WO2017132856A1 - Circuit filtrant, circuit anti-interférence de radiofréquence et circuit de génération de signaux rf - Google Patents

Circuit filtrant, circuit anti-interférence de radiofréquence et circuit de génération de signaux rf Download PDF

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Publication number
WO2017132856A1
WO2017132856A1 PCT/CN2016/073276 CN2016073276W WO2017132856A1 WO 2017132856 A1 WO2017132856 A1 WO 2017132856A1 CN 2016073276 W CN2016073276 W CN 2016073276W WO 2017132856 A1 WO2017132856 A1 WO 2017132856A1
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Prior art keywords
filter
filter circuit
module
optional
circuit
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PCT/CN2016/073276
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English (en)
Chinese (zh)
Inventor
冷鹏
胡林亚
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海能达通信股份有限公司
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Priority to PCT/CN2016/073276 priority Critical patent/WO2017132856A1/fr
Publication of WO2017132856A1 publication Critical patent/WO2017132856A1/fr

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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H17/00—Networks using digital techniques
    • H03H17/02—Frequency selective networks

Definitions

  • the invention relates to filtering, in particular to a filtering circuit, a radio frequency anti-interference circuit and a radio frequency signal generating circuit.
  • a filter is a circuit that only allows signals in a certain frequency range to pass normally while blocking another part of the frequency.
  • a filter can be used for filtering.
  • the working frequency band of a filter is fixed.
  • multiple filters are needed.
  • switches are used to switch between multiple filters according to different frequency bands. /O port resources and PCB area, increase costs.
  • the filter circuit comprises: at least one filter module, wherein at least one filter module is an optional filter module; the optional filter module comprises a basic filter component and at least one optional connection filter component, and the basic filter component is connected to the input of the other filter module or the filter circuit /output terminal, optional connection filter component is connected to the basic filter component through the switching component, wherein the optional connection filter component is a capacitor, an inductor, a transmission line, a microstrip or a resonant cavity; the switching component receives the control signal and is controlled under the control signal
  • the selected connection filter component is electrically or non-conducting with the basic filter component, and changes the cutoff frequency of the filter circuit when the electrical conduction is performed.
  • the basic filter component includes at least one resonant component, and at least one end of the resonant component is connected to an input/output terminal of another filtering module or a filtering circuit; each resonant component is in one-to-one correspondence with an optional connecting filtering component, and each optional connecting filter component
  • the two ends are respectively connected to the two ends of the resonant element through a switching element, wherein one of the optional connecting filter element and the resonant element is a capacitor, and the other is an inductor; when the switching element is electrically turned on, the filter element and the resonant element are optionally connected A parallel resonance is formed and the cutoff frequency of the filter circuit is changed.
  • the optional filtering module is a low-pass filtering module;
  • the resonant component is an inductor, and two ends of the resonant component are respectively connected to input/output ends of other filtering modules or filter circuits; or the resonant component is a capacitor, and one end of the resonant component is connected to the other The input/output terminal of the filter module or filter circuit is grounded at the other end.
  • the optional filter module is a high-pass filter module; the resonant component is a capacitor, and the two ends of the resonant component are respectively connected to the input/output terminals of other filter modules or filter circuits; or the resonant component is an inductor, and one end of the resonant component is connected to other filters.
  • the input/output of the module or filter circuit is grounded at the other end.
  • the switching element is a diode, a switching transistor, a field effect transistor or a switching chip.
  • the switching element is a PIN diode or a Schottky diode.
  • the filter circuit further includes at least one notch module.
  • One end of the notch module is connected to the input/output end of the other filter module or the filter circuit, and the other end is grounded.
  • the center frequency of the notch module is not in the pass band of the filter circuit.
  • the notch module and the optional filtering module are in one-to-one correspondence, one end of the notch module is connected to the input/output end of the other filtering module or the filtering circuit through the second switching element, the other end is grounded, and the second switching element receives the corresponding optional filtering
  • the control signal of the module when the control signal controls the second switching element to be electrically turned on, the trap module works, and the trap module does not work at other times.
  • control signals received by the switching elements of each of the optional filtering modules are independent of each other.
  • the radio frequency anti-interference circuit comprises: the filter circuit and the amplifier according to any one of the above items connected in sequence, wherein the signal is filtered by the filter circuit and sent to the amplifier for amplification.
