CN105991105B - A kind of LC electrically adjusted band-pass filters and LC electricity tune bandstop filters - Google Patents
A kind of LC electrically adjusted band-pass filters and LC electricity tune bandstop filters Download PDFInfo
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Abstract
The invention discloses a kind of LC electrically adjusted band-pass filters and LC electricity tune bandstop filters, including sequentially connected band logical (or with resistance) tuning frequency selection circuit, biasing circuit, voltage control circuit and frequency coding memory, the BST ceramics compression capacitors as tuned cell are provided on band logical (or with resistance) the tuning frequency selection circuit, D/A converters are provided on voltage control circuit, the control code that control system is sent out is transferred to the D/A converters of voltage control circuit by frequency coding memory, voltage control circuit the output phase should control voltage, and control voltage is transferred to the BST ceramics compression capacitors of band logical (or with resistance) tuning frequency selection circuit by biasing circuit, control BST ceramics compression capacitors be tuned to corresponding frequencies.The present invention is more low in energy consumption than switched capacitor array bounce frequency filter, small, at low cost, than varactor electrically tunable filter dynamic (usual ＜ 10dBm) greatly, up to 33 34dBm, especially suitable for hand-held or backpack communication station.
Description
Technical field
The present invention relates to a kind of wave filter, more particularly to a kind of LC electrically adjusted band-pass filters (BPF) and the resistance filter of LC electricity tune band
Wave device (BRF).
Background technology
In a watt grade power (input dynamic P-1>=30dBm) hand-held or backpack forces station in, internationally famous manufacturer
The tunable band-pass or tunable band-stop filter of Polezero companies production are using PIN switches-capacitor array technical solution, institute
Need power consumption as follows：
Domestic 1W grades of variable band-pass filter also uses PIN switched capacitor array technical solutions, and power supply power consumption is as follows：
Though domestic 1W grades of variable band-pass filter power consumption is relatively low, same band, Insertion Loss is larger.The country has no tunable band-stop
Wave filter produces.
Although Paratek Microwave companies of the U.S. and Agile RF companies production BST (barium strontium titanate) tunable band-pass
Wave filter, but its circuit design method does not give disclosure.
There are following defects for above-mentioned PIN switched capacitor arrays formula variable band-pass filter：Power supply power consumption is big, in hand-held set army
It is of non-ideal use with radio station.
The co-located wave filter patent descriptions of CN203522719U in the double radio station work of 108-400MHz ultrashort waves, exist big
The big interference signal such as fm broadcast signal and television broadcasting signal is measured, these enter receiving front-end module unattenuatedly, to radio station
Sensitivity and cross modulation effects it is very big, increase notch filter (i.e. bandstop filter), can effectively inhibit clutter interference, mutually
Cadre enrolled among workers disturbs and blocks interference, is obviously improved communication sensitivity and communication distance, and has big signal interference ability outside anti-frequency band
It improves.In electronic countermeasure broadband receiving system, it is desirable to using tunable band-stop filter, effectively inhibit fm broadcast signal and electricity
Depending on the big interference signal such as broadcast singal.Ultra wide band (UWB) technology requirement shown up prominently uses very wide radio-frequency spectrum, this meaning
Taste undesirable narrow band radio signals it is possible that meeting interference uwb system, solution is that one is introduced on UWB passbands
Cutting can be carried out to change or the narrow-band band-elimination of electric tuning (trap) wave filter.This electronics reconfigurable filter be also wideband radar or
Electronics military systems are thirsted for.
Invention content
The purpose of the present invention, which is that, provides a kind of Larger Dynamic, low-power consumption LC electrically adjusted band-pass filters and the resistance filter of LC electricity tune band
Wave device.
