piezoelectric resonator, a bulk acoustic wave resonator, a surface acoustic wave resonator, a Lamb wave resonator, a shear piezoelectric resonator, and a quartz crystal resonator.

[0010] According to the embodiment of the present disclosure, a self-mixer is provided for each channel in the self-mixer unit, and the self-mixer can be an active self-mixer or a passive self-mixer, and the self-mixer can have a single-ended output or a differential output.

[0011] According to an embodiment of the present disclosure, a baseband amplifier unit is provided with a baseband amplifier corresponding to each channel, and the baseband amplifier can eliminate the offset voltage of the baseband circuit by using an offset voltage elimination technology, and the offset voltage elimination technology includes automatic zeroing technology, chopping technology, and AC coupling technology.

[0012] According to an embodiment of the present disclosure, the digital processing circuit unit is provided with a comparator corresponding to each channel, and the comparator is used to convert the amplified baseband analog signal into a digital high level and a digital low level.

[0013] According to an embodiment of the present disclosure, a correlator is provided for each channel in the decoding circuit unit, and the correlator is used to compare the matching degree between the digitized high and low level signals and the wake-up code, and output a wake-up request signal if the matching degree meets the requirement.

[0014] According to the embodiment of the present disclosure, the logic operation circuit is connected to two baseband circuits, and will issue a wake-up instruction as long as it receives a wake-up request signal transmitted from at least one baseband circuit.

[0015] According to an embodiment of the present disclosure, the dual-channel wake-up receiver may further include:

[0016] A low-pass filter module is provided between the baseband amplifier unit and the digital processing circuit unit to further filter out baseband circuit noise;

[0017] The control circuit module is used to control the decision threshold of the digital processing circuit to improve the anti-interference ability of the wake-up receiver.

[0018] (II) Beneficial effects

[0019] It can be seen from the above technical solutions that the dual-channel wake-up receiver disclosed in the present invention has at least one or part of the following beneficial effects:

[0020] (1) In the wake-up receiver with dual-channel direct self-mixing architecture, channel 1 and channel 2 work simultaneously and determine whether to issue a wake-up command at the same time. Compared with the wake-up receiver with direct self-mixing architecture based on traditional OOK modulation, no additional delay is introduced.

[0021] (2) When the wake-up receiver with dual-channel direct self-mixing architecture is working, channel 1 and channel 2 are in a state of working simultaneously. Compared with the traditional wake-up receiver with multi-channel switching, there is no need to introduce a switching circuit in the matching network to switch between channel 1 and channel 2. That is, the wake-up receiver of this architecture does not need to consider the reduction of the matching network performance due to the switching circuit.

[0022] (3) The input signal of the wake-up receiver of the dual-channel direct self-mixing architecture is the dual-channel OOK modulation wake-up sequence proposed in the present invention. The dual-channel OOK modulation wake-up sequence enables the transmitter to send a signal at a maximum of one frequency when transmitting each bit. In this way, the power of the transmitter can be maximized and the communication distance can be improved.

[0023] (4) Since a high-Q-value micro-electromechanical resonator is introduced into the matching network of the wake-up receiver with a dual-channel direct self-mixing architecture, the RF bandwidths of the first RF passband and the second RF passband are very narrow, and the frequency difference between the first RF passband and the second RF passband is large enough. The wake-up receiver has strong anti-interference ability and high isolation between the two paths.

[0024] (5) The last stage of the baseband circuit of the wake-up receiver in the dual-channel direct self-mixing architecture is a logic operation circuit. The decision condition for whether to issue a wake-up instruction is that as long as the decoding circuit of one of the two channels issues a wake-up request, the wake-up instruction will be issued. Therefore, even if the interference is located in the RF passband of a channel and blocks the channel, the other channel will still have a high degree of suppression of the interference, that is, the other channel can still work normally and issue a wake-up request. The system can still correctly issue a wake-up instruction in the end, and the wake-up receiver has a strong anti-interference ability.

[0025] (6) The wake-up receiver with dual-channel direct self-mixing architecture retains the advantage of extremely low power consumption of the traditional direct self-mixing architecture wake-up receiver, with power consumption in the nW range. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A wake-up receiver for a direct self-mixing architecture;

[0027] Figure 2The waveform of the RF input signal of an embodiment of the present disclosure and the waveform of two OOK modulation signals with different wake-up codes obtained after the RF input signal passes through the matching network unit are shown in FIG.