  • the radio frequency signal generating circuit comprises: a radio frequency signal generator connected in sequence and a filtering circuit according to any one of the above, wherein the radio frequency signal generated by the radio frequency signal generator is filtered by the filtering circuit and output.
  • the invention has the beneficial effects of: adding an optional connection filter component to the filter circuit, and optionally connecting the filter component to connect the basic filter component through the switch component, the switch component receiving the control signal and making the optional connection filter component and the basic under the control signal control
  • the filter element is electrically connected, and the connection of the filter element can be selected when the electrical conduction is performed, and the cutoff frequency of the filter circuit is changed, thereby realizing the change of the switching element by changing the control signal to change whether the switching element is turned on in a filter circuit. Frequency, no need to use a filter circuit for each cutoff frequency and switch between multiple filter circuits with switches, saving I / O port resources and PCB area, reducing costs.
  • FIG. 1 is a schematic structural view of a first embodiment of a filter circuit of the present invention
  • FIG. 2 is a schematic structural view of a second embodiment of a filter circuit of the present invention.
  • FIG. 3 is a circuit diagram of a specific filter circuit of a second embodiment of the filter circuit of the present invention.
  • FIG. 4 is a frequency response diagram of a first filter signal and a second control signal of a specific filter circuit in a second embodiment of the filter circuit of the present invention
  • FIG. 5 is a frequency response diagram of a specific filter circuit of the second embodiment of the filter circuit of the present invention when the first control signal is at a high level and the second control signal is at a low level;
  • FIG. 6 is a frequency response diagram of a specific filter circuit of the second embodiment of the filter circuit of the present invention when the first control signal and the second control signal are both at a high level;
  • FIG. 7 is a schematic structural diagram of an optional filter module being low-pass and a resonant component being a capacitor in an embodiment of the filter circuit of the present invention
  • FIG. 8 is a schematic structural diagram of an optional filter module of the embodiment of the filter circuit of the present invention having a high pass and a resonant component being a capacitor;
  • FIG. 9 is a schematic structural diagram of an optional filter module of the embodiment of the filter circuit of the present invention having a high pass and a resonant component being an inductor;
  • FIG. 10 is a schematic structural view of a third embodiment of a filter circuit of the present invention.
  • FIG. 11 is a circuit diagram of a specific filter circuit of a third embodiment of the filter circuit of the present invention.
  • FIG. 12 is a frequency response diagram of a third control signal and a fourth control signal of a specific filter circuit of the third embodiment of the filter circuit of the present invention.
  • FIG. 13 is a frequency response diagram of a specific filter circuit of the third embodiment of the filter circuit of the present invention when the third control signal is at a high level and the fourth control signal is at a low level;
  • FIG. 14 is a frequency response diagram of a third control signal and a fourth control signal of a specific filter circuit of the third embodiment of the filter circuit of the present invention.
  • FIG. 15 is a schematic structural diagram of a first embodiment of a radio frequency anti-interference circuit of the present invention.
  • Figure 16 is a block diagram showing the structure of a first embodiment of the radio frequency signal generating circuit of the present invention.
  • the first embodiment of the filter circuit of the present invention includes:
  • Two filter modules 1 and 2 are connected in sequence, wherein the filter module 1 is an optional filter module.
  • Two filtering modules are shown in the figure, one of which is an optional filtering module.
  • the number of actual filtering modules and the number of optional filtering modules in the filtering module can be determined as needed. If there is only one filtering module, the filtering module is an optional filtering module; if the number of filtering modules is greater than one, then at least one of the filtering modules is an optional filtering module, and the filtering modules are sequentially connected.
  • Each filter module can be low pass, high pass, band pass or band stop, depending on actual needs.
  • the optional filtering module 1 comprises a basic filtering element 11 and an optional connecting filtering element 12. Only one basic filter element 11 is shown in the figure, the two ends of which are respectively connected to the output of the other filter module 1 and the filter circuit, that is, the basic filter element 11 is connected in series in the path of the filter circuit.
  • the number of actual basic filter elements 11 may be one or more, and there is no excessive limitation thereto.
  • Each basic filter component can also have one end connected to the other filter module or the input/output of the filter circuit.