To achieve these goals, the technical solution adopted by the present invention is such：The LC electricity tune bandpass filterings of the present invention
Device, it is described including sequentially connected band-pass tuning frequency selection circuit, biasing circuit, voltage control circuit and frequency coding memory
The BST ceramics compression capacitors as tuned cell are provided on band-pass tuning frequency selection circuit, are provided on voltage control circuit
The control code that control system is sent out is transferred to the D/A converters of voltage control circuit by D/A converters, frequency coding memory,
Voltage control circuit the output phase should control voltage, and control voltage is transferred to band-pass tuning frequency selection circuit by biasing circuit
BST ceramics compression capacitors, control BST ceramics compression capacitor be tuned to corresponding frequencies.
Preferably, the band-pass tuning frequency selection circuit is pressure-sensitive including seven high Q fixed inductances, two adjustable BST ceramics
The double-tuned circuit that capacitor group is formed, first, second and third inductance are sequentially connected in series from input terminal to output terminal, the 4th inductance one end
Input terminal, other end ground connection are connected to, the 5th inductance one end is connected between the first inductance and the second inductance, other end ground connection,
6th inductance one end is connected between the second inductance and third inductance, and other end ground connection, the 7th inductance one end is connected to output terminal,
The other end is grounded, and first group of BST ceramics compression capacitors one end is connected between the first inductance and the 5th inductance, another termination
Ground, second group of BST ceramics compression capacitors one end are connected between the 6th inductance and third inductance, other end ground connection.
Preferably, the BST ceramics compression capacitor be two or even number, two or even number BST ceramics it is pressure-sensitive
Capacitor can be connected in series with or be connected in parallel into identical two groups, be respectively used to two resonant tanks.
Preferably, divider resistance of the biasing circuit by isolation resistance and with temperature compensation function is formed.
A kind of LC electricity tune bandstop filter hinders tuning frequency selection circuit, biasing circuit, voltage control including sequentially connected band
Circuit and frequency coding memory, the band resistance tunes is provided with the BST compression capacitors as tuned cell on frequency selection circuit
Group is provided with D/A converters on voltage control circuit, and the control code that control system is sent out is transferred to electricity by frequency coding memory
The D/A converters of control circuit are pressed, voltage control circuit the output phase should control voltage, and control voltage is passed by biasing circuit
The defeated BST compression capacitor groups for arriving band resistance tuning frequency selection circuit, control BST compression capacitors groups be tuned to corresponding frequencies.
Preferably, the BST compression capacitors group includes one or more BST ceramics compression capacitors, one or more
BST ceramics compression capacitors are connected in series with or are connected in parallel into one group.
Preferably, the band resistance tuning frequency selection circuit includes an inductor and one group of tuning BST compression capacitor,
Inductance one end is connected to input terminal, and the other end is grounded after being connected with one group of tuning with BST compression capacitors.
Preferably, divider resistance of the biasing circuit by isolation resistance and with temperature compensation function is formed.
Preferably, the LC electricity tune bandstop filter is connected on LC electrically adjusted band-pass filters both ends, to further improve
Big signal interference ability outside anti-frequency band.
Compared with prior art, the advantage of the invention is that：Electrically adjusted band-pass filter of the present invention and electricity adjust bandstop filter
It is low in energy consumption, small, more at low cost than switched capacitor array formula bounce frequency filter, it is (more logical than varactor electrically tunable filter dynamic
Normal ＜ 10dBm) greatly, up to 33-34dBm, especially suitable for hand-held or backpack communication station.
