CN202075340U - Power detector for radio-frequency power amplifier - Google Patents
Power detector for radio-frequency power amplifier Download PDFInfo
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- CN202075340U CN202075340U CN2011200527859U CN201120052785U CN202075340U CN 202075340 U CN202075340 U CN 202075340U CN 2011200527859 U CN2011200527859 U CN 2011200527859U CN 201120052785 U CN201120052785 U CN 201120052785U CN 202075340 U CN202075340 U CN 202075340U
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- power amplifier
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Abstract
The utility model discloses a power detector for a radio-frequency power amplifier, which comprises a blocking unit, a power amplifying unit, a rectification filter unit and a load, wherein the input end of the power amplifying unit is connected with the output end of the blocking unit, the input end of the rectification filter unit is connected with the output end of the power amplifying unit, the load is connected with the output end of the rectification filter unit, simultaneously the end of the load is taken as a detecting output end, and the other end of the load is earthed. For the power detector, the power amplifying unit can enable signal power received by the input end of the of the power detector to be amplified by a pre-set multiple, so that the power of radio-frequency signals of the power detector can be improved, the limitation of starting pressure of a rectification diode is reduced, and the power detecting range is extended.
Description
Technical field
The utility model relates to the power detection techniques field, particularly relates to the radio-frequency power amplifier power detection device.
Background technology
In modern wireless communication systems, the radio-frequency power amplifier power detection device is one of necessary circuitry that realizes described wireless communication system safe and stable operation, described radio-frequency power amplifier power detection device is mainly used in the size of the emission output terminal power of accurate detection radio-frequency power amplifier, described wireless communication system can accurately be controlled, therefore, described device for detecting power of radio frequency needs bigger power detection scope, promptly needs the power detection scope of radiofrequency signal of broad and the radio frequency signal frequency scope of broad.
At present, radio-frequency power amplifier adopts HBT (Hetero junction Bipolar Transistor mostly, heterojunction transistor) technology is made, the radio-frequency power amplifier chip internal of making in HBT technology adopts the size of diode rectifier electric circuit inspection output terminal power, because the forward conduction voltage of commutation diode is 0.7V in this kind testing circuit, only when the power P IN of the radiofrequency signal of radio-frequency power amplifier 〉=10dBm, described commutation diode is opened, thereby detect voltage signal in the test side, can calculate the size of the output power of radio-frequency power amplifier by this voltage signal; When the power of radiofrequency signal was too small, described commutation diode can not be opened, and can't detect voltage signal in the test side this moment, and then can't know the size of the output power of radio-frequency power amplifier.Adopt existing power-sensing circuit power detection scope to be subjected to the restriction of the forward conduction voltage of commutation diode, make that the sensing range of power detection device is very little.
The utility model content
For solving the problems of the technologies described above, the utility model embodiment provides a kind of radio-frequency power amplifier power detection device, and to solve the little problem of existing power detection device sensing range, technical scheme is as follows:
A kind of radio-frequency power amplifier power detection device comprises:
Every straight unit;
Input end and the described power amplification unit that is connected every the output terminal of straight unit;
The rectification filtering unit that input end is connected with the output terminal of described power amplification unit;
The load that is connected with the output terminal of described rectification filtering unit should the end conduct detect output terminal, the other end earth terminal of described load simultaneously.
Preferably, described power amplification unit comprises: triode, first current-limiting resistance, first inductance, second inductance, and first direct supply, second direct supply, wherein:
The base stage of described triode is connected with the positive ends of described first direct supply with described first current-limiting resistance by described first inductance;
The grounded emitter end of described triode;
The collector of described triode links to each other with the positive ends of described second direct supply by described second inductance, the negative polarity end earth terminal of described second direct supply.
Preferably, described power amplification unit also comprises: an end is connected with an end of described first inductance, second current-limiting resistance that the other end is connected with first direct supply.
Preferably, described is capacitance every straight unit, wherein:
One end of described capacitance is connected with described power input end, and the other end is connected with the tie point of described first inductance and described current-limiting resistance.
Preferably, described rectification filtering unit comprises: commutation diode and filter capacitor, the positive polarity end of described commutation diode is connected with the collector of described triode, and the cathodic end is connected with an end of described filter capacitor, the other end earth terminal of described filter capacitor.
Preferably, an end of described load is connected other end earth terminal with an end of the unearthed end of described filter capacitor.
The technical scheme that is provided by above the utility model embodiment as seen, described radio-frequency power amplifier power detection device has been set up power amplification unit, the signal power that the input end of described power detection device can be received is amplified preset multiple, improved the watt level of described power detection device radiofrequency signal, described radiofrequency signal is after power amplification unit amplifies, again after rectification filtering unit carries out rectifying and wave-filtering, the final magnitude of voltage that detects radiofrequency signal in load is through calculating the performance number of described radiofrequency signal.Because power amplification unit can increase the power of radiofrequency signal, like this, even the radiofrequency signal that described commutation diode is opened, after amplifying, the process power amplification unit can open described commutation diode, reduced the restriction of the cut-in voltage of commutation diode, detect radiofrequency signal at output terminal, increased the power detection scope.
