CN102420583A - Radio frequency filter on basis of variable transconductance operational amplifier - Google Patents
Radio frequency filter on basis of variable transconductance operational amplifier Download PDFInfo
- Publication number
- CN102420583A CN102420583A CN2011103966087A CN201110396608A CN102420583A CN 102420583 A CN102420583 A CN 102420583A CN 2011103966087 A CN2011103966087 A CN 2011103966087A CN 201110396608 A CN201110396608 A CN 201110396608A CN 102420583 A CN102420583 A CN 102420583A
- Authority
- CN
- China
- Prior art keywords
- active
- filter
- matrix
- negative resistance
- inductance
- 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
Landscapes
- Networks Using Active Elements (AREA)
Abstract
The invention discloses a radio frequency filter on the basis of a variable transconductance operational amplifier, which comprises a negative resistance matrix and an active LC (inductance capacitance) filter which are connected in parallel, wherein the the active LC filter is formed in a mode that an active inductance matrix is connected in parallel with a capacitance; an active inductance variation range of the active inductance matrix is configurated by a digital control signal provided by an external controller, and the active inductance matrix is controlled by an analog control signal provided by the external controller to continuously change in the currently selected active inductance variation range, so that the aim of continuously changing an active inductance value is fulfilled; and a negative resistance variation range of the negative resistance matrix is configurated by the digital control signal provided by the external controller, the negative resistance matrix is controlled by the analog control signal to continuously change in the negative resistance variation range, the loss of the active LC filter is counteracted, and the Q value of the active LC filter is ensured. After the radio frequency filter is adopted, the defects of low Q value and single working frequency range of the active filter are overcome. The radio frequency filter can work in the wide frequency band range. The Q value of the radio frequency filter is kept at a high level in the whole frequency band.
Description
Technical field
The invention belongs to the RF IC technology, be specially a kind of radio-frequency filter based on the variable transconductance operational amplifier.Radio-frequency filter is one of key modules of Radio over Fiber (ROF) broadband wireless network, also is one of key modules of conventional wireless network simultaneously, like Wlan, and cordless communication networks such as GSM.
Background technology
Existing radio-frequency filter is divided into active and passive two big types.Passive filter mainly is represented as the LC filter, and its main feature is that the Q value is high, and noise is low, does not need additional supply, but is difficult to integrated, particularly like this in low-frequency range, thereby can't satisfy the demand of Modern Communication System miniaturization; Active filter results from 1938 the earliest; But, be not widely used the development of advancing by leaps and bounds along with microelectric technique in recent years because technology is at that time limit; We can be integrated into active filter on the wafer; Satisfy the requirement of Modern Communication System miniaturization, but it is low to face the Q value mostly, the single bottleneck that waits of operating frequency range.
Summary of the invention
The object of the present invention is to provide a kind of radio-frequency filter, it is low that this radio-frequency filter has overcome active filter Q value, and the defective that operating frequency range is single can be worked in the wideband segment limit, and make its Q value on whole frequency, remain on a higher level.
A kind of radio-frequency filter provided by the invention is characterized in that, this radio-frequency filter comprises negative resistance matrix and the active LC filter that is connected in parallel; Active LC filter is made up of active inductance matrix and electric capacity parallel connection;
First digital controlled signal configuration active inductance excursion that the active inductance matrix is provided by peripheral control unit; First analog control signal control active inductance matrix that is provided by peripheral control unit changes in the current active inductance excursion that is chosen continuously, reaches the purpose of the sense value that continuously changes active inductance;
The negative resistance value excursion of second digital controlled signal configuration negative resistance matrix that peripheral control unit provides; Second analog control signal control negative resistance matrix changes in negative resistance value excursion continuously; Offset the loss of active LC filter, guarantee the Q value of active LC filter.
The present invention is a source with traditional LC passive RF filter, designs the passive RF filter that meets wideband section centre frequency performance requirement earlier, the requirement of conversion inductance numeric area and Q value thereof on whole wideband section then.Replace the inductance in the traditional LC passive filter with controlled active inductance matrix then, realize the controlled filtering of wideband section, the Q value of using the Q value to develop skill at last to improve active inductance makes it reach the filter requirement.Wherein controlled active inductance is to utilize the gyrator of variable transconductance operational amplifier design to realize; Gyrator is a kind of of generalized impedance reverser; Because having impedance, gyrator falls contrary effect; It can turn round into inductance to electric capacity, and electric capacity is integrated more easily, simultaneously through changing the equivalence sense value that mutual conductance just can change active inductance.
In a word; The mode that the present invention adopts active inductance matrix and negative resistance matrix to combine reaches the purpose of wide working band, and the present invention has overcome the shortcoming of traditional active filter; The more important thing is and to adapt to the wideband section; Many standards, the filter function of miniaturization can better satisfy and ROF wireless communication system and traditional wireless communication system.
Description of drawings
Fig. 1 is the structural representation of the radio-frequency filter based on the variable transconductance operational amplifier provided by the invention;
Fig. 2 is the structural representation of active inductance matrix among Fig. 1;
Fig. 3 is the structural representation of negative resistance matrix among Fig. 1.
