CN112073031A - Parameter-configurable active filter circuit - Google Patents
Parameter-configurable active filter circuit Download PDFInfo
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- CN112073031A CN112073031A CN202010937678.8A CN202010937678A CN112073031A CN 112073031 A CN112073031 A CN 112073031A CN 202010937678 A CN202010937678 A CN 202010937678A CN 112073031 A CN112073031 A CN 112073031A
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- 230000006854 communication Effects 0.000 claims abstract description 23
- 238000001514 detection method Methods 0.000 claims abstract description 18
- 239000003990 capacitor Substances 0.000 claims description 4
- 238000010586 diagram Methods 0.000 description 7
- 238000001914 filtration Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
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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
- H03H11/04—Frequency selective two-port networks
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Abstract
The invention discloses a broadband, frequency point and gain configurable active filter circuit, which comprises a bandwidth, frequency point and gain configurable active filter circuit, an MCU control circuit, a noise detection circuit and a signal receiving end, wherein the problem that the current communication device cannot communicate due to randomness and sudden inherent characteristics of noise in the communication process is solved by designing a self-switching frequency point, and a plurality of single-order bandwidths, frequency points and gain configurable active filter circuits can be cascaded to form the multi-order bandwidths, frequency points and gain configurable active filter circuit, so that a wider broadband and equal-number frequency points are configured, and the gain range is expanded.
Description
Technical Field
The invention relates to the technical field of communication, in particular to a parameter-configurable active filter circuit.
Background
In a communication system, there are inherent characteristics of randomness and burstiness of noise, which causes a communication device to have poor communication due to inherent characteristics during communication.
The filter circuit design part in the current communication system adopts the natural frequency design, and the method can not be used for communication in a line with larger noise; part of the filter circuit is designed to have a wide bandwidth, and noise signals near the communication frequency by using the method can interfere with baseband signal demodulation.
Disclosure of Invention
In view of the above-mentioned drawbacks and deficiencies of the prior art, an object of the present invention is to provide an active filter circuit with configurable parameters, which can solve the problem that the current communication device cannot communicate due to the randomness and the inherent burstiness of noise during communication through its own switching frequency points, and is suitable for a line with large noise and wide noise spectrum range, and has low cost and convenient operation.
In order to achieve the above object, the present invention provides a parameter-configurable active filter circuit, which comprises a bandwidth, a frequency point, a gain-configurable active filter circuit, an MCU control circuit, a noise detection circuit, and a signal receiving terminal, wherein:
the signal receiving end is used for receiving the noise signal in real time and transmitting the signal to the noise detection circuit;
the noise detection circuit is used for detecting the noise of the receiving end in real time and transmitting the detection result to the MCU control circuit;
the MCU control circuit judges whether the current noise is an optimal value under the current active filtering channel frequency according to the detection result transmitted by the noise detection circuit, and if the current noise is not the optimal value, the current filtering channel is kept;
the active filter circuit with configurable bandwidth, frequency point and gain is used for keeping and switching the communication channel, and if the MCU judges that the noise is an optimal value under the current active filter channel frequency, the active filter circuit with configurable bandwidth, frequency point and gain is kept as the current communication channel; if the MCU judges that the noise is not an optimal value under the current active filter channel frequency, the bandwidth, the frequency point and the gain can be configured with the active filter circuit and switched to a frequency channel corresponding to the current better communication through a switching control command.
The active filter circuit with configurable bandwidth, frequency point and gain is designed based on an MFB framework active filter structure and comprises an operational amplifier A1, resistors R1, R2 and R3, and capacitors C1 and C2. After Ui has input, Uo feeds back to the input end through two feedback branches C1 and R3, and the single path is made to be equivalent to 'virtual short' and 'virtual short', where C1 is equal to C2, and the quality factor Q, the central frequency point F, and the gain G of the framework are formula-1.
The bandwidth, frequency point and gain can be configured with an active filter circuit, and on the basis of an MFB framework active filter, analog switches K1, K2, K3, K4 and K5 are added, so that the quality factor Q, the center frequency F and the gain G of the MFB framework are changed, CH1 and CH2 & CHN are multiple channels, wherein N is the N-th power of 2 (N & lt0 & gt, 1 & ltn & gt), COM is a common output end, and CMD is a switching control pin (the number of which is N).
The analog switch adds a switching channel, and is used for switching the resistance and the capacitance of the MFB framework through a CMD bus, wherein R1 can be switched to R11 and R12. cndot. R1N (wherein N is 2 to the power of N), R2 can be switched to R21 and R22. cndot. R2N, R3 can be switched to R31 and R32. cndot. R3N, C1 can be switched to C11 and C12. cndot. C1N, and C2 can be switched to C21 and C22. cndot. C2N.
