CN102570991A - Output matching circuit of radio frequency (RF) power amplifier - Google Patents
Output matching circuit of radio frequency (RF) power amplifier Download PDFInfo
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- CN102570991A CN102570991A CN201210041407XA CN201210041407A CN102570991A CN 102570991 A CN102570991 A CN 102570991A CN 201210041407X A CN201210041407X A CN 201210041407XA CN 201210041407 A CN201210041407 A CN 201210041407A CN 102570991 A CN102570991 A CN 102570991A
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Abstract
The invention discloses an output matching circuit of an RF power amplifier. The output matching circuit is used in the output end of the RF power amplifier, and at least comprises a first capacitor and a second inductor, wherein one end of the first capacitor is connected with a collector of an amplifying tube of the RF power amplifier, and the other end is grounded; and one end of the second inductor is connected with the collector of the amplifying tube, and the other end is connected with the power voltage. By adopting a low-pass structure, the output matching circuit not only can improve gains, suppress harmonics and improve standing-wave ratio, but also has low power loss, thereby improving efficiency and output capacity of the power amplifier.
Description
Technical field
The present invention relates to a kind of output matching circuit, particularly relate to a kind of output matching circuit of radio-frequency power amplifier.
Background technology
Radio-frequency power amplifier is a circuit module indispensable in the wireless communication system, and the radiofrequency signal after it mainly is responsible for modulating is amplified to the certain power value, launches through antenna again.For the radio-frequency power amplifier that is applied in the portable handheld device transmitter, need it to have small size, high efficiency and low cost, thereby radio-frequency power amplifier should have high as far as possible integrated level.In existing Design of RF Power Amplifier, consider requirement to indexs such as radio frequency power output and power gains, adopt two-stage or casacade multi-amplifier to realize radio-frequency power amplifier usually.Since be two-stage or multi-level RF power amplifier, need intervalve matching circuit, so that the output of the first order (prime) and the input of the second level (back level) are mated.Fig. 1 is the electrical block diagram of a kind of radio-frequency power amplifier in the prior art.As shown in Figure 1; Radio-frequency power amplifier comprises dual-stage amplifier Q1, Q2, input matching circuit, intervalve matching circuit and output matching circuit; Wherein, output matching circuit is used to realize the output of radio-frequency power amplifier and the coupling between the load that it mainly solves following problem:
1) improves gain.When output matching circuit and amplifier output port reached common black horse coupling, power gain was the highest;
2) harmonic wave suppresses.The nonlinear characteristic of power amplifier makes output not only comprise fundamental signal, also has each item harmonic wave simultaneously, and the harmonic amplitude size is certain proportionate relationship with the fundamental signal size.In high power amplifier, because fundamental power is bigger, so harmonic power is also bigger, particularly 2 subharmonic and 3 subharmonic, and they can not ignore the influence of system.In order to reduce harmonic power output, output matching circuit adopts low pass or the logical structure of band usually, eliminates the influence of parasitic passband.
3) improve standing-wave ratio.When power amplifier output standing-wave ratio is big, can strengthen gain fluctuation in the band, produce parasitic signal, can produce self-oscillation and burn power tube when serious.What therefore, the standing-wave ratio of output matching circuit will be tried one's best is little.
For power amplifier; Watt level, gain and the noise that is sent to output controlled in output impedance; So being circuit performance, the design of power amplifier output matching circuit reaches optimum key; But the power loss of output matching circuit is the problem of ignoring easily in the design process; Power amplifier output matching circuit of the prior art all reckons without the problem of power loss mostly, and these power losss are embodied in electric capacity, inductance and other dissipative cells of matching network, has reduced the efficient and the fan-out capability of power amplifier.
Summary of the invention
For overcoming the problem that above-mentioned prior art exists; Main purpose of the present invention is to provide a kind of output matching circuit of radio-frequency power amplifier; It is through adopting lowpass structures; Not only realized improving gain, suppress harmonic wave, improved the function of standing-wave ratio, and power loss is less, improved the efficient and the fan-out capability of power amplifier.
For reaching above-mentioned and other purpose, the present invention provides a kind of output matching circuit of radio-frequency power amplifier, is applied to the output of this radio-frequency power amplifier; Wherein, This output matching circuit comprises first electric capacity and second inductance at least, and this first electric capacity, one end is connected in the collector electrode of the amplifier tube of this radio-frequency power amplifier, other end ground connection; This second inductance, one end is connected in the collector electrode of this amplifier tube, another termination supply voltage.