[0028] Figure 3 It is a schematic diagram of the waveform of the RF input signal of another embodiment of the present disclosure and the waveforms of two OOK modulation signals with different wake-up codes obtained after the RF input signal passes through the matching network unit.

[0029] Figure 4 FIG. 4 is a schematic diagram of a wake-up receiver of a dual-channel direct self-mixing architecture according to an embodiment of the present disclosure.

[0030] Figure 5 FIG. 4 is a schematic diagram showing the variation of the passive voltage gain of a matching network unit with frequency according to an embodiment of the present disclosure.

[0031] Figure 6 Schematic diagram of the signal-to-interference ratio of a wake-up receiver of a dual-channel direct self-mixing architecture to continuous wave interference according to an embodiment of the present disclosure.

[0032] Figure 7 Schematic diagram of the signal-to-interference ratio of the wake-up receiver of the dual-channel direct self-mixing architecture to OOK interference according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0033] The present disclosure provides a dual-channel wake-up receiver. In order to solve the problem of poor anti-interference ability of the traditional direct self-mixing architecture wake-up receiver, a new wake-up receiver architecture is proposed, namely a wake-up receiver with a dual-channel direct self-mixing architecture. The advantage of extremely low power consumption of the traditional direct self-mixing architecture wake-up receiver is retained, and the anti-interference ability, especially the ability to resist AM interference, is greatly improved without reducing the sensitivity of the system. In view of the new wake-up receiver architecture proposed in the present disclosure, the present disclosure also proposes a dual-channel OOK modulation wake-up sequence. The wake-up sequence is used as a radio frequency input signal. After being filtered and amplified by the dual-pole narrow radio frequency passband matching network proposed in the present disclosure, it will be split into two-channel OOK modulation signals with different carrier frequencies and different wake-up codes.

[0034] In the process of implementing the present disclosure, the inventors found that for a wake-up receiver using OOK modulation, a direct self-mixing architecture is generally used, such as Figure 1 As shown, its main advantage is extremely low power consumption, which can reach the nW level. However, since the interference will be directly down-converted to the baseband by the mixer along with the signal, its anti-interference ability is very poor.

[0035] In current research, there are mainly the following methods to improve the anti-interference capability of the wake-up receiver with direct self-mixing architecture: ① Introduce filters based on micro-electro-mechanical systems (MEMS) resonators (or directly use MEMS resonators for impedance matching) for narrowband filtering ② Suppress continuous wave interference by eliminating the offset voltage of the baseband or introducing an adaptive offset compensation algorithm during baseband signal processing ③ Replace the digital correlator of the baseband with an analog correlator to improve the anti-interference capability. However, most of these methods for improving the anti-interference capability can only improve the anti-interference capability of the wake-up receiver against continuous wave interference, and some methods will reduce the sensitivity of the wake-up receiver while improving the anti-interference capability. What's worse, even if the above anti-interference capability improvement methods are used, the anti-interference capability of the wake-up receiver with direct self-mixing architecture for amplitude modulation (AM) interference is still very poor, and the signal interference ratio (SIR) can even be higher than 0dB. Since the wake-up receiver usually works in a crowded frequency band such as ISM, there may be strong interference in the environment, and the poor anti-interference ability greatly limits the use of the direct self-mixing architecture wake-up receiver.

[0036] Although the traditional wake-up receiver with direct self-mixing architecture has the advantage of extremely low power consumption of nW level, its anti-interference ability is very poor because the interference will be directly down-converted to baseband by the self-mixer along with the signal. Once the interference is within its RF passband, the signal cannot be demodulated correctly, so that the wake-up command cannot be successfully issued, which greatly limits the practical application of the wake-up receiver with this architecture in crowded frequency bands with more interference. Therefore, the present disclosure proposes a wake-up receiver with dual-channel direct self-mixing architecture.

[0037] In order to make the objectives, technical solutions and advantages of the present disclosure more clearly understood, the present disclosure is further described in detail below in combination with specific embodiments and with reference to the accompanying drawings.

