CN102098018A - Tunable bandpass filter system - Google Patents
Tunable bandpass filter system Download PDFInfo
- Publication number
- CN102098018A CN102098018A CN2011100567475A CN201110056747A CN102098018A CN 102098018 A CN102098018 A CN 102098018A CN 2011100567475 A CN2011100567475 A CN 2011100567475A CN 201110056747 A CN201110056747 A CN 201110056747A CN 102098018 A CN102098018 A CN 102098018A
- Authority
- CN
- China
- Prior art keywords
- signal
- frequency
- signals
- band
- bandwidth
- 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.)
- Pending
Links
Images
Abstract
The invention provides a tunable bandpass filter system, wherein the center frequency range of frequency signals output by the system is 470-862MHz; the system comprises a microprocessor unit, a digital tunable potentiometer and an analog circuit system, wherein the microprocessor unit is used for calculating data signals of frequency points, bandwidth, out-of-band signal rejection and signal gain requirements corresponding to system output requirements according to the received user instruction, and outputting more than one path of instruction signals to the corresponding digital tunable potentiometer unit; the digital tunable potentiometer is used for performing digital to analog conversion according to data bits in the instruction signals, and parallelly outputting four groups of analog voltage signals to the corresponding analog circuit system with the functions of the bandpass filter by taking clock signals as a working period; the analog circuit system with the functions of the bandpass filter is used for exactly intercepting the central frequency points of the input broadband frequency signals under the control of the digital tunable potentiometer according to the received analog voltage signals and then performing bandpass filtering; and a power amplifying part amplifies the signals so as to improve the signal gains to the required level.
Description
Technical field
The invention belongs to the radiofrequency signal processing technology field, be specifically related to a kind of accurate centre frequency, bandwidth control, out of band signal inhibition and adjustable filter system of signal gain in the 470-862MHz frequency range, exported.
Background technology
Global at present rf digital signal at 470 ~ 862MHz scope, traditional definition frequency range such as following table:
| BI-FM： | 47-108MHz |
| BIII： | 174-240MHz |
| VHF： | 240-470MHz |
| UHF： | 470-862MHz; |
And at actual uhf band, specifically defined 49 frequencies (No. 21 ~ No. 69 channels), each channel have corresponding centre frequency (such as, channel 21 is corresponding to frequency 471.25MHz, channel 37 is corresponding to 559.25MHz, and channel 69 is corresponding to frequency 855.25).
At the radiofrequency signal of transmitting in spatial transmission or the coaxial cable, must use qualified band pass filter to realize the selection and the reprocessing of concrete channel signals.And on same equipment, realize the alternative of whole channels, just must use the adjustable band pass filter of lower side frequency.Such as: a patent of invention of the Chinese Academy of Sciences Microelectronics Institute (patent No.: 200810104759.9): " a kind of variable band-pass filter ".This invention is exactly a kind of adjustable band pass filter, the method that adopts left hand and right-handed nonlinear transmission line to engage, and wherein left-hand nonlinear transmission line has series connection varactor and shunt inductance to constitute, and has high pass characteristic; And right-handed nonlinear transmission line is made of series inductance and varactor in parallel, has low-pass characteristic.Varactor bias voltage by control right-hand man nonlinear transmission line changes varactor electric capacity, thus the last lower side frequency of regulating this band pass filter respectively.
This band pass filter can be realized the selection of output frequency characteristic and bandwidth preferably effectively, but shortcoming is more:
(1) signal is actual has passed through high pass, the filtering of low pass two-stage, because actual transmissions is radiofrequency signal, the signal profit and loss of its transmission is bigger.Simultaneously, the noise of introducing signal is more in the transmission course;
(2) the accurate output of varactor bias voltage be cannot say for sure to change varactor electric capacity by bias voltage again by card, and the accuracy of lower side frequency is difficult to guarantee on the band pass filter after the adjusting;
(3) during actual the use, in the face of many frequency signal users can't understand the bias voltage that also do not need to understand the control varactor to what, last lower side frequency that can the accommodation zone bandpass filter reaches selects to export accurate frequency, bandwidth requirement;
(4) when the frequency that requires to export very for a long time, the bias voltage that can't control varactor in real time reaches the output demand;
(5) for than weak signal, there is not to select to provide in real time the function of signal gain.
