CN105680898A - Circuit for perfecting performance of mobile terminal - Google Patents
Circuit for perfecting performance of mobile terminal Download PDFInfo
- Publication number
- CN105680898A CN105680898A CN201610011839.4A CN201610011839A CN105680898A CN 105680898 A CN105680898 A CN 105680898A CN 201610011839 A CN201610011839 A CN 201610011839A CN 105680898 A CN105680898 A CN 105680898A
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- Prior art keywords
- circuit
- mobile terminal
- capacitance
- nonlinear device
- terminal performance
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
- H04B1/50—Circuits using different frequencies for the two directions of communication
- H04B1/52—Hybrid arrangements, i.e. arrangements for transition from single-path two-direction transmission to single-direction transmission on each of two paths or vice versa
- H04B1/525—Hybrid arrangements, i.e. arrangements for transition from single-path two-direction transmission to single-direction transmission on each of two paths or vice versa with means for reducing leakage of transmitter signal into the receiver
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Amplifiers (AREA)
Abstract
This invention provides a circuit for perfecting the performance of a mobile terminal. The circuit is applied to a radio frequency circuit containing a DC component, the circuit comprises: a radio frequency module provided with a nonlinear device; and an LC parallel resonance circuit, wherein one end of the LC parallel resonance circuit is connected with a nonlinear output end of the nonlinear device, and the other end of the LC parallel resonance circuit is grounded through a first stopping condenser. W hen a signal in the mobile terminal generates secondary harmonic and other nonlinear distortions by the nonlinear device, due to the property of infinite impedance of the LC parallel resonance circuit to the fundamental wave and the short circuit property to the secondary harmonic, the secondary harmonic can be effectively perfected without influencing the fundamental wave. The first stopping condenser connected with the other end of the LC parallel resonance circuit can avoid a DC ground short circuit phenomenon, so that the circuit can be used in the circuit containing the DC component, and then the purpose of perfecting the secondary harmonic of the mobile terminal is achieved.
Description
Technical field
The present invention relates to a kind of communication technical field, particularly relate to a kind of circuit that improves mobile terminal performance.
Background technology
Along with scientific and technological progress and social development, as the mobile terminal devices such as mobile phone have become essential in people's daily lifeProduct are corresponding also more and more higher for the requirement of mobile terminal device.
But, non-owing to all needing in the radio-frequency module of current mobile terminal equipment to be provided with such as power amplifier, low-noise amplifier etc.Linear unit, and these nonlinear devices all can produce such as second harmonic or higher hamonic wave etc. system works is produced at workThe interfering signal of raw adverse effect can present with the voltage that applies on this nonlinear device in the time that electric current is flowed through nonlinear deviceNonlinear relation, will form non-sinusoidal current, and then produces harmonic wave, and harmonic wave can produce interference to the channel closing on, fromAnd can produce adverse effects such as communication quality reduction system, even excessively strong interference causes the signal cannot be by normal demodulation.
In addition, the modulation signal using in the communication equipment of mobile terminal is generally the envelope signal with peak-to-average force ratio, and it can be given(in time domain, the characteristic of can be regarded as is over to now to bring serious memory effect for above-mentioned power amplifier (especially high-power power amplifier)The impact that characteristic produces), and memory effect can have a strong impact on such as power amplifier etc. and have the operating index of the device of memory characteristic.
For involving due to humorous the adverse effect that the factors such as memory effect cause on current mobile terminal equipment, industry is mainlyBy increasing low pass filter or bandpass filter, the interfering signal such as such as second harmonic producing in mobile terminal device is enteredRow suppresses, but can increase like this loss of mobile terminal device RF output end, the i.e. power to mobile terminal device and effectThe requirement of rate is all higher, for the inhibition of harmonic wave, especially for comprise the second harmonic that produces in flip-flop module andThe inhibition of memory effect has become the difficult point of current industry.
For addressing the above problem, when radio circuit by comprising flip-flop in design in prior art, tool is set in circuitHave radio-frequency module and the microstrip line of nonlinear device, microstrip line one end is connected with the non-linear output of nonlinear device, the other endBy capacitance ground connection; Wherein, the electrical length L=N × λ of microstrip line/2+ λ/4, N is natural number, λ is described radio frequencyThe carrier wavelength of circuit. To make this microstrip line present open-circuit characteristic for radio frequency first-harmonic, and for two of nonlinear device generationSubharmonic presents short circuit curve, and then suppresses the second harmonic in radio circuit.