[0038] In an embodiment of the present disclosure, a dual-channel wake-up receiver is provided, Figure 4 ,as well as Figure 2 and Figure 3 As shown, the dual-channel wake-up receiver includes:

[0039] A matching network unit includes two RF passbands, and is used to process the received RF input signal into two OOK modulation signals with different wake-up codes, and output them through two channels (channel 1 and channel 2);

[0040] A self-mixer unit is used to down-convert the two OOK modulated signals to obtain two baseband analog signals, and output them to the two baseband circuits respectively;

[0041] The baseband amplifier unit is used to amplify the two baseband analog signals respectively;

[0042] A digital processing circuit unit is used to convert the two amplified baseband analog signals into digital high and low level signals respectively;

[0043] A decoding circuit unit compares the matching degree between the digitized high and low level signals and the wake-up code, and sends a wake-up request signal when the matching degree reaches the requirement; and

[0044] The logic operation circuit outputs a wake-up instruction upon receiving a wake-up request.

[0045] According to an embodiment of the present disclosure, the matching network unit includes two extremely narrow RF passbands (a first RF passband and a second RF passband), the fractional bandwidth of each RF passband is respectively <0.5%, and at least one micro-electromechanical resonator is arranged in each RF passband, and the micro-electromechanical resonator is selected from a thin film bulk acoustic wave resonator, a transverse vibration piezoelectric resonator, a bulk acoustic wave resonator, a surface acoustic wave resonator, a Lamb wave resonator, a shear piezoelectric resonator, and a quartz crystal resonator. Figure 4 The MEMS resonator shown in the embodiment is a film bulk acoustic resonator (FBAR). It should be noted that the number of MEMS resonators used in each RF passband in the bipolar narrow RF passband matching network can be either 1 or N, where N≥2. It should be noted that the bipolar narrow RF passband matching network based on MEMS resonators as above can be used in the RF front-end circuit; a traditional matching network based on discrete or lumped components can also be used, but in this case, a narrowband filter needs to be added to the RF front-end circuit to obtain two extremely narrow RF passbands.

[0046] In some embodiments, the OOK modulated signals output by the bipolar narrow RF passband matching network in both channel 1 and channel 2 can be either single-ended signals or differential signals.

[0047] According to the embodiment of the present disclosure, a self-mixer is provided for each channel in the self-mixer unit, namely, self-mixer 1 and self-mixer 2. The self-mixer can be an active self-mixer or a passive self-mixer, and the self-mixer can be a single-ended output or a differential output.

[0048] According to the embodiment of the present disclosure, the baseband amplifier unit is provided with a baseband amplifier corresponding to each channel, namely baseband amplifier 1 and baseband amplifier 2. The baseband amplifier can eliminate the offset voltage of the baseband circuit by using the offset voltage elimination technology, and the offset voltage elimination technology includes automatic zeroing technology, chopping technology, and AC coupling technology.

[0049] According to the embodiment of the present disclosure, the digital processing circuit unit is provided with a comparator corresponding to each channel, namely comparator 1 and comparator 2, and the comparator is used to convert the amplified baseband analog signal into a digital high level and a digital low level.

[0050] According to an embodiment of the present disclosure, a correlator is provided for each channel in the decoding circuit unit, namely correlator 1 and correlator 2. The correlators are used to compare the matching degree between the digitized high and low level signals and the wake-up code respectively. If the matching degree meets the requirement, a wake-up request signal is output.

[0051] According to the embodiment of the present disclosure, the logic operation circuit is connected to two baseband circuits, and will issue a wake-up instruction as long as it receives a wake-up request signal transmitted from at least one baseband circuit.

[0052] According to the disclosed embodiment, the matching network unit is based on a micro-electromechanical resonator with high Q (Q>1000) and high FOM value (FOM>100) to obtain two extremely narrow RF passbands and provide a relatively high passive voltage gain (>18dB).

[0053] According to the embodiment of the present disclosure, Figure 2 and Figure 3 As shown, the RF input signal is a dual-channel OOK modulation wake-up sequence, including a first OOK modulation wake-up sequence with a first carrier frequency and a second OOK modulation wake-up sequence with a second carrier frequency, and there is a set frequency difference between the first carrier frequency and the second carrier frequency. The matching network unit adjusts the signal voltage corresponding to the first carrier frequency and the second carrier frequency according to the difference between the first carrier frequency and the second carrier frequency to generate two OOK modulation signals with different wake-up codes, that is, split into two channels, with different carrier frequencies and different wake-up codes (for example, wake-up code 1 and wake-up code 2).

