CN102098009B - Output match circuit of radio frequency (RF) power amplifier and design method thereof - Google Patents
Output match circuit of radio frequency (RF) power amplifier and design method thereof Download PDFInfo
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Abstract
The invention discloses an output match circuit of a radio frequency (RF) power amplifier. The output match circuit is mainly formed by an unilateral feed circuit connected with an output end of an RF power amplifying tube, and the output end of the RF power amplifying tube is further connected with an LC (liquid crystal) serial-parallel resonant circuit connected with the output end of the RF power amplifying tube in parallel. The invention further discloses a design method of the output match circuit of the RF power amplifier. As the output end of the RF power amplifying tube is provided with the LC serial-parallel resonant circuit connected with the output end of the RF power amplifying tube in parallel, the signal with the frequency of f0 is not influenced, the low-frequency equivalent resonant inductance at the output end of the RF power amplifier is reduced, the video band width is widened, the memory effect is improved, and the distributing area of the output match circuit of the RF power amplifier is reduced. The design method can conveniently and fast design the output match circuit of the RF power amplifier aiming at different work frequencies.
Description
Technical field
The present invention relates to a kind of method for designing of output matching circuit of radio-frequency power amplifier.
Background technology
Along with the development of the communication technology and the raising of people's living standard, the mankind have been not content with simple voice call requirement to the requirement of radio communication, but wish on basic voice communication basis, to realize high speed, the broadband, wireless interconnected reliably, the transmission of reliable high speed broadband service is had higher requirement to communication equipment.
For the radio-frequency power amplifier of one of Wireless Telecom Equipment core bulk-breaking, realize the transmission of broadband signal and high power, high linear the amplification, the gain and linear demand in need satisfy working band, also need emphasis to consider the impedance operator of low-frequency modulation signal frequency band.Because along with the development of Digital Signal Processing and improving constantly of communication equipment energy-saving environmental requirement, modern base station power amplifier all adopts digital pre-distortion (DPD) that its linearity is compensated, and how focusing on of Designing power amplifier raises the efficiency and the available linearization aspect of power amplifier, power amplifier whether the degree of available linearization and available linearization except outside the Pass the algorithm with digital pre-distortion has, at power amplifier itself, largely be to be determined by the memory effect of power amplifier.In the radio communication power amplifier, memory effect is generally defined as according to being disinclined to the nonlinear effect of signal bandwidth, memory effect produces the mobile phone reason by it can be divided into electric memory effect and electric heating memory effect, because the power amplifier tube device manufacturer is being done a large amount of optimization aspect the electric heating memory effect of device, the memory effect of the power amplifier of therefore generally speaking talking about when Designing power amplifier refers generally to electric memory effect.According to power amplifier distortion theory analysis, main impedance of fundamental frequency, second harmonic impedance and the envelope impedance with power amplifier of electric memory effect big or small and inconsistent relevant in the signal bandwidth scope thereof.For communications band and signal bandwidth, because the relative bandwidth of first-harmonic and second harmonic frequency range is narrower, be easy to accomplish change in very little scope in the input and output impedance of two times of signal bandwidth scope internal power amplifiers of the signal bandwidth scope of first-harmonic and second harmonic.But consistent for accomplishing impedance (envelope impedance) in the low-frequency modulation signal frequency range, then be not easy very much.Therefore, when the design power amplifier, improve the memory effect of amplifier and mainly set about from the envelope impedance of amplifier.The variation of envelope impedance or the bandwidth of its size in tolerance interval are called video bandwidth (VBW).
By front described, accomplish that the envelope impedance is consistent, be not easy very much.Such as: if a certain power amplifier amplifying signal bandwidth is 100MHz, then its envelope frequency scope is from 0～100MHz, accomplish that frequency is consistent from the impedance in 0～100MHz, is very difficult.Addressing this problem can be from two aspects: 1, resonance point do not occur in the envelope impedance ranges, because resonance can cause impedance sharply to change; 2, make the envelope impedance as far as possible little, can reduce like this amplitude of envelope signal, thereby reduce envelope signal to the impact of third order intermodulation distorted signal.The method of traditional processing envelope impedance is at the electric capacity of the different appearance values of power amplifier tube supply lines adding so that the envelope impedance is consistent as far as possible, or use bilateral feed line, thereby make the as far as possible little or resonance point of envelope impedance outside the envelope impedance ranges with the equivalent inductance that reduces output matching circuit.This method has been owing to introduced bilateral feed line, causes that the cloth space of a whole page is long-pending to be increased, and this is for being unallowed to the more and more less communication system of volume requirement.
Summary of the invention
The object of the invention is to overcome the long-pending large shortcoming and defect of the cloth space of a whole page that above-mentioned prior art exists, a kind of output matching circuit of radio-frequency power amplifier is provided.
Another object of the present invention also is to provide a kind of implementation method of output matching circuit of above-mentioned radio-frequency power amplifier.
