CN1801644A - RF front end structure - Google Patents
RF front end structure Download PDFInfo
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- CN1801644A CN1801644A CNA2004100817752A CN200410081775A CN1801644A CN 1801644 A CN1801644 A CN 1801644A CN A2004100817752 A CNA2004100817752 A CN A2004100817752A CN 200410081775 A CN200410081775 A CN 200410081775A CN 1801644 A CN1801644 A CN 1801644A
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Abstract
The RF front-end frame for transmitter comprises a RF front-end device, a TR switch to selective conduct the first and second signal transmission paths, an emission unit, a receive unit, and an adaption circuit selective arranged on said paths to couple TR switch and receive unit when on first path and the TR switch and emission unit when on second path and make receive and emission units achieve impedance matching with RF front-end device. Wherein, arranging all said constituents in one chip.
Description
Technical field
The present invention is relevant for a kind of radio-frequency front-end (RF front-end) framework of transmitter, especially about a kind of RF front end structure with integration transmitting switch and match circuit transmitter in chip.
Background technology
1A figure system shows a kind of RF front end structure of existing transmitter.Transmitter and front end structure 100 thereof are to be arranged on the printed circuit board (PCB) 10, comprise antenna ANT, first to the 3rd external matching circuit 12a～12c, transmit-receive switch (transmit/receive switch; TR switch) 14, receiving element 162 and transmitter unit 164, wherein receiving element 162 and transmitter unit 164 are to be integrated in the chip 16.In order to reach best efficiency, when transmitting signal, antenna ANT and transmitter unit 164 should reach impedance matching (impedance matching) by the first and the 3rd external matching circuit 12a and 12c, and when received signal, antenna ANT and receiving element 162 should reach impedance matching by first and second external matching circuit 12a and 12b.If do not match, will produce signal reflex and signal is consumed.1B figure system shows another kind of existing transmitter and front end structure 100 thereof, in this front end framework, has used double-pole double-throw (dual pole dual throw; SPDT) transmit-receive switch is done the selection of antenna ANT1 and antenna ANT2, and its operating principle is similar to the transport module among the 1A figure, the different double-pole double-throw transmit-receive switches 14 ' that have been to use.
The 2nd figure is the front end structure 200 that shows another kind of existing transmitter.For simplified design and dwindle the area of integral module, in transmitter front end framework 200, transmit-receive switch 14 is to be integrated in the chip 16 ', so that simplify the element on the printed circuit board (PCB) 20.Yet, only transmit-receive switch 14 is integrated in chip 16 ', can make the pin number (pin count) of chip 16 ' increase, and make and more be difficult to the layout configurations of external matching circuit 12a～12c that chip 16 ' is outside on printed circuit board, realize.For solving this problem, will consider usually the second external matching circuit 22b and the 3rd external matching circuit 22c are integrated into chip internal simultaneously, two match circuits will make the consume of signal become big but put in order into simultaneously, and increase considerably the area in the chip.
Summary of the invention
In view of this, purpose of the present invention, tie up in chip internal and integrated a transmit-receive switch and a match circuit, make in chip exterior, only need to use a match circuit, can reach the impedance matching (impedance matching) of receiving terminal and transmitting terminal simultaneously, the pin number order that does not only increase chip has reduced the pin number order of chip on the contrary, and significantly simplify the design of external matching circuit, also reduce the increase of using two loss of signal that inner match circuit caused and chip area simultaneously in addition.
For reaching above-mentioned purpose, one embodiment of the present of invention system provides a kind of RF front end structure of transmitter, comprises antenna assembly, transmit-receive switch, transmitter unit, receiving element and match circuit.Transmit-receive switch is optionally conducting first signal transmission path and secondary signal transmission path.Match circuit system in the chip optionally is arranged on first signal transmission path and the secondary signal transmission path, in the time of on being arranged at first signal transmission path, match circuit is coupled to transmit-receive switch and receiving element, in the time of on being arranged at the secondary signal transmission path, match circuit couples transmit-receive switch and transmitter unit, make receiving element and transmitter unit and antenna assembly reach impedance matching (impedance matching), wherein transmit-receive switch, transmitter unit, receiving element and match circuit system are arranged in the same chip.
