CN204707103U - Configurable low pass filter and the multiple band pass filter that is suitable for - Google Patents
Configurable low pass filter and the multiple band pass filter that is suitable for Download PDFInfo
- Publication number
- CN204707103U CN204707103U CN201520512006.7U CN201520512006U CN204707103U CN 204707103 U CN204707103 U CN 204707103U CN 201520512006 U CN201520512006 U CN 201520512006U CN 204707103 U CN204707103 U CN 204707103U
- Authority
- CN
- China
- Prior art keywords
- filter unit
- pass filter
- unit
- controlled switch
- filter
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Networks Using Active Elements (AREA)
Abstract
The utility model provide a kind of configurable low pass filter and the multiple band pass filter that is suitable for.Wherein, low pass filter comprises: the multiple filter units carrying out cascade according to the overall filter transfer function preset; Multiple controlled switch unit of the corresponding filter order between second level filter unit input to afterbody filter unit output.Described multiple band pass filter comprises: the configurable low pass filter of exponent number on I road; The Q road exponent number configurable low pass filter identical with I road; And be connected to each controlled switching circuit unit of the positive input terminal of I road low-pass filter unit and the negative output terminal of the positive output end of the positive output end of the negative output terminal of Q road low-pass filter unit, the negative input end being connected to I road low-pass filter unit and Q road low-pass filter unit, the positive input terminal being connected to Q road low-pass filter unit and I road low-pass filter unit, the negative input end being connected to Q road low-pass filter unit and I road low-pass filter unit.
Description
Technical field
The utility model relates to electronic filter field, particularly relate to a kind of configurable low pass filter and the multiple band pass filter that is suitable for.
Background technology
Transmitting chain and receiver can be all comprised in the equipment of connecting wireless network.Wherein, signal is launched by medium and low frequency up-conversion tremendously high frequency by transmitting chain.Receiver is that after signal is downconverted to medium and low frequency by high frequency, demodulation receives.In above-mentioned two processes, filter is needed to carry out filtering process to signal.But for transmitting chain and receiver, filter required is separately not identical.In prior art, man-to-man filtering is often adopted to configure.Along with the development of the communication technology, the requirement of chip opposite sum power consumption is also improving constantly, and the mode configuring filter is one to one unfavorable for the reduction of power consumption and cost.Therefore, need to improve existing filter.
Summary of the invention
The utility model embodiment provide a kind of configurable low pass filter and the multiple band pass filter that is suitable for, for solving the problem of filter circuit redundancy in prior art.
The utility model embodiment is by the following technical solutions:
First aspect, provides a kind of configurable low pass filter, comprising: multiple filter units with corresponding differential input end and output, and each described filter unit carries out cascade according to the filter transfer function preset; Second level filter unit input to afterbody filter unit output between, be symmetrical arranged multiple controlled switch unit of corresponding configurable exponent number; Described controlled switch unit based on received control signal to should give gating/disconnection.
Preferably, described filter unit comprises: differential operational amplifier, be serially connected in the resistance of the positive and negative input of described operational amplifier respectively, be connected across the electric capacity between the positive input terminal of described operational amplifier and negative output terminal, be connected across the electric capacity between the negative input end of described operational amplifier and positive output end.
Preferably, the structure of the adjacent two-stage of each described filter unit comprises: afterbody second order joint is the structure that leapfrogs, and second order joint at different levels is two binary filter structures before.
Preferably, between each described controlled switch unit input of being connected across multiple adjacent operational amplifier and output.