[0054] More specifically, Figure 2 As shown, a waveform diagram of a radio frequency input signal and an example of a waveform diagram of the radio frequency input signal after passing through a bipolar narrow radio frequency passband matching network, the radio frequency input signal is a dual-channel OOK modulation wake-up sequence proposed in the present disclosure, assuming that the wake-up sequence is composed of a 4-bit carrier frequency of f rf1 The first OOK modulation wake-up sequence and the 4-bit carrier frequency are f rf2 The second OOK modulation wake-up sequence is composed of 8 bits in total. After the RF input signal enters the bipolar narrow RF passband matching network, the first RF passband of the matching network (center frequency is f rf1 ) will convert the frequency f rf1 The signal voltage of the first OOK modulation wake-up sequence is amplified and suppressed at frequency f rf2 The signal f rf1 With frf2 There is a set frequency difference between them, f rf1 With f rf2 The relationship satisfies 2*(f rf1 -f rf2 ) / (f rf1 +f rf2 )>1%; the second RF passband of the matching network will pass the frequency f rf2 The signal voltage of the second OOK modulation wake-up sequence is amplified and the frequency f is suppressed rf1 After amplification and filtering by the bipolar narrow RF passband matching network, the RF input signal will be split into two channels of OOK modulated signals with different wake-up codes. Figure 2 In the case shown, the wake-up code input to channel 1 is 8 bits with a carrier frequency of f rf1 The wake-up code of input channel 2 is 8 bits and the carrier frequency is f rf2 of "01010011".

[0055] The matching network unit with a bipolar narrow RF passband outputs the carrier frequency f from channel 1. rf1 The first OOK modulated signal enters the self-mixing unit and is down-converted to baseband by the self-mixer 1. The carrier frequency is f rf2 The second OOK modulated signal enters the self-mixer 2 in the self-mixing unit and is down-converted to baseband by the self-mixer 2. The signal at the output end of the self-mixer 1 enters the baseband amplifier 1 for baseband analog signal amplification processing, and the signal at the output end of the self-mixer 2 enters the baseband amplifier 2 for baseband analog signal amplification processing. The output ends of the baseband amplifiers 1 and 2 are respectively connected to the input ends of the comparator 1 and the comparator 2 in the digital processing circuit unit. It should be noted that in addition to comparators, other types of digital processing circuits can also be used. Comparator 1 and comparator 2 convert the baseband analog signals output by the baseband amplifiers 1 and 2 into digital high and low level signals 1 and digital high and low level signals 2, that is, digital "01" levels. The outputs of comparator 1 and comparator 2 are connected to correlator 1 and correlator 2 in the decoding circuit unit, respectively. It should be noted that in addition to correlators, other types of decoding circuits can also be used. Correlator 1 and correlator 2 are used to check the matching degree between digitized high and low level signal 1 and programmable wake-up code 1, and the matching degree between digitized high and low level signal 2 and programmable wake-up code 2. If the matching degree meets the requirement, a wake-up request is issued (i.e., a logic "1" level is output). Finally, the outputs of correlator 1 and correlator 2 are connected to the logic operation circuit for processing. As long as the correlator of one channel issues a wake-up request, the logic operation circuit will output a wake-up instruction.

[0056] In some embodiments, the baseband amplifier may introduce offset voltage elimination technologies such as automatic zeroing technology and chopping technology to eliminate the offset voltage of the baseband circuit and reduce flicker noise, so as to optimize the sensitivity of the wake-up receiver and improve the anti-interference ability of the wake-up receiver.

[0057] In some embodiments, a low-pass filter may be added between the baseband amplifier and the digital processing circuit to further filter out baseband noise and optimize the sensitivity of the wake-up receiver.

[0058] In some embodiments, a control circuit such as an adaptive offset compensation circuit may be introduced into the baseband circuit, and the anti-interference capability of the wake-up receiver may be further improved by controlling the decision threshold of the digital processing circuit and other methods.

[0059] In some embodiments, improving the Q value of the MEMS resonator can improve the anti-interference capability of the wake-up receiver.

[0060] In some embodiments, appropriately increasing the difference between the carrier frequencies of channel 1 and channel 2 can enhance the anti-interference capability of the wake-up receiver.

[0061] In some embodiments, improving the FOM value of the MEMS resonator can optimize the sensitivity of the wake-up receiver.