But, although foregoing circuit structure can suppress the second harmonic in radio circuit, due to the sub-face of the shared pcb board of microstrip lineLong-pending too large, the pcb board wiring of original compact conformation has been had to more difficult requirement.
Therefore, how to provide a kind of second harmonic that can suppress in radio circuit, the less circuit structure of area again, becomes and works asOne of front problem demanding prompt solution.
Summary of the invention
The shortcoming of prior art in view of the above, the object of the present invention is to provide a kind of circuit that improves mobile terminal performance,While suppressing the second harmonic in radio circuit for solving prior art by microstrip line, due to the sub-face of the shared pcb board of microstrip lineLong-pending too large, cause the high problem of pcb board wiring difficulty.
For achieving the above object and other relevant objects, the invention provides a kind of circuit that improves mobile terminal performance, be applied to bagContaining in the radio circuit of flip-flop, described circuit comprises: radio-frequency module, has nonlinear device; LC antiresonant circuit,One end is connected with the non-linear output of described nonlinear device, and the other end is by the first capacitance ground connection.
In one embodiment of the invention, described nonlinear device is power amplifier, described LC antiresonant circuit and described power amplifierDrain electrode connects.
In one embodiment of the invention, the drain electrode of described power amplifier is also connected with the second capacitance, and described the second capacitanceIn parallel with described LC antiresonant circuit.
In one embodiment of the invention, the capacitance of described the first capacitance is greater than the capacitance of described the second capacitance.
In one embodiment of the invention, the capacitance rank of described the first capacitance is more than or equal to μ F rank.
In one embodiment of the invention, the capacitance scope of described the first capacitance is 0.1～10 μ F.
In one embodiment of the invention, described nonlinear device is low-noise amplifier, described LC antiresonant circuit and instituteThe non-linear output of stating low-noise amplifier connects.
In one embodiment of the invention, described the first capacitance is variable capacitance.
As mentioned above, the circuit that improves mobile terminal performance of the present invention, has following beneficial effect:
The application is applied to the radio circuit that comprises flip-flop, comprises with the circuit that improves mobile terminal performance: radio-frequency module,There is nonlinear device; LC antiresonant circuit, one end is connected with the non-linear output of described nonlinear device, and the other end is logicalCross the first capacitance ground connection. When signal in mobile terminal produces the non-linear distortions such as second harmonic through nonlinear device,Because LC antiresonant circuit presents the infinitely-great characteristic of impedance to first-harmonic, and second harmonic is presented to short circuit curve,Therefore the circuit that improves mobile terminal performance above-mentioned can, in the situation that not affecting first-harmonic, effectively improve second harmonic. And and LCThe first capacitance that the antiresonant circuit other end connects, can avoid the generation of direct current shorted to earth phenomenon, and then make thisThe circuit that improves mobile terminal performance can directly use in the circuit that contains flip-flop, and then reaches and improve mobile terminal twoThe object of subharmonic. Nonlinear device in mobile terminal (as power amplifier) curent change when carrier wave switches is larger, causesSupply current does not catch up with, and improves the first capacitance being connected with LC antiresonant circuit one end in the circuit of mobile terminal performanceCan store a large amount of electric charges, thus above-mentioned phenomenon can effectively be improved, and then improve the memory effect of nonlinear device.
Further, the size of LC antiresonant circuit is less, and the circuit that improves mobile terminal performance is in performance above-mentioned functionsMeanwhile, can effectively reduce it and occupy the area of mobile terminal pcb board, be beneficial to the cabling design of mobile terminal pcb board, profitLighter, thin in mobile terminal design.
Brief description of the drawings
Fig. 1 is shown as circuit that the present invention the improves mobile terminal performance structural representation in an embodiment.
Fig. 2 is shown as circuit that the present invention the improves mobile terminal performance structural representation in another embodiment.