Description of the drawings
Fig. 1 is the circuit structure block diagram of the present invention；
Fig. 2 is band-pass tuning frequency selection circuit figure in Fig. 1；
Fig. 3 is band resistance tuning frequency selection circuit figure in Fig. 1；
Fig. 4 is standard capacitance Coupled-Resonance Bandpass Filter circuit diagram；
Fig. 5 is standard inductance Coupled-Resonance Bandpass Filter circuit diagram；
Fig. 6 couples dual-tuning band pass filter circuit diagram for standard inductance；
Circuit inductance couples dual-tuning band pass filter circuit diagram when Fig. 7 is fH；
Circuit inductance couples dual-tuning band pass filter circuit diagram when Fig. 8 is fL；
Fig. 9 is final compound inductive coupling dual-tuning band pass filter circuit diagram after the loading of input and output Γ types；
Figure 10 is tunable band-stop filter circuit diagram；
Figure 11 is the series connection application circuit of BST ceramics compression capacitors；
Figure 12 is the application circuit in parallel of BST ceramics compression capacitors；
Figure 13 is 470MHz-3000MHz variable band-pass filter circuit diagrams；
Figure 14 is 30MHz-512MHz variable band-pass filter circuit diagrams；
Figure 15 is 30MHz variable band-pass filter performance plots；
Figure 16 is 40MHz variable band-pass filter performance plots；
Figure 17 is 50MHz variable band-pass filter performance plots；
Figure 18 is 800MHz variable band-pass filter performance plots；
Figure 19 is 600MHz variable band-pass filter performance plots；
Figure 20 is 470MHz variable band-pass filter performance plots；
Figure 21 is 108MHz tunable band-stop filter performance plots；
Figure 22 is 174MHz tunable band-stop filter performance plots；
Figure 23 is 800MHz bandpass filter front and back belt 1/2f0 rejector circuit figures；
Figure 24 is 800MHz bandpass filter front and back belt 1/2f0 bandstop filter performance plots；
Figure 25 is 600MHz bandpass filter front and back belt 1/2f0 rejector circuit figures；
Figure 26 is 600MHz bandpass filter front and back belt 1/2f0 bandstop filter performance plots；
Figure 27 is 470MHz bandpass filter front and back belt 1/2f0 rejector circuit figures；
Figure 28 is 470MHz bandpass filter front and back belt 1/2f0 bandstop filter performance plots；
Figure 29 inhibits, while front and back belt 1/2f0 rejector circuit figures for 800MHz bandpass filters band 2f0；
Figure 30 inhibits, while front and back belt 1/2f0 bandstop filter performance plots for 800MHz bandpass filters band 2f0；
Figure 31 inhibits, while front and back belt 1/2f0 rejector circuit figures for 600MHz bandpass filters band 2f0；
Figure 32 inhibits, while front and back belt 1/2f0 bandstop filter performance plots for 600MHz bandpass filters band 2f0；
Figure 33 inhibits, while front and back belt 1/2f0 rejector circuit figures for 470MHz bandpass filters band 2f0；
Figure 34 inhibits, while front and back belt 1/2f0 bandstop filter performance plots for 470MHz bandpass filters band 2f0；
Figure 35 inhibits for 800MHz bandpass filters band 2f0, front and back belt 0.8f0 rejector circuit figures；
Figure 36 inhibits for 800MHz bandpass filters band 2f0, front and back belt 0.8f0 bandstop filter performance plots；
Figure 37 inhibits for 600MHz bandpass filters band 2f0, front and back belt 0.8f0 rejector circuit figures；
Figure 38 inhibits for 600MHz bandpass filters band 2f0, front and back belt 0.8f0 bandstop filter performance plots；
Figure 39 inhibits for 470MHz bandpass filters band 2f0, front and back belt 0.8f0 rejector circuit figures；
Figure 40 inhibits for 470MHz bandpass filters band 2f0, front and back belt 0.8f0 bandstop filter performance plots；
Figure 41 is band 0.8f0, rear band 1.6f0 rejector circuit figures before 470MHz bandpass filters；
Figure 42 is band 0.8f0, rear band 1.6f0 bandstop filter performance plots before 470MHz bandpass filters；
Figure 43 is band 0.8f0, rear band 1.6f0 rejector circuit figures before 600MHz bandpass filters；
Figure 44 is band 0.8f0, rear band 1.6f0 bandstop filter performance plots before 600MHz bandpass filters；
Figure 45 is band 0.8f0, rear band 1.6f0 rejector circuit figures before 800MHz bandpass filters；
Figure 46 is band 0.8f0, rear band 1.6f0 bandstop filter performance plots before 800MHz bandpass filters.