The bandwidth, frequency point and gain configurable active filter circuit as an integral structure F1 can be expanded into N single-order bandwidths and frequency points of F1 and F2. DEG. FN, and a multi-order bandwidth, frequency point and gain configurable active filter circuit formed by cascading the gain configurable active filter circuit can be used for configuring wider broadband and more frequency points and expanding the gain range.
The invention has the beneficial effects that:
1. the problem that the communication cannot be performed due to the randomness and the burst inherent characteristics of noise in the communication process of the current communication device is solved through the self-contained switching frequency point, and the method is suitable for the situation that the noise is large and the current filtering channel is kept.
2. The multi-order bandwidth, frequency point and gain configurable active filter circuit formed by cascading a plurality of single-order bandwidth, frequency point and gain configurable active filter circuits can configure wider broadband and equal-number frequency points and enlarge the gain range.
3. And a plurality of equipment systems are not needed, so that the cost is lower and the operation is convenient.
Drawings
FIG. 1 is a block diagram of a parameter configurable active filter circuit according to the present invention.
Fig. 2 is a circuit structure of an MFB architecture filter with parameter configurable active filter circuits according to the present invention.
FIG. 3 is a diagram of an analog switch with configurable active filter circuit parameters according to the present invention.
Fig. 4 is a structural diagram of a single-order bandwidth, frequency point and gain configurable active filter circuit of the parameter configurable active filter circuit of the invention.
FIG. 5 is a diagram of a multi-order bandwidth, frequency point, gain configurable active filter circuit structure of the parameter configurable active filter circuit of the present invention.
Detailed Description
The invention is further described in detail below with reference to the accompanying drawings.
The general block diagram of the design is shown in fig. 1, and the design comprises a core bandwidth, a frequency point, a gain configurable active filter circuit, an MCU control circuit, a noise detection circuit and a signal receiving end part.
The noise detection part detects the noise of the receiving end in real time, and transmits the detection result to the MCU control circuit, and the MCU control circuit judges whether the current noise is the optimal value under the current active filtering channel frequency according to the detection result. If the channel is the optimal value, the bandwidth, the frequency point and the gain can be controlled by switching the control command and the active filter circuit can be configured to be kept as the current channel; if the difference value is judged, the better communication frequency is judged according to the detection result, and the bandwidth, the frequency point and the gain can be configured with the active filter circuit and switched into the corresponding frequency channel through the switching control command.
As shown in fig. 2, the core of the filter circuit structure is an operational amplifier formed by a1, and after resistors R1, R2, and R3 and capacitors C1 and C2 are used, Ui is input, Uo is fed back to an input end through two feedback branches of a capacitor C1 and a resistor R3, and the single circuit is equivalent to "virtual short" and "virtual short", where C1 is C2 is C, and a quality factor Q, a center frequency point F, and a gain G of the filter structure are formula-1.
On the basis of the active filtering of the MFB framework, an analog switch switching channel is added to switch the resistance and the capacitance of the MFB framework, so that the quality factor Q, the central frequency F and the gain G of the MFB framework are changed. The analog switch structure is shown in fig. 3, where CH1 and CH2 · CHN are multiple channels, where N is the N-th power of 2 (N ═ 0,1 · · · N), COM is the common output, and CMD is the switching control pin (N in number).
An MFB architecture is combined with an analog switch to form a single-order active filter circuit with configurable bandwidth, frequency point and gain, and the structure is as shown in fig. 4, on the basis of fig. 2, R1 can be switched to R11 and R12 · R1N (where N is the N-th power of 2), R2 can be switched to R21 and R22 · R2N, R3 can be switched to R31 and R32 · R3N, C1 can be switched to C11 and C12 · C1N, and C2 can be switched to C21 and C22 · C2N. The required R1, R2, R3, C1, C2 are calculated by equation-1 so that the active filter bandwidth, frequency, gain shown in fig. 4 are switched by the CMD bus.
On the basis of fig. 4, a structure diagram of a single-order bandwidth, frequency point and gain configurable active filter circuit of fig. 4 is packaged into an overall structure F1, the packaging structure can be expanded to form a multi-order bandwidth, frequency point and gain configurable active filter circuit as shown in fig. 5, the bandwidth, frequency point and gain configurable active filter circuit in the diagram is formed by cascading N single-order bandwidths, frequency points and gain configurable active filter circuits of F1 and F2 · · · · FN, each F1 structure is formed by fig. 4 to form a multi-order bandwidth, frequency point and gain configurable active filter circuit, and the cascading situation can configure wider bandwidth, more frequency points and wider gain range.