Element numbers explanation
LNA low noise amplifier
M external device
Electric capacity in C1LC antiresonant circuit
Inductance in L1LC antiresonant circuit
C2 the first capacitance
GND ground wire
C3 the second capacitance
P power amplifier
The gate terminal of G power amplifier
The drain electrode end of D power amplifier
Detailed description of the invention
Below, by specific instantiation explanation embodiments of the present invention, those skilled in the art can be disclosed by this descriptionContent understand easily other advantages of the present invention and effect. The present invention can also add by other different detailed description of the inventionTo implement or application, the every details in this description also can, based on different viewpoints and application, not deviate from essence of the present inventionUnder god, carry out various modifications or change. It should be noted that, in the situation that not conflicting, the feature in following examples and embodimentCan mutually combine.
It should be noted that, the diagram providing in following examples only illustrates basic conception of the present invention in a schematic way, then figureIn formula, only show with assembly relevant in the present invention but not component count, shape and size drafting while implementing according to reality, in factWhen implement on border, kenel, quantity and the ratio of each assembly can be a kind of random change, and its assembly layout kenel also may more be answeredAssorted.
Refer to Fig. 1, the structural representation of the circuit that the present invention improves mobile terminal performance in an embodiment. The present embodiment withThe circuit that utilization improves mobile terminal performance suppresses for example the second harmonic of low-noise amplifier, to improving and move in the present inventionThe circuit of moving terminal capabilities describes. In Fig. 1, be applied in the radio circuit that comprises flip-flop, improve mobile terminalThe circuit of energy comprises:
Radio-frequency module, has nonlinear device;
LC antiresonant circuit, one end is connected with the non-linear output of described nonlinear device, and the other end passes through first every straight electricityHold ground connection.
In the present embodiment, the nonlinear device in radio-frequency module is low-noise amplifier LNA (LowNoiseAmplifier).It should be noted that, the present embodiment is only to describe as an example of low-noise amplifier example, but this low-noise amplifier replaceable be itHis nonlinear device.
Described LC antiresonant circuit comprises capacitor C 1 and inductance L 1, described capacitor C 1 and inductance L 1 parallel connection. Described LCAntiresonant circuit is connected with the non-linear output 0 of described low-noise amplifier LNA, and the other end is by the first capacitanceC2 ground connection GND. In LC antiresonant circuit,Wherein, f is fundamental frequency, L=L1 in formula,C=C1. F has determined the size of L1, C1.
In the present embodiment, the non-linear output 0 of low-noise amplifier LNA also with other equipment M (as mobile terminal is establishedEquipment for being connected normally to work with above-mentioned low-noise amplifier in standby radio-frequency module) connect.
In the present embodiment, the capacitance rank of described the first capacitance C2 is more than or equal to μ F rank.
Preferably, the capacitance scope of described the first capacitance C2 is 0.1～10 μ F. First capacitance C2 is too little can notStore enough electric charges, do not have the effect that reduces memory effect; The area of the too large shared plank of the first capacitance C2 is larger,Also have the withstand voltage restriction of electric capacity, in mobile terminal, can not effectively be applied.
In the present embodiment, through nonlinear device, (in the present embodiment, nonlinear device is low noise to the signal in mobile terminalAmplifier LNA) while producing the non-linear distortion such as second harmonic, due to LC antiresonant circuit, that first-harmonic is presented to impedance is infiniteLarge characteristic, and second harmonic is presented to short circuit curve, the circuit that improves mobile terminal performance therefore above-mentioned can not affect baseIn the situation of ripple, effectively improve second harmonic. And the first capacitance C2 being connected with the LC antiresonant circuit other end,Can avoid the generation of direct current shorted to earth phenomenon, and then this circuit that improves mobile terminal performance can directly contained directlyIn the circuit of stream composition, use, and then reach the object of improving mobile terminal second harmonic.
In addition, nonlinear device in mobile terminal (in the present embodiment, nonlinear device is low-noise amplifier LNA) is at carrier waveWhen switching, curent change is larger, causes supply current not catch up with, and improves in the circuit of mobile terminal performance in parallel with LCThe first capacitance that resonance circuit one end connects can store a large amount of electric charges, so can effectively improve above-mentioned phenomenon, Jin ErgaiThe memory effect of kind nonlinear device.
Further, the size of LC antiresonant circuit is less, and the circuit that improves mobile terminal performance is in performance above-mentioned functionsMeanwhile, can effectively reduce it and occupy the area of mobile terminal pcb board, be beneficial to the cabling design of mobile terminal pcb board, profitLighter, thin in mobile terminal design.