Description of drawings
Fig. 1 is the structural representation of a kind of radio-frequency power amplifier power detection device of the utility model embodiment;
Fig. 2 is the structural representation of the another kind of radio-frequency power amplifier power detection device of the utility model embodiment.
Embodiment
In order to make those skilled in the art person understand technical scheme in the utility model better, below in conjunction with the accompanying drawing among the utility model embodiment, technical scheme among the utility model embodiment is clearly and completely described, obviously, described embodiment only is the utility model part embodiment, rather than whole embodiment.Based on the embodiment in the utility model, those of ordinary skills are not making the every other embodiment that is obtained under the creative work prerequisite, all should belong to the scope of the utility model protection.
See also Fig. 1, Figure 1 shows that the structural representation of a kind of radio-frequency power amplifier power detection device of the utility model embodiment, this radio-frequency power amplifier power detection device comprises: every straight unit 100, power amplification unit 200, rectification filtering unit 300, load 400.
Concrete, described input end every straight unit 100 is connected with the output terminal of radio-frequency power amplifier, and the isolated DC signal promptly can only make the AC signal in the radio-frequency power amplifier pass through to flow into power detection devices every straight unit 100.
The output terminal of rectification filtering unit 300 is connected with an end of load 400, simultaneously, this end is as output terminal, the other end earth terminal of load 400, by detecting the voltage signal of output terminal, be the voltage signal in the load 400, again through calculating the size that just can obtain the power of described radio-frequency power amplifier output signal.
The radio-frequency power amplifier power detection device that present embodiment provides has been set up power amplification unit, the power amplification preset multiple of the radiofrequency signal that described power amplifier can be exported, described radiofrequency signal is after power amplification unit amplifies, again after rectification filtering unit carries out rectifying and wave-filtering, the final magnitude of voltage that detects radiofrequency signal in load is through calculating the performance number of described radiofrequency signal.Because power amplification unit can increase the power of radiofrequency signal, like this, even the radiofrequency signal that described commutation diode is opened, after amplifying, the process power amplification unit can open described commutation diode, detect radiofrequency signal at output terminal, reduce the restriction of the cut-in voltage of commutation diode, increased the power detection scope.
Referring to Fig. 2, the another kind of structural representation of the radio-frequency power amplifier power detection device that the utility model embodiment provides has specifically described the structure and the course of work of this power detection device.
Be specifically as follows capacitance C1 every straight unit 100 described in this power detection device, be used for the direct current of isolated power amplifier, flow in the power detection device to prevent it.
Described power amplification unit 200 is specifically as follows the triode Q1 that is operated in the amplification region, is operated in the amplification region for guaranteeing triode Q1, and this power amplification unit also comprises: the first direct supply VB, the second direct supply VCC, current-limiting resistance, first inductance L 1, second inductance L 2, wherein:
The base stage of triode Q1 is connected with the positive ends of current-limiting resistance with the described first direct supply VB by first inductance L 1, the negative polarity end earth terminal of VB; The effect of first inductance L 1 is that the limitation of radio frequency AC signal flows in the first direct supply VB.The first direct supply VB is set at the base bias voltage of triode Q1, makes triode Q1 open and be operated in the amplification region.
Preferably, described current-limiting resistance comprises the first current-limiting resistance R1 and the second current-limiting resistance R2, wherein: the first current-limiting resistance R1 connects with the described first direct supply VB and first inductance L 1, the second current-limiting resistance R2, one end is connected with the end of described capacitance C1, and the other end is connected with the base stage of triode Q1.The effect of the first current-limiting resistance R1 is to provide base bias current for described triode Q1; The effect of second current-limiting resistance is to prevent described triode Q1 self-excitation.
The grounded emitter end of triode Q1; The collector of triode Q1 is connected with the positive ends of the second direct supply VCC by second inductance L 2, the negative polarity end earth terminal of the second direct supply VCC; The effect of second inductance L 2 is identical with first inductance L 1, and the limitation of radio frequency AC signal flows in the second direct supply VCC.The second direct supply VCC provides collector voltage for triode Q1, guarantees that further triode Q1 is operated in the amplification region.Described first inductance L 1 and second inductance L 2 can adopt RFC (Radio Frequency Choke, radio-frequency choke) to realize, can eliminate the coupling between AC signal and DC source and the ground.
Described rectification filtering unit 300 specifically can comprise: commutation diode D1 and filter capacitor C2, and the positive polarity end of commutation diode D1 are connected with the collector of triode Q1 as the input end of described rectification filtering unit; The cathodic end of commutation diode D1 is connected with the end of filter capacitor C2, the other end earth terminal of filter capacitor C2.
Described load 400 is specifically as follows resistance R 3, and an end of resistance R 3 is connected with the cathodic end of commutation diode D1, other end earth terminal, the i.e. output terminal of this power detection device of the unearthed end of resistance R 3 then, detect the voltage signal that obtains according to output terminal, be the voltage on the resistance R 3, thereby can calculate the size of the power of radio-frequency power amplifier output signal.
