CN110677139A - Numerical control band-pass filtering module - Google Patents
Numerical control band-pass filtering module Download PDFInfo
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- CN110677139A CN110677139A CN201910910510.5A CN201910910510A CN110677139A CN 110677139 A CN110677139 A CN 110677139A CN 201910910510 A CN201910910510 A CN 201910910510A CN 110677139 A CN110677139 A CN 110677139A
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- 230000017525 heat dissipation Effects 0.000 claims description 9
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H17/00—Networks using digital techniques
- H03H17/0045—Impedance matching networks
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H11/00—Networks using active elements
- H03H11/02—Multiple-port networks
- H03H11/28—Impedance matching networks
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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
Abstract
The embodiment of the invention provides a band-pass filtering module, which relates to the field of communication and comprises the following components: the circuit comprises a first resonance module, a second resonance module, a coupling circuit, a first switch diode array circuit module, a second switch diode array circuit module, a driving circuit and a control circuit. The radio frequency signal is input into a first resonance module, filtered by the first resonance module, the coupling circuit and the second resonance module, and output by the second resonance module. The control circuit converts the parallel control code into a control level, the first switch diode array circuit module and the second switch diode array circuit module are synchronously driven by the driving circuit, and then corresponding capacitors are connected into the resonant circuit.
Description
Technical Field
The invention relates to the field of communication, in particular to a numerical control band-pass filtering module.
Background
The traditional radio station adopts a fixed frequency communication mode to transmit information, and an ultrahigh frequency (UHF) radio station can have the condition that a plurality of radio stations work at the same position simultaneously in the actual use process, and when the plurality of radio stations receive and transmit simultaneously, signal interference exists between the plurality of radio stations.
Therefore, in order to increase the signal interference resistance of the radio station, a frequency selection filter and a high-power frequency hopping filter are added at the front end and the back end of the power amplifier. The frequency hopping filter is used for solving the problem of electromagnetic compatibility caused by simultaneous communication of a plurality of frequency hopping communication devices, and the communication capacity can be expanded from 4-5 existing anti-interference radio stations to 20 radio stations under the same condition.
Therefore, how to provide a digital bandpass filtering module, which can realize simultaneous transceiving of multiple radio stations without signal interference, is a great technical problem to be solved urgently by those skilled in the art.
Disclosure of Invention
In view of this, embodiments of the present invention provide a band-pass filtering module, which can implement simultaneous transceiving of multiple stations and does not have signal interference.
In order to achieve the above purpose, the embodiments of the present invention provide the following technical solutions:
a digitally controlled bandpass filtering module comprising: the circuit comprises a first resonance module, a second resonance module, a coupling circuit, a first switch diode array circuit module, a second switch diode array circuit module, a driving circuit and a control circuit;
the control circuit is connected with the drive circuit, converts the received parallel control code into a control level and sends the control level to the drive circuit;
the driving circuit is connected with the first switch diode array circuit module and the second switch diode array circuit module, the first switch diode array circuit module connects a capacitor corresponding to the control level in the first switch diode array circuit module with the first resonance module based on the control level, and the second switch diode array circuit module connects a capacitor corresponding to the control level in the second switch diode array circuit module with the second resonance module based on the control level;
the first resonance module and the second resonance module are both connected with the coupling circuit, radio frequency signals are input into the first resonance module, and are output by the second resonance module after being filtered by the first resonance module, the coupling circuit and the second resonance module.
Optionally, the first resonance module includes a first impedance matching circuit and a first resonance circuit, the second resonance module includes a second impedance matching circuit and a second resonance circuit, the first switched diode array circuit module includes a first capacitor array and a first switch group, and the second switched diode array circuit module includes a second capacitor array and a second switch group;
the driving circuit is connected with the first switch group and the second switch group so as to enable the first switch group and the second switch group to carry out switching operation based on the control level;
the first capacitor array is connected with the first switch group and the first resonant circuit, and corresponding capacitors in the first capacitor array are connected with the first resonant circuit based on the switching action of the first switch group;
the second capacitor array is connected with the second switch group and the second resonant circuit, and corresponding capacitors in the second capacitor array are connected with the second resonant circuit based on the switching action of the second switch group;
the first impedance matching circuit is connected with the first resonance circuit and the first capacitor array respectively, the second impedance matching circuit is connected with the second resonance circuit and the second capacitor array respectively, the first resonance circuit and the second resonance circuit are both connected with the coupling circuit, radio-frequency signals are input into the first resonance circuit and the first capacitor array through the first impedance matching circuit, are input into the second resonance circuit and the second capacitor array after primary filtering, and are output by the second impedance matching circuit after secondary filtering.