For reaching above-mentioned purpose, an alternative embodiment of the invention system provides a kind of RF front end structure, is applied to transmitter, comprising: transmit-receive switch, optionally conducting first signal transmission path and secondary signal transmission path; Transmitter unit; Receiving element; Radio frequency front-end device; And match circuit, optionally be arranged on above-mentioned first signal transmission path and the above-mentioned secondary signal transmission path, in the time of on being arranged at above-mentioned first signal transmission path, above-mentioned match circuit is coupled to above-mentioned transmit-receive switch and above-mentioned receiving element, in the time of on being arranged at above-mentioned secondary signal transmission path, above-mentioned match circuit couples above-mentioned transmit-receive switch and above-mentioned transmitter unit, make the input impedance of above-mentioned first signal transmission path and the output impedance and the above-mentioned radio frequency front-end device of above-mentioned secondary signal transmission path reach impedance matching, wherein above-mentioned transmit-receive switch, transmitter unit, receiving element and match circuit system are arranged in the same chip.
In another embodiment of the present invention, match circuit is used so that the output impedance and the said antenna device of the input impedance of first signal transmission path and secondary signal transmission path reach impedance matching.
Description of drawings
1A figure system shows a kind of existing transmitter with single-pole double throw transmit-receive switch.
1B figure system shows a kind of existing transmitter with double-pole double-throw transmit-receive switch.
The 2nd figure shows the another kind of transmitter of enjoying 200.
3A figure is first embodiment of transmitter of the present invention.
3B figure is second embodiment of transmitter of the present invention.
3C figure is the 3rd embodiment of transmitter of the present invention.
Label declaration
Prior art:
100,100 ', 200: transmitter;
10,10 ', 20: printed circuit board (PCB);
ANT, ANT1, ANT2: antenna;
12a～12d: external matching circuit;
14,14 ': transmit-receive switch;
16,16 ': chip;
162: receiving element;
163: low noise amplifier;
164: transmitter unit;
165: mixer;
167: power amplifier.
The present invention:
300A, 300B, 300C: transmitter;
ANT, ANT1, ANT2: antenna;
32,38: external matching circuit;
30: printed circuit board (PCB);
34a, 34b: transmit-receive switch;
36: chip;
362: receiving element;
363: low noise amplifier;
364: transmitter unit;
365: mixer;
367: power amplifier;
PATH1: first signal transmission path;
PATH2: secondary signal transmission path;
Z
ANT, Z
PATH1, Z
PATH2, Z
RXIN1, Z
RXIN2, Z
TXOUT1, Z
TXOUT2, Z
TXOUT, Z
RXIN, Z
ANT1, Z
ANT2: impedance.
Embodiment
For above and other objects of the present invention, feature and advantage can be become apparent, a preferred embodiment cited below particularly, and cooperate appended diagram, be described in detail below:
First embodiment
3A figure is first embodiment of transmitter front end framework of the present invention.Transmitter 300A system is arranged on the printed circuit board (PCB) 30, comprises antenna assembly 31 and transmission chip 36, and transmission chip 36 is to comprise transmit-receive switch 34a, inner match circuit 35, receiving element 362 and transmitter unit 364 at least.Antenna assembly 31 is to can be considered radio frequency front-end device, and comprises antenna ANT and external matching circuit 32.Receiving element 362 comprises a low noise amplifier 363 (low noise amplifier at least; LNA) and a mixer 364 (mixer), in order to by antenna assembly 31 received RF signals.For instance, low noise amplifier 363 is in order to the amplification received signal, and mixer 364 then changes into intermediate-freuqncy signal or fundamental frequency signal with signal.Transmitter unit 364 comprises power amplifier a 363 (power amplifier at least; PA), in order to transmit radiofrequency signal by antenna assembly 31.