Preferably, each described filter unit adopts cascade system and quantity is Pyatyi, corresponding:
From the input of described differential signal, be arranged on the resistance R5 between the negative input end of first filter unit and the negative output terminal of second filter unit; Be arranged on the resistance R6 between the positive input terminal of first filter unit and the positive output end of second filter unit; Be arranged between the negative input end of second filter unit and the negative output terminal of the 3rd filter unit, to comprise controlled switch SW1 and resistance R9 controlled switch unit; Be arranged between the positive input terminal of second filter unit and the positive output end of the 3rd filter unit, to comprise controlled switch SW2 and resistance R10 controlled switch unit; Be arranged between the positive output end of second filter unit and the negative input end of the 3rd filter unit, to comprise controlled switch SW4 controlled switch unit; Be arranged between the negative output terminal of second filter unit and the positive input terminal of the 3rd filter unit, to comprise controlled switch SW5 controlled switch unit; Be arranged between the positive output end of the 4th filter unit and the negative input end of the 5th filter unit, to comprise controlled switch SW11 controlled switch unit; Be arranged between the negative output terminal of the 4th filter unit and the positive input terminal of the 5th filter unit, to comprise controlled switch SW12 controlled switch unit; Be arranged between the positive output end of second filter unit and the negative input end of the 5th filter unit, to comprise controlled switch SW3 controlled switch unit; Be arranged between the negative output terminal of second filter unit and the positive input terminal of the 5th filter unit, to comprise controlled switch SW6 controlled switch unit; Be connected with the positive output end of the 5th filter unit and controlled selection is connected the controlled switch unit of the negative input end of second filter unit or the negative input end of the 4th filter unit; Be connected with the negative output terminal of the 5th filter unit and controlled selection is connected the controlled switch unit of the positive input terminal of second filter unit or the positive input terminal of the 4th filter unit.
Second aspect, also provides a kind of configurable multiple band pass filter, comprising: be connected with the differential input signal on I road, as above arbitrary described configurable low pass filter of exponent number, be connected with the differential input signal on Q road, as above arbitrary described configurable low pass filter of exponent number, and be connected to the positive input terminal of low-pass filter unit on described I road and the negative output terminal of the low-pass filter unit on Q road, be connected to the positive output end of the negative input end of the low-pass filter unit on described I road and the low-pass filter unit on Q road, be connected to the positive output end of the positive input terminal of the low-pass filter unit on described Q road and the low-pass filter unit on I road, be connected to each controlled switching circuit unit of the frequency translation resistance of having connected of the negative output terminal of the negative input end of the low-pass filter unit on described Q road and the low-pass filter unit on I road.
As mentioned above, configurable low pass filter of the present utility model and the multiple band pass filter that is suitable for, there is following beneficial effect: by arranging controlled switch unit between each filter unit, according to transmitting chain and receiver need change filter patterns and exponent number, multistage configurable double mode filters solutions can be realized with single circuit, save the expense of circuit.
Accompanying drawing explanation
In order to be illustrated more clearly in the technical scheme in the utility model embodiment, be briefly described to the accompanying drawing used required in the description of the utility model embodiment below, apparently, accompanying drawing in the following describes is only embodiments more of the present utility model, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to the content of the utility model embodiment and these accompanying drawings.
Fig. 1 is the block diagram of an embodiment of configurable low pass filter of the present utility model.
Fig. 2 is the structural circuit figure of another embodiment of configurable low pass filter of the present utility model.
Fig. 3 is the block diagram of an embodiment of configurable multiple band pass filter of the present utility model.
Embodiment
The technical problem solved for making the utility model, the technical scheme of employing and the technique effect that reaches are clearly, be described in further detail below in conjunction with the technical scheme of accompanying drawing to the utility model embodiment, obviously, described embodiment is only the utility model part embodiment, instead of whole embodiments.Based on the embodiment in the utility model, those skilled in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the utility model protection.
As shown in Figure 1, the utility model provides a kind of configurable low pass filter.Described low pass filter comprises: multiple filter unit 11 and controlled switch unit 12.
Each described filter unit 11 has the output of the described differential signal after the input and output filtering receiving differential signal.Wherein, the connected mode of each described filter unit 11 carries out cascade according to the maximum order in the filter transfer function preset.Such as, described filter transfer function is 5 rank functions, then every one-level filter unit realizes an order polynomial in described filter transfer function or quadratic polynomial, each described filter unit is cascaded into the filter being 5 rank to the maximum, to realize the filtering requirements corresponding to described filter transfer function with two binary filter structure (Tow-Thomas) and/or the structure that leapfrogs (Leapfrog).