Optionally, the first switch group and the second switch group include a plurality of switch diodes, and the switch diodes are switch diodes having withstand voltage higher than a first threshold, resistance smaller than a second threshold, and switching speed greater than a third threshold.
Optionally, the driving circuit includes a CMOS transistor, and the CMOS transistor is a CMOS triode having a current resistance higher than a fourth threshold, a withstand voltage higher than a fifth threshold, and a frequency modulation speed higher than a sixth threshold.
Optionally, the first resonant circuit and the second resonant circuit include resonant inductors, and the resonant inductors are inductors of wires with air-core coils and silver-plated copper wires.
Optionally, the heat dissipation module further comprises a shell and a heat dissipation component, wherein the heat dissipation component is adjacent to the shell.
Optionally, the housing includes a first housing and a second housing, the first impedance matching circuit, the second impedance matching circuit, the first resonant circuit, the second resonant circuit, the coupling circuit, the first capacitor array, the second capacitor array, the first switch group, the second switch group, and the driving circuit are disposed in the first housing, and the control circuit is disposed in the second housing.
Optionally, the input impedance and the output impedance of the first impedance matching circuit and the second impedance matching circuit are 50 ohms.
Based on the above technical solution, an embodiment of the present invention provides a band-pass filtering module, which relates to the field of communications, and includes: the circuit comprises a first resonance module, a second resonance module, a coupling circuit, a first switch diode array circuit module, a second switch diode array circuit module, a driving circuit and a control circuit. The radio frequency signal is input into a first resonance module, filtered by the first resonance module, the coupling circuit and the second resonance module, and output by the second resonance module. The control circuit converts the parallel control code into a control level, the first switch diode array circuit module and the second switch diode array circuit module are synchronously driven by the driving circuit, and then corresponding capacitors are connected into the resonant circuit.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a digital band-pass filter module according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a digital band-pass filter module according to an embodiment of the present invention;
fig. 3 is a schematic diagram illustrating an operating principle of a digital band-pass filter module according to an embodiment of the present invention;
fig. 4 is a circuit diagram of a specific implementation of a first impedance matching circuit, a first resonant circuit, a second impedance matching circuit, a second resonant circuit, and a coupling circuit according to an embodiment of the present invention.
Detailed Description
Referring to fig. 1, fig. 1 is a schematic structural diagram of a digital band-pass filter module according to an embodiment of the present invention, where the digital band-pass filter module includes: a first resonance module 11, a second resonance module 12, a coupling circuit 13, a first switched diode array circuit module 14, a second switched diode array circuit module 15, a drive circuit 16, and a control circuit 17.
The connection relation of each circuit is as follows:
the control circuit 17 is connected to the driving circuit 16, converts the received parallel control code into a control level, and sends the control level to the driving circuit 16.
The driving circuit 16 is connected to the first switch diode array circuit module 14 and the second switch diode array circuit module 15, the first switch diode array circuit module 15 connects the capacitor corresponding to the control level in the first switch diode array circuit module 15 to the first resonance module 11 based on the control level, and the second switch diode array circuit module 15 connects the capacitor corresponding to the control level in the second switch diode array circuit module 15 to the second resonance module 12 based on the control level.
The first resonance module 11 and the second resonance module 12 are both connected to the coupling circuit 13, and a radio frequency signal is input to the first resonance module 11, filtered by the first resonance module 11, the coupling circuit 13, and the second resonance module 12, and then output by the second resonance module 12.