Transmit-receive switch 34a is a single-pole double throw (single pole dual throw; SPDT) transmit-receive switch (transmit/receive switch; T/R switch), and by a pin 37 that transmits chip 36 be coupled to antenna assembly 31.Transmit-receive switch 34a is optionally conducting first signal transmission path (RX path) PATH1 and secondary signal transmission path (transmission path) PATH2.Transmit-receive switch 34a system is will launch or received signal according to transmitter, and the conducting first signal transmission path PATH1 to be connecting antenna assembly 31 and receiving element 362, or conducting secondary signal transmission path PATH2 is to couple antenna assembly 31 and transmitter unit 364.
First external matching circuit 32 is the impedance matching (impedance matching) that is used for reaching between antenna assembly 31 and the transmit-receive switch 34a, because RX path PATH1 and transmission path PATH2 share first external matching circuit 32, so connect at transmit-receive switch 34a on the pin 37 of first external matching circuit 32, the impedance of being seen must be approaching in RX path and transmission path, that is to say the impedance Z of first signal transmission path
PATH1Need impedance Z near transmit-receive switch secondary signal path
PATH2, Z just
PATH1≈ Z
PATH2
When transmit-receive switch 34a itself is the design of a two-way symmetry, just when the insertion loss of the insertion loss (insertion loss) of first transmission path and the impedance and second transmission path and impedance equate, then only need consider the impedance Z of receiving terminal
RXIN2And the impedance Z of transmitting terminal
TXOUT, make Z
RXIN2Near Z
TXOUT(Z
RXIN2≈ Z
TXOUT).
When transmitting, by the selection of transmit-receive switch 34a, the output impedance Z of transmitter unit 364
TXOUTChange into the impedance Z of transmission path through transmit-receive switch 34a
PATH2, and with the output/input impedance Z of antenna assembly 31
ANTReach impedance matching, and when received signal, the input impedance of receiving element 362 system is adjusted to impedance Z by inner match circuit 35
RXINT2, become Z through transmit-receive switch 34a again
PATH1And with the output/input impedance Z of antenna assembly 31
ANTReach impedance matching, so then can share same external matching circuit, simplified the design of chip exterior circuit in received signal with when transmitting.
When transmit-receive switch 34a itself is not the design of a two-way symmetry, directly consider the Z of pin 37 ends
PATH1And Z
PATH2, the design of inner match circuit 35 is the impedance Z that makes the signal transmission path of winning at this moment
PATH1Impedance Z near transmit-receive switch secondary signal path
PATH2, just allow Z
PATH1≈ Z
PATH2, as previously mentioned, the design of first external matching circuit 32 at this moment only needs at Z
PATH1Or Z
PATH2Do impedance matching, can reach the output/input impedance Z of antenna assembly 31
ANTWhile and Z
PATH1And Z
PATH2Reach impedance matching effect.
Therefore, the RF front end structure of transmitter of the present invention, owing to only need the outer match circuit of a chip, significantly simplified the radio-frequency front-end design of whole transmitter, save the design of external matching circuit, saved the layout area of printed circuit board (PCB) 30, and a match circuit 35 of chip internal, avoid using two (transmitting and receiving) match circuits of tradition to cause too much loss of signal, also saved the area of chip internal.In addition,, transmit and receive and to share pin 37, also therefore saved the pin number of transmission chip 36 owing to integrated transmit-receive switch 34a.
Second embodiment
3B figure is one second embodiment of transmitter RF front end structure of the present invention.As shown in FIG., transmitter 300B system is similar to the transmitter 300A among the 3A figure, and except transmitter 300 has two groups of antenna assembly 31a and 31b, and transmit-receive switch 34b is a double-pole double-throw (dual pole dualthrow; SPDT) transmit-receive switch is in order to do the selection of antenna ANT1 and antenna ANT2.