Claims (5)
1. The utility model provides a parameter can dispose active filter circuit, its characterized in that, this circuit contains bandwidth, frequency point, gain can dispose active filter circuit, MCU control circuit, noise detection circuit, signal receiving terminal, wherein:
the signal receiving end is used for receiving the noise signal in real time and transmitting the signal to the noise detection circuit;
the noise detection circuit is used for detecting the noise of the receiving end in real time and transmitting the detection result to the MCU control circuit;
the MCU control circuit judges whether the current noise is an optimal value under the current active filter channel frequency according to the detection result transmitted by the noise detection circuit, and judges the current frequency with better communication if the current noise is not the optimal value;
the active filter circuit with configurable bandwidth, frequency point and gain is used for keeping and switching the communication channel, and if the MCU judges that the noise is an optimal value under the current active filter channel frequency, the active filter circuit with configurable bandwidth, frequency point and gain is kept as the current communication channel; if the MCU judges that the noise is not an optimal value under the current active filter channel frequency, the bandwidth, the frequency point and the gain can be configured with the active filter circuit and switched to a frequency channel corresponding to the current better communication through a switching control command.
2. The circuit of claim 1, wherein the bandwidth, frequency and gain configurable active filter circuit is designed based on an MFB architecture active filter structure, and the MFB architecture active filter structure comprises an operational amplifier a1, resistors R1, R2 and R3, and capacitors C1 and C2.
3. The circuit of claim 2, wherein analog switches K1, K2, K3, K4 and K5 are added to the circuit based on an MFB-architecture active filter.
4. The parameter configurable active filter circuit according to claim 2, wherein the analog switch adds a switching channel for switching the resistance and capacitance of the MFB architecture through the CMD bus, R1 can be switched to R11, R12 · R1N (where N is the N-th power of 2), R2 can be switched to R21, R22 · R2N, R3 can be switched to R31, R32 · R3N, C1 can be switched to C11, C12 · C1N, and C2 can be switched to C21, C22 · C2N.
5. The parameter-configurable active filter circuit according to claim 3, wherein the bandwidth-configurable active filter circuit, the frequency-configurable active filter circuit, and the gain-configurable active filter circuit as an integral structure F1 can be expanded to N single-order bandwidths, frequency points, and gain-configurable active filter circuits of F1 and F2 · FN, and can be used to configure a wider bandwidth, frequency points, and gain-configurable active filter circuit with equal frequency points, and to expand a gain range.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010937678.8A CN112073031A (en) | 2020-09-07 | 2020-09-07 | Parameter-configurable active filter circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010937678.8A CN112073031A (en) | 2020-09-07 | 2020-09-07 | Parameter-configurable active filter circuit |
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| CN112073031A true CN112073031A (en) | 2020-12-11 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203632629U (en) * | 2013-12-25 | 2014-06-04 | 北京万集科技股份有限公司 | Intermediate-frequency filter circuit having frequency adaptivity |
| CN106100657A (en) * | 2016-05-24 | 2016-11-09 | 东南大学 | A kind of automatically adjusted obstruction inhibiting rate receiving radio frequency front end based on aliasing filtering |
| CN206226389U (en) * | 2016-11-21 | 2017-06-06 | 国家电网公司 | The frequency selection circuit that active RLC narrow-band pass filters are combined with Schmidt trigger |
| CN107147605A (en) * | 2017-04-28 | 2017-09-08 | 深圳芯珑电子技术有限公司 | The OFDM means of communication and system that a kind of wide and narrow strip is combined |
| CN110873552A (en) * | 2018-08-31 | 2020-03-10 | 上海微电子装备（集团）股份有限公司 | Laser interferometer receiver |
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2020
- 2020-09-07 CN CN202010937678.8A patent/CN112073031A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203632629U (en) * | 2013-12-25 | 2014-06-04 | 北京万集科技股份有限公司 | Intermediate-frequency filter circuit having frequency adaptivity |
| CN106100657A (en) * | 2016-05-24 | 2016-11-09 | 东南大学 | A kind of automatically adjusted obstruction inhibiting rate receiving radio frequency front end based on aliasing filtering |
| CN206226389U (en) * | 2016-11-21 | 2017-06-06 | 国家电网公司 | The frequency selection circuit that active RLC narrow-band pass filters are combined with Schmidt trigger |
| CN107147605A (en) * | 2017-04-28 | 2017-09-08 | 深圳芯珑电子技术有限公司 | The OFDM means of communication and system that a kind of wide and narrow strip is combined |
| CN110873552A (en) * | 2018-08-31 | 2020-03-10 | 上海微电子装备（集团）股份有限公司 | Laser interferometer receiver |
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Application publication date: 20201211 |