CN205232171U - Electronic tuning wave filter and terminal equipment - Google Patents
Electronic tuning wave filter and terminal equipment Download PDFInfo
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- CN205232171U CN205232171U CN201520983433.3U CN201520983433U CN205232171U CN 205232171 U CN205232171 U CN 205232171U CN 201520983433 U CN201520983433 U CN 201520983433U CN 205232171 U CN205232171 U CN 205232171U
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Abstract
The utility model belongs to the technical field of the telecommunications, a electronic tuning wave filter and terminal equipment is disclosed, include: the filter network module, wave band control module and offset voltage control module, the filter network module contains a plurality of sub - filtering units, the filter network module for receive radio frequency analog signal sends the sub - filtering unit for corresponding the frequency with radio frequency analog signal, every sub - filtering unit includes a plurality of inductance and a plurality of varactor at least, and every sub - filtering unit is used for carrying out filtering to received radio frequency analog signal, wave band control module for producing the control signal of each sub - filtering unit, and exporting the sub - filtering unit that corresponds with control signal, control signal is used for controlling that sub - filtering unit is started working or the stop work, offset voltage control module for control varactor's in each sub - filtering unit offset voltage, change varactor's capacitance value, thus the central frequency when adjusting each sub - filtering unit and carrying out filtering.
Description
Technical field
The utility model relates to electronic communication technology field, particularly relates to a kind of electronic tuning filter and terminal equipment.
Background technology
In recent years, along with the development of the communication technology, military radio communication is more and more higher to jamproof requirement, especially barrage jamming problem.Short-wave receiver all have employed the band-pass filter group of fixed-bandwidth to improve its antijamming capability at radio-frequency front-end, but, when receive frequency range is larger, the surge of filter quantity can be caused, all unfavorable factor is brought to the cost control of equipment and Miniaturization Design.
Utility model content
For the shortcoming of prior art, embodiment of the present utility model provides a kind of electronic tuning filter and terminal equipment.This electronic tuning filter is applicable to the filtering of terminal equipment receiver front end radiofrequency signal, is changed the capacitance of varactor by the bias voltage changing variable capacitance diode, thus the centre frequency of accommodation zone bandpass filter, realize electric tuning narrow-band filtering.
For achieving the above object, embodiment of the present utility model adopts following technical scheme to be achieved.
Technical scheme one:
A kind of electronic tuning filter, described electronic tuning filter comprises: filter network module, wave band control module and bias voltage control module, and wherein, described filter network module comprises multiple sub-filter unit;
Described filter network module, for received RF analog signal, sends to the sub-filter unit of corresponding frequency band by described radio frequency analog signal; Every sub-filter unit comprises at least one for regulating the variable capacitance diode of its centre frequency, and described every sub-filter unit is used for carrying out filtering to the radio frequency analog signal received;
Described wave band control module, for generation of the control signal of each sub-filter unit, and described control signal is outputted to corresponding sub-filter unit, described control signal is started working for controlling sub-filter unit or is quit work;
Described bias voltage control module, for controlling the bias voltage of variable capacitance diode in each sub-filter unit, changes the capacitance of variable capacitance diode, thus centre frequency when regulating each sub-filter unit to carry out filtering.
The feature of technical scheme one and being further improved to:
(1) described wave band control module comprises serial-parallel conversion circuit, and it converts serial data to parallel data; Described parallel data composition control signal, outputs to each sub-filter unit, controls each sub-filter unit and starts working or quit work.
(2) described bias voltage control module comprises memory, D/A converter and operational amplifier, described memory is for storing digital voltage, described D/A converter is used for described digital voltage to be converted to analog voltage, described operational amplifier is used for amplifying described analog voltage, and send to each sub-filter unit, control the bias voltage of variable capacitance diode in each sub-filter unit, wherein, described digital voltage be prestore carry out filtering with each sub-filter unit time voltage data value corresponding to centre frequency.
(3) described serial-parallel conversion circuit adopts MAX4896 chip to realize.
(4) described memory and D/A converter adopt AK9824 synthesis chip to realize.
Technical scheme two:
A kind of terminal equipment, described terminal equipment comprises as the electronic tuning filter as described in technical scheme one.