First external matching circuit 32 is the impedance matching (impedance matching) that is used for reaching between antenna assembly 31a and the transmit-receive switch 34b, because RX path PATH1 and transmission path PATH2 share first external matching circuit 32, so connect at transmit-receive switch 34b on the pin 37 of first external matching circuit 32, the impedance of being seen must be approaching at RX path PATH1 and transmission path PATH2, that is to say the impedance Z of the first signal transmission path PATH1
PATH1Need impedance Z near transmit-receive switch secondary signal path P ATH2
PATH2, Z just
PATH1≈ Z
PATH2Similarly, the impedance matching between antenna assembly 31b and the transmit-receive switch 34b can also be used for reaching by second external matching circuit 38, and principle is not stated tired in this as hereinbefore.
As transmit-receive switch 34b itself is the design of a two-way symmetry, just in insertion loss (insertion loss) and the impedance of the first transmission path PATH1, when equating, then only need consider the impedance Z of receiving terminal with the insertion loss of the second transmission path PATH2 and impedance
RXIN2And the impedance Z of transmitting terminal
TXOUT, make Z
RXIN2Near Z
TXOUT(Z
RXIN2≈ Z
TXOUT).
When transmitting, by the selection of transmit-receive switch 34b, the output impedance Z of transmitter unit 364
TXOUTChange into the impedance Z of transmission path PATH2 through transmit-receive switch 34b
PATH2, and with the I/O impedance Z of antenna assembly 31a
ANTReach impedance matching, and when received signal, the output impedance of receiving element 362 system is adjusted to impedance Z by inner match circuit 35
RXINT2, become Z through receiving key 34b again
PATH1, and with the I/O impedance Z of antenna assembly 31a
ANT1Reach impedance matching, so then in received signal when transmitting, can share same external matching circuit, simplified the design of external circuit.
When transmit-receive switch 34b itself is not the design of two-way symmetry, directly consider the impedance Z of pin 37
PATH1And Z
PATH2, this moment inner match circuit 35 design, be to make the impedance Z of the first signal transmission path PTAH1 among the transmit-receive switch 34b
PATH1Level off to the impedance Z of secondary signal transmission path PTAH2
PATH2, Z just
PATH1≈ Z
PATH2, as previously mentioned, the design of first external matching circuit 32 at this moment only need be at impedance Z
PATH1Or Z
PATH2Do impedance matching, can reach the I/O impedance Z of antenna assembly 31a
ANT1While and impedance Z
PATH1Or Z
PATH2Reach impedance matching effect.Similarly, by the design of second external matching circuit 38, at impedance Z
PATH1Or Z
PATH2Do impedance matching, also can reach the I/O impedance Z of antenna assembly 31b
ANT2While and impedance Z
PATH1Or Z
PATH2Reach impedance matching effect.Therefore, when transmitting, can share same external matching circuit 32 or 38, simplify the design of external circuit in received signal.
The 3rd embodiment
3C figure is one the 3rd embodiment of transmitter RF front end structure of the present invention.As shown in 3C figure, transmitter 300C system is similar to the transmitter 300A among the 3A figure, except inner match circuit 35 is to be arranged on the secondary signal transmission path PATH2, in order to couple transmit-receive switch 34a and transmitter unit 364.
First external matching circuit 32 is the impedance matching (impedance matching) that is used for reaching between antenna assembly 31 and the transmit-receive switch 34a, because RX path PATH1 and transmission path PATH2 share first external matching circuit 32, so connect at transmit-receive switch 34a on the pin 37 of first external matching circuit 32, the impedance of being seen must be approaching in RX path and transmission path, that is to say the impedance Z of first signal transmission path
PATH1Need impedance Z near transmit-receive switch secondary signal path
PATH2, Z just
PATH1≈ Z
PATH2
When transmit-receive switch 34a itself is the design of a two-way symmetry, just when the insertion loss of the insertion loss (insertion loss) of first transmission path and the impedance and second transmission path and impedance equate, then only need consider the impedance Z of receiving terminal
RXINAnd the impedance Z of transmitting terminal
TXOUT2, make Z
RXINNear Z
TXOUT2(Z
RXIN≈ Z
TXOUT2).
