CN101377531B - Output power detecting structure with direction coupler and direction coupler - Google Patents
Output power detecting structure with direction coupler and direction coupler Download PDFInfo
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- CN101377531B CN101377531B CN200710142594XA CN200710142594A CN101377531B CN 101377531 B CN101377531 B CN 101377531B CN 200710142594X A CN200710142594X A CN 200710142594XA CN 200710142594 A CN200710142594 A CN 200710142594A CN 101377531 B CN101377531 B CN 101377531B
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Abstract
The invention relates to an output power sensing framework with a directional coupler; a directional coupler is arranged on the output end of the output power sensing framework. The directional coupler comprises a main path, a first branch path and a second branch path; and thus the output of a power amplifying unit can be penetrated through the coupling of the main path and first branch path to be totally coupled with a power sensing unit and penetrated through the coupling between the first branch path and the second branch path to enable the external noise to be coupled to ground, thereby enabling the power sensing unit to accurately sense the output power of the output power sensing framework.
Description
Technical field
The present invention is about a kind of radio frequency system, especially in regard to a kind of output power detecting structure with directional coupler.
Background technology
In radio frequency system; the power of exporting owing to power amplifier can Yin Wendu, the environment such as impedance matching of output terminal change; therefore the deviser can set up the output variation that a power detecting circuit comes the power scale amplifier usually in the module of radio frequency system; adjust the output power of power amplifier with further control radio frequency system in good time, make the running that radio frequency system can be stable.
In the at present general modular product, normally with each establishment of component at printed circuit board (PCB) (printed circuit broad, PCB) in, and utilize electric capacity or RC mode that the output power of module is coupled to power detecting circuit, make power detecting circuit utilize received back coupling signal why to come the present output power of judge module.
Yet such practice tends to because the support plate environment of the module application environment during with original design test is different, and the unmatched situation of generation impedance.And impedance does not match and will produce the multipath reflection that can't expect yet, and extraneous noise also is easy to together be coupled in the power detecting circuit with these reflection signals, make power detecting circuit produce inaccurate judged result, and then influenced the running of whole radio frequency system.
Summary of the invention
The present invention one has the output power detecting structure of directional coupler, be that a directional coupler is set on the output terminal of output power detecting structure, make the output of power amplification unit fully be coupled to a power detecting unit, and prevent the interference of external noise, and then make the power detecting unit more can detect the output power of output power detecting structure exactly.
Output power detecting structure provided by the present invention, it comprises a power amplification unit, an impedance matching circuit and a power detecting circuit.Comprise a directional coupler that is arranged at the output terminal of output power detecting structure in the impedance matching circuit.
This directional coupler comprises a predominating path, one first individual path and one second individual path.First end of predominating path is linked to the output terminal of output power detecting structure, and its second end is linked to the output terminal of power amplification unit.First end of first individual path is linked to power detecting circuit, and its second end is linked to first end of second individual path, and second end of second individual path then is linked to ground connection.
Transmitting high-frequency signals by this output power detecting structure, first end of predominating path is coupled to first end of first individual path, and first end of second individual path is coupled to the output terminal of output power detecting structure.
Therefore, power detecting circuit is able to obtain the back coupling signal that noiseless is mixed by the output terminal of output power detecting structure, with the output power of further judgement output power detecting structure.
Description of drawings
Fig. 1 is the synoptic diagram of the output power detecting structure of content of the present invention.
The primary clustering symbol description
Impedance matching circuit 20
Predominating path M1
The first individual path M2
The second individual path M3
Input end PI
Output terminal PO
Embodiment
The present invention is applicable to the modular design of radio frequency system, be particularly useful for having high-k integration passive element (the integrated passive component of (dielectric constant), IPC) or integrate passive device (integrated passive device is in technology IPD).Wherein, this specific inductive capacity of integrating passive element or integration passive device substrate is higher than the specific inductive capacity of substrates such as BT or FR4.Therefore, the present invention can be produced on the substrate of integrating passive element or integration passive device.
Please refer to shown in Figure 1ly, it is the synoptic diagram of the output power detecting structure of content of the present invention.This output power detecting structure comprises a power amplification unit (power amplifying unit) 10, one impedance matching circuit (impedance matching circuit) 20 and one power detecting circuit (powerdetection circuit) 30.
Impedance matching circuit 20 is sent to an output terminal PO effectively in order to the high-frequency signals with input end PI, and avoids redundant wavestrip (spurious) effect.Impedance matching circuit 20 comprises a directional coupler 21 (directional coupler).This directional coupler 21 is arranged at the online point of contact of an output, and comprises a predominating path (main line) M1, one first individual path (subline) M2 and one second individual path M3.