Purpose of the present invention is achieved through the following technical solutions: a kind of output matching circuit of radio-frequency power amplifier, mainly be made of the monolateral feed circuit that is connected to radio-frequency power amplifier tube output, described radio-frequency power amplifier tube output also is connected with a LC series parallel resonance circuit in parallel with it.
The LC series circuit that above-mentioned LC series parallel resonance main circuit will be comprised of inductance L 3 and capacitor C 1 and the capacitor C 2 in parallel with this LC series circuit consist of, and described LC series circuit is connected between radio-frequency power amplifier tube output and the ground wire; Described capacitor C 1 is short-circuit condition for the envelope frequency signal, and capacitor C 2 is open-circuit condition for the envelope frequency signal.
Above-mentioned monolateral feed circuit mainly by be connected to the supply lines between radio-frequency power amplifier tube output and the power supply and be connected to supply lines and ground wire between radio frequency electric capacity C3 and ceramic condenser C4 consist of; Described radio frequency electric capacity C3 is open-circuit condition for the envelope frequency signal; Ceramic condenser C4 is short-circuit condition for the envelope frequency signal.
A kind of method for designing of output matching circuit of above-mentioned radio-frequency power amplifier may further comprise the steps:
(a) according to the wide degree of the packaging belt of radio-frequency power amplifier amplifying signal, determine the video bandwidth f that radio-frequency power amplifier needs
Bw
(b) according to video bandwidth f
Bw, determine the low-frequency resonant frequency f of output matching circuit
r
(c) according to the low-frequency resonant frequency f
r, calculate the size of inductance L 3, capacitor C 1 and capacitor C 2 in the LC series parallel resonance circuit;
(d) according to the size of inductance L 3, capacitor C 1 and capacitor C 2, carry out device and choose, and connect and compose the output matching circuit of above-mentioned radio-frequency power amplifier with monolateral feed circuit.
As a further improvement on the present invention, in the described step (b), the low-frequency resonant frequency of output matching circuit is greater than 1.5～2 times of video bandwidths.
Further improve as of the present invention, after described step (c) finishes, the inductance L 3, capacitor C 1 and the capacitor C 2 that calculate are carried out emulation together with whole output matching circuit substitution simulation software, be not inconsistent such as the radio-frequency (RF) index of radio-frequency power amplifier or video bandwidth and theoretical calculating, then finely tune, finally determine the size of inductance L 3, capacitor C 1 and capacitor C 2.
In sum, the invention has the beneficial effects as follows:
(1) the present invention is by arranging a LC series parallel resonance circuit in parallel with it at radio-frequency power amplifier tube output, and this LC series parallel resonance circuit resonance is in radio-frequency power amplifier operating frequency f
0Near, utilize it to be f for frequency
0Signal present open-circuit condition, present short-circuit condition for the envelope frequency signal, thereby realized being f to frequency
0Signal reduce the low frequency equivalence resonant inductance of radio-frequency power amplifier output without impact time, and then broadening video bandwidth and improved memory effect; Because the LC device is the lumped parameter device, thereby it is long-pending not need to increase the cloth space of a whole page, and the cloth space of a whole page that has effectively reduced the radio-frequency power amplifier output matching circuit is long-pending;
(2) the invention also discloses a kind of method for designing of output matching circuit of above-mentioned radio-frequency power amplifier, by this method for designing, can conveniently design the radio-frequency power amplifier output matching circuit for the different operating frequency, thereby at the broadening video bandwidth with when improving memory effect, the cloth space of a whole page that has effectively reduced the radio-frequency power amplifier output matching circuit is long-pending.
Description of drawings
Fig. 1 is the output matching circuit schematic diagram of radio-frequency power amplifier disclosed by the invention;
Fig. 2 is the output matching circuit schematic diagram of traditional radio-frequency power amplifier.
Embodiment
Below in conjunction with embodiment and accompanying drawing, the present invention is described in further detail, but embodiments of the present invention are not limited only to this.
Embodiment:
The output matching circuit of a kind of radio-frequency power amplifier as shown in Figure 1 mainly is made of the monolateral feed circuit that is connected to radio-frequency power amplifier tube output, and described radio-frequency power amplifier tube output also is connected with a LC series parallel resonance circuit in parallel with it.
The LC series circuit that above-mentioned LC series parallel resonance main circuit will be comprised of inductance L 3 and capacitor C 1 and the capacitor C 2 in parallel with this LC series circuit consist of, and described LC series circuit is connected between radio-frequency power amplifier tube output and the ground wire; Described capacitor C 1 is short-circuit condition for the envelope frequency signal, and capacitor C 2 is open-circuit condition for the envelope frequency signal.
Above-mentioned monolateral feed circuit mainly by be connected to the supply lines between radio-frequency power amplifier tube output and the power supply and be connected to supply lines and ground wire between radio frequency electric capacity C3 and ceramic condenser C4 consist of; Described radio frequency electric capacity C3 is open-circuit condition for the envelope frequency signal; Ceramic condenser C4 is short-circuit condition for the envelope frequency signal.