In another embodiment, described the first capacitance C2 also can be variable capacitance.
Refer to Fig. 2, the structural representation of the circuit that the present invention improves mobile terminal performance in another embodiment. The present embodimentThe circuit that improves mobile terminal performance to utilize suppresses as example the second harmonic of power amplifier, to improving mobile terminal in the present inventionThe circuit of performance describes. In Fig. 2, be applied in the radio circuit that comprises flip-flop, improve the electricity of mobile terminal performanceRoad comprises:
Radio-frequency module, has nonlinear device;
LC antiresonant circuit, one end is connected with the non-linear output of described nonlinear device, and the other end passes through first every straight electricityHold ground connection.
In the present embodiment, the nonlinear device in radio-frequency module is power amplifier P. Power amplifier P has gate terminal G and drain electrode end D. NeedBe noted that the present embodiment is only to describe as an example of power amplifier P example, but the also replaceable memory that has for other of this power amplifier PThe nonlinear device of characteristic.
Described LC antiresonant circuit comprises capacitor C 1 and inductance L 1, described capacitor C 1 and inductance L 1 parallel connection. Described LCOne end of antiresonant circuit is connected with the drain electrode end D of described power amplifier P, and the other end of described LC antiresonant circuit is by theOne capacitance C2 ground connection GND (ground wire).
In the present embodiment, the drain electrode end D of described power amplifier P is also connected with the second capacitance C3, and described the second capacitanceC3 is in parallel with described LC antiresonant circuit. The direct current of the second capacitance C3 for the drain electrode end D of power amplifier P is exportedIsolate.
Concrete, the capacitance of described the first capacitance C2 is greater than the capacitance of described the second capacitance C3.
In the present embodiment, the capacitance rank of described the first capacitance C2 is more than or equal to μ F rank.
Preferably, the capacitance scope of described the first capacitance C2 is 0.1～10 μ F. First capacitance C2 is too little can notStore enough electric charges, do not have the effect that reduces memory effect; The area of the too large shared plank of the first capacitance C2 is larger,Also have the withstand voltage restriction of electric capacity, in mobile terminal, can not effectively be applied.
In sum, the present invention is applied to the radio circuit that comprises flip-flop, comprises with the circuit that improves mobile terminal performance:Radio-frequency module, has nonlinear device; LC antiresonant circuit, one end is connected with the non-linear output of described nonlinear device,The other end is by the first capacitance ground connection. Signal process nonlinear device generation second harmonics in mobile terminal etc. are non-linearWhen distortion, because LC antiresonant circuit presents the infinitely-great characteristic of impedance to first-harmonic, and second harmonic is presented shortRoad characteristic, the circuit that improves mobile terminal performance therefore above-mentioned can, in the situation that not affecting first-harmonic, effectively improve second harmonic.And the first capacitance being connected with the LC antiresonant circuit other end can have been avoided the generation of direct current shorted to earth phenomenon,And then this circuit that improves mobile terminal performance can directly be used in the circuit that contains flip-flop, and then reach improve moveThe object of moving terminal second harmonic. In mobile terminal, nonlinear device curent change when carrier wave switches is larger, causes supplyingElectricity electric current does not catch up with, and improves the first capacitance energy being connected with LC antiresonant circuit one end in the circuit of mobile terminal performanceStore a large amount of electric charges, thus above-mentioned phenomenon can effectively be improved, and then improve the memory effect of nonlinear device. Further, the size of LC antiresonant circuit is less, improves the circuit of mobile terminal performance in performance above-mentioned functions, Neng GouyouEffect reduces it and occupies the area of mobile terminal pcb board, is beneficial to the cabling design of mobile terminal pcb board, is beneficial to mobile terminal and establishesThat counts is lighter, thin. So the present invention has effectively overcome various shortcoming of the prior art and tool high industrial utilization.
Above-described embodiment is illustrative principle of the present invention and effect thereof only, but not for limiting the present invention. Anyly be familiar with this skillThe personage of art all can, under spirit of the present invention and category, modify or change above-described embodiment. Therefore, such asUnder have in technical field conventionally know the knowledgeable do not depart under disclosed spirit and technological thought, complete all etc.Effect is modified or is changed, and must be contained by claim of the present invention.
