CN201571030U - Intelligent tracking tunable band-pass filtering device - Google Patents
Intelligent tracking tunable band-pass filtering device Download PDFInfo
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- CN201571030U CN201571030U CN2009200477015U CN200920047701U CN201571030U CN 201571030 U CN201571030 U CN 201571030U CN 2009200477015 U CN2009200477015 U CN 2009200477015U CN 200920047701 U CN200920047701 U CN 200920047701U CN 201571030 U CN201571030 U CN 201571030U
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Abstract
The utility model belongs to the technical field of signal filtering and provides an intelligent tracking tunable band-pass filtering device. The filtering device consists of a central processor, first to fourth DA converters, an RAM, an external data interrupt and high-pass filter, a first variable band-reject resonance filter, a second variable band-reject resonance filter, a low-pass filter, a II type resistance-impedance matcher, a first signal chip integrated radio frequency amplifier and a second signal chip integrated radio frequency amplifier. The intelligent tracking tunable band-pass filtering device adopts the high-pass filter with invariant cut-off frequency to suppress static spurious signals (invariant frequency and power), and adopts two band-reject resonance filters with variable resonance frequency and one intelligent tracking low-pass filter to form an intelligent tracking filtering device with variable center frequency and relative bandwidth so as to suppress the dynamic spurious signals.
Description
Affiliated technical field
The utility model belongs to the signal filtering technical field.More particularly, be a kind ofly to be applied to signal in the radio-frequency signal generator and to carry out after the frequency conversion extraction to intermediate-freuqncy signal, the tunable band-pass filtering device of a kind of intelligent-tracking that scanning local oscillator leakage signals, image signal, radio-frequency leakage signal and other spurious signals are suppressed simultaneously.
Background technology
At present, existing filter such as switch filtering device, YTF is tunable, and ferrite band pass filter means design structure principle all is based on basic band pass filter principle design forms.Switch filtering device institute performance characteristic is that wave band is many, and the centre frequency of each filter is constant, and relative bandwidth is constant; The YTF performance characteristic is that centre frequency is variable, and absolute bandwidth is constant.But, in the frequency conversion system of specific, radio-frequency signal source because local oscillator leakage signals, image signal and other spurious signal frequencies that scanning local oscillation signal and fixed RF signal are produced when carrying out frequency conversion all are variable, and their difference on the frequency is very little, as more with the number of this filter that needs of switch filtering device, the method is inadvisable.As using the tunable ferrite band pass filter means of YTF, its working frequency range is constant substantially in microwave section and bandwidth, also is difficult to satisfy the needs of up-converter system intelligent-tracking filtering in the radio-frequency signal generator.
The utility model content
In order to overcome the deficiency of existing filter apparatus intelligent-tracking filtering technique, the utility model provides the tunable band-pass filtering device that is applied to the intelligent-tracking that a kind of centre frequency is variable, relative bandwidth is variable in the radio-frequency signal generator up-converter system.
The tunable band-pass filtering device of intelligent-tracking provided by the utility model is by central processing unit, first to fourth DA transducer, RAM, external data is interrupted and filter network is formed, described filter network is by high pass filter, first variable strip zone resistance resonance filter, second variable strip zone resistance resonance filter, low pass filter, ∏ type resistive impedance adaptation, first, the second monolithic integrated RF amplifier constitutes, central processing unit passes through first to fourth DA transducer high pass filter in filter network respectively, first variable strip zone resistance resonance filter, second variable strip zone resistance resonance filter, low pass filter is carried the control voltage signal, and input signal is successively through high pass filter, ∏ type resistive impedance adaptation, first variable strip zone resistance resonance filter, the first monolithic integrated RF amplifier, second variable strip zone resistance resonance filter, the second monolithic integrated RF amplifier, export filtering signal behind the low pass filter.
Described variable low-pass filter is the seven rank low pass filters of being made up of inductance L 1-L4 and variable capacitance C1-C3.
Described first, second variable strip zone resistance resonator filter structure is identical, is made up of three series capacitance C6, C7, C8 and two series resonant circuits that are made of inductance L 5, variable capacitance C4 and inductance L 6, variable capacitance C5 of being connected to respectively on the link node of the link node of capacitor C 6 and capacitor C 7 and capacitor C 7 and capacitor C 8.
The tunable band-pass filtering device operation principle of intelligent-tracking provided by the utility model is as follows: (frequency is constant at first to adopt the constant high pass filter of cut-off frequency to suppress static spurious signal, power is constant), adopt the band resistance resonance filter of two resonance frequency variables and intelligent-tracking filter that centre frequency is variable, relative bandwidth is variable of low pass filter composition of an intelligent-tracking to suppress dynamic spurious signal (changeable frequency).