Further, this second inductance is the field flow inductance.
Further, the collector electrode of the amplifier tube of this radio-frequency power amplifier also is connected to the detecting circuit of this radio-frequency power amplifier through second electric capacity.
Further, the amplifier tube of this radio-frequency power amplifier is the HBT pipe.
Compared with prior art, the output matching circuit of a kind of radio-frequency power amplifier of the present invention is formed Broadband Matching through second electric capacity, first electric capacity and second inductance, has not only realized improving gain, suppresses harmonic wave, has improved the function of standing-wave ratio; And power loss is less; Improve the efficient and the fan-out capability of power amplifier, simultaneously, formed Broadband Matching; Radio-frequency power amplifier can be worked in relative broad range, improved the performance of radio-frequency power amplifier.
Description of drawings
Fig. 1 is the electrical block diagram of the radio-frequency power amplifier of prior art;
Fig. 2 by the output matching circuit of a kind of radio-frequency power amplifier of the present invention the circuit diagram of radio-frequency power amplifier of application;
Fig. 3 by the output matching circuit of a kind of radio-frequency power amplifier of the present invention the circuit diagram of radio-frequency power amplifier preferred embodiment of application.
Embodiment
Below through specific instantiation and accompanying drawings execution mode of the present invention, those skilled in the art can understand other advantage of the present invention and effect easily by the content that this specification disclosed.The present invention also can implement or use through other different instantiation, and each item details in this specification also can be based on different viewpoints and application, carries out various modifications and change under the spirit of the present invention not deviating from.
Fig. 2 by the output matching circuit of a kind of radio-frequency power amplifier of the present invention the circuit diagram of radio-frequency power amplifier of application.As shown in Figure 2, the output matching circuit of a kind of radio-frequency power amplifier of the present invention is applied to the output of a radio-frequency power amplifier, comprises at least: first capacitor C 1 and second inductance L 2.
Wherein first capacitor C, 1 one ends are connected in the collector electrode of the amplifier tube Q1 of radio-frequency power amplifier, other end ground connection, and second inductance L, 2 one ends are connected in the collector electrode of the amplifier tube Q1 of radio-frequency power amplifier, another termination supply voltage VC2.At this, second inductance L 2 is the field flow inductance, and amplifier tube Q1 can be the HBT pipe.
Preferable; For realizing the present invention better; The collector electrode of the amplifier tube Q1 of radio-frequency power amplifier also is connected to the detecting circuit of radio-frequency power amplifier through a capacitor C 2; Second capacitor C 2, first capacitor C 1 and second inductance L 2 are formed Broadband Matching, and radio-frequency power amplifier can be worked in than wide operating range, have further improved the performance of radio-frequency power amplifier.
Fig. 3 by the output matching circuit of a kind of radio-frequency power amplifier of the present invention the circuit diagram of radio-frequency power amplifier preferred embodiment of application.Below will cooperate Fig. 3 to further specify the present invention.As shown in Figure 3, radio-frequency input signals RFin links to each other with base stage with amplifier tube Q1 through resistance R 1, and the emitting stage of Q1 passes through resistance R 2 ground connection; Collector electrode links to each other with detecting circuit through C2 (0.1pF); Simultaneously, its collector electrode also links to each other with capacitor C 1 (0.6pF) and inductance L 2, the other end ground connection of capacitor C 1; Inductance L 2 other ends link to each other with supply voltage VC2, and the radiofrequency signal after the amplification is exported radiofrequency signal RFout behind the output matching circuit of low pass.
In sum, the output matching circuit of a kind of radio-frequency power amplifier of the present invention is formed Broadband Matching through second capacitor C 2, first capacitor C 1 and second inductance L 2, has not only realized improving gain, suppresses harmonic wave, has improved the function of standing-wave ratio; And power loss is less; Improve the efficient and the fan-out capability of power amplifier, simultaneously, formed Broadband Matching; Radio-frequency power amplifier can be worked in relative broad range, improved the performance of radio-frequency power amplifier.
The foregoing description is illustrative principle of the present invention and effect thereof only, but not is used to limit the present invention.Any those skilled in the art all can be under spirit of the present invention and category, and the foregoing description is modified and changed.Therefore, rights protection scope of the present invention should be listed like claims.