Embodiment
In order to help to understand the present invention, hereinafter will be explained concrete principle of the present invention with reference to Figure of description.But should be noted that these instances are not is the unique execution mode of the present invention, for example active inductance matrix or negative resistance matrix can be by the module replacements of other congenerous.
As shown in Figure 1, radio-frequency filter 13 provided by the invention is made up of negative resistance matrix 1 and the parallel connection of active LC filter, and active LC filter is made up of active inductance matrix 2 and electric capacity 3 parallel connections again.
Through all modules in first, second digital controlled signal 4,7 and first, second analog control signal 5, the 8 configuration radio-frequency filters 13, the effect of numeral and analog control signal is similar to coarse adjustment and fine tuning respectively to peripheral control unit 6 respectively.Digital controlled signal 4 is used to dispose the excursion of active inductance matrix 2, makes the active inductance work in the corresponding active inductance matrix accomplish layoutprocedure through sending enable signal.Analog control signal 5 is used to control active inductance matrix 2 to be changed in this excursion continuously, thereby realizes active LC filter selected working frequency points in a bigger frequency range.Analog control signal 5 can change continuously, therefore can continuously change the biasing in the operational transconductance amplifier in the active inductance, reaches the purpose of the sense value that continuously changes active inductance.
Digital controlled signal 7 makes the dynatron work in the corresponding negative resistance matrix through sending enable signal; The negative resistance value excursion of configuration negative resistance matrix 1; Change continuously in this scope to be used for analog control signal 8 control negative resistance matrixes 1; Thereby can in a bigger scope, offset the loss of active LC filter, in a wider frequency, guarantee the Q value of active LC filter.
Be illustrated in figure 2 as the internal structure of active inductance matrix 2 among Fig. 1, it is formed in parallel by n active inductance 11, and each active inductance is made up of a gyrator and an electric capacity, and each gyrator is by 14 end to end compositions of two variable transconductance operational amplifiers.Here need to prove that the structure of different active inductances is identical in the active inductance matrix, but the excursion of mutual conductance and capacitance size are different.The value of n is to decide according to the concrete frequency range of using.
Each 4.1～4.n in the digital controlled signal 4 all with the active inductance matrix in active inductance corresponding one by one, first digital controlled signal 4 sends the some or several active inductance work in the enable signal configuration active inductance; Second analog control signal 5 is chosen operational transconductance amplifier in the active inductance of work through change biasing changes its transconductance value, thus its equivalent sense value of continuous change.Under the cooperation control of first and second control signals 4,5, just realized that the sense value of active inductance changes in a bigger scope.
Fig. 3 is the structural representation of negative resistance matrix 1 among Fig. 1, and it is formed in parallel by m dynatron.The quantity of m will be decided according to the applicable cases of reality, confirms in the loss of different frequency range according to the active LC filter of reality usually, with the not absolute relation of n.
Each dynatron is composed in series with a tail current source 16 after being linked to each other by a pair of metal-oxide-semiconductor 15 intersections.The structure of each dynatron is the same, but its negative resistance excursion is different.Analog control signal 5 can change continuously, therefore can continuously change the mutual conductance of metal-oxide-semiconductor 15 in the dynatron, reaches the purpose of the resistance that continuously changes negative resistance
Each 7.1～7.m in the digital controlled signal 7, corresponding to different and unique dynatron, first digital controlled signal 7 is through sending the some or several dynatron work in the enable signal configuration negative resistance matrix; The biasing that second analog control signal 8 is chosen the dynatron tail current source of work through change changes the mutual conductance of metal-oxide-semiconductor 15, thus continuous change dynatron negative resistance value.Under the cooperation control of control signal 7 and 8, just realized that the negative resistance value of dynatron changes in a bigger scope; From can etc. effectively offset the loss of active LC filter, thereby can in a bigger operating frequency range, stablize the Q value of active LC filter.
The above is preferred embodiment of the present invention, but the present invention should not be confined to the disclosed content of this embodiment and accompanying drawing.So everyly do not break away from the equivalence of accomplishing under the disclosed spirit of the present invention or revise, all fall into the scope of the present invention's protection.
Claims (3)
1. a radio-frequency filter is characterized in that, this radio-frequency filter comprises negative resistance matrix and the active LC filter that is connected in parallel; Active LC filter is made up of active inductance matrix and electric capacity parallel connection;
First digital controlled signal configuration active inductance excursion that the active inductance matrix is provided by peripheral control unit; First analog control signal control active inductance matrix that is provided by peripheral control unit changes in the current active inductance excursion that is chosen continuously, reaches the purpose of the sense value that continuously changes active inductance;
The negative resistance value excursion of second digital controlled signal configuration negative resistance matrix that peripheral control unit provides; Second analog control signal control negative resistance matrix changes in negative resistance value excursion continuously; Offset the loss of active LC filter, guarantee the Q value of active LC filter.
2. radio-frequency filter according to claim 1; It is characterized in that; The active inductance matrix is formed in parallel by a plurality of active inductances, and each active inductance is made up of a gyrator and an electric capacity, and each gyrator is by two variable transconductance operational amplifier end to end compositions.