This predominating path M1 is transmission line (Transmission Line), and its first end is linked to output terminal PO, and its second end then is linked to the output terminal of power amplification unit 10 intermediate power amplifiers 12.The first individual path M2 is arranged at the parallel part with predominating path M1, and its first end is linked to power detecting circuit 30, and its second end then is linked to first end of the second individual path M3.Second end of the second individual path M3 is linked to ground connection.
When the high-frequency signals after amplifying was desired export via output terminal PO, mainly the road can be coupled in first end of the first individual path M2 through second end of M1, and first end of the second individual path M3 then can be coupled in output terminal PO.By this, output power detecting structure will utilize the coupling between the predominating path M1 and the first individual path M2, make and form a detecting loop between power amplification unit 10 and the power detecting circuit 30.
In order to prevent that any reflection from involving noise and being fed in the power detecting circuit 30 via directional coupler 21, make power detecting circuit 30 produce inaccurate detecting result, the length of the predominating path M1 and the first individual path M2 will be designed to quarter-wave multiple in the directional coupler 21.
Therefore, see through this detecting loop, the high-frequency signals that is sent to directional coupler 21 will form back coupling signal FB, and then branch to power detecting circuit 30, and can not produce the output that reflection wave influences power amplification unit 10 in directional coupler 21.This power is detectd 30 of lateral circuits and is feedback signal FB by this and judge the power of the high-frequency signals that present output terminal PO is exported, and produces corresponding controlling signal to variable gain amplifier 11, controls the adjusting that variable gain amplifier 11 is done output.
And in addition on the one hand, in high-frequency signals output, noise also can attempt to see through output terminal PO and be coupled in the output power detecting structure.Yet, can form open circuit between the output terminal PO and the first individual path M2, making output terminal PO multiple connect do not match effect and noise of face can not see through the first individual path M2 and be coupled to power detecting circuit 30, can see through the coupling between the second individual path M3 and the output terminal PO on the contrary, with coupling noise to ground connection.
Thus, Wai Bu noise power circuit for detecting then can be detected the output power of present output terminal PO accurately through the back coupling signal of the noise that do not mix.In addition, because the basal plate making process of IPC or IPD has the higher stable degree compared to basal plate making process such as BT or LTCC, and integrated design can make spurious effects less, and therefore the power detecting loop compared to general SMT formula has higher stability and reliability.
Advantage provided by the present invention is that output power detecting structure is arranged on integration passive element with higher dielectric constant or the substrate of the integrating passive device.
Another advantage provided by the present invention is, establishment of component on IPC with high dielectric constant or IPD substrate, can be improved output terminal impedance matching degree and degree of stability.
An advantage more provided by the present invention is that the noise of output terminal can couple directly to ground connection.
An advantage more provided by the present invention is that power detecting circuit can utilize the back coupling signal of non-impurity-doped noise to detect the power of output terminal.
An advantage more provided by the present invention is that the Design of length of directional coupler is 1/4th multiple.
Appended graphic reference and the explanation usefulness of only providing not is to be used for the present invention is limited.The above only is a preferable possible embodiments of the present invention, and is non-so promptly limit to claim of the present invention, so the equivalent structure that uses instructions of the present invention and diagramatic content to do such as changes, all in like manner is contained in the scope of the present invention, closes and gives Chen Ming.
Claims (11)
1. the output power detecting structure with directional coupler is characterized in that, comprises:
One input end is in order to receive a high-frequency signals;
One power amplification unit is linked to this input end, in order to amplify this high-frequency signals;
One output terminal is linked to this power amplification unit, in order to export the high-frequency signals after this amplification;
One directional coupler, be arranged at the online point of contact of an output, and this point of contact utilizes this output terminal to be linked to this power amplification unit, this directional coupler comprises a predominating path, one first individual path and one second individual path, this first individual path is parallel to this predominating path, and this second individual path vertically is linked to this first individual path; And
One power detecting circuit, be linked to this power amplification unit and this output terminal, and utilize through a back coupling signal that is provided by this direction coupling device, detect an output power of this power amplification unit, and produce the signal that is used for controlling this power amplification unit output;
Wherein, when this high-frequency signals of output, one end of this predominating path is coupled in this output terminal, the other end of this predominating path then is coupled in an end of this power amplification unit and this first individual path, the other end that is linked to this first individual path of this second individual path then is coupled in this output terminal, and the other end of this second individual path is connected to a ground connection;
By this, the coupling that this power detecting circuit is seen through this predominating path and this first individual path receives this back coupling signal, and the coupling that the received noise of this output terminal is then seen through this output terminal and this second individual path is sent to this ground connection.
2. the output power detecting structure with directional coupler as claimed in claim 1 is characterized in that: the length of described predominating path and this first individual path is quarter-wave multiple.