According to the up-converter system principle, obtaining corresponding spurious signal has: scanning local oscillator leakage signals, image signal, radio-frequency leakage signal and other intermodulation spurious signals.The utility model according to the frequency of single spurious signal whether change, the relative frequency difference of frequency values size and single spurious signal and useful signal, employing single-stage filter network or resonant network correspondingly suppresses this single spurious signal.That is to say, in the radio-frequency signal source frequency conversion system, because local oscillation signal is (frequency is with certain frequency step increasing or decreasing) of scanning, so after the up-conversion local oscillator leakage signals, image signal all be scanning and all be lower than or be higher than useful signal, adopt the constant high pass filter of cut-off frequency to realize to the inhibition of radio frequency leakage signal and other the spurious signal lower than useful signal frequency.The inhibition of local oscillator leakage signals and image signal is adopted first, second variable strip zone resistance resonance filter of the resonance frequency variable of two intelligent-trackings realize; The high spurious signal of contrast useful signal frequency adopts low pass filter a kind of intelligent-tracking, cut-off frequency varying to realize; So in the whole radio-frequency signal source up-converter system, first, second variable strip zone resistance resonance filter is the band resistance resonance filter that resonance frequency can change, realize the inhibition of local oscillator leakage signals and image signal respectively by the mode of two-stage cascade, add ∏ type resistive impedance adaptation and monolithic integrated RF amplifier during the filter cascade, so that control the impedance matching and the gain balance of whole intelligent-tracking filter; Because central processing unit output digital signal is converted to the two ends that aanalogvoltage is added in corresponding variable capacitance in high pass filter, first variable strip zone resistance resonance filter, second variable strip zone resistance resonance filter, the low pass filter respectively by first to fourth DA transducer, therefore, the tunable band-pass filtering device of intelligent-tracking provided by the utility model can be according to radio-frequency signal source frequency conversion system output signal, and is intelligent, from the corresponding local oscillator leakage signal of motion tracking filtering, image signal and other spurious signals.
The beneficial effects of the utility model are: design principle is simple, structure is easy to expansion flexibly, reliability height, cost are low; Also help the simplification of radio-frequency signal generator design.
Description of drawings
Fig. 1 is the theory diagram of the tunable band-pass filtering device embodiment of intelligent-tracking that the utility model provides;
Fig. 2 is the calibration data block diagram of the tunable band-pass filtering device of intelligent-tracking;
Fig. 3 is the calibration software block diagram of the tunable band-pass filtering device of intelligent-tracking;
Fig. 4 is the electrical schematic diagram of variable low-pass filter in the tunable band-pass filtering device of intelligent-tracking;
Fig. 5 is the electrical schematic diagram of first, second variable strip zone resistance resonance filter in the tunable band-pass filtering device of intelligent-tracking.
Embodiment
Further specify operation principle, the characteristics of the tunable band-pass filtering device of enforcement of the present utility model and intelligent-tracking that the utility model provides below in conjunction with accompanying drawing.
After scanning local oscillation signal and fixed RF up-conversion, contain the leakage signal that scans local oscillator in the frequency conversion product, variable image signal, variable useful signal, the multiple harmonic of variable local oscillator leakage signals and variable multistage intermodulation product, to carry out Filtering Processing to above-mentioned product, whether the utility model changes according to the frequency of single spurious signal, the relative frequency difference of frequency values size and single spurious signal and useful signal, adopt corresponding single-stage filter network or resonant network to suppress corresponding spurious signal, in whole radio-frequency signal source up-converter system, become a centre frequency variable by the system-level joint group of a plurality of sub-networks, the intelligent-tracking tunable filtering device that relative bandwidth is variable.
