CN201726361U - Filter circuit capable of improving linearity of power amplifier and power added efficiency - Google Patents
Filter circuit capable of improving linearity of power amplifier and power added efficiency Download PDFInfo
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- CN201726361U CN201726361U CN2010201767338U CN201020176733U CN201726361U CN 201726361 U CN201726361 U CN 201726361U CN 2010201767338 U CN2010201767338 U CN 2010201767338U CN 201020176733 U CN201020176733 U CN 201020176733U CN 201726361 U CN201726361 U CN 201726361U
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Abstract
The utility model discloses a filter circuit capable of improving the linearity of a power amplifier and the power added efficiency. The filter circuit is applied in a Cascode structure circuit formed by connecting and overlapping a common emitter transistor and a common base transistor in series, and a serially or parallelly connected resonance network for inhibiting secondary harmonic signals is connected between a collecting electrode of the common emitter transistor and the ground. The serially or parallelly connected resonance network is formed by connecting a secondary harmonic wave serially connected resonance network and an inductor in parallel, the parallelly connected resonance of the network is at the fundamental wave frequency, and the network ensures that basic wave signals can be transmitted to an emitting electrode of the common base transistor without influence when secondary harmonic wave signals are filtered.
Description
Technical field
The utility model relates to a kind of filter circuit that improves power amplifier linearity and power added efficiency.
Background technology
Universal day by day along with mobile phone, communication will develop to individualized direction, and the Internet user has brought the development of mobile multimedia and high-speed data service again with the speed increment of being doubled.Everything all requires the communication network of a new generation to possess wideer working band, supports multiple business more flexibly, and makes the communication terminal can be at different inter-network roamings.These demands have been facilitated arising at the historic moment of 3-G (Generation Three mobile communication system) standard, put into effect in succession as standards such as WCDMA, TD-SCDMA and CDMA2000.In order to hold more channel and transmission more data in limited spectral range, the availability of frequency spectrum of the modulation scheme of these systems is all higher, requires system to have good linearty.In addition, quarternary phase-shift keying (QPSK) (QPSK), M-ary orthogonal amplitude modulation (MQAM) and multiple linear amplitude modulation schemes day by day are in fashion, and these signals are amplitude-modulated signals of non-constant envelope.This will cause the system output signal envelope to have very big peak value/average power ratio, because the great dynamic range signal for the quality that guarantees to communicate by letter, requires communication system to have good linearty to the non-linear very sensitivity of system.
Power amplifier is one of the strongest non-linear device in the communication system, and its nonlinear distortion will produce many harmful effects to wireless communication system.The real part and the imaginary part of output signal planisphere are offset, make the eyes closed of eye pattern, cause spread spectrum and disturb the neighboring trace signal and worsen the error rate.In addition, distortion also makes the data transfer rate of system descend and the capacity of system is reduced, or makes the change of system channel frequency difference that the availability of frequency spectrum of system is descended.
Improving the simplest solution of power amplifier linearity is to make the PA working point much smaller than the saturation power point, works in linear zone, promptly high-power " rollback ".Power " rollback " can improve the linearity of PA, but makes the decrease in efficiency of system, and the power output of power amplifier is reduced.Therefore the main method of existing raising power amplifier linearity is to adopt linearization techniques such as feedforward, feedback, predistortion, but above linearization technique can increase the complexity of circuit structure, is unfavorable for the reduction of circuit manufacturing cost.
Summary of the invention
The utility model purpose is: a kind of filter circuit that improves power amplifier linearity and power added efficiency is provided, transfer to the second harmonic component of late-class circuit in the filtering power amplifier by front stage circuits, improve the linearity and the power added efficiency of power amplifier.
The technical solution of the utility model is: a kind of filter circuit that improves power amplifier linearity and power added efficiency, described filter circuit is for by the folded Cascode structure that constitutes of grounded-emitter transistor and grounded-base transistor string, from the collector electrode of described grounded-emitter transistor to the series parallel resonance network that is connected with the inhibition second harmonic signal the ground.Series parallel resonance network parallel resonance is in fundamental frequency, and this network guarantees to make in the filtering second harmonic signal fundamental signal not transfer to the emitter of grounded-base transistor with having influence.
Further, in above-mentioned filter circuit construction, described series parallel resonance network comprises from the collector electrode of grounded-emitter transistor to the second harmonic series resonance network and second inductance in parallel the ground.This network can be used for the inter-stage of multi-stage power amplifier equally, is transferred to the second harmonic component of late-class circuit in the filtering power amplifier by front stage circuits, improves the linearity and the power added efficiency of power amplifier.