The utility model adopts electronic tuning filter, by appropriate design, the wave band of filter same frequency range is reduced, makes filtering bandwidth greatly narrow simultaneously.Barrage jamming problem be can effectively prevent, thus receiving sensitivity and the antijamming capability of system improved.
Accompanying drawing explanation
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art 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 these accompanying drawings.
The structural representation one of a kind of electronic tuning filter that Fig. 1 provides for the utility model embodiment;
The structural representation two of a kind of electronic tuning filter that Fig. 2 provides for the utility model embodiment;
The structural representation of the filter network module that Fig. 3 provides for the utility model embodiment;
Fig. 4 starts working and out-of-work principle schematic for wave band control module that the utility model embodiment provides controls sub-filter network;
The structural representation of the bias voltage control module that Fig. 5 provides for the utility model embodiment.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, be clearly and completely described the technical scheme in 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 of ordinary skill 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.
A kind of implementation of electronic tuning filter is the capacitance changing variable capacitance diode by changing variable capacitance diode DC offset voltage, thus changes the centre frequency of band pass filter, realizes voltage-controlled tracking filter function.
The utility model embodiment provides a kind of electronic tuning filter, as shown in Figure 1, described electronic tuning filter comprises: filter network module 1, wave band control module 2 and bias voltage control module 3, wherein, described filter network module comprises multiple sub-filter unit.
Described filter network module 1, for received RF analog signal, sends to the sub-filter unit of corresponding frequency band by described radio frequency analog signal; Every sub-filter unit at least comprises one for regulating the variable capacitance diode of its centre frequency, and described every sub-filter unit is used for carrying out filtering to the radio frequency analog signal received.
Described wave band control module 2, for generation of the control signal of each sub-filter unit, and described control signal is outputted to corresponding sub-filter unit, described control signal is started working for controlling sub-filter unit or is quit work.
Described bias voltage control module 3, for controlling the bias voltage of variable capacitance diode in each sub-filter unit, changes the capacitance of variable capacitance diode, thus centre frequency when regulating each sub-filter unit to carry out filtering.
Further, described wave band control module 2 comprises serial-parallel conversion circuit, and it converts serial data to parallel data; Described parallel data composition control signal, outputs to each sub-filter unit, controls each sub-filter unit and starts working or quit work.
Described serial-parallel conversion circuit adopts MAX4896 chip.
Further again, described bias voltage control module 3 comprises memory, D/A converter and operational amplifier, described memory is for storing digital voltage, described D/A converter is used for described digital voltage to be converted to analog voltage, described operational amplifier is used for amplifying described analog voltage, and send to each sub-filter unit, control the bias voltage of variable capacitance diode in each sub-filter unit, wherein, described digital voltage be prestore carry out filtering with each sub-filter unit time voltage data value corresponding to centre frequency.
Described memory and D/A converter adopt AK9824 synthesis chip.
The utility model embodiment also provides a kind of terminal equipment, and described terminal equipment comprises the electronic tuning filter as described in above-described embodiment.
Exemplary, the utility model embodiment is described the electronic tuning filtering in technical solutions of the utility model and short-wave radio set to be applicable to short frequency section 1.6MHz-30MHz.
This electronic tuning filtering is by the filter network module of 1.6MHz-30MHz, be divided into three sub-filter units, every sub-filter unit is made up of nine inductance coils, some variable capacitance diodes, by changing the bias voltage of variable capacitance diode, change the capacitance of varactor, thus the centre frequency of accommodation zone bandpass filter, realize electric tuning filtering.
Wave band control module is completed by serial-parallel conversion circuit MAX4896, and the microcomputer of short-wave radio set is sent to the 8 Bits Serial data transaction come and become 8 bit parallel data to export from eight parallel port by this circuit, and serial, parallel data are as low and high level.Three sub-filter units only need three output ports, and all the other five output ports are unsettled.Because three sub-filter units are connected in HW highway simultaneously, therefore, the output switching diode of every sub-filter unit is as the switch of sub-filter unit, and switching diode positive pole often connects high level, and negative pole connects parallel data mouth.When short-wave radio set requires that a certain sub-filter unit connects HW highway, the microcomputer control MAX4896 of short-wave radio set sends low level to this sub-filter unit, and all the other send high level.