  • the optional connection filter element 12 is connected to the basic filter element 12 via a switching element 13.
  • the optional connection filter element 12 and the basic filter element 11 in the figure are connected in series via the switching element 13, and the actual optional connection filter element can also be connected in parallel with the basic filter element via the switching element.
  • the basic filter component and the optional connection filter component 12 are capacitors, inductors, transmission lines, microstrips or resonant cavities, and may also be other filter components such as crystal resonators, ceramic filters, surface acoustic wave filters, and the like.
  • the switching element 13 receives the control signal and electrically or non-conducts the optional connection filter element 12 with the basic filter element 11 under the control of the control signal. If more than one optional filtering module is included in the filtering circuit, the control signals received by the switching elements of each of the optional filtering modules may be independent of each other, that is, each control signal controls a switching element of an optional filtering module; or at least one The control signal controls the switching elements of at least two of the optional filtering modules.
  • the cutoff frequency of the filter circuit is changed.
  • the optional connection filter element 12 operates and changes the order of the filter circuit, thereby changing the cutoff frequency of the filter circuit.
  • the cutoff frequency of the filter circuit can be changed without changing the order of the filter circuit.
  • the basic filter component is a capacitor
  • the optional filter component is also a capacitor, and is connected in parallel with the basic filter component through the switch component.
  • the optional connection filter component is equivalent to the basic filter component as a new capacitor whose capacitance value is different from the capacitance value of the original basic filter component, thereby changing the cutoff frequency of the filter circuit.
  • the cut-off frequency of the filter circuit when the switching element is turned on is lower than the cut-off frequency of the filter circuit when the switch element is not turned on; when the filter circuit is In Qualcomm, when the switching element is turned on, the cutoff frequency of the filter circuit is higher than the cutoff frequency of the filter circuit when the switching element is not turned on; when the filter circuit is band pass or band stop, it is determined according to actual needs, and generally the switching element is turned on.
  • the 3dB bandwidth of the time filter circuit is smaller than when the switching element is not conducting.
  • an optional connection filter component is added to the filter circuit, and the optional filter component is connected to the basic filter component through the switch component, and the switch component receives the control signal and makes the optional connection filter component and the basic under the control signal control.
  • the filter element is electrically connected, and the connection of the filter element can be selected when the electrical conduction is performed, and the cutoff frequency of the filter circuit is changed, thereby realizing the change of the switching element by changing the control signal to change whether the switching element is turned on in a filter circuit. Frequency, no need to use a filter circuit for each cutoff frequency and switch between multiple filter circuits with switches, saving I / O port resources and PCB area, reducing costs.
  • the second embodiment of the filter circuit of the present invention is further defined on the basis of the first embodiment of the filter circuit of the present invention.
  • the basic filter component includes a first inductor L1 and a first capacitor C1, wherein the first The inductor L1 is a resonant element, and at least one end of the resonant element L1 is connected to an input/output terminal of another filter module or filter circuit.
  • the second capacitor C2 is an optional connection filter element, and its two ends are respectively connected to both ends of the resonance element L1 through one switching element 103.
  • the optional connection filter component C2 drawn in the figure is a capacitor, and the resonance component L1 is an inductance, or vice versa, as long as the connection mode of the resonance component in the filter circuit does not change the frequency response type of the filter circuit, for example, by low pass. For Qualcomm and so on. Only one optional connection filter element and one resonance element are shown in the figure. If there are more than one optional connection filter element and resonance element, the number of optional connection filter elements and resonance elements is the same, and each resonance element and each One optional connection filter element is in one-to-one correspondence.
  • capacitors and inductors in the figure can also be realized with open/short transmission lines or micro-bands.
  • the optional connection filter element is connected in parallel with the resonance element through the switching element, and one of the optional connection filter element and the resonance element is a capacitor, and the other is an inductor.
  • the switching element is turned on, a new one is formed.
  • the inductor and capacitor are connected in parallel for resonance, and the circuit design is convenient and can effectively change the cutoff frequency of the filter circuit.
  • FIG. 3 is a circuit diagram of a specific filter circuit according to a second embodiment of the filter circuit of the present invention.
  • the filter circuit 100 is used for RF harmonic suppression and is a low-pass filter circuit.