Specific embodiment
The present invention will be further described with reference to the accompanying drawings.
Referring to Fig. 1, LC electrically adjusted band-pass filters of the invention, including sequentially connected band-pass tuning frequency selection circuit, biasing
Circuit, voltage control circuit and frequency coding memory are provided with as tuned cell on the band-pass tuning frequency selection circuit
BST ceramics compression capacitors are provided with D/A converters on voltage control circuit, and frequency coding memory sends out control system
Control code be transferred to the D/A converters of voltage control circuit, voltage control circuit the output phase should control voltage, and will control electricity
Pressure is transferred to the BST ceramics compression capacitors of band-pass tuning frequency selection circuit by biasing circuit, controls BST ceramics compression capacitors
Be tuned to corresponding frequencies.
Voltage is controlled to be compiled by the bias supply voltage control circuit with D/A converters and the frequency with field-programmable is configured
Code memory provides.When communication station works, during if desired for emitting or receive the signal of some frequency, by the control system in radio station
As soon as sending out a control code to the frequency coder of field-programmable, which gives D/A converters one instruction, the output phase pair
Voltage should be controlled, which is added to by biasing circuit on BST compression capacitors, is made on capacitance tuning to corresponding frequencies.
Actual fabrication process passes through the relationship of frequency-capacitance-bias voltage inclined just on the contrary, be after circuit debugging qualification
Circuits and D/A converters become data, and field programmable memory is written.
Specific embodiment one
Referring to Fig. 2, Fig. 4-Fig. 9 and Figure 13-20, the band-pass tuning frequency selection circuit include seven high Q fixed inductances, two groups
The double-tuned circuit that the ceramic compression capacitor of adjustable BST (barium strontium titanate) is formed, first, second and third inductance is from input terminal to output
End is sequentially connected in series, and the 4th inductance one end is connected to input terminal, other end ground connection, and the 5th inductance one end is connected to the first inductance and the
Between two inductance, other end ground connection, the 6th inductance one end is connected between the second inductance and third inductance, other end ground connection, the
Seven inductance one end are connected to output terminal, other end ground connection, first group of BST ceramics compression capacitors one end be connected to the first inductance and
Between 5th inductance, other end ground connection, second group of BST ceramics compression capacitors one end be connected to the 6th inductance and third inductance it
Between, other end ground connection, divider resistance of the biasing circuit by isolation resistance and with temperature compensation function is formed.
Referring to according to common two kinds of parallel resonance band pass filter circuits：Capacitive coupling resonance bandpass filter and inductance coupling
Close resonance bandpass filter.It, can be by capacitive coupling resonance band pass filter circuit and inductance coupling according to the principle of duality of two circuits
Close resonance band pass filter circuit parameter.Data analysis shows inductive coupling double tunning parallel resonance bandpass filter in Lp, L12
When fixed, as CP ∝ 1/ (f0)2When, relative bandwidth remains unchanged, and Ls is varied from, and the double tune of standard inductance coupling are given below
The design formula of humorous bandpass filter：
After selected L0, G0 (G0=1/Z0), to given relative bandwidth w, have
To maximally-flat characteristic C2=C1,g0=1, g1=g2=1.4142
Coupled capacitor
C12=J12/ω0
Quiet shunt capacitance C0=Cr-C1’-C12
C1,=C1/[1+(ω0C1/G)2]
Inductance capacitance is exchanged into L0→Cr
L0=1/ ω0 2Cr,Ci→Li,
Selected CP、Z0Afterwards, to given relative bandwidth w, have
LP=(1/Lr–1/L1’-1/L12)-1
To maximally-flat characteristic, g0=1, g1=g2=1.4142
Lp=(1/Lr-1/L1’-1/L12)-1
L1'=L1×[1+(Z0/ω0L1)2]
Work as ω0During change, ∵ Cp∝1/(2πf0)2
∴Lr、L12It is constant.