Figure 1 shows that the tunable band-pass filtering device embodiment theory diagram of intelligent-tracking that the utility model provides.As shown in Figure 1: the tunable band pass filter means of intelligent-tracking provided by the utility model is by central processing unit, first to fourth DA transducer, RAM, external data is interrupted and filter network is formed (in the empty frame is filter network), described filter network is by high pass filter, first variable strip zone resistance resonance filter, second variable strip zone resistance resonance filter, low pass filter, ∏ type resistive impedance adaptation, first, the second monolithic integrated RF amplifier constitutes, central processing unit passes through first to fourth DA transducer high pass filter in filter network respectively, first variable strip zone resistance resonance filter, second variable strip zone resistance resonance filter, low pass filter is carried the control voltage signal, and input signal is successively through high pass filter, ∏ type resistive impedance adaptation, first variable strip zone resistance resonance filter, the first monolithic integrated RF amplifier, second variable strip zone resistance resonance filter, the second monolithic integrated RF amplifier, export filtering signal behind the low pass filter.Described central processing unit output digital signal is converted to the high pass filter of analog control voltage in filter network by a DA transducer and carries, and controls its cut-off frequency, power is constant.Described central processing unit output digital signal is converted to analog control voltage by second, third DA transducer, and the resistance of first variable strip zone in filter network resonance filter, second variable strip zone resistance resonance filter are carried respectively, the resonant frequency point intelligence resonance that makes described first variable strip zone resistance resonance filter is on the local oscillation signal frequency, and the resonant frequency point intelligence resonance of second variable strip zone resistance resonance filter is on the image signal frequency.Described central processing unit output digital signal is converted to the low pass filter of analog control voltage in filter network by the 4th DA transducer and carries the variation of control low pass filter cutoff frequency.Fig. 4 is the electrical schematic diagram of variable low-pass filter in the tunable band-pass filtering device of intelligent-tracking.Form seven rank low pass filters by inductance L 1-L4 and variable capacitance C1-C3, inductance L 1-L4 adopts micro-band technique to make high impedance line inductance, the scope of 3 variable capacitance C1-C3 be zero point several pico farads to several pico farads, the digital signal of central processing unit output is converted to analog control voltage by the 4th DA transducer and is added on the variable capacitance, the sign appearance value of variable capacitance changes along with the variation of analog control voltage, thereby can change the cut-off frequency of low pass filter.Fig. 5 is the electrical schematic diagram of first, second variable strip zone resistance resonance filter in the tunable band-pass filtering device of intelligent-tracking.As shown in Figure 5: first, second variable strip zone resistance resonance filter by three series capacitance C6, C7, C8 and on the link node of the link node of capacitor C 6 and capacitor C 7 and capacitor C 7 and capacitor C 8, be connected to respectively constitute two series resonant circuits by inductance L 5, variable capacitance C4 and inductance L 6, variable capacitance C5 and form.Form one three rank bandreject filtering prototype from whole filter structure, inductance L 5, L6 adopt micro-band technique to make high impedance line inductance, the scope of 2 variable capacitance C4, C5 be zero point several pico farads to several pico farads; First, second variable strip zone resistance resonator filter circuit structure is identical, central processing unit output digital signal is by second, the 3rd DA transducer is converted to the analog control voltage resistance of first variable strip zone in filter network resonance filter respectively, second variable strip zone resistance resonance filter is carried, analog control voltage is added on the variable capacitance, the sign appearance value of variable capacitance changes along with the variation of analog control voltage, thereby can change the resonance frequency of resonance filter, the resonant frequency point intelligence resonance that makes described first variable strip zone resistance resonance filter is on the local oscillation signal frequency, and the resonant frequency point intelligence resonance of second variable strip zone resistance resonance filter is on the image signal frequency.Realize respectively the inhibition of local oscillator leakage signals and image signal adding ∏ type resistive impedance adaptation and monolithic integrated RF amplifier during the filter cascade, by the mode of two-stage cascade so that control the impedance matching and the gain balance of whole intelligent-tracking filter.
Fig. 2 is the calibration data block diagram of the tunable band-pass filtering device of intelligent-tracking; After the tunable band-pass filtering device hardware system of intelligent-tracking is put up, also need the software calibration data.The utility model obtains this device software calibration data according to shown in Figure 2 by the external instrument network analyzer.Network analysis and central processing unit are to communicate by letter by gpib interface with transmitting desired data in the drawings, 4 DA deposit data that obtain in RAM; The system calibration software flow as shown in Figure 3,4 DA data of original frequency are sent in initialization behind the system boot earlier, read the inhibition parameter from lattice gauge again.As satisfy condition, frequency step adds up, and the frequency values that obtains adding up is delivered to the original frequency register, repeats aforesaid operations; As not satisfying condition, change 4 DA data till satisfying condition, carry out frequency again and add up, repeating aforesaid operations is the final frequency values of setting up to current frequency, promptly software calibration is finished.Device finally obtains the desired data of 4 DA transducers on each Frequency point.
Because the frequency of radio-frequency leakage signal and intermodulation signal is all less than useful signal, the utility model adopts the mode of the constant high pass of cut-off frequency mainly to suppress radio-frequency leakage signal and intermodulation signal;
Because the intermodulation signal of part all is higher than useful signal, the utility model adopts the low-pass filtering mode of cut-off frequency varying to suppress intermodulation signal and spurious signal; The changing voltage of 4 DA transducers must be added on the corresponding variable capacitance;
The mode that adopts first, second variable strip zone to hinder the resonance filter two-stage cascade realizes the inhibition of local oscillator leakage signals and image signal respectively;
Because there are certain differential loss in high pass, low pass filter and variable strip zone resistance resonance filter, the utility model adds ∏ type resistive impedance adaptation and monolithic integrated RF amplifier when the filter cascade, so that control the impedance matching and the gain balance of whole intelligent-tracking filter.