3. the output power detecting structure with directional coupler as claimed in claim 1, it is characterized in that: described power amplification unit comprises the power amplifier that a variable gain amplifier and that is linked to this input end is linked to this variable gain amplifier and this output terminal, and this variable gain amplifier is in order to control the output of this power amplifier according to this back coupling signal.
4. the output power detecting structure with directional coupler as claimed in claim 1 is characterized in that: described output power detecting structure is in substrate with the fabrication techniques of integrating passive element.
5. the output power detecting structure with directional coupler as claimed in claim 1 is characterized in that: described output power detecting structure is in substrate with the fabrication techniques of integrating passive device.
6. the output power detecting structure with directional coupler as claimed in claim 1 is characterized in that: described predominating path is a transmission line that is arranged in the impedance matching circuit.
7. directional coupler, it is characterized in that: be arranged in the output power detecting structure, in order to block noise and to be coupled a back coupling signal to this output power detecting structure, make this output power detecting structure be detected the output power of a power amplification unit exactly, this directional coupler comprises:
One predominating path, first end of this predominating path is linked to the output terminal in this output power detecting structure, and second end of this predominating path then is linked to this power amplification unit;
One first individual path, it is parallel to this predominating path, and first end of this first individual path is linked to this power amplification unit; And
One second individual path, first end of this second individual path vertically is linked to second end of this first individual path, and second end of this second individual path then is linked to a ground connection;
Wherein, this directional coupler is arranged at the online point of contact of an output in this output power detecting structure, and this point of contact utilizes this output terminal to be linked to this power amplification unit;
Wherein, when being coupled signal, this first end of this first individual path can be coupled in this second end of this predominating path, and this first end of this second individual path can be coupled in this output terminal by this directional coupler;
By this, the coupling that this power detecting circuit is seen through this predominating path and this first individual path receives this back coupling signal, and the coupling that the received noise of this output terminal is then seen through this output terminal and this second individual path is sent to this ground connection.
8. directional coupler as claimed in claim 7 is characterized in that: the length of described predominating path and this first individual path is quarter-wave multiple.
9. directional coupler as claimed in claim 7 is characterized in that: described directional coupler is in substrate with the fabrication techniques of integrating passive element.
10. directional coupler as claimed in claim 7 is characterized in that: described directional coupler is in substrate with the fabrication techniques of integrating passive device.
11. directional coupler as claimed in claim 7 is characterized in that: described predominating path is a transmission line, and is arranged in the impedance matching circuit of this output power detecting structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200710142594XA CN101377531B (en) | 2007-08-29 | 2007-08-29 | Output power detecting structure with direction coupler and direction coupler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200710142594XA CN101377531B (en) | 2007-08-29 | 2007-08-29 | Output power detecting structure with direction coupler and direction coupler |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101377531A CN101377531A (en) | 2009-03-04 |
| CN101377531B true CN101377531B (en) | 2011-09-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200710142594XA Expired - Fee Related CN101377531B (en) | 2007-08-29 | 2007-08-29 | Output power detecting structure with direction coupler and direction coupler |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4871971A (en) * | 1987-01-15 | 1989-10-03 | Jeerings Donald I | High impedance fault analyzer in electric power distribution networks |
| US5734575A (en) * | 1993-10-22 | 1998-03-31 | New York State Electric & Gas Corp. | Method and apparatus for detecting high-impedance faults in electrical power systems |
| CN1725026A (en) * | 2004-07-20 | 2006-01-25 | 华为技术有限公司 | Measuring and testing method for gain compression point output power of amplifier |
| CN1862265A (en) * | 2005-05-13 | 2006-11-15 | 大唐移动通信设备有限公司 | Apparatus and method for detecting linear index of power amplifier |
| CN1885047A (en) * | 2006-06-09 | 2006-12-27 | 东南大学 | Piezoresistance type microwave power sensor and microwave power sensing method thereof |
-
2007
- 2007-08-29 CN CN200710142594XA patent/CN101377531B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4871971A (en) * | 1987-01-15 | 1989-10-03 | Jeerings Donald I | High impedance fault analyzer in electric power distribution networks |
| US5734575A (en) * | 1993-10-22 | 1998-03-31 | New York State Electric & Gas Corp. | Method and apparatus for detecting high-impedance faults in electrical power systems |
| CN1725026A (en) * | 2004-07-20 | 2006-01-25 | 华为技术有限公司 | Measuring and testing method for gain compression point output power of amplifier |
| CN1862265A (en) * | 2005-05-13 | 2006-11-15 | 大唐移动通信设备有限公司 | Apparatus and method for detecting linear index of power amplifier |
| CN1885047A (en) * | 2006-06-09 | 2006-12-27 | 东南大学 | Piezoresistance type microwave power sensor and microwave power sensing method thereof |
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| Publication number | Publication date |
|---|---|
| CN101377531A (en) | 2009-03-04 |
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