Therefore, according to the digital control band-pass filter module provided by the embodiment of the invention, different capacitance combinations correspond to different resonance frequencies, so that the purpose of controlling the center frequency jump of the band-pass filter through the control code is achieved, multiple radio stations can be simultaneously transmitted and received, and no signal interference exists.
With reference to fig. 1, on the basis of the above-mentioned embodiment, as shown in fig. 2, this embodiment provides a specific implementation structure of the first resonant module 11, the second resonant module 12, the first switching diode array circuit module 14, and the second switching diode array circuit module 15.
The first resonance module 11 includes a first impedance matching circuit 111 and a first resonance circuit 112, the second resonance module 12 includes a second impedance matching circuit 121 and a second resonance circuit 122, the first switch diode array circuit module 14 includes a first capacitor array 141 and a first switch group 142, and the second switch diode array circuit module 15 includes a second capacitor array 151 and a second switch group 152.
The driving circuit 16 is connected to the first switch group 142 and the second switch group 152, so that the first switch group 142 and the second switch group 152 perform a switching operation based on the control level.
The first capacitor array 141 is connected to the first switch group 142 and the first resonant circuit 112, and corresponding capacitors in the first capacitor array 141 are connected to the first resonant circuit 112 based on a switching operation of the first switch group 142.
The second capacitor array 151 is connected to the second switch group 152 and the second resonant circuit 122, and capacitors corresponding to the second capacitor array 151 are connected to the second resonant circuit 122 based on the switching operation of the second switch group 152.
The first impedance matching circuit 111 is connected to the first resonant circuit 112 and the first capacitor array 141, the second impedance matching circuit 121 is connected to the second resonant circuit 122 and the second capacitor array 151, the first resonant circuit 112 and the second resonant circuit 122 are connected to the coupling circuit 13, and after a radio frequency signal is input to the first resonant circuit 112 and the first capacitor array 141 through the first impedance matching circuit 111, the radio frequency signal is input to the second resonant circuit 122 and the second capacitor array 151, and after being filtered, the radio frequency signal is output by the second impedance matching circuit 121.
Schematically, the signal trend in the digital control band-pass filtering module is as follows:
the radio frequency signal is input from the port of the impedance matcher of one resonance module, filtered by a double resonance loop formed by the resonance inductor and the capacitor bank array, and finally output from the port of the impedance matcher of the other resonance module. The low frequency input consists of a low voltage control level, a high voltage control level and a parallel control code. The MCU digital control module converts the parallel control code into a control level, and drives the PIN diode switch light group through the high-frequency drive circuit, so that the corresponding capacitor array is connected into the resonant circuit. Because different capacitor array combinations correspond to different resonant frequencies, the purpose of controlling the hopping of the center frequency of the frequency hopping filter by the control code is achieved.
In this embodiment, the resonant module and the capacitor array may form 2n resonant frequency combinations (where n is the number of parallel code bits, generally 8 bits), that is, 2n band-pass filter bands with adjustable frequency may be selected, so that the frequency step of frequency hopping can be small.
In combination with the structural relationship of the above numerical control band-pass filtering module, as shown in fig. 3, the working principle of this embodiment is as follows:
firstly, the MCU reads an externally input control code and converts the externally input control code into a control level, and the control level drives the switch and the closing of a PIN diode in an MOSfet loop through the matching of a driver and a high voltage level and a low voltage level. The PIN diode, the capacitor array and capacitors distributed among the PCBs form a total resonant capacitor, and the resonant capacitor and fixed inductors in the resonant circuit form a resonant loop to filter the radio frequency input signal. The DC blocking inductor is used for effectively isolating the low-frequency control signal from entering the resonant circuit.
Specifically, in this embodiment, the first switch group and the second switch group include a plurality of switch diodes, and the switch diodes are switch diodes having withstand voltage higher than a first threshold value, resistance smaller than a second threshold value, and switching speed greater than a third threshold value. Namely, the switching diode with high withstand voltage, small internal resistance and high switching speed is selected for the type selection of the switching diode.