To design variable band-pass filter, adjustable frequency range fH and fL are covered, keeps BW3db/fo=w relative bandwidths not
Become, and inputted in the range of fH-fL, method there are two types of the holdings well of output voltage standing-wave ratio：
First, the relatively low Lp values of selection, make Cp sufficiently large, make Ls under fH and fLfLWith LsfHDifference is smaller, and this method is applicable in
It, can be without adding input and output matching circuit, centre frequency fo selections (fH × fL of design in PIN switched capacitor array circuits
)1/2；
Second is that requiring the smaller situations of Cp (the presently commercially available maximum capacity 8.2pf of such as BST, even if 10 parallel connections, also only have
82pf), Ls under fH and fL can be causedfL＞ ＞ LsfH, it is necessary to additional Γ types or T-shaped high-pass filtering circuit improve input, output
Match, while the squareness factor of inductive coupling dual-tuning band pass filter low frequency end can be improved, wherein Γ mode filters are more suitable for
LsfLWith LsfHLarger situation is differed, at this time to ensure the input of fH, fL both ends, output voltage standing wave relatively, that is, is ensured whole
Matching status optimizes in a BREATHABLE BANDWIDTH, the centre frequency fo of final design not reselection (fH × fL)1/2, and use as follows
Method obtains fo.
Circuit structure adds Γ type high-pass filter groups by the input of standard inductance coupling dual-tuning band pass filter, output terminal
Into.
Design program：According to BW3db/fo and the adjustable upper and lower limit dual-tuning band pass filter Frequency Index of fH, fL, a is selected
× BW3dB/fo, a ≈ 1.1-2, selected LP1 are simultaneously fixed, and the standard inductance coupling double tunning band logical filter under fH and fL is obtained
Wave device circuit diagram 7, Fig. 8.Corresponding LS1f0=LS1fH+ (LS1fL-LS1fH)/[(fH/fL)+1], the corresponding fo that is obtained is in design
By 2 π fo × LP2=100 Ω, LP2 is obtained, by LS1 in frequency of heartfo- bLP2=LS1fo, b=0.35-0.65, by the final of fo
Compound circuit Fig. 9, ADS emulation, adjust b sizes, make during fH and fL that S11 is of substantially equal (to ensure that wave filter is defeated in tunable band
Enter, output voltage standing-wave ratio optimizes), it, can basis since Γ type high pass load networks make the usual bandwidth of final 3dB have compression
ADS simulation results correct a values, it is ensured that final design meets BW3dB/fo requirements.
Using the LC variable band-pass filters of BST ceramics compression capacitors, relative bandwidth BW3dB/fo is kept to be basically unchanged.
The design of capacitance swing and capacitance no-load voltage ratio for commercially available BST ceramics compression capacitor≤3.5.Table Isosorbide-5-Nitrae 70MHz-3000MHz systems
Row variable band-pass filter, BW3dB/fo=5% circuit parameters；Table 2,30MHz-512MHz series variable band-pass filters,
BW3dB/fo=5% and 10% circuit parameter, actual measurement input dynamic P-1 reach 34dBm.
Table 1
Table 2
Specific embodiment two
Referring to Figure 11, the BST ceramics compression capacitor is two, and two BST ceramics compression capacitors are serially connected in
Identical two groups, are respectively used to two resonant tanks.R1 is isolation resistance in figure, and R2/R3 is bias bleeder formula resistance, can be incited somebody to action
BST ceramics compression capacitor effective voltages increment amplifies, can be to the temperature of bandpass filter when R2/R3 uses thermistor
Degree characteristic compensates, remaining is identical with embodiment one.
Specific embodiment three
Referring to Figure 12, the BST ceramics compression capacitor is two, and two BST ceramics compression capacitors are connected in parallel into
Identical two groups, are respectively used to two resonant tanks.R4 is isolation resistance in figure, and R5/R6 is bias bleeder formula resistance, can be incited somebody to action
BST ceramics compression capacitor effective voltages increment amplifies, can be to the temperature of bandpass filter when R5/R6 uses thermistor
Degree characteristic compensates, remaining is identical with embodiment one.