When the switching diode conducting of a certain sub-filter unit, this sub-filter unit connects radio frequency input, and radio frequency analog signal carries out filtering, and filtered signal is outputted to HW highway, and the switching diode of its minor filter unit is disconnected.Only have a low level in the parallel data that microcomputer sends at every turn, all the other are high level.
Bias voltage control module is that the microcomputer of short-wave radio set is according to the memory in FREQUENCY CONTROL electronic tuning filter and D/A converter combiner circuit AK9824, hexadecimal data in memory corresponding address is converted to through D/A converter to give fortune operational amplifier after analog voltage and amplify, then produce bias voltage VT.
By changing the bias voltage of variable capacitance diode, changing the capacitance of varactor, thus regulating the centre frequency of band pass filter in sub-filter unit, realizing narrow-band filtering.
Concrete, as shown in Figure 2, be a kind of electrical block diagram being applicable to short frequency section electronic tuning filter that the utility model provides.
Electronic tuning filter is made up of three parts, i.e. filter network module, wave band control module, bias voltage control module.
This electronic tuning filter covering frequence scope, between 1.6MHz-30MHz, is divided into three wave bands:
First band: 1.60-3.9999MHz;
Second band: 4.00-9.9999MHz;
3rd wave band: 10.00-30.0000MHz.
Filter network module as shown in Figure 3: this filter network module adopts antiresonant circuit, it is adopt inductance to carry out the latticed form be coupled.Input, output are designed to inductance tap mode, to improve Q of resonance circuit value; Tuning varactor C1-C20 is connected in parallel, and C21-C40 is connected in parallel (the varactor capacitance that Capacitance parallel connection is equivalent to 20 these models is added).
The bias voltage of varactor is provided by VT, changes the capacitance of varactor by changing the bias voltage VT of variable capacitance diode, can the centre frequency of accommodation zone bandpass filter easily, thus realizes electric tuning filtering.
The frequency tuning range of sub-filter unit depends on the capacitance size of connecting in the effective capacitance no-load voltage ratio of varactor and circuit.Due to electric capacity string and principle is multiple Capacitance parallel connections, more and larger; Multiple capacitances in series, goes here and there less and less.So and variable capacitance diode series connection electric capacity C41, C42, C43, C44 should try one's best greatly, so that this electric capacity connect with varactor after overall effective capacitance capacitance variation when bias voltage VT changes little, the stepping when regulating continuously of the centre frequency of corresponding filter is little, and the frequency of covering is wide.
This filter network module adopts antiresonant circuit, and the electrically tunable filter of antiresonant circuit has the large advantage of input dynamic range compared to the electrically tunable filter of series resonant circuit.
Wave band control module is specifically completed by a serial-parallel conversion circuit.When a string eight-digit binary number code word sent here by the microcomputer of short-wave radio set, this circuit carrys out serial code word to be converted to parallel code word Data at rising edge clock temporarily and exports from 8 parallel ports, as shown in Figure 4, start working and out-of-work principle schematic for wave band control module controls sub-filter network, V1, V2 as band switch, when Data1 is low level, diode current flow, radiofrequency signal adjusts network by n band electricity; When Data1 is high level, diode ends, and n band is obstructed.
As shown in Figure 5, that bias voltage control module adopts is the integrated circuit AK9824 of a flash memory and D/A converter, and this circuit volume is little, and integrated level is high.This circuit memory address is divided into Liang Ge district A0, A1.Each district is 256 addresses.
First according to flash memory operation principle, computing formula is inferred
(Vcc/256)*X＝Vt/4，X＝256Vt/4Vcc
Vcc/256 represents minimum step voltage, and Vcc is the operating voltage of this circuit, and be also the benchmark that flash memory data stores, X represents the 16 system code words stored in flash memory, and Vt represents the voltage that a certain frequency is corresponding.
The maximum tuning voltage VT that this electronic tuning filter needs is 13V, and short-wave radio set requires that complete machine can work, so connecting a multiplication factor in D/A converter rear end is the operational amplifier of 4 when Power supply is not less than 9.5V.
Voltage transitions corresponding for frequency becomes 16 system code word X to be stored in the address of flash memory by short-wave radio set microcomputer.When microcomputer provides corresponding frequencies instruction, data X in flash memory calls appropriate address converts analog voltage to through D/A converter and gives operational amplifier and amplify, voltage VT (0.7V-13V) after amplification controls the variable capacitance diode of each sub-filter network, to reach the centre frequency of accommodation zone bandpass filter.