When received signal, by the selection of transmit-receive switch 34a, the input impedance Z of receiving element 362
TXINChange into the impedance Z of RX path through transmit-receive switch 34a
PATH1, and with the output/input impedance Z of antenna assembly 31
ANTReach impedance matching, and when transmitting, the output impedance of transmitter unit 364 system is adjusted to impedance Z by inner match circuit 35
TXOUT2, become Z through transmit-receive switch 34a again
PATH2And with the output/input impedance Z of antenna assembly 31
ANTReach impedance matching, so then can share same external matching circuit, simplified the design of chip exterior circuit in received signal with when transmitting.
When transmit-receive switch 34a itself is not the design of a two-way symmetry, directly consider the Z of pin 37
PATH1And Z
PATH2, the design of inner match circuit 35 is the impedance Z that makes the signal transmission path of winning at this moment
PATH1Impedance Z near transmit-receive switch secondary signal path
PATH2, just allow Z
PATH1≈ Z
PATH2, as previously mentioned, the design of first external matching circuit 32 at this moment only needs at Z
PATH1Or Z
PATH2Do impedance matching, can reach the output/input impedance Z of antenna assembly 31
ANTWhile and Z
PATH1And Z
PATH2Reach impedance matching effect.
Therefore, the RF front end structure of transmitter of the present invention, owing to only need the outer match circuit of a chip, significantly simplified the radio-frequency front-end design of whole transmitter, saved the layout area of printed circuit board (PCB) 30, and a match circuit 35 of chip internal, avoided using two (transmitting and receiving) match circuits of tradition to cause too much loss of signal, also saved the area of chip internal.In addition,, transmit and receive and to share pin 37, also therefore saved the pin number of transmission chip 36 owing to integrated transmit-receive switch 34a.
The present invention has used the transmission chip of integrating transmit-receive switch, choosing of match circuit, then simultaneously all uses the framework of match circuit different with traditional emission with reception.It should be noted that owing to the inside match circuit that is integrated in the chip, can have lower Q value compared to the external matching circuit that is arranged on the printed circuit board (PCB).The Q value that this is lower might reduce the usefulness of transmitter, but receiving element is hereto than noise figure (noise figure that low reactance-resistance ratio caused; NF) be the comparison acceptable with the degeneration of gain on (gain).Therefore, in transmitter of the present invention, inner match circuit preferably is arranged between the transmit-receive switch and receiving element in the chip, allow external matching circuit directly and the output impedance of transmitter unit carry out impedance matching.
Though the present invention discloses as above with preferred embodiment; right its is not in order to qualification the present invention, any those skilled in the art, without departing from the spirit and scope of the present invention; when can doing a little change and retouching, so protection scope of the present invention is as the criterion when looking appended the claim person of defining.
Claims (24)
1. a RF front end structure is applied to transmitter, comprising:
Radio frequency front-end device;
Transmit-receive switch, optionally conducting first signal transmission path and secondary signal transmission path,
Transmitter unit;
Receiving element; And
Match circuit, optionally be arranged on above-mentioned first signal transmission path and the above-mentioned secondary signal transmission path, in the time of on being arranged at above-mentioned first signal transmission path, above-mentioned match circuit is coupled to above-mentioned transmit-receive switch and above-mentioned receiving element, in the time of on being arranged at above-mentioned secondary signal transmission path, above-mentioned match circuit couples above-mentioned transmit-receive switch and above-mentioned transmitter unit, make above-mentioned receiving element and above-mentioned transmitter unit and above-mentioned radio frequency front-end device reach impedance matching, wherein above-mentioned transmit-receive switch, transmitter unit, receiving element and match circuit system are arranged in the same chip.