Specific embodiment four
Referring to Fig. 3, Figure 10, Figure 21 and Figure 22, a kind of LC electricity tune bandstop filter hinders tuning choosing including sequentially connected band
Frequency circuit, biasing circuit, voltage control circuit and frequency coding memory, the band resistance, which tunes to be provided on frequency selection circuit, to be used as
The BST compression capacitors of tuned cell are provided with D/A converters on voltage control circuit, and frequency coding memory, which will control, is
The control code sent out of uniting is transferred to the D/A converters of voltage control circuit, and voltage control circuit the output phase should control voltage, and will
Control voltage is transferred to the BST compression capacitors with resistance tuning frequency selection circuit by biasing circuit, controls BST compression capacitor tune
Humorous to arrive corresponding frequencies, the BST compression capacitors group includes one or more BST ceramics compression capacitors, one or more BST potteries
Porcelain compression capacitor is connected in series with or is connected in parallel into one group, and the band resistance tuning frequency selection circuit includes an inductor and one group
Tuning BST ceramics compression capacitors, inductance one end is connected to input terminal, the other end and one group of tuning BST compression capacitor
It is grounded after series connection.Divider resistance of the biasing circuit by isolation resistance and with temperature compensation function is formed.
The calculation formula of circuit parameter is given below：
Lp=(Z0/2+ESR)/(2 π × BW3dB)
Cp=1/ [(2 π f0)2×Lp]
ESR is the equivalent series resistance that Lp or Cp is introduced, when Lp is fixed, and Cp changes, rejector circuit topology
There is the characteristic that BW3dB absolute bandwidths remain unchanged.Cp can be realized that (corresponding ESR switchs logical with PIN by PIN switched capacitor arrays
It is disconnected to be varied from, be varied from so as to influence BW3dB bandwidth of rejection).The present invention is using BST ceramics compression capacitors, than PIN
Switched capacitor array BW3dB variations are small, and can bear bigger input power, and upper operational frequency limit higher.
Using the LC tunable band-stop filters (as ESR=0) of BST ceramics compression capacitors, circuit parameter is shown in Table 3,30-
1500MHz LC tunable band-stop filter parameters.
Table 3
Specific embodiment five
Referring to Figure 23-46, the LC electricity tune bandstop filter is connected on LC electrically adjusted band-pass filters both ends, i.e. LC electricity tune band
It directly connects before and after bandpass filter the LC electricity tune bandstop filter, to further improve big signal interference ability outside anti-frequency band.
The LC electricity tune bandstop filter can also be individually used for electronic countermeasure broadband receiving system or ultra wide band (UWB) communication system,
Effectively inhibit the big interference signal such as frequency modulation broadcasting and television broadcasting signal.The LC electricity tune bandstop filter can be with LC electricity tune band logicals
Filter synchronization can also be provided sunken by frequency modulation such as f0/2 or 2/3f0 according to the outer big interference signal of band that background scene scanning obtains
Wave instructs, and bandstop filter is made to be operated in corresponding frequencies.
470-800MHz bandpass filter front and back belt 235-400MHz bandstop filters (10MHz bandwidth of rejection), circuit and
Characteristic is shown in Table 4.
Table 4
470-800MHz bandpass filters band 2f0 inhibits front and back belt 235-400MHz bandstop filter (10MHz stopband bands
It is wide), circuit and characteristic are shown in Table 5.
Table 5
470-800MHz bandpass filters band 2f0 inhibits, front and back belt 313.3-533.3MHz bandstop filters
(20.408MHz bandwidth), circuit and characteristic are shown in Table 6.
Table 6
Band 0.8f0 traps BRF (20.48MHz bandwidth) before 470-800MHz bandpass filters, rear band 1.6f0 traps BRF
(81.92MHz bandwidth), circuit and characteristic are shown in Table 7.