Summary of the invention
This goal of the invention provides a kind of to extremely a plurality of accurate center frequency point of input radio frequency digital signal output, bandwidth control, the variable band-pass filter system of out of band signal inhibition and signal gain function.
The technical scheme that realizes the object of the invention is: a kind of variable band-pass filter system, and the radiofrequency signal centre frequency scope of this system's output is 470-862MHz, this system comprises:
Microprocessor unit (MCU), according to the user instruction that receives, calculate the data-signal that frequency, bandwidth, band suppress and signal gain requires that the output of corresponding system requires outward, the command signal of exporting more than one tunnel arrives corresponding digital adjustable potentiometer, and command signal comprises data-signal and clock signal;
The numeral adjustable potentiometer, each digital adjustable potentiometer is according to the data bit in the command signal, carry out digital-to-analogue conversion, with the clock signal is the work period, and the extremely corresponding analogue system that possesses bandpass filter function of four groups of analog voltage signals of line output, corresponding center frequency point, bandwidth, out of band signals suppress to require and the signal gain requirements four groups of analog voltage signals respectively;
The analogue system that possesses bandpass filter function, under digital adjustable potentiometer control, according to the analog voltage signal of receiving, obtain signal center's frequency, signal bandwidth and the signal gain demand of customer requirements, wide frequency RF signal to input carries out bandpass filtering after accurately intercepting center frequency point, power amplifying part in the analogue system is implemented to amplify to signal simultaneously, improves it and gains to the signal gain demand, exports satisfactory radiofrequency signal and uses for the user.
As a further improvement on the present invention, be provided with the parameter correspondence table in described microprocessor unit (MCU) flash memory, frequency, bandwidth, the out of band signal of listing system output in the parameter correspondence table suppress and the four groups of parameters that gain in each parameter value and with each parameter value data-signal one to one.
As a further improvement on the present invention, described microprocessor unit (MCU) is carried out the following step:
(1) accepts frequency, the bandwidth and the three groups of parameter values that gain that need system's output that the user imports;
(2) the parameter correspondence table of reading pre-stored in flash memory, each parameter value of importing according to step (1) carries out table lookup operation, obtains the data-signal of frequency, bandwidth, out of band signal inhibition and the signal gain requirement of the output requirement of corresponding system.
As a further improvement on the present invention, the table lookup operation in the described step (2) adopts the algorithm of base value+side-play amount, and this algorithm is zoom table soon, has saved the memory space of overall data simultaneously.This algorithm has made full use of neutral element in whole voltage signal parameters (repeat element just) characteristics on the high side, and actual temporary memory space 12 Kbytes have saved the memory space that surpasses half.
Utilization of the present invention is preset in the algorithm in microprocessor unit (MCU) chip, the current client of real-time analysis is to the demand of output signal, by the automatic output instruction signal of MCU (comprising data-signal, clock signal), digital-to-analogue conversion by digital adjustable potentiometer, export the analog circuitry system that four groups of analog voltage signals enter the one or more integrated electronic band-pass filter functions of four inputs, realize extremely a plurality of accurate center frequency point of input radio frequency digital signal output, bandwidth control, out of band signal are suppressed and the signal gain function.
Beneficial effect of the present invention is:
(1) this method has realized the automation of radiofrequency signal, the filtering enlarging function of deciding frequency, deciding bandwidth, gain calmly of precision effectively;
(2) function hommization: the user need not to understand product internal work principle, only needs to select the channel signals output of needs to get final product according to prompting on man-machine interface; MCU promptly can be according to input work automatically;
(3) system that possesses bandpass filter function only implements bandpass filtering, amplification.The loss of radiofrequency signal is less, the introducing signal noise is also less;
(4) total system possesses good replicability and autgmentability.Parallel subsystems is separate, realizes parallel noiseless work.
Description of drawings
Fig. 1 is the embodiment of the invention 1 a variable band-pass filter system configuration schematic diagram;
Fig. 2 is the analogue system schematic diagram that the embodiment of the invention 1 possesses bandpass filter function.
Embodiment
Be described further below in conjunction with drawings and Examples.