Preferably, as shown in Figure 2, described filter unit 11 comprises: differential operational amplifier, be serially connected in the resistance of the positive and negative input of described operational amplifier respectively, be connected across the electric capacity between the positive input terminal of described operational amplifier and negative output terminal, be connected across the electric capacity between the negative input end of described operational amplifier and positive output end.
Each described filter unit adopts active RC filter, and afterbody second order is Leapfrog structure, and second order at different levels is Tow-Thomas structure before.
Such as, as shown in Figure 2, from receiving differential signal, resistance R5 is set between the negative output terminal of the negative input end of first filter unit and second filter unit.Between the negative output terminal of the negative input end of second filter unit and the 3rd filter unit, resistance R9 is set.Between the negative output terminal of the negative input end of the 3rd filter unit and the 4th filter unit, resistance R13 is set.Between the positive output end of the negative input end of the 4th filter unit and the 5th filter unit, resistance R17 is set.The phase-inversion symmetric of each filter unit, is not described in detail in this.
In order to realize according to transmitting chain and receiver to the different filtering demands of signal, the controlled switch unit in described low pass filter can according to mode control signal ON/OFF.According to the described position of controlled switch unit between each filter unit, the structure of each controlled switch unit inside is not quite identical.
Between each input and each output of last filter unit of second filter unit, being symmetrical arranged correspondence can multiple controlled switch unit of exponent number of arrangement, between the input being connected across multiple adjacent operational amplifier and output.
Such as, as shown in Figure 2, each described filter unit adopts Pyatyi cascade.In order to described filter is configured to the low pass filter on optional three rank or five rank, self difference signal input part (V
iP, V
iN) start, the corresponding each controlled switch unit arranged is as follows successively:
Be arranged between the negative input end of second filter unit and the negative output terminal of the 3rd filter unit, to comprise controlled switch SW1 and resistance R9 controlled switch unit; Be arranged between the positive input terminal of second filter unit and the positive output end of the 3rd filter unit, to comprise controlled switch SW2 and resistance R10 controlled switch unit; Be arranged between the positive output end of second filter unit and the negative input end of the 3rd filter unit, to comprise controlled switch SW4 controlled switch unit; Be arranged between the negative output terminal of second filter unit and the positive input terminal of the 3rd filter unit, to comprise controlled switch SW5 controlled switch unit; Be arranged between the positive output end of the 4th filter unit and the negative input end of the 5th filter unit, to comprise controlled switch SW11 controlled switch unit; Be arranged between the negative output terminal of the 4th filter unit and the positive input terminal of the 5th filter unit, to comprise controlled switch SW12 controlled switch unit; Be arranged between the positive output end of second filter unit and the negative input end of the 5th filter unit, to comprise controlled switch SW3 controlled switch unit; Be arranged between the negative output terminal of second filter unit and the positive input terminal of the 5th filter unit, to comprise controlled switch SW6 controlled switch unit; That be connected with the positive output end of the 5th filter unit and the controlled switch unit of the negative input end of controlled selection connection second filter unit or the negative input end of the 4th filter unit (i.e. corresponding controlled switch SW7 and SW8 comprised in Fig. 2); That be connected with the negative output terminal of the 5th filter unit and the controlled switch unit of the positive input terminal of controlled selection connection second filter unit or the positive input terminal of the 4th filter unit (i.e. corresponding controlled switch SW9 and SW10 comprised in Fig. 2).
The control signal received when described low pass filter is: instruction SW1, SW2, SW4, SW5, SW8, SW9, SW11, SW12 are closed, and meanwhile, instruction SW3, SW6, SW7, SW10 disconnect, then described low pass filter is five rank filters.The control signal received when described low pass filter is: instruction SW1, SW2, SW4, SW5, SW8, SW9, SW11, SW12 disconnect, and meanwhile, instruction SW3, SW6, SW7, SW10 are closed, then described low pass filter is three rank filters.