[0062] In some embodiments, the specific value and the specific number of bits of the dual-channel OOK modulation wake-up sequence can be changed according to actual needs. Figure 3 As shown in FIG. 1 , another feasible embodiment of a dual-channel OOK modulation wake-up sequence is shown. After the dual-channel OOK modulation wake-up sequence is amplified and filtered by the dual-polarity narrow RF passband matching network proposed in this design, the RF input signal will be split into two channels of OOK modulation signals with different wake-up codes. Figure 3 In the case shown, it is assumed that the wake-up sequence is composed of a 3-bit carrier with a frequency of f rf1 The carrier frequency of "1" and 3 bits is f rf2 The wake-up code of channel 1 is 7 bits, and the carrier frequency is f rf1 The wake-up code of channel 2 is 7 bits and the carrier frequency is f rf2 of "0101001".

[0063] like Figure 5 As shown, Figure 4Schematic diagram of the passive voltage gain of the bipolar narrow RF passband matching network changing with frequency. The passive voltage gain of channel 1 refers to the ratio of the voltage amplitude at the output of the bipolar narrow RF passband matching network at channel 1 to the voltage amplitude at the input (expressed in dB); the passive voltage gain of channel 2 refers to the ratio of the voltage amplitude at the output of the bipolar narrow RF passband matching network at channel 2 to the voltage amplitude at the input (expressed in dB). Figure 5 It can be seen that the RF bandwidths of RF passbands 1 and 2 corresponding to channel 1 and channel 2 respectively are very narrow; and the isolation between the two channels of channel 1 and channel 2 is relatively high; the bipolar narrow RF passband matching network can provide a large passive voltage gain for the signals at the center frequencies of RF passband 1 and RF passband 2.

[0064] from Figure 6 It can be concluded that the worst SIR of the dual-channel wake-up receiver with direct self-mixing architecture is less than -27dB for continuous wave interference at different frequencies, and the best SIR can reach -55dB, which has a strong ability to resist continuous wave interference. Figure 7 It can be concluded that the worst SIR of the dual-channel wake-up receiver with direct self-mixing architecture is less than -12dB for OOK interference at different frequencies, and the best SIR can reach -41dB, which shows that the dual-channel wake-up receiver with direct self-mixing architecture has a strong ability to resist AM interference. The overall power consumption of the circuit in this embodiment is <10nW, and a strong anti-interference ability is achieved under extremely low power consumption conditions.

[0065] According to an embodiment of the present disclosure, the dual-channel wake-up receiver may further include:

[0066] A low-pass filter module is provided between the baseband amplifier unit and the digital processing circuit unit to further filter out baseband circuit noise;

[0067] The control circuit module is used to control the decision threshold of the digital processing circuit to improve the anti-interference ability of the wake-up receiver.

[0068] So far, the embodiments of the present disclosure have been described in detail in conjunction with the accompanying drawings. It should be noted that the implementation methods not shown or described in the drawings or the body of the specification are all forms known to ordinary technicians in the relevant technical field and are not described in detail. In addition, the above definitions of each element and method are not limited to the various specific structures, shapes or methods mentioned in the embodiments, and ordinary technicians in the field can simply change or replace them.

[0069] According to the above description, those skilled in the art should have a clear understanding of the dual-channel wake-up receiver disclosed in the present invention.

[0070] In summary, the present disclosure provides a dual-channel wake-up receiver, which retains the advantage of nW power consumption of the traditional direct self-mixing architecture wake-up receiver, and greatly improves the anti-interference capability, especially the anti-AM interference capability, without reducing the system sensitivity.

[0071] It should also be noted that the above are different embodiments provided by the present disclosure. These embodiments are used to illustrate the technical content of the present disclosure, rather than to limit the scope of protection of the present disclosure. A feature of an embodiment can be applied to other embodiments through appropriate modification, replacement, combination, and separation.

[0072] It should be noted that, in this document, unless otherwise specified, “a” element is not limited to a single element, but may include one or more elements.

[0073] In addition, in this document, unless otherwise specified, ordinal numbers such as "first" and "second" are only used to distinguish multiple components with the same name, and do not indicate that there is a hierarchy, level, execution order, or process order between them. A "first" component and a "second" component may appear together in the same component, or appear in different components. The presence of a component with a larger ordinal number does not necessarily indicate the presence of another component with a smaller ordinal number.

[0074] In this document, unless otherwise specified, the so-called feature A "or" or "and / or" (and / or) feature B means that A exists alone, B exists alone, or A and B exist at the same time; the so-called feature A "and" (and) or "and" (and) or "and" (and) feature B means that A and B exist at the same time; the so-called "includes", "comprising", "has" and "containing" mean including but not limited to these.