Table 7
Above-described embodiment is presently preferred embodiments of the present invention, is not the limitation to technical solution of the present invention, as long as
Without the technical solution that creative work can be realized on the basis of above-described embodiment, it is regarded as falling into patent of the present invention
Rights protection scope in.
Claims (2)
1. a kind of LC electrically adjusted band-pass filters, it is characterised in that：Including sequentially connected band-pass tuning frequency selection circuit, biased electrical
Road, voltage control circuit and frequency coding memory are provided with the BST as tuned cell on the band-pass tuning frequency selection circuit
Ceramic compression capacitor is provided with D/A converters, the control that frequency coding memory sends out control system on voltage control circuit
Code processed is transferred to the D/A converters of voltage control circuit, and voltage control circuit the output phase should control voltage, and control voltage is led to
Cross the BST ceramics compression capacitors that biasing circuit is transferred to band-pass tuning frequency selection circuit, the compression capacitor tuning of control BST ceramics
To corresponding frequencies；The band-pass tuning frequency selection circuit includes seven high Q fixed inductances, two adjustable BST ceramics compression capacitors
The double-tuned circuit that group is formed, first, second and third inductance are sequentially connected in series from input terminal to output terminal, and the 4th inductance one end is connected to
Input terminal, other end ground connection, the 5th inductance one end are connected between the first inductance and the second inductance, other end ground connection, the 6th electricity
Sense one end is connected between the second inductance and third inductance, and other end ground connection, the 7th inductance one end is connected to output terminal, the other end
Ground connection, first group of BST ceramics compression capacitors one end are connected between the first inductance and the 5th inductance, other end ground connection, and second
Group BST ceramics compression capacitors one end is connected between the 6th inductance and third inductance, other end ground connection；The BST ceramics pressure
Quick capacitor is two or even number, and two or even number BST ceramics compression capacitor can be connected in series with or be connected in parallel into
Identical two groups, are respectively used to two resonant tanks；Partial pressure electricity of the biasing circuit by isolation resistance and with temperature compensation function
Resistance is formed.
2. a kind of LC electricity tune bandstop filter, it is characterised in that：Tuning frequency selection circuit, biased electrical are hindered including sequentially connected band
Road, voltage control circuit and frequency coding memory, the band resistance tunes is provided with the BST as tuned cell on frequency selection circuit
Compression capacitor group is provided with D/A converters, the control that frequency coding memory sends out control system on voltage control circuit
Code is transferred to the D/A converters of voltage control circuit, and voltage control circuit the output phase should control voltage, and control voltage is passed through
Biasing circuit is transferred to the BST compression capacitor groups with resistance tuning frequency selection circuit, control BST compression capacitors group be tuned to it is corresponding
Frequency；The BST compression capacitors group includes one or more BST ceramics compression capacitors, the pressure-sensitive electricity of one or more BST ceramics
Container is connected in series with or is connected in parallel into one group；The band resistance tuning frequency selection circuit includes an inductor and one group of tuning is used
BST compression capacitors, inductance one end are connected to input terminal, and the other end is grounded after being connected with one group of tuning with BST compression capacitors；
Divider resistance of the biasing circuit by isolation resistance and with temperature compensation function is formed.
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| CN109819299B (en) * | 2017-11-22 | 2021-03-05 | 华为技术有限公司 | High-pass filter circuit, high-pass filter and digital television receiving terminal |
| CN112311349B (en) * | 2020-09-25 | 2024-03-01 | 南京熊猫电子股份有限公司 | Pressure-sensitive capacitance frequency hopping filter based on barium strontium titanate |
| CN112397858B (en) * | 2020-11-03 | 2022-04-05 | 同方电子科技有限公司 | Ultrashort wave quadruplex ware |
| CN112311356A (en) * | 2020-11-19 | 2021-02-02 | 成都菲斯洛克电子技术有限公司 | Miniaturized GHz high-power antenna front-end device group |
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| Publication number | Publication date |
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| CN105991105A (en) | 2016-10-05 |
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