As shown in Figure 3, the utility model provides a kind of configurable multiple band pass filter.Described multiple band pass filter 2 comprises: be connected with the differential input signal on I road, as above arbitrary described low pass filter 1, be connected with the differential input signal on Q road, as upper arbitrary as described in low pass filter 1 ', and be connected to controlled switching circuit unit (the corresponding controlled switch SW1 of the negative input end of low pass filter 1 on described I road and the positive output end of the low pass filter 1 ' on Q road
iand RC1
i), be connected to controlled switching circuit unit (the corresponding controlled switch SW2 of the negative output terminal of the positive input terminal of the low pass filter 1 on described I road and the low pass filter 1 ' on Q road
iand RC2
i), be connected to controlled switching circuit unit (the corresponding controlled switch SW3 of the positive output end of the positive input terminal of the low pass filter 1 ' on described Q road and the low pass filter 1 on I road
iand RC3
i), be connected to controlled switching circuit unit (the corresponding controlled switch SW4 of the negative output terminal of the negative input end of the low pass filter 1 ' on described Q road and the low pass filter 1 on I road
iand RC4
i).Wherein, resistance RC1
i, RC2
i, RC3
i, and RC4
ifor frequency translation resistance.
When the received controlled switch unit being connected to the positive output end of the negative input end of the low pass filter 1 on described I road and the low pass filter 1 ' on Q road is (as controlled switch SW1
i) and be connected to the positive input terminal of low pass filter 1 on described I road and the negative output terminal of the low pass filter 1 ' on Q road controlled switch unit (as controlled switch SW2
i) control signal of conducting, and the controlled switch unit being connected to the positive input terminal of low pass filter 1 ' on described Q road and the positive output end of the low pass filter 1 on I road is (as controlled switch SW3
i) and be connected to the negative input end of low pass filter 1 ' on described Q road and the negative output terminal of the low pass filter 1 on I road the controlled switch unit of controlled switching circuit unit (as controlled switch SW4
i) control signal of conducting, then the frequency translation resistance between every grade of two low pass filters is had an effect, and obtains the multiple band pass filter inputting orthogonal differential signal.
When the received controlled switch unit being connected to the positive output end of the negative input end of the low pass filter 1 on described I road and the low pass filter 1 ' on Q road is (as controlled switch SW1
i) and be connected to the positive input terminal of low pass filter 1 on described I road and the negative output terminal of the low pass filter 1 ' on Q road controlled switch unit (as controlled switch SW2
i) control signal that disconnects, and the controlled switch unit being connected to the positive input terminal of low pass filter 1 ' on described Q road and the positive output end of the low pass filter 1 on I road is (as controlled switch SW3
i) and be connected to the negative input end of low pass filter 1 ' on described Q road and the negative output terminal of the low pass filter 1 on I road the controlled switch unit of controlled switching circuit unit (as controlled switch SW4
i) control signal that disconnects, then as real number low pass filter.
In sum, configurable low pass filter of the present utility model and the multiple band pass filter that is suitable for, by arranging controlled switch unit between each filter unit, so that also can filter order be changed according to the switching realizing low pass logical with multiple band that needs of transmitting chain and receiver, multistage configurable filters solutions can be realized with single circuit, save area and the power consumption of circuit, be conducive to the raising of chip integration and the reduction of cost.So the utility model effectively overcomes shortcoming of the prior art and tool high industrial utilization.
Above-described embodiment is illustrative principle of the present utility model and effect thereof only, but not for limiting the utility model.Any person skilled in the art scholar all without prejudice under spirit of the present utility model and category, can modify above-described embodiment or changes.Therefore, such as have in art and usually know that the knowledgeable modifies or changes not departing from all equivalences completed under the spirit and technological thought that the utility model discloses, must be contained by claim of the present utility model.