[0075] In addition, in this document, the terms "upper", "lower", "left", "right", "front", "back", or "between" are only used to describe the relative positions between multiple elements, and can be extended to include translation, rotation, or mirroring. In addition, in this document, unless otherwise specified, "an element is on another element" or similar descriptions do not necessarily mean that the element contacts the other element.

[0076] In addition, unless the steps are specifically described or must occur in sequence, the order of the above steps is not limited to the above list, and can be changed or rearranged according to the required design. And the above embodiments can be mixed and matched with each other or with other embodiments based on design and reliability considerations, that is, the technical features in different embodiments can be freely combined to form more embodiments.

[0077] The specific embodiments described above further illustrate the purpose, technical solutions and beneficial effects of the present disclosure. It should be understood that the above description is only a specific embodiment of the present disclosure and is not intended to limit the present disclosure. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present disclosure should be included in the protection scope of the present disclosure.

Claims

1. A dual-channel wake-up receiver, comprising: A matching network unit, comprising two radio frequency passbands, each of which is provided with at least one micro-electromechanical resonator, for processing a received radio frequency input signal into two OOK modulation signals with different wake-up codes, respectively, and outputting the signals through two channels, wherein the radio frequency input signal is a dual-channel OOK modulation wake-up sequence, comprising a first OOK modulation wake-up sequence with a first carrier frequency and a second OOK modulation wake-up sequence with a second carrier frequency, wherein a set frequency difference exists between the first carrier frequency and the second carrier frequency; A self-mixer unit is used to down-convert the two OOK modulated signals to obtain two baseband analog signals, and output them to the two baseband circuits respectively; The baseband amplifier unit is used to amplify the two baseband analog signals respectively; A digital processing circuit unit is used to convert the two amplified baseband analog signals into digital high and low level signals respectively; A decoding circuit unit compares the matching degree between the digitized high and low level signals and the wake-up code, and sends a wake-up request signal when the matching degree reaches the requirement; and The logic operation circuit outputs a wake-up instruction upon receiving a wake-up request.

2. According to the dual-channel wake-up receiver of claim 1, the matching network unit adjusts the signal voltage corresponding to the first carrier frequency and the second carrier frequency according to the difference between the first carrier frequency and the second carrier frequency to generate two OOK modulation signals with different wake-up codes.

3. The dual-channel wake-up receiver according to claim 1, wherein the microelectromechanical resonator is selected from a thin film bulk acoustic wave resonator, a lateral vibration piezoelectric resonator, a bulk acoustic wave resonator, a surface acoustic wave resonator, a Lamb wave resonator, a shear piezoelectric resonator, and a quartz crystal resonator.

4. According to the dual-channel wake-up receiver of claim 1, a self-mixer is provided in the self-mixer unit corresponding to each channel, the self-mixer is an active self-mixer or a passive self-mixer, and the self-mixer can be a single-ended output or a differential output.

5. According to the dual-channel wake-up receiver of claim 1, the baseband amplifier unit is provided with a baseband amplifier corresponding to each channel, and the baseband amplifier can eliminate the offset voltage of the baseband circuit through the offset voltage elimination technology, and the offset voltage elimination technology includes automatic zeroing technology, chopping technology, and AC coupling technology.

6. The dual-channel wake-up receiver according to claim 1, wherein the digital processing circuit unit is provided with a comparator corresponding to each channel, and the comparator is used to convert the amplified baseband analog signal into a digital high level and a digital low level.

7. According to the dual-channel wake-up receiver of claim 1, a correlator is provided for each channel in the decoding circuit unit, and the correlator is used to compare the matching degree between the digitized high and low level signals and the wake-up code, and output a wake-up request signal if the matching degree meets the requirement.

8. According to the dual-channel wake-up receiver of claim 1, the logic operation circuit is connected to two baseband circuits, and a wake-up instruction is issued as long as a wake-up request signal transmitted from at least one baseband circuit is received.

9. The dual-channel wake-up receiver according to claim 1, further comprising: A low-pass filter module is provided between the baseband amplifier unit and the digital processing circuit unit to further filter out baseband circuit noise; The control circuit module is used to control the decision threshold of the digital processing circuit to improve the anti-interference ability of the wake-up receiver.

Images