In addition, the driving circuit in this embodiment includes a CMOS transistor, and the CMOS transistor is a CMOS transistor having a current resistance higher than a fourth threshold, a withstand voltage higher than a fifth threshold, and a frequency modulation speed greater than a sixth threshold. Namely, because the power of the filter is large, the high-voltage driver needs to select a CMOS transistor which is current-resistant, has a large voltage and a high frequency hopping speed according to the requirement.
Further, in order to reduce the insertion loss of the filter, the resonant inductor is an air coil, the conducting wire is made of silver-plated copper wires, and meanwhile, silver plating treatment is carried out on the inner wall of the aluminum alloy. For example, the first resonant circuit and the second resonant circuit include resonant inductors, which are inductors of wires having an air-core coil and a silver-plated copper wire.
In addition, the numerical control band-pass filter module provided by the embodiment of the invention further comprises a shell and a heat dissipation component, wherein the heat dissipation component is arranged adjacent to the shell, so that the heat dissipation capacity of the numerical control band-pass filter module is further improved, and besides, the heat dissipation component can be filled with heat conduction materials.
It should be mentioned that, in this embodiment, the housing includes a first housing and a second housing, the first impedance matching circuit, the second impedance matching circuit, the first resonant circuit, the second resonant circuit, the coupling circuit, the first capacitor array, the second capacitor array, the first switch group, the second switch group and the driving circuit are disposed in the first housing, and the control circuit is disposed in the second housing.
Namely, the analog circuit part and the digital control circuit part of the resonance module circuit, the switch diode array circuit and the high-voltage driver are physically isolated in space by using a modular circuit structure design and are respectively arranged in different closed metal cavities, so that the electromagnetic interference among internal electronic components can be effectively prevented.
Wherein the input impedance and the output impedance of the first impedance matching circuit and the second impedance matching circuit are 50 ohms.
On the basis of the above embodiments, as shown in fig. 4, the present embodiment provides a specific implementation circuit of the first impedance matching circuit 111, the first resonant circuit 112, the second impedance matching circuit 121, the second resonant circuit 122, and the coupling circuit 13.
The first impedance matching circuit 111 includes an inductor L1 and an inductor L2, the second impedance matching circuit 121 includes an inductor L11 and an inductor L22, the first resonant circuit 112 includes an inductor L3 and an inductor L3, and the second resonant circuit 122 includes an inductor L33 and an inductor L44. The coupling circuit 13 includes an inductance L5. The input terminal of the first impedance matching circuit 111 is used as an RF input port, and the output terminal of the second impedance matching circuit 121 is used as an RF output port.
To sum up, the embodiment of the present invention provides a band-pass filtering module, which relates to the field of communications, and includes: the circuit comprises a first resonance module, a second resonance module, a coupling circuit, a first switch diode array circuit module, a second switch diode array circuit module, a driving circuit and a control circuit. The radio frequency signal is input into a first resonance module, filtered by the first resonance module, the coupling circuit and the second resonance module, and output by the second resonance module. The control circuit converts the parallel control code into a control level, the first switch diode array circuit module and the second switch diode array circuit module are synchronously driven by the driving circuit, and then corresponding capacitors are connected into the resonant circuit.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative components and steps have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
The steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. A software module may reside in Random Access Memory (RAM), memory, Read Only Memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (8)
1. A digitally controlled bandpass filter module, comprising: the circuit comprises a first resonance module, a second resonance module, a coupling circuit, a first switch diode array circuit module, a second switch diode array circuit module, a driving circuit and a control circuit;
the control circuit is connected with the drive circuit, converts the received parallel control code into a control level and sends the control level to the drive circuit;
the driving circuit is connected with the first switch diode array circuit module and the second switch diode array circuit module, the first switch diode array circuit module connects a capacitor corresponding to the control level in the first switch diode array circuit module with the first resonance module based on the control level, and the second switch diode array circuit module connects a capacitor corresponding to the control level in the second switch diode array circuit module with the second resonance module based on the control level;
the first resonance module and the second resonance module are both connected with the coupling circuit, radio frequency signals are input into the first resonance module, and are output by the second resonance module after being filtered by the first resonance module, the coupling circuit and the second resonance module.