The course of work to this radio-frequency power amplifier power detection device describes below:
Described power detection device RF
INEnd is used for the radiofrequency signal of received RF power amplifier output, described radiofrequency signal is coupled to the base stage of triode Q1 by capacitance C1, under the amplification of triode Q1, radiofrequency signal after collector obtains amplifying, after this signal process commutation diode D1 rectification, through filtering capacitor C 2 filtering interference signals, finally at output terminal V
OUTDetect the magnitude of voltage of radiofrequency signal, promptly detect the voltage that radiofrequency signal produces on resistance R 3, calculate the size of the power of radiofrequency signal according to this magnitude of voltage process, wherein, when calculating the power of radiofrequency signal, need be contracted to the gain amplifier multiple of triode Q1, thereby obtain the real power size of the radiofrequency signal of power amplifier.
Radio-frequency power amplifier power detection device in the present embodiment is by the power amplification preset multiple of power amplification unit with the radiofrequency signal of described power amplifier output, like this, even the radiofrequency signal that described commutation diode is opened, after amplifying, the process power amplification unit can open described commutation diode, detect radiofrequency signal at output terminal, thereby increased the power detection scope.And the power detection device in the present embodiment can be integrated in the power amplifier chip by realizations such as triodes, inductance, electric capacity, resistance, reduced the peripheral circuit of power amplifier, saved the area of printed circuit board (PCB), reduced cost.
The above only is an embodiment of the present utility model; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the utility model principle; can also make some improvements and modifications, these improvements and modifications also should be considered as protection domain of the present utility model.
Claims (6)
1. a radio-frequency power amplifier power detection device is characterized in that, comprising:
Every straight unit;
Input end and the described power amplification unit that is connected every the output terminal of straight unit;
The rectification filtering unit that input end is connected with the output terminal of described power amplification unit;
The load that is connected with the output terminal of described rectification filtering unit should the end conduct detect output terminal, the other end earth terminal of described load simultaneously.
2. radio-frequency power amplifier power detection device according to claim 1 is characterized in that, described power amplification unit comprises: triode, first current-limiting resistance, first inductance, second inductance, and first direct supply, second direct supply, wherein:
The base stage of described triode is connected with the positive ends of described first direct supply with described first current-limiting resistance by described first inductance;
The grounded emitter end of described triode;
The collector of described triode links to each other with the positive ends of described second direct supply by described second inductance, the negative polarity end earth terminal of described second direct supply.
3. radio-frequency power amplifier power detection device according to claim 2 is characterized in that, described power amplification unit also comprises: an end is connected with an end of described first inductance, second current-limiting resistance that the other end is connected with first direct supply.
4. according to claim 2 or 3 described radio-frequency power amplifier power detection devices, it is characterized in that described is capacitance every straight unit, wherein:
One end of described capacitance is connected with described power input end, and the other end is connected with the tie point of described first inductance and described current-limiting resistance.
5. radio-frequency power amplifier power detection device according to claim 4, it is characterized in that, described rectification filtering unit comprises: commutation diode and filter capacitor, the positive polarity end of described commutation diode is connected with the collector of described triode, the cathodic end is connected with an end of described filter capacitor, the other end earth terminal of described filter capacitor.
6. radio-frequency power amplifier power detection device according to claim 5 is characterized in that, an end of described load is connected other end earth terminal with an end of the unearthed end of described filter capacitor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200527859U CN202075340U (en) | 2011-03-02 | 2011-03-02 | Power detector for radio-frequency power amplifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200527859U CN202075340U (en) | 2011-03-02 | 2011-03-02 | Power detector for radio-frequency power amplifier |
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| Publication Number | Publication Date |
|---|---|
| CN202075340U true CN202075340U (en) | 2011-12-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2011200527859U Expired - Lifetime CN202075340U (en) | 2011-03-02 | 2011-03-02 | Power detector for radio-frequency power amplifier |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102655434A (en) * | 2011-03-02 | 2012-09-05 | 苏州英诺迅科技有限公司 | Power detector of radio frequency power amplifier |
| CN104849543A (en) * | 2014-02-18 | 2015-08-19 | 中国科学院微电子研究所 | Radio frequency power detection circuit |
| CN109425782A (en) * | 2017-09-04 | 2019-03-05 | 北京泰龙电子技术有限公司 | A kind of radio-frequency power supply power amplifier detection device |
-
2011
- 2011-03-02 CN CN2011200527859U patent/CN202075340U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102655434A (en) * | 2011-03-02 | 2012-09-05 | 苏州英诺迅科技有限公司 | Power detector of radio frequency power amplifier |
| CN104849543A (en) * | 2014-02-18 | 2015-08-19 | 中国科学院微电子研究所 | Radio frequency power detection circuit |
| CN109425782A (en) * | 2017-09-04 | 2019-03-05 | 北京泰龙电子技术有限公司 | A kind of radio-frequency power supply power amplifier detection device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20111214 |