Claims (4)
1. the output matching circuit of a radio-frequency power amplifier; Be applied to the output of this radio-frequency power amplifier; It is characterized in that: this output matching circuit comprises first electric capacity and second inductance at least, and this first electric capacity, one end is connected in the collector electrode of the amplifier tube of this radio-frequency power amplifier, other end ground connection; This second inductance, one end is connected in the collector electrode of this amplifier tube, another termination supply voltage.
2. the output matching circuit of radio-frequency power amplifier as claimed in claim 1, it is characterized in that: this second inductance is the field flow inductance.
3. the output matching circuit of radio-frequency power amplifier as claimed in claim 1, it is characterized in that: the collector electrode of the amplifier tube of this radio-frequency power amplifier also is connected to the detecting circuit of this radio-frequency power amplifier through second electric capacity.
4. the output matching circuit of radio-frequency power amplifier as claimed in claim 1 is characterized in that: the amplifier tube of this radio-frequency power amplifier is the HBT pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210041407XA CN102570991A (en) | 2012-02-22 | 2012-02-22 | Output matching circuit of radio frequency (RF) power amplifier |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210041407XA CN102570991A (en) | 2012-02-22 | 2012-02-22 | Output matching circuit of radio frequency (RF) power amplifier |
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| CN102570991A true CN102570991A (en) | 2012-07-11 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201210041407XA Pending CN102570991A (en) | 2012-02-22 | 2012-02-22 | Output matching circuit of radio frequency (RF) power amplifier |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103558895A (en) * | 2013-10-28 | 2014-02-05 | 中国电子科技集团公司第四十一研究所 | Variable power reference source circuit with national standard and design method |
| CN104506143A (en) * | 2014-12-25 | 2015-04-08 | 天津大学 | High-order harmonic suppression circuit for radio frequency power amplifier |
| CN105897199A (en) * | 2016-03-31 | 2016-08-24 | 西安空间无线电技术研究所 | Design method for multi-band-pass power amplifier |
| CN105915190A (en) * | 2016-05-12 | 2016-08-31 | 陕西理工学院 | Power amplifier of L band microwave transistor |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN200976202Y (en) * | 2006-11-30 | 2007-11-14 | 浙江康泰电气有限公司 | Small power remote controlled receivers |
| US7307473B2 (en) * | 2004-04-30 | 2007-12-11 | Sony Ericsson Mobile Communications Japan, Inc. | Distortion compensating and power amplifying apparatus |
| CN101674051A (en) * | 2009-09-22 | 2010-03-17 | 锐迪科微电子（上海）有限公司 | Method for improving efficiency of radio frequency power amplifier and radio frequency power amplifier circuit |
-
2012
- 2012-02-22 CN CN201210041407XA patent/CN102570991A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7307473B2 (en) * | 2004-04-30 | 2007-12-11 | Sony Ericsson Mobile Communications Japan, Inc. | Distortion compensating and power amplifying apparatus |
| CN200976202Y (en) * | 2006-11-30 | 2007-11-14 | 浙江康泰电气有限公司 | Small power remote controlled receivers |
| CN101674051A (en) * | 2009-09-22 | 2010-03-17 | 锐迪科微电子（上海）有限公司 | Method for improving efficiency of radio frequency power amplifier and radio frequency power amplifier circuit |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103558895A (en) * | 2013-10-28 | 2014-02-05 | 中国电子科技集团公司第四十一研究所 | Variable power reference source circuit with national standard and design method |
| CN104506143A (en) * | 2014-12-25 | 2015-04-08 | 天津大学 | High-order harmonic suppression circuit for radio frequency power amplifier |
| CN104506143B (en) * | 2014-12-25 | 2018-04-03 | 天津大学 | A kind of radio-frequency power amplifier limitation of high harmonics circuit |
| CN105897199A (en) * | 2016-03-31 | 2016-08-24 | 西安空间无线电技术研究所 | Design method for multi-band-pass power amplifier |
| CN105897199B (en) * | 2016-03-31 | 2018-12-21 | 西安空间无线电技术研究所 | Multi-pass band Designing power amplifier method |
| CN105915190A (en) * | 2016-05-12 | 2016-08-31 | 陕西理工学院 | Power amplifier of L band microwave transistor |
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Owner name: SHANGHAI ZHONGKE INSTITUTE FOR ADVANCED STUDY Free format text: FORMER OWNER: LIU YI Effective date: 20121129 |
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Application publication date: 20120711 |