The band of this electronic tuning filter leads to that selectivity is good, and antijamming capability is strong, the advantage such as have high-performance and volume is little, thus can improve receiving sensitivity and the antijamming capability of system.
The above; be only embodiment of the present utility model; but protection range of the present utility model is not limited thereto; anyly be familiar with those skilled in the art in the technical scope that the utility model discloses; change can be expected easily or replace, all should be encompassed within protection range of the present utility model.Therefore, protection range of the present utility model should be as the criterion with the protection range of described claim.
Claims (6)
1. an electronic tuning filter, is characterized in that, described electronic tuning filter comprises: filter network module, wave band control module and bias voltage control module, and wherein, described filter network module comprises multiple sub-filter unit;
Described filter network module, for received RF analog signal, sends to the sub-filter unit of corresponding frequency band by described radio frequency analog signal; Every sub-filter unit comprises at least one for regulating the variable capacitance diode of its centre frequency, and described every sub-filter unit is used for carrying out filtering to the radio frequency analog signal received;
Described wave band control module, for generation of the control signal of each sub-filter unit, and described control signal is outputted to corresponding sub-filter unit, described control signal is started working for controlling sub-filter unit or is quit work;
Described bias voltage control module, for controlling the bias voltage of variable capacitance diode in each sub-filter unit, changes the capacitance of variable capacitance diode, thus centre frequency when regulating each sub-filter unit to carry out filtering.
2. a kind of electronic tuning filter according to claim 1, is characterized in that,
Described wave band control module comprises serial-parallel conversion circuit, and it converts serial data to parallel data; Described parallel data composition control signal, outputs to each sub-filter unit, controls each sub-filter unit and starts working or quit work.
3. a kind of electronic tuning filter according to claim 1, is characterized in that,
Described bias voltage control module comprises memory, D/A converter and operational amplifier, described memory is for storing digital voltage, described D/A converter is used for described digital voltage to be converted to analog voltage, described operational amplifier is used for amplifying described analog voltage, and send to each sub-filter unit, control the bias voltage of variable capacitance diode in each sub-filter unit, wherein, described digital voltage be prestore carry out filtering with each sub-filter unit time voltage data value corresponding to centre frequency.
4. a kind of electronic tuning filter according to claim 2, is characterized in that,
Described serial-parallel conversion circuit adopts MAX4896 chip to realize.
5. a kind of electronic tuning filter according to claim 3, is characterized in that,
Described memory and D/A converter adopt AK9824 synthesis chip to realize.
6. a terminal equipment, is characterized in that, described terminal equipment comprises the electronic tuning filter as described in any one of claim 1-5.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520983433.3U CN205232171U (en) | 2015-12-01 | 2015-12-01 | Electronic tuning wave filter and terminal equipment |
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| CN201520983433.3U CN205232171U (en) | 2015-12-01 | 2015-12-01 | Electronic tuning wave filter and terminal equipment |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107257248A (en) * | 2017-07-19 | 2017-10-17 | 泉州泽仕通科技有限公司 | Broadband short range digital radio station and its operation method |
| CN108923767A (en) * | 2018-06-06 | 2018-11-30 | 武汉博畅通信设备有限责任公司 | The electrically tunable filter of 25 ~ 2500MHZ based on single-chip microcontroller F330 |
| CN111213063A (en) * | 2017-10-16 | 2020-05-29 | 尼亚布科知识产权控股有限责任公司 | Battery monomer monitoring system |
-
2015
- 2015-12-01 CN CN201520983433.3U patent/CN205232171U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107257248A (en) * | 2017-07-19 | 2017-10-17 | 泉州泽仕通科技有限公司 | Broadband short range digital radio station and its operation method |
| CN107257248B (en) * | 2017-07-19 | 2019-10-29 | 泉州泽仕通科技有限公司 | Broadband short range digital radio station and its operation method |
| CN111213063A (en) * | 2017-10-16 | 2020-05-29 | 尼亚布科知识产权控股有限责任公司 | Battery monomer monitoring system |
| CN108923767A (en) * | 2018-06-06 | 2018-11-30 | 武汉博畅通信设备有限责任公司 | The electrically tunable filter of 25 ~ 2500MHZ based on single-chip microcontroller F330 |
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