3. radio-frequency filter according to claim 1 and 2 is characterized in that the negative resistance matrix is formed in parallel by some dynatrons, and each dynatron is composed in series with a tail current source after being linked to each other by a pair of metal-oxide-semiconductor intersection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011103966087A CN102420583A (en) | 2011-12-02 | 2011-12-02 | Radio frequency filter on basis of variable transconductance operational amplifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011103966087A CN102420583A (en) | 2011-12-02 | 2011-12-02 | Radio frequency filter on basis of variable transconductance operational amplifier |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102420583A true CN102420583A (en) | 2012-04-18 |
Family
ID=45944845
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011103966087A Pending CN102420583A (en) | 2011-12-02 | 2011-12-02 | Radio frequency filter on basis of variable transconductance operational amplifier |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102420583A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107425824A (en) * | 2017-08-25 | 2017-12-01 | 华大半导体有限公司 | The regulation circuit and method of the stability of inductance |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4659995A (en) * | 1983-08-12 | 1987-04-21 | Karl-Heinz Feistel | Active fourth-degree filter element |
| CN1906850A (en) * | 2004-01-20 | 2007-01-31 | 瑞科信公司 | Integrated tunable filter for broadband tuner |
| CN101222214A (en) * | 2006-11-17 | 2008-07-16 | 美国凹凸微系有限公司 | Apparatus and method for tuning a band pass filter |
| CN101447777A (en) * | 2008-12-26 | 2009-06-03 | 哈尔滨工业大学 | Multimode multi-frequency radio frequency active integrated filter adopting active inductances |
| CN102111123A (en) * | 2011-01-07 | 2011-06-29 | 清华大学 | Suspension difference active inducer based on positive feedback |
| CN202385062U (en) * | 2011-12-02 | 2012-08-15 | 华中科技大学 | Radio frequency filter based on variable transconductance operational amplifier |
-
2011
- 2011-12-02 CN CN2011103966087A patent/CN102420583A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4659995A (en) * | 1983-08-12 | 1987-04-21 | Karl-Heinz Feistel | Active fourth-degree filter element |
| CN1906850A (en) * | 2004-01-20 | 2007-01-31 | 瑞科信公司 | Integrated tunable filter for broadband tuner |
| CN101222214A (en) * | 2006-11-17 | 2008-07-16 | 美国凹凸微系有限公司 | Apparatus and method for tuning a band pass filter |
| CN101447777A (en) * | 2008-12-26 | 2009-06-03 | 哈尔滨工业大学 | Multimode multi-frequency radio frequency active integrated filter adopting active inductances |
| CN102111123A (en) * | 2011-01-07 | 2011-06-29 | 清华大学 | Suspension difference active inducer based on positive feedback |
| CN202385062U (en) * | 2011-12-02 | 2012-08-15 | 华中科技大学 | Radio frequency filter based on variable transconductance operational amplifier |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107425824A (en) * | 2017-08-25 | 2017-12-01 | 华大半导体有限公司 | The regulation circuit and method of the stability of inductance |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101950827A (en) | Branch node loaded ultra wideband microwave filter | |
| CN202435391U (en) | Hand-held terminal | |
| CN105553494A (en) | Radio frequency front-end frequency selection circuit and signal receiving method thereof | |
| CN110719074A (en) | Tunable broadband low-noise amplifier | |
| CN202385062U (en) | Radio frequency filter based on variable transconductance operational amplifier | |
| CN103956989B (en) | A kind of multimode multi-frequency restructural Gm C complex filters | |
| CN111130466A (en) | Frequency-adjustable broadband low-noise amplifier | |
| CN104022750A (en) | Broadband electrically tunable filter circuit | |
| CN102377025A (en) | Antenna module and impedance matching method thereof | |
| CN101615892A (en) | Radio frequency power amplifier | |
| CN202696545U (en) | Linear wideband high-frequency power amplifier | |
| CN102946235A (en) | Lumped parameter dual-band-pass filter | |
| CN102075154B (en) | Low-power consumption programmable gain amplifier device | |
| CN102638239A (en) | Capacitive coupling lumped parameter three-band pass filter | |
| CN102420583A (en) | Radio frequency filter on basis of variable transconductance operational amplifier | |
| CN105281673A (en) | Multi-band reconfigurable mixing method and mixer | |
| WO2023202310A1 (en) | Power amplifier and input matching network thereof | |
| WO2024007728A1 (en) | Matching circuit and power amplification circuit | |
| CN204304932U (en) | Radio-frequency power amplifier output matching circuit | |
| CN208904969U (en) | Filtering framework is strengthened in a kind of radio-frequency power amplifier and its matching | |
| TWI483542B (en) | Amplifier circuit | |
| CN104901641A (en) | Power amplification structure | |
| CN102377404A (en) | Variable impedance matching circuit | |
| CN214675079U (en) | Radio frequency phase shifter based on cascode amplifier | |
| CN101447777B (en) | Multimode multi-frequency radio frequency active integrated filter adopting active inductances |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20120418 |