Claims (6)
1. a configurable low pass filter, is characterized in that, comprising:
Have multiple filter units of corresponding differential input end and output, each described filter unit carries out cascade according to the maximum order in the filter transfer function preset;
Second level filter unit input to afterbody filter unit output between, be symmetrical arranged multiple controlled switch unit of corresponding configurable exponent number; Described controlled switch unit based on received control signal to should give gating/disconnection.
2. configurable low pass filter according to claim 1, it is characterized in that, described filter unit comprises: differential operational amplifier, be serially connected in the resistance of the positive and negative input of described operational amplifier respectively, be connected across the electric capacity between the positive input terminal of described operational amplifier and negative output terminal, be connected across the electric capacity between the negative input end of described operational amplifier and positive output end.
3. configurable low pass filter according to claim 1 and 2, is characterized in that, the structure of the adjacent two-stage of each described filter unit comprises: afterbody second order joint is the structure that leapfrogs, and second order joint at different levels is two binary filter structures before.
4. configurable low pass filter according to claim 2, is characterized in that, between the input that each described controlled switch unit is connected across multiple adjacent operational amplifier and output.
5. configurable low pass filter according to claim 1, is characterized in that, each described filter unit adopts Pyatyi cascade, corresponding:
From the input of described differential signal, be arranged on the resistance R5 between the negative input end of first filter unit and the negative output terminal of second filter unit;
Be arranged on the resistance R6 between the positive input terminal of first filter unit and the positive output end of second filter unit;
Be arranged between the negative input end of second filter unit and the negative output terminal of the 3rd filter unit, to comprise controlled switch SW1 and resistance R9 controlled switch unit;
Be arranged between the positive input terminal of second filter unit and the positive output end of the 3rd filter unit, to comprise controlled switch SW2 and resistance R10 controlled switch unit;
Be arranged between the positive output end of second filter unit and the negative input end of the 3rd filter unit, to comprise controlled switch SW4 controlled switch unit;
Be arranged between the negative output terminal of second filter unit and the positive input terminal of the 3rd filter unit, to comprise controlled switch SW5 controlled switch unit;
Be arranged between the positive output end of the 4th filter unit and the negative input end of the 5th filter unit, to comprise controlled switch SW11 controlled switch unit;
Be arranged between the negative output terminal of the 4th filter unit and the positive input terminal of the 5th filter unit, to comprise controlled switch SW12 controlled switch unit;
Be arranged between the positive output end of second filter unit and the negative input end of the 5th filter unit, to comprise controlled switch SW3 controlled switch unit;
Be arranged between the negative output terminal of second filter unit and the positive input terminal of the 5th filter unit, to comprise controlled switch SW6 controlled switch unit;
Be connected with the positive output end of the 5th filter unit and controlled selection is connected the controlled switch unit of the negative input end of second filter unit or the negative input end of the 4th filter unit;
Be connected with the negative output terminal of the 5th filter unit and controlled selection is connected the controlled switch unit of the positive input terminal of second filter unit or the positive input terminal of the 4th filter unit.