Further, in above-mentioned filter circuit construction, described second harmonic series resonance network comprises that collector electrode from grounded-emitter transistor is to first inductance of connecting the ground and second electric capacity.Second harmonic series resonance network is shorted to ground with second harmonic signal, the second harmonic component that grounded-emitter transistor produced in the filtering Cascode circuit.
The utility model has the advantages that:
1.Cascode between circuit common-emitter configuration transistor collector and grounded-base transistor emitter the series parallel resonance network that connects can not influence the transmission that suppresses second harmonic signal under the situation of fundamental signal transmission, improve the power added efficiency and the linearity of power amplifier.
2.Cascode the harmonic filtration network that connects can be used for suppressing the nth harmonic signal between the circuit common-emitter configuration transistor AND gate cobasis structure transistor, concrete grammar please refer to embodiment.
3.Cascode the harmonic filtration network that connects can be used in the multi-stage power amplifier between the circuit common-emitter configuration transistor AND gate cobasis structure transistor, be used for filtering and be transferred to back grade second harmonic signal, improve the power added efficiency and the linearity of power amplifier integral body by prime.
Description of drawings
Below in conjunction with drawings and Examples the utility model is further described:
Fig. 1 is the utility model Cascode structure power amplifier embodiment schematic diagram;
Fig. 2 is connected schematic network structure by between the common-emitter configuration transistor collector of the utility model specific embodiment and grounded-base transistor emitter;
Circuit diagram when Fig. 3 is applied to improve the multi-stage power amplifier power added efficiency and the linearity for the utility model filter network.
Wherein: C1 first electric capacity; C2 second electric capacity; L1 first inductance; L2 second inductance; The Q1 grounded-emitter transistor; The Q2 grounded-base transistor.
Embodiment
Embodiment: as depicted in figs. 1 and 2, a kind of filter circuit that improves power amplifier linearity and power added efficiency, described filter circuit is for by the folded Cascode structure that constitutes of grounded-emitter transistor Q1 and grounded-base transistor Q2 string, from the collector electrode of described grounded-emitter transistor Q1 to the series parallel resonance network that is connected with the inhibition second harmonic signal the ground.
Described series parallel resonance network comprises from the collector electrode of grounded-emitter transistor Q1 to the second harmonic series resonance network and second inductance L 2 in parallel the ground.
Described second harmonic series resonance network comprises that collector electrode from grounded-emitter transistor Q1 is to first inductance L 1 of connecting the ground and second capacitor C 2.
An embodiment of the present utility model as shown in Figure 1, input signal arrives the base stage of grounded-emitter transistor Q1 by first capacitor C 1 and input matching network, the grounded emitter of grounded-emitter transistor Q1, collector electrode is connected to the emitter of grounded-base transistor Q2, after input signal is amplified by grounded-emitter transistor Q1 through behind the series parallel resonance network again by the emitter input of grounded-base transistor Q2, after grounded-base transistor Q2 amplifies, arrive the collector electrode of grounded-base transistor Q2, finally export every straight back by output matching network and the 4th capacitor C 4.
As shown in Figure 1, grounded-emitter transistor Q1 collector electrode connects the series parallel resonance network and is composed in parallel by second harmonic series resonance network and inductance L 2, and this network parallel resonance is at the fundamental frequency point.Second harmonic series resonance network is composed in series by L1 and C2, and this network series resonance is at the second harmonic frequency point.
Concerning the fundamental signal of being exported by the grounded-emitter transistor collector electrode, series parallel resonance network resonance, this network is approximately and opens circuit, and makes the unaffected emitter that is transferred to grounded-base transistor Q2 of fundamental signal, and is finally exported by the collector electrode of grounded-base transistor Q2.
For second harmonic signal, second harmonic series resonance network resonance, this network equivalent impedance is approximately zero.At this moment, for second harmonic, the series parallel resonance network equivalent is the lead that is connected to ground.This network is shorted to ground with second harmonic signal, effectively suppresses the emitter that second harmonic signal transfers to grounded-base transistor, has improved the linearity and the power added efficiency of power amplifier.
In addition, guaranteeing under the situation of series parallel resonance network resonance at fundamental signal, adjust the value of first inductance L 1, second inductance L 2 and second capacitor C 2, can make second harmonic series resonance network series resonance, thereby suppress the gain of nth harmonic signal in required nth harmonic frequency.The formula that the network of inhibition nth harmonic signal will satisfy is:
In (1) and (2) formula, fo is a fundamental frequency, and fn is the nth harmonic frequency.