2. The digitally controlled bandpass filter module according to claim 1, wherein the first resonant module comprises a first impedance matching circuit and a first resonant circuit, the second resonant module comprises a second impedance matching circuit and a second resonant circuit, the first switched diode array circuit module comprises a first capacitor array and a first switch bank, and the second switched diode array circuit module comprises a second capacitor array and a second switch bank;
the driving circuit is connected with the first switch group and the second switch group so as to enable the first switch group and the second switch group to carry out switching operation based on the control level;
the first capacitor array is connected with the first switch group and the first resonant circuit, and corresponding capacitors in the first capacitor array are connected with the first resonant circuit based on the switching action of the first switch group;
the second capacitor array is connected with the second switch group and the second resonant circuit, and corresponding capacitors in the second capacitor array are connected with the second resonant circuit based on the switching action of the second switch group;
the first impedance matching circuit is connected with the first resonance circuit and the first capacitor array respectively, the second impedance matching circuit is connected with the second resonance circuit and the second capacitor array respectively, the first resonance circuit and the second resonance circuit are both connected with the coupling circuit, radio-frequency signals are input into the first resonance circuit and the first capacitor array through the first impedance matching circuit, are input into the second resonance circuit and the second capacitor array after primary filtering, and are output by the second impedance matching circuit after secondary filtering.
3. The digitally controlled bandpass filter module according to claim 1, wherein the first switch set and the second switch set comprise a plurality of switch diodes, and the switch diodes are switch diodes having a withstand voltage higher than a first threshold, a resistance smaller than a second threshold, and a switching speed greater than a third threshold.
4. The digitally controlled bandpass filter module according to claim 1, wherein the driving circuit comprises a CMOS transistor, and the CMOS transistor has a current resistance higher than a fourth threshold, a withstand voltage higher than a fifth threshold, and a frequency modulation speed higher than a sixth threshold.
5. The digitally controlled bandpass filter module according to claim 1 wherein the first resonant circuit and the second resonant circuit comprise resonant inductors of a wire with an air coil, silver coated copper wire.
6. The digitally controlled bandpass filter module according to claim 1, further comprising a housing and a heat dissipation component, the heat dissipation component being disposed adjacent to the housing.
7. The digitally controlled bandpass filter module according to claim 6 wherein the housing comprises a first housing and a second housing, the first impedance matching circuit, the second impedance matching circuit, the first resonant circuit, the second resonant circuit, the coupling circuit, the first capacitive array, the second capacitive array, the first switch set, the second switch set and the drive circuit being disposed within the first housing, the control circuit being disposed within the second housing.
8. The digitally controlled bandpass filter module according to claim 1, wherein the input and output impedances of the first and second impedance matching circuits are 50 ohms.
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| CN201910910510.5A CN110677139A (en) | 2019-09-25 | 2019-09-25 | Numerical control band-pass filtering module |
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| CN201910910510.5A CN110677139A (en) | 2019-09-25 | 2019-09-25 | Numerical control band-pass filtering module |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112104339A (en) * | 2020-08-28 | 2020-12-18 | 电子科技大学 | Smoothing filtering method suitable for signals with jumping edges |
| CN113014222A (en) * | 2021-04-26 | 2021-06-22 | 哈尔滨海能达科技有限公司 | Band-pass filter circuit and electronic equipment |
| CN113341361A (en) * | 2021-06-04 | 2021-09-03 | 江苏海明医疗器械有限公司 | Electronic equipment rectification device, system and method |
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| CN105340176A (en) * | 2013-05-28 | 2016-02-17 | 纽伦斯股份有限公司 | Signal handling apparatus for improving linearity of radio frequency circuits |
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| US20120286892A1 (en) * | 2010-12-10 | 2012-11-15 | Wispry, Inc. | Mems tunable notch filter frequency automatic control loop systems and methods |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112104339A (en) * | 2020-08-28 | 2020-12-18 | 电子科技大学 | Smoothing filtering method suitable for signals with jumping edges |
| CN113014222A (en) * | 2021-04-26 | 2021-06-22 | 哈尔滨海能达科技有限公司 | Band-pass filter circuit and electronic equipment |
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Application publication date: 20200110 |