6. a configurable multiple band pass filter, is characterized in that, comprising:
Be connected with the differential input signal on I road, as the low pass filter as described in arbitrary in claim 1-5;
That be connected with the differential input signal on Q road, identical with I road low pass filter;
And be connected to the positive input terminal of low pass filter amplifier on described I road and the negative output terminal of the low pass filter on Q road, be connected to the positive output end of the negative input end of the low pass filter amplifier on described I road and the low pass filter on Q road, be connected to the positive output end of the positive input terminal of the low pass filter on described Q road and the low pass filter on I road, be connected to each controlled switching circuit unit of the frequency translation resistance of having connected of the negative output terminal of the negative input end of the low pass filter on described Q road and the low pass filter on I road.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520512006.7U CN204707103U (en) | 2015-07-15 | 2015-07-15 | Configurable low pass filter and the multiple band pass filter that is suitable for |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520512006.7U CN204707103U (en) | 2015-07-15 | 2015-07-15 | Configurable low pass filter and the multiple band pass filter that is suitable for |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204707103U true CN204707103U (en) | 2015-10-14 |
Family
ID=54286695
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520512006.7U Active CN204707103U (en) | 2015-07-15 | 2015-07-15 | Configurable low pass filter and the multiple band pass filter that is suitable for |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204707103U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105933014A (en) * | 2016-06-23 | 2016-09-07 | 珠海市魅族科技有限公司 | Signal transmitting system and method for terminal device and the terminal device |
| CN106505968A (en) * | 2016-11-02 | 2017-03-15 | 珠海市杰理科技股份有限公司 | Reconfigurable filter and complex filter |
| CN109714022A (en) * | 2018-12-13 | 2019-05-03 | 航天恒星科技有限公司 | A kind of filter that multidimensional is restructural |
| CN114553168A (en) * | 2020-11-27 | 2022-05-27 | 络达科技股份有限公司 | Filter circuit |
-
2015
- 2015-07-15 CN CN201520512006.7U patent/CN204707103U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105933014A (en) * | 2016-06-23 | 2016-09-07 | 珠海市魅族科技有限公司 | Signal transmitting system and method for terminal device and the terminal device |
| CN106505968A (en) * | 2016-11-02 | 2017-03-15 | 珠海市杰理科技股份有限公司 | Reconfigurable filter and complex filter |
| CN109714022A (en) * | 2018-12-13 | 2019-05-03 | 航天恒星科技有限公司 | A kind of filter that multidimensional is restructural |
| CN114553168A (en) * | 2020-11-27 | 2022-05-27 | 络达科技股份有限公司 | Filter circuit |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN204707103U (en) | Configurable low pass filter and the multiple band pass filter that is suitable for | |
| CN104704704A (en) | Charging circuit and terminal | |
| CN204650513U (en) | Distributed structure/architecture equipment and serial port circuit thereof | |
| CN103326693B (en) | Reconfigurable Gm_C filter circuit | |
| GB1585097A (en) | Active filter | |
| CN103227620A (en) | Reconfigurable Gm_C filter circuit | |
| CN103116567A (en) | Multi-serial-port selection circuit | |
| CN206241453U (en) | A kind of CUT remote control current interface circuit | |
| CN205430041U (en) | Panel computer power input circuit | |
| CN101814928A (en) | Receiving device and method | |
| CN205105240U (en) | Communication circuit | |
| CN204304610U (en) | A kind of power distribution network intelligent acquisition control device | |
| CN206977585U (en) | Intelligent acquisition system and management system | |
| CN203120015U (en) | Video signal amplification circuit | |
| CN203300775U (en) | Weak coupling cavity filter | |
| CN105006622A (en) | Microwave power divider | |
| CN204463409U (en) | A kind of wireless communication module | |
| CN103868543A (en) | Data acquisition card and data acquisition measuring device | |
| CN206135878U (en) | Compact switch matrix circuit | |
| CN214953763U (en) | Voltage sampling circuit for series battery pack based on discrete device | |
| CN203455657U (en) | Input expansion module | |
| CN203691426U (en) | Short wave and ultra-short wave radio intercommunication controller | |
| CN207910763U (en) | The power source connection circuit and mobile terminal of high-isolation | |
| CN203104438U (en) | Electric power carrier wave transmitting and receiving electric circuit | |
| CN203949323U (en) | A kind of air conditioner monitor |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20200331 Address after: 215634 north side of Chengang road and west side of Ganghua Road, Jiangsu environmental protection new material industrial park, Zhangjiagang City, Suzhou City, Jiangsu Province Patentee after: ZHANGJIAGANG KANGDE XIN OPTRONICS MATERIAL Co.,Ltd. Address before: 201203, room 5, building 690, No. 202 blue wave road, Zhangjiang hi tech park, Shanghai, Pudong New Area Patentee before: WZ TECHNOLOGY Inc. |