2. RF front end structure according to claim 1, wherein above-mentioned transmit-receive switch is the pin by said chip, is coupled to above-mentioned radio frequency front-end device.
3. RF front end structure according to claim 2, wherein above-mentioned radio frequency front-end device are to be provided with on the printed circuit board (PCB).
4. RF front end structure according to claim 2, wherein when above-mentioned match circuit was arranged on the above-mentioned secondary signal transmission path, the input impedance of above-mentioned receiving element system reached impedance matching by above-mentioned match circuit with the output/input impedance of above-mentioned radio frequency front-end device.
5. RF front end structure according to claim 4, wherein the output impedance of above-mentioned transmitter unit system matches each other with the output/input impedance of above-mentioned radio frequency front-end device.
6. RF front end structure according to claim 2, wherein when above-mentioned match circuit system was arranged on above-mentioned first signal transmission path, the output impedance system of above-mentioned transmitter unit reached impedance matching by above-mentioned match circuit with the output/input impedance of above-mentioned radio frequency front-end device.
7. RF front end structure according to claim 6, wherein the input impedance of above-mentioned receiving element system matches each other with the output/output impedance of above-mentioned radio frequency front-end device.
8. RF front end structure according to claim 2, wherein above-mentioned radio frequency front-end device are to comprise antenna and external matching circuit, and the said external match circuit is coupled to the pin of above-mentioned antenna and said chip.
9. RF front end structure according to claim 1, wherein above-mentioned transmitter unit are to comprise power amplifier.
10. RF front end structure according to claim 1, wherein above-mentioned receiving element are to comprise low noise amplifier and frequency mixer.
11. RF front end structure according to claim 1, wherein above-mentioned transmit-receive switch are the transmit-receive switch of single-pole double throw.
12. RF front end structure according to claim 1, wherein above-mentioned transmit-receive switch are the transmit-receive switch of double-pole double-throw.
13. a RF front end structure is applied to transmitter, comprising:
Transmit-receive switch, optionally conducting first signal transmission path and secondary signal transmission path;
Transmitter unit;
Receiving element;
Radio frequency front-end device; And
Match circuit, optionally be arranged on above-mentioned first signal transmission path and the above-mentioned secondary signal transmission path, in the time of on being arranged at above-mentioned first signal transmission path, above-mentioned match circuit is coupled to above-mentioned transmit-receive switch and above-mentioned receiving element, in the time of on being arranged at above-mentioned secondary signal transmission path, above-mentioned match circuit couples above-mentioned transmit-receive switch and above-mentioned transmitter unit, make the input impedance of above-mentioned first signal transmission path and the output impedance and the above-mentioned radio frequency front-end device of above-mentioned secondary signal transmission path reach impedance matching, wherein above-mentioned transmit-receive switch, transmitter unit, receiving element and match circuit system are arranged in the same chip.
14. RF front end structure according to claim 13, wherein above-mentioned transmit-receive switch is the pin by said chip, is coupled to above-mentioned radio frequency front-end device.
15. RF front end structure according to claim 13, wherein above-mentioned radio frequency front-end device are to be arranged on the printed circuit board (PCB).
16. RF front end structure according to claim 14, wherein when above-mentioned match circuit system was coupled on the above-mentioned secondary signal transmission path, the input impedance system on the above-mentioned secondary signal transmission path reached impedance matching by above-mentioned match circuit with the output/output impedance of above-mentioned radio frequency front-end device.
17. RF front end structure according to claim 16, the output impedance system on wherein above-mentioned first signal transmission path matches each other with the output/output impedance of above-mentioned radio frequency front-end device.
18. RF front end structure according to claim 14, wherein when above-mentioned match circuit system was arranged on above-mentioned first signal transmission path, the output impedance system on the above-mentioned secondary signal transmission path reached impedance matching by the I/O impedance of above-mentioned match circuit and above-mentioned radio frequency front-end device.