As shown in Figure 3, among the embodiment between grounded-emitter transistor collector electrode and grounded-base transistor emitter institute be connected the series parallel resonance network and can be used for equally in secondary or the multi-stage power amplifier.This network can be used for secondary or the nth harmonic signal that filtering is exported by the prime power tube, suppress the output of prime power tube the power of corresponding harmonic signal,
In sum, the effective filtering of second harmonic series resonance network amplification and the output of power amplifier to second harmonic signal, improved the linearity and the power added efficiency of power amplifier.The series parallel resonance network guarantees that fundamental signal is unaffected when second harmonic signal is by effective filtering.
The utility model suppresses harmonic signal by the series-parallel network that utilizes electric capacity and inductance, under the situation that does not increase the power amplifier quiescent dissipation, has effectively improved the power added efficiency and the linearity of power amplifier.
Claims (3)
1. filter circuit that improves power amplifier linearity and power added efficiency, described filter circuit is by the folded Cascode structure that constitutes of grounded-emitter transistor (Q1) and grounded-base transistor (Q2) string, it is characterized in that: from the collector electrode of described grounded-emitter transistor (Q1) to being connected with the series parallel resonance network that suppresses second harmonic signal the ground.
2. the filter circuit of raising power amplifier linearity according to claim 1 and power added efficiency is characterized in that: described series parallel resonance network comprises from the collector electrode of grounded-emitter transistor (Q1) to second harmonic series resonance network and second inductance (L2) in parallel the ground.
3. the filter circuit of raising power amplifier linearity according to claim 2 and power added efficiency is characterized in that: described second harmonic series resonance network comprises that collector electrode from grounded-emitter transistor (Q1) is to first inductance (L1) of connecting the ground and second electric capacity (C2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201767338U CN201726361U (en) | 2010-04-30 | 2010-04-30 | Filter circuit capable of improving linearity of power amplifier and power added efficiency |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201767338U CN201726361U (en) | 2010-04-30 | 2010-04-30 | Filter circuit capable of improving linearity of power amplifier and power added efficiency |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201726361U true CN201726361U (en) | 2011-01-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010201767338U Expired - Lifetime CN201726361U (en) | 2010-04-30 | 2010-04-30 | Filter circuit capable of improving linearity of power amplifier and power added efficiency |
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| CN (1) | CN201726361U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105141278A (en) * | 2015-07-21 | 2015-12-09 | 苏州能讯高能半导体有限公司 | Amplification module formed by integration of transistor and film bulk acoustic resonators |
| CN106253873A (en) * | 2015-11-24 | 2016-12-21 | 苏州能讯高能半导体有限公司 | A kind of FBAR harmonic tuning amplification module |
| US10381988B2 (en) | 2017-09-15 | 2019-08-13 | Qualcomm Incorporated | Methods and apparatuses for ruggedizing a power amplifier against breakdown using harmonic tuning |
| CN112383282A (en) * | 2020-11-16 | 2021-02-19 | 江苏大学 | Continuous inverse F-type power amplifier optimally designed by adopting fragment discrete structure matching network |
-
2010
- 2010-04-30 CN CN2010201767338U patent/CN201726361U/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105141278A (en) * | 2015-07-21 | 2015-12-09 | 苏州能讯高能半导体有限公司 | Amplification module formed by integration of transistor and film bulk acoustic resonators |
| CN105141278B (en) * | 2015-07-21 | 2018-05-22 | 苏州能讯高能半导体有限公司 | The amplification module that a kind of transistor is integrated with thin film bulk acoustic wave resonator |
| CN106253873A (en) * | 2015-11-24 | 2016-12-21 | 苏州能讯高能半导体有限公司 | A kind of FBAR harmonic tuning amplification module |
| CN106253873B (en) * | 2015-11-24 | 2019-08-09 | 苏州能讯高能半导体有限公司 | A kind of thin film bulk acoustic wave resonator harmonic tuning amplification module |
| US10381988B2 (en) | 2017-09-15 | 2019-08-13 | Qualcomm Incorporated | Methods and apparatuses for ruggedizing a power amplifier against breakdown using harmonic tuning |
| CN112383282A (en) * | 2020-11-16 | 2021-02-19 | 江苏大学 | Continuous inverse F-type power amplifier optimally designed by adopting fragment discrete structure matching network |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: SUZHOU INNOTION TECHNOLOGY CO LTD Free format text: FORMER NAME: SUZHOU YINGNUOXUN TECHNOLOGY CO., LTD. |
|
| CP01 | Change in the name or title of a patent holder |
Address after: Linquan street Suzhou City Industrial Park, 215123 No. 399 in Jiangsu Province Patentee after: Suzhou Innotion Technology Co Ltd Address before: Linquan street Suzhou City Industrial Park, 215123 No. 399 in Jiangsu Province Patentee before: Suzhou Yingnuoxun Technology Co., Ltd. |
|
| CX01 | Expiry of patent term |
Granted publication date: 20110126 |
|
| CX01 | Expiry of patent term |