  • the filter circuit 100 includes filtering modules 110, 120, and 130, wherein the filtering module 110 is a low-pass elliptical filtering module, and the filtering modules 120 and 130 are optional filtering modules.
  • the optional filtering module 120 includes a thirteenth inductor L13, a fourteenth inductor L14, a twenty-fourth capacitor C24, and a twenty-fifth capacitor C25, wherein the thirteenth inductor L13 and the fourteenth inductor L14 are resonant components. .
  • the resonant elements L13 and L14 are connected in series in the path of the filter circuit.
  • the first end of the thirteenth inductor L13 is connected to the filter module 110 through the coupling capacitor C14, and the second end is connected to the first end of the fourteenth inductor L14, and the fourteenth inductor L14
  • the second end of the second filter is coupled to the optional filter module 130 via a coupling capacitor C17.
  • the fifteenth capacitor C15 and the sixteenth capacitor C16 are optional connection filter elements, the fifteenth capacitor C15 is connected in parallel with the thirteenth inductor L13 through the switching elements D1 and D2, and the sixteenth capacitor C16 is passed through the switching elements D2 and D3 and Fourteen inductors L14 are connected in parallel.
  • the switching elements D1, D2 and D3 receive the first control signal.
  • the optional filtering module 130 includes a fifteenth inductor L15, a sixteenth inductor L16, a twenty-sixth capacitor C26, and a twenty-seventh capacitor C27, wherein the fifteenth inductor L15 and the sixteenth inductor L16 are resonant components. .
  • the resonant elements L15 and L16 are connected in series in the path of the filter circuit.
  • the first end of the fifteenth inductor L15 is connected to the optional filter module 120 through the coupling capacitor C17, and the second end is connected to the first end of the sixteenth inductor L16.
  • the second end of the inductor L16 is connected to the output of the filter circuit through a coupling capacitor C20.
  • the eighteenth capacitor C18 and the nineteenth capacitor C19 are optional connection filter components, the eighteenth capacitor C18 is connected in parallel with the fifteenth inductor L15 through the switching elements D4 and D5, and the nineteenth capacitor C19 is passed through the switching elements D5 and D6. Sixteen inductors L16 are connected in parallel. The switching elements D4, D5 and D6 receive the second control signal.
  • the filter circuit 100 has a pass band of 312-527 MHz for suppressing the second harmonic of 312 MHz and above.
  • FIG. 5 is a frequency response of the filter circuit 100 when the first control signal is at a high level and the second control signal is at a low level.
  • the frequency of the m1 point in the figure is 203. MHz, the corresponding amplitude-frequency response is -2.289dB; the frequency of m2 is 406
  • the frequency of m3 is 312MHz, the corresponding amplitude-frequency response is -2.522dB;
  • the frequency of m4 is 624MHz, and the corresponding amplitude-frequency response is -39.448dB.
  • the filter circuit 100 has a pass band of 203-312 MHz and is used to suppress second harmonics of 203 MHz and above.
  • the filter circuit 100 has a pass band of 143-203 MHz and is used to suppress the second harmonic of 143 MHz or more.
  • the cutoff frequency of the filter circuit 100 is changed to achieve harmonic suppression of different frequency bands.
  • the optional filtering module 10 in FIG. 2 is low-pass, one end of the resonant element L1 is connected to other filtering modules, and the other end is connected to the output end of the filtering circuit, that is, the resonant element L1 is connected in series in the path of the filtering circuit.
  • the optional filter module 20 is low-pass, and the resonant component is a third capacitor C3.
  • One end of the resonant component C3 is connected to the output end of the filter circuit, and the other end is grounded.
  • the optional connection filter component is the fourth inductor L4.
  • the optional filter module 30 is a high pass
  • the resonant element is a fifth capacitor C5
  • one end of the resonant element C5 is connected to another filter module, and the other end is connected to the output of the filter circuit.
  • the end, that is, the resonant element C5 is connected in series in the path of the filter circuit, and the optional connection filter element is the sixth inductor L6.
  • the optional filtering module 40 is a high-pass
  • the resonant component is a seventh inductor L7, one end of the resonant component L7 is connected to the output end of the filter circuit, and the other end is grounded
  • the optional filter component is the eighth capacitor C8.