When regulating mutually, the low intelligent-tracking variable strip zone of cut-off frequency resistance resonance filter and the high intelligent-tracking variable low-pass filter of cut-off frequency just can form the intelligent-tracking filter that centre frequency is variable, relative bandwidth is variable.
Along with the rapid raising of the communication technology and the continuous improvement of performance, in radio-frequency signal generator, adopt the mode of up-conversion more and more universal.Present embodiment is in conjunction with up-conversion mode commonly used in the radio-frequency signal generator, to the extraction of the inhibition of the spuious product of frequency conversion and useful intermediate-freuqncy signal the time, it is a kind of intelligence, tunable, tracking band-pass filter device that this device is proved to be, and can come the centre frequency and the corresponding bandwidth of Intelligence Selection tunable bandpass filters according to the frequency of scanning local oscillator.When the central processing unit output digital signal of device is converted to aanalogvoltage and is added in the corresponding variable capacitance of each filter two ends by the DA transducer, the sign appearance value of variable capacitance changes along with the variation of aanalogvoltage, thereby changes the centre frequency and the respective bandwidth of tracking filter device.
The tunable band-pass filtering device of intelligent-tracking that the utility model provides is formed by a plurality of sub-filter network cascades, and structure is easy to expansion flexibly, mostly adopts microstrip line to realize that cost is lower, has certain practical value in printed board.
Claims (3)
1. the tunable band-pass filtering device of an intelligent-tracking, it is characterized in that by central processing unit, first to fourth DA transducer, RAM, external data is interrupted and filter network is formed, described filter network is by high pass filter, first variable strip zone resistance resonance filter, second variable strip zone resistance resonance filter, variable low-pass filter, ∏ type resistive impedance adaptation, first, the second monolithic integrated RF amplifier constitutes, central processing unit passes through first to fourth DA transducer high pass filter in filter network respectively, first variable strip zone resistance resonance filter, second variable strip zone resistance resonance filter, variable low-pass filter is carried the control voltage signal, and input signal is successively through high pass filter, ∏ type resistive impedance adaptation, first variable strip zone resistance resonance filter, the first monolithic integrated RF amplifier, second variable strip zone resistance resonance filter, the second monolithic integrated RF amplifier, export filtering signal behind the variable low-pass filter.
2. according to the tunable band-pass filtering device of right 1 described intelligent-tracking, it is characterized in that the seven rank low pass filters of described variable low-pass filter for forming by inductance (L1-L4) and variable capacitance (C1-C3).
3. according to the tunable band-pass filtering device of right 1 described intelligent-tracking, it is characterized in that described first, second variable strip zone resistance resonator filter structure is identical, form by three series capacitances (C6, C7, C8) and two series resonant circuits that constitute by inductance (L5), variable capacitance (C4) and inductance (L6), variable capacitance (C5) of on the link node of the link node of electric capacity (C6) and electric capacity (C7) and electric capacity (C7) and electric capacity (C8), being connected to respectively.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009200477015U CN201571030U (en) | 2009-07-21 | 2009-07-21 | Intelligent tracking tunable band-pass filtering device |
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| CN2009200477015U CN201571030U (en) | 2009-07-21 | 2009-07-21 | Intelligent tracking tunable band-pass filtering device |
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| CN201571030U true CN201571030U (en) | 2010-09-01 |
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| CN2009200477015U Expired - Fee Related CN201571030U (en) | 2009-07-21 | 2009-07-21 | Intelligent tracking tunable band-pass filtering device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107196621A (en) * | 2017-06-12 | 2017-09-22 | 广州慧智微电子有限公司 | A kind of filter circuit, radio-frequency power amplifier and communication terminal |
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2009
- 2009-07-21 CN CN2009200477015U patent/CN201571030U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107196621A (en) * | 2017-06-12 | 2017-09-22 | 广州慧智微电子有限公司 | A kind of filter circuit, radio-frequency power amplifier and communication terminal |
| CN107196621B (en) * | 2017-06-12 | 2024-06-07 | 广州慧智微电子股份有限公司 | Filter circuit, radio frequency power amplifier and communication terminal |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100901 Termination date: 20150721 |
|
| EXPY | Termination of patent right or utility model |