As shown in Figure 1, a kind of variable band-pass filter system, the centre frequency scope of this system's output is 470-862MHz, this system comprises:
Microprocessor unit (MCU), according to the user instruction that receives, calculate the data-signal of frequency, bandwidth, out of band signal inhibition and the signal gain requirement of the output requirement of corresponding system, the command signal of exporting more than one tunnel arrives corresponding digital adjustable potentiometer, and command signal comprises data-signal and clock signal.Be provided with the parameter correspondence table in microprocessor unit (MCU) flash memory, list in the parameter correspondence table frequency, the bandwidth of system output and each parameter value in the three groups of parameters that gain and with each parameter value data-signal one to one.
Microprocessor unit (MCU) is carried out the following step:
(1) accepts frequency, the bandwidth and the three groups of parameter values that gain that need system's output that the user imports;
(2) the parameter correspondence table of reading pre-stored in flash memory, each parameter value of importing according to step (1) carries out table lookup operation, obtains the data-signal of frequency, bandwidth, out of band signal inhibition and the signal gain requirement of the output requirement of corresponding system.Table lookup operation adopts the algorithm of base value+side-play amount.
The numeral adjustable potentiometer, each digital adjustable potentiometer is according to the data bit in the command signal, carry out digital-to-analogue conversion, with the clock signal is the work period, and the extremely corresponding analogue system that possesses bandpass filter function of four groups of analog voltage signals of line output, corresponding center frequency point, bandwidth, out of band signals suppress to require and the signal gain requirements four groups of analog voltage signals respectively;
The analogue system (as shown in Figure 2) that possesses bandpass filter function, under digital adjustable potentiometer control, according to the analog voltage signal of receiving, obtain signal center's frequency, signal bandwidth and the signal gain demand of customer requirements, wide frequency RF signal to input carries out bandpass filtering after accurately intercepting center frequency point, power amplifying part in the analogue system is implemented to amplify to signal simultaneously, improves it and gains to the signal gain demand, exports satisfactory radiofrequency signal and uses for the user.
Concrete implementation step is as follows:
(1) selects suitable microprocessor unit MCU, this embodiment has selected Microchip 18F4520 chip, to MCU programming, make MCU according to input digit logic level (being user's pre-seting) outputting data signals that circulates successively of its pin, clock signal to product real time signal processing requirement parameter to digital adjustable potentiometer;
(2) the digital adjustable potentiometer ISL90727 of selection Intersil company inserts its 4# port (SDA) and 3# port (SCL) respectively with digital signal and clock signal.5#, 6# port are exported as analog control signal, and other ports are set to default; Two groups of ISL90727 are a control unit CU, add up to 4 groups of analog signals of output;
(3) 4 groups of analog signals are inserted input control end Ctrl1, Ctrl2, Ctrl3, the Ctrl4 of the analogue system that possesses bandpass filter function, the numeral adjustable potentiometer is controlled the analogue system that possesses bandpass filter function, realizes radiofrequency signal is required according to preset value the function of the accurate centre frequency in location, bandwidth control, out of band signal inhibition and gain-adjusted.
Claims (5)
1. variable band-pass filter system, the radiofrequency signal centre frequency scope of this system's output is 470-862MHz, it is characterized in that this system comprises:
Microprocessor unit (MCU), according to the user instruction that receives, calculate the data-signal of frequency, bandwidth, out of band signal inhibition and the signal gain requirement of the output requirement of corresponding system, the command signal of exporting more than one tunnel arrives corresponding digital adjustable potentiometer unit, and command signal comprises data-signal and clock signal;
The numeral adjustable potentiometer, each digital adjustable potentiometer is according to the data bit in the command signal, carry out digital-to-analogue conversion, with the clock signal is the work period, and the extremely corresponding analog circuitry system that possesses bandpass filter function of four groups of analog voltage signals of line output, corresponding center frequency point, bandwidth, out of band signals suppress to require and the signal gain requirements four groups of analog voltage signals respectively;
The analog circuitry system that possesses bandpass filter function, under digital adjustable potentiometer control, according to the analog voltage signal of receiving, the signal center's frequency, signal bandwidth, the band that obtain customer requirements suppress outward and the signal gain demand, wide frequency RF signal to input is done bandpass filtering after accurately intercepting center frequency point, power amplifying part in the analog circuitry system is implemented to amplify to signal simultaneously, improves its signal gain to requiring level, and output meets the radiofrequency signal of customer requirements for using.