  • the third embodiment of the filter circuit of the present invention is based on the first embodiment of the filter circuit of the present invention, further comprising a notch module 5 corresponding to the optional filter module 4, and the notch module 5 One end is connected to the output end of the filter circuit through the second switching element 51, and the other end is grounded.
  • the center frequency of the notch module 5 is not within the pass band of the filter circuit.
  • the second switching element 51 receives the control signal of the corresponding optional filtering module 4. When the control signal controls the second switching element 51 to be electrically turned on, the trap module 5 operates, and the other time trapping module 5 does not work.
  • the trapping module is added, which can block the passage of a signal of a specified frequency, and improve the suppression characteristic of the signal in the non-passband of the filter circuit.
  • the notch module does not have a one-to-one correspondence with the optional filtering module, and one end of the notch module is directly connected to the input/output end of the other filtering module or the filtering circuit, and the other end is grounded.
  • FIG. 11 is a circuit diagram of a specific filter circuit according to a third embodiment of the filter circuit of the present invention.
  • the filter circuit 200 is used for RF harmonic suppression and is a low-pass filter circuit.
  • the filter circuit 200 includes filter modules 210, 220, 230 and notch modules 240, 250.
  • the filtering module 210 is a low-pass elliptical filtering module, and the filtering modules 220 and 230 are optional filtering modules.
  • the optional filtering module 220 includes a basic filtering element thirty-third inductor L33 and a forty-second capacitor C42, wherein the thirty-third inductor L33 is a resonant element.
  • the resonant element L33 is connected in series in the path of the filter circuit, the first end of which is connected to the filter module 210, and the second end is connected to the optional filter module 230 via the coupling capacitors C35 and C36.
  • the thirty-fourth capacitor C34 is an optional connection filter element, and is connected in parallel with the resonance element L33 through the switching elements D11 and D12.
  • the switching elements D11 and D12 receive the third control signal.
  • the optional filtering module 230 includes a basic filter element 34th inductance L34 and a forty-third capacitance C43, wherein the thirty-fourth inductance L34 is a resonance element.
  • the resonant element L34 is connected in series in the path of the filter circuit, and the first end thereof is connected to the optional filter module 230 through the coupling capacitors C35 and C36, and the second end is connected to the output end of the filter circuit 200 through the coupling capacitor C38.
  • the thirty-seventh capacitor C37 is an optional connection filter element, which is connected in parallel with the resonance element L34 through the switching elements D13 and D14.
  • the switching elements D13 and D14 receive the fourth control signal.
  • the trap module 240 includes a thirty-fifth inductor L35, a forty-fourth capacitor C44, and a eighteenth resistor R18.
  • the first end of the thirty-fifth inductor L35 is connected to the optional filtering module 220 through the second switching element D15 and the coupling capacitor C35, the second end is connected to the first end of the forty-fourth capacitor C44; the fourth fourteenth capacitor C44 is The two ends are grounded; the first end of the eighteenth resistor R18 is connected to the first end of the thirty-fifth inductor L35, and the second end is connected to the second end of the forty-fourth capacitor C44.
  • the second switching element D15 receives the third control signal.
  • the notch module 250 includes a thirty-sixth inductor L36, a forty-fifth capacitor C45, and a nineteenth resistor R19.
  • the first end of the thirty-sixth inductor L36 is connected to the optional filtering module 230 through the second switching element D16, the second end is connected to the first end of the forty-fifth capacitor C45; the second end of the forty-fifth capacitor C45 is grounded;
  • the first end of the nineteenth resistor R19 is connected to the first end of the thirty-sixth inductor L36, and the second end is connected to the second end of the forty-fifth capacitor C45.
  • the second switching element D16 receives the fourth control signal.
  • the filter circuit 200 operates in the RF section.
  • the switching elements D11-D16 in the figure are PIN diodes, and may also be Schottky diodes, and R11-R17 are used to protect the switching elements D11-D16.
  • FIG. 12 is a frequency response of the filter circuit 200 when the third control signal and the fourth control signal are both low.
  • the frequency of the m1 point in the figure is 527. MHz, the corresponding amplitude frequency response is -2.668dB; the frequency of m2 point is 620
  • the corresponding amplitude-frequency response is -1.7910dB
  • the frequency of m3 is 310MHz, the corresponding amplitude-frequency response is -2.484dB
  • the frequency of m4 is 1.054GHz, and the corresponding amplitude-frequency response is -52.205dB.