Claims (8)
1. a circuit that improves mobile terminal performance, is characterized in that, is applied in the radio circuit that comprises flip-flop described electricityRoad comprises:
Radio-frequency module, has nonlinear device;
LC antiresonant circuit, one end is connected with the non-linear output of described nonlinear device, the other end by first everyStraight capacity earth.
2. the circuit that improves mobile terminal performance according to claim 1, is characterized in that, described nonlinear device is power amplifier,Described LC antiresonant circuit is connected with the drain electrode of described power amplifier.
3. according to the circuit that improves mobile terminal performance as claimed in claim 2, it is characterized in that, the drain electrode of described power amplifier also connectsHave the second capacitance, and described the second capacitance is in parallel with described LC antiresonant circuit.
4. the circuit that improves mobile terminal performance as claimed in claim 3, is characterized in that, the capacitance of described the first capacitanceBe greater than the capacitance of described the second capacitance.
5. the circuit that improves mobile terminal performance as claimed in claim 1, is characterized in that, the capacitance of described the first capacitanceRank is more than or equal to μ F rank.
6. the circuit that improves mobile terminal performance as claimed in claim 5, is characterized in that, the capacitance of described the first capacitanceScope is 0.1～10 μ F.
7. the circuit that improves mobile terminal performance as claimed in claim 1, is characterized in that, described nonlinear device is that low noise is putLarge device, described LC antiresonant circuit is connected with the non-linear output of described low-noise amplifier.
8. the circuit that improves mobile terminal performance as claimed in claim 1, is characterized in that, described the first capacitance is can power transformationHold.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610011839.4A CN105680898A (en) | 2016-01-08 | 2016-01-08 | Circuit for perfecting performance of mobile terminal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610011839.4A CN105680898A (en) | 2016-01-08 | 2016-01-08 | Circuit for perfecting performance of mobile terminal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105680898A true CN105680898A (en) | 2016-06-15 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610011839.4A Pending CN105680898A (en) | 2016-01-08 | 2016-01-08 | Circuit for perfecting performance of mobile terminal |
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| CN (1) | CN105680898A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108418593A (en) * | 2018-01-30 | 2018-08-17 | 广东欧珀移动通信有限公司 | Harmonic suppression apparatus and electronic device |
| CN108649991A (en) * | 2018-04-28 | 2018-10-12 | 维沃移动通信有限公司 | A kind of processing method and mobile terminal of harmonic wave interference |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1543066A (en) * | 2003-04-29 | 2004-11-03 | 台达电子工业股份有限公司 | Switchable high-frequency band filter |
| CN101789796A (en) * | 2009-08-10 | 2010-07-28 | 上海闻泰电子科技有限公司 | Filter circuit for inhibiting harmonic signal of mobile terminal and method therefor |
| CN104967436A (en) * | 2015-07-01 | 2015-10-07 | 上海斐讯数据通信技术有限公司 | Circuit for improving performance of mobile terminal |
-
2016
- 2016-01-08 CN CN201610011839.4A patent/CN105680898A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1543066A (en) * | 2003-04-29 | 2004-11-03 | 台达电子工业股份有限公司 | Switchable high-frequency band filter |
| CN101789796A (en) * | 2009-08-10 | 2010-07-28 | 上海闻泰电子科技有限公司 | Filter circuit for inhibiting harmonic signal of mobile terminal and method therefor |
| CN104967436A (en) * | 2015-07-01 | 2015-10-07 | 上海斐讯数据通信技术有限公司 | Circuit for improving performance of mobile terminal |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108418593A (en) * | 2018-01-30 | 2018-08-17 | 广东欧珀移动通信有限公司 | Harmonic suppression apparatus and electronic device |
| WO2019149070A1 (en) * | 2018-01-30 | 2019-08-08 | Oppo广东移动通信有限公司 | Harmonic suppression device and electronic device |
| CN108649991A (en) * | 2018-04-28 | 2018-10-12 | 维沃移动通信有限公司 | A kind of processing method and mobile terminal of harmonic wave interference |
| CN108649991B (en) * | 2018-04-28 | 2019-11-05 | 维沃移动通信有限公司 | A kind of processing method and mobile terminal of harmonic wave interference |
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Application publication date: 20160615 |