2. a kind of variable band-pass filter according to claim 1 system, it is characterized in that, described this microprocessor unit (MCU) adopts Microchip 18F4520 chip, and described digital adjustable potentiometer adopts the digital adjustable potentiometer ISL90727 of Intersil company.
3. a kind of variable band-pass filter according to claim 1 and 2 system, it is characterized in that, be provided with the parameter correspondence table in described microprocessor unit (MCU) flash memory, frequency, bandwidth, the out of band signal of listing system output in the parameter correspondence table suppress and three groups of parameters of signal gain in each parameter value and with each parameter value data-signal one to one.
4. a kind of variable band-pass filter according to claim 1 and 2 system is characterized in that described microprocessor unit (MCU) is carried out the following step:
(1) accepts frequency, the bandwidth and the three groups of parameter values that gain that need system's output that the user imports;
(2) the parameter correspondence table of reading pre-stored in flash memory, each parameter value of importing according to step (1) carries out table lookup operation, obtains the data-signal of frequency, bandwidth, out of band signal inhibition and the signal gain requirement of the output requirement of corresponding system.
5. a kind of variable band-pass filter according to claim 1 and 2 system is characterized in that the table lookup operation in the described step (2) adopts the algorithm of base value+side-play amount.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100567475A CN102098018A (en) | 2011-03-10 | 2011-03-10 | Tunable bandpass filter system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100567475A CN102098018A (en) | 2011-03-10 | 2011-03-10 | Tunable bandpass filter system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102098018A true CN102098018A (en) | 2011-06-15 |
Family
ID=44130915
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011100567475A Pending CN102098018A (en) | 2011-03-10 | 2011-03-10 | Tunable bandpass filter system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102098018A (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107592092A (en) * | 2017-10-18 | 2018-01-16 | 广州友智电气技术有限公司 | Segmented belt bandpass filter in high-frequency signal collection |
| US10050604B2 (en) | 2015-11-23 | 2018-08-14 | Aniotek Limited | Variable filter |
| CN113794482A (en) * | 2021-07-29 | 2021-12-14 | 三维通信股份有限公司 | Electrically tunable bandpass filter, radio frequency receiving link and communication system |
| US11277110B2 (en) | 2019-09-03 | 2022-03-15 | Anlotek Limited | Fast frequency switching in a resonant high-Q analog filter |
| US11290084B2 (en) | 2017-05-24 | 2022-03-29 | Anlotek Limited | Apparatus and method for controlling a resonator |
| US11876499B2 (en) | 2020-06-15 | 2024-01-16 | Anlotek Limited | Tunable bandpass filter with high stability and orthogonal tuning |
| US11909400B2 (en) | 2019-12-05 | 2024-02-20 | Anlotek Limited | Use of stable tunable active feedback analog filters in frequency synthesis |
| US11955942B2 (en) | 2021-02-27 | 2024-04-09 | Anlotek Limited | Active multi-pole filter |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1747227A (en) * | 2005-08-26 | 2006-03-15 | 中国科学院上海微系统与信息技术研究所 | Little band open loop coupling band-pass filter that offset-type micro-strip resonantor and harmonic wave suppress |
| CN101034881A (en) * | 2006-03-08 | 2007-09-12 | 鸿富锦精密工业（深圳）有限公司 | Band-pass filter |
| CN101102116A (en) * | 2007-07-31 | 2008-01-09 | 京信通信系统（中国）有限公司 | Multi-carrier transmitter based on digital middle frequency technology and its carrier transmission method |
| CN101610076A (en) * | 2009-07-21 | 2009-12-23 | 中国电子科技集团公司第四十一研究所 | The tunable band-pass filtering device of intelligent-tracking |
-
2011
- 2011-03-10 CN CN2011100567475A patent/CN102098018A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1747227A (en) * | 2005-08-26 | 2006-03-15 | 中国科学院上海微系统与信息技术研究所 | Little band open loop coupling band-pass filter that offset-type micro-strip resonantor and harmonic wave suppress |