  • the filter circuit 200 has a pass band of 310-527 MHz and is used to suppress the second harmonic of 310 MHz and above.
  • FIG. 13 is a frequency response of the filter circuit 200 when the third control signal is at a high level and the fourth control signal is at a low level.
  • the frequency of the m1 point in the figure is 204. MHz, the corresponding amplitude frequency response is -1.459dB; the frequency of m2 point is 408
  • the filter circuit 200 has a pass band of 204-310 MHz and is used to suppress the second harmonic of 204 MHz and above.
  • the filter circuit 200 has a pass band of 136-204 MHz and is used to suppress the second harmonic of 136 MHz and above.
  • the cutoff frequency of the filter circuit 200 is changed to achieve harmonic suppression of different frequency bands. Adding a notch module can improve the non-passband rejection characteristics of the filter circuit, and a better frequency response can be obtained by using fewer optional connection filter components.
  • the switching element is a diode, a switching transistor, a field effect transistor or a switching chip capable of receiving a control signal and switching between conducting and non-conducting under control of the control signal.
  • the switching element is preferably a PIN diode or a Schottky diode. This embodiment can be combined with any of the embodiments of the filter circuit of the present invention.
  • the first embodiment of the radio frequency anti-interference circuit of the present invention includes: a filter circuit 310 and an amplifier 320 connected in sequence, wherein the filter circuit 310 is the filter described in any one embodiment and possible combinations of the filter circuit of the present invention.
  • the circuit will not be described here.
  • the specific circuit architecture and component parameter selection of filter circuit 310 is determined based on the actual input signal and filtering requirements. Due to the insertion loss of the filter circuit 310, it is generally desirable for the amplifier 320 to amplify the filtered signal. The signal is filtered by filter circuit 310 and sent to amplifier 320 for amplification.
  • the first embodiment of the radio frequency signal generating circuit of the present invention includes: a radio frequency signal generator 410 and a filter circuit 420 connected in sequence, wherein the filter circuit 420 is any one of the embodiments and possible combinations of the filter circuit of the present invention.
  • the described filter circuit will not be described here.
  • the specific circuit architecture and component parameter selection of filter circuit 420 is determined based on the signal and filtering requirements generated by RF signal generator 410.
  • the radio frequency signal generated by the radio frequency signal generator 410 is filtered by the filter circuit 420 and output.

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  • Engineering & Computer Science (AREA)
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Abstract

La présente invention concerne un circuit filtrant (100, 200, 310, 420), un circuit anti-interférence de radiofréquence et un circuit de génération de signaux RF. Le circuit filtrant (100, 200, 310, 420) comporte au moins un module de filtrage (1, 2, 110, 120, 130, 10, 20, 30, 40, 4, 210, 220, 230), dont un est un module de filtrage facultatif (1, 120, 130, 10, 20, 30, 40, 4, 220, 230). Le module de filtrage facultatif (1, 120, 130, 10, 20, 30, 40, 4, 220, 230) au moins un élément de filtre de base (11) et au moins un élément de filtre à connexion facultative (12). L'élément de filtre de base (11) est connecté à un autre module de filtrage ou des extrémités d'entrée/sortie du circuit filtrant et l'élément de filtre apte à une connexion facultative (12) est connecté à l'élément de filtre de base (11) à travers un élément de commutateur(13), l'élément de filtre à connexion facultative (12) étant un condensateur, une bobine d'induction , une ligne de transmission, un microruban ou une cavité résonante. L'élément de commutateur (13) reçoit un signal de commande, et sous le contrôle du signal de commande entraîne la connexion ou la déconnexion électrique de l'élément filtre à connexion facultative (12) et de l'élément de filtre de base (11), et la modification d'une fréquence de coupure du circuit filtrant (100, 200, 310, 420) lorsque les deux sont connectées électriquement.
PCT/CN2016/073276 2016-02-03 2016-02-03 Circuit filtrant, circuit anti-interférence de radiofréquence et circuit de génération de signaux rf WO2017132856A1 (fr)

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CN113630116B (zh) * 2020-05-08 2024-07-09 广州海格通信集团股份有限公司 锁相环反馈电路、锁相环电路和对讲通信设备

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