19. RF front end structure according to claim 18, the input impedance system on the wherein above-mentioned secondary signal transmission path matches each other with the output/input impedance of above-mentioned radio frequency front-end device.
20. RF front end structure according to claim 14, wherein above-mentioned radio frequency front-end device are to comprise that antenna assembly and external matching circuit are coupled between said antenna device and the above-mentioned link.
21. RF front end structure according to claim 13, wherein above-mentioned transmitter unit are to comprise power amplifier.
22. RF front end structure according to claim 13, wherein above-mentioned receiving element are to comprise low noise amplifier and frequency mixer.
23. RF front end structure according to claim 13, wherein above-mentioned transmit-receive switch are the transmit-receive switch of single-pole double throw.
24. RF front end structure according to claim 13, wherein above-mentioned transmit-receive switch are the transmit-receive switch of double-pole double-throw.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100817752A CN100546211C (en) | 2004-12-31 | 2004-12-31 | The radio-frequency front-end match circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100817752A CN100546211C (en) | 2004-12-31 | 2004-12-31 | The radio-frequency front-end match circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1801644A true CN1801644A (en) | 2006-07-12 |
| CN100546211C CN100546211C (en) | 2009-09-30 |
Family
ID=36811448
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004100817752A Active CN100546211C (en) | 2004-12-31 | 2004-12-31 | The radio-frequency front-end match circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100546211C (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101159441B (en) * | 2007-11-07 | 2011-01-19 | 络达科技股份有限公司 | Front end circuit structure of wireless transceiver |
| CN102170296A (en) * | 2011-04-22 | 2011-08-31 | 北京大学 | A radio frequency front-end circuit structure |
| US8238841B2 (en) | 2007-11-21 | 2012-08-07 | Airoha Technology Corp. | Wireless transceiver chip and calibration method thereof |
| CN103746680A (en) * | 2013-12-31 | 2014-04-23 | 北京朗波芯微技术有限公司 | Radio frequency switch |
| WO2019233253A1 (en) * | 2018-06-06 | 2019-12-12 | 维沃移动通信有限公司 | Radio frequency circuit, terminal and signal emission control method |
| CN112422146A (en) * | 2019-08-23 | 2021-02-26 | 瑞昱半导体股份有限公司 | Wireless transceiver |
-
2004
- 2004-12-31 CN CNB2004100817752A patent/CN100546211C/en active Active
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101159441B (en) * | 2007-11-07 | 2011-01-19 | 络达科技股份有限公司 | Front end circuit structure of wireless transceiver |
| US8022786B2 (en) | 2007-11-07 | 2011-09-20 | Airoha Technology Corp. | Front-end circuit of the wireless transceiver |
| US8238841B2 (en) | 2007-11-21 | 2012-08-07 | Airoha Technology Corp. | Wireless transceiver chip and calibration method thereof |
| CN102170296A (en) * | 2011-04-22 | 2011-08-31 | 北京大学 | A radio frequency front-end circuit structure |
| CN103746680A (en) * | 2013-12-31 | 2014-04-23 | 北京朗波芯微技术有限公司 | Radio frequency switch |
| CN103746680B (en) * | 2013-12-31 | 2017-01-25 | 北京朗波芯微技术有限公司 | Radio frequency switch |
| WO2019233253A1 (en) * | 2018-06-06 | 2019-12-12 | 维沃移动通信有限公司 | Radio frequency circuit, terminal and signal emission control method |
| CN112422146A (en) * | 2019-08-23 | 2021-02-26 | 瑞昱半导体股份有限公司 | Wireless transceiver |
Also Published As
| Publication number | Publication date |
|---|---|
| CN100546211C (en) | 2009-09-30 |
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Address after: Taiwan, Hsinchu, China Patentee after: Dafa Technology Co.,Ltd. Address before: Taiwan, Hsinchu, China Patentee before: AIROHA TECHNOLOGY CORP. |