| CN101034881A (en) * | 2006-03-08 | 2007-09-12 | 鸿富锦精密工业（深圳）有限公司 | Band-pass filter |
| CN101102116A (en) * | 2007-07-31 | 2008-01-09 | 京信通信系统（中国）有限公司 | Multi-carrier transmitter based on digital middle frequency technology and its carrier transmission method |
| CN101610076A (en) * | 2009-07-21 | 2009-12-23 | 中国电子科技集团公司第四十一研究所 | The tunable band-pass filtering device of intelligent-tracking |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10050604B2 (en) | 2015-11-23 | 2018-08-14 | Aniotek Limited | Variable filter |
| US10879875B2 (en) | 2015-11-23 | 2020-12-29 | Anlotek Limited | Variable filter |
| US11290084B2 (en) | 2017-05-24 | 2022-03-29 | Anlotek Limited | Apparatus and method for controlling a resonator |
| CN107592092A (en) * | 2017-10-18 | 2018-01-16 | 广州友智电气技术有限公司 | Segmented belt bandpass filter in high-frequency signal collection |
| US11277110B2 (en) | 2019-09-03 | 2022-03-15 | Anlotek Limited | Fast frequency switching in a resonant high-Q analog filter |
| US11909400B2 (en) | 2019-12-05 | 2024-02-20 | Anlotek Limited | Use of stable tunable active feedback analog filters in frequency synthesis |
| US11876499B2 (en) | 2020-06-15 | 2024-01-16 | Anlotek Limited | Tunable bandpass filter with high stability and orthogonal tuning |
| US11955942B2 (en) | 2021-02-27 | 2024-04-09 | Anlotek Limited | Active multi-pole filter |
| CN113794482A (en) * | 2021-07-29 | 2021-12-14 | 三维通信股份有限公司 | Electrically tunable bandpass filter, radio frequency receiving link and communication system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102098018A (en) | Tunable bandpass filter system | |
| CN102324946B (en) | High/intermediate-frequency front-end circuit of digital short-wave receiver | |
| CN104714089A (en) | Spectrum analyzer with filter bank | |
| CN102299878A (en) | Method and device for realizing multi-band digital predistortion (DPD) | |
| CN108199737A (en) | A kind of Larger Dynamic millimeter wave frequency conversion component | |
| CN104467888A (en) | Multi-channel shortwave receiving device | |
| CN204304999U (en) | A kind of multichannel short-wave reception device | |
| CN104579196B (en) | A kind of radio frequency signal amplifiers | |
| CN201976277U (en) | Current sampling circuit of electromagnetic oven | |
| CN103887582B (en) | A kind of continuous adjustable superconducting System of PC control multi-operation mode | |
| CN104734643A (en) | Low-power-consumption module index distribution method for radio frequency receiver | |
| CN104270104A (en) | High-intermodulation power amplifier employing APD (Amplitude Probability Distribution) technology | |
| CN101902287A (en) | Calibration test system, device and method of receivers | |
| CN201898489U (en) | Numerical-control frequency hopping filter | |
| CN205139630U (en) | Broadband automatic control's letter is made an uproar rate of flow and is installed mutually | |
| CN102195612A (en) | Semiconductor integrated circuit including constant adjusting circuit | |
| CN206135852U (en) | Double mode tunable plural IF filter of low -power consumption | |
| CN102215192B (en) | Analog-digital mixed channel selection filter | |
| CN203522670U (en) | Short-wave tracking tuned filter circuit | |
| CN209659254U (en) | A kind of numerical control attenuation circuit | |
| CN106411287B (en) | A kind of tunable complex intermediate frequency filter of low-power consumption double mode | |
| CN103457621A (en) | Automatic capacitance adjusting circuit in resonance circuit of receiving antenna | |
| CN109120292B (en) | A kind of digital automatic gain control system and method | |
| CN207819862U (en) | A kind of broad band amplifier of the adjustable gain of single supply power supply | |
| CN102571276A (en) | Short-wave digital signal processing method and module based on space-time coding |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20110615 |
|
| WD01 | Invention patent application deemed withdrawn after publication |