Radio-frequency power amplifier tube in the present embodiment adopts radio-frequency power amplifier spare LDMOS(Laterally Diffused Metal Oxide Semiconductor), but be not limited to this, also can select separately according to actual conditions; C1 need choose the ceramic condenser that equivalent series resistance is less, capacity is larger, and its appearance value does not generally wait from 1uF ~ 10uF.
Now respectively for disclosed by the invention and traditional radio-frequency power amplifier output matching circuit, elaborate beneficial effect of the present invention.
Fig. 2 is traditional radio-frequency power amplifier output matching circuit that adopts in order to improve video bandwidth and memory effect, has ignored the lead-in inductance of radio-frequency power amplifier spare LDMOS among Fig. 2, C
DsEquivalent capacity for the LDMOS drain electrode; C3 and C6 are radio frequency electric capacity (because its capacity is less, for convenience of calculation, it being ignored); C4 and C5 are the larger ceramic condenser of capacity, and for the envelope frequency signal, its capacitive reactance is very little, can be approximated to be short circuit (processing by short circuit when calculating); L1 and L2 are the equivalent inductances of supply lines.
Therefore, when not adopting two-side feeding that video bandwidth and memory effect are processed, only by L1 or L2 single side feeding, this moment, the low-frequency resonant frequency of output matching circuit was:
In the formula, C is radio-frequency power amplifier spare LDMOS and drain electrode equivalent capacity C
DsValue in parallel with output matching circuit; L1 is the equivalent inductance of supply lines.
After adopting bilateral feed line, the low-frequency resonant frequency of output matching circuit is:
In the formula, C is radio-frequency power amplifier spare LDMOS and drain electrode equivalent capacity C
DsValue in parallel with output matching circuit; L1 and L2 are the equivalent inductance of supply lines.
As seen from the above, under equal conditions, after adopting bilateral feed line, the resonance frequency of radio-frequency power amplifier output matching circuit has improved 1.4 times, be that impedance variation large point is to the high-end translation of frequency, thereby the video bandwidth of radio-frequency power amplifier is improved, and memory effect is improved.But since the extra adding of this mode a feed line, and the length of this feed line can not be any, be 1/4 of service frequency signal wavelength generally speaking, therefore increased the more cloth space of a whole page and amassed.
As shown in Figure 1, the present invention has replaced to the LC series parallel resonance circuit that is comprised of L3, C1 and C2 with the wherein one side feed line among Fig. 2, and wherein, C1 is the larger electric capacity of capacity, and its capacitive reactance almost is short-circuit condition for the envelope frequency signal; Capacitor C 2 is open-circuit condition for the envelope frequency signal; L2 is the equivalent inductance of supply lines, therefore, requires this resonant circuit to satisfy:
Parallel resonance frequency:
In the formula,
Centre frequency for the power amplifier operating frequency; The inductance value of L3 is less than or equal to the equivalent inductance L1 of monolateral feed line among Fig. 2, generally speaking, and less than 5nH;
For the envelope frequency signal, because the appearance value of C2 is less, it is open-circuit condition for the envelope frequency signal, and this moment, the low-frequency resonant frequency of output matching circuit was:
In the formula,
Be radio-frequency power amplifier spare LDMOS and drain electrode equivalent capacity C
DsValue in parallel with output matching circuit; L2 is the equivalent inductance of supply lines.
Because the inductance value of L3 is less than or equal to the equivalent inductance value of L1, therefore, the low-frequency resonant frequency of this invention is more than or equal to the low-frequency resonant frequency of traditional bilateral feed line device; Because the LC connection in series-parallel is wiped the circuit that shakes and for frequency is
The working frequency range signal, be equivalent to open-circuit condition, namely can not exert an influence with amplification to the transmission of useful signal, but can reach even be better than the effect that traditional method of improving video bandwidth reaches, and L3, C1 and C2 are the lumped parameter original paper, therefore, it takies the area of the long-pending distributed constant original paper much smaller than bilateral feed line of the cloth space of a whole page.
The present invention is directed to different operating frequencies, choose different L3, C1 and C2, to satisfy above-mentioned requirements.
The invention also discloses a kind of method for designing of above-mentioned radio-frequency power amplifier output matching circuit, may further comprise the steps:
(a) according to the wide degree of the packaging belt of radio-frequency power amplifier amplifying signal, determine the video bandwidth f that radio-frequency power amplifier needs
Bw, as: when the envelope signal bandwidth is 20MHz, the video bandwidth of radio-frequency power amplifier should be to little of 20MHz, if consider the impact of 2 subharmonic distorted signals, then video bandwidth should be greater than 40MHz, etc.; Different application scenarioss and the different DPD system that cooperates from power amplifier, the video bandwidth that needs is different, and video bandwidth is greater than the DPD system to the processing bandwidth of signal generally speaking;
(b) according to video bandwidth f
Bw, determine the low-frequency resonant frequency f of output matching circuit
rIn order to make the envelope impedance change as far as possible little with different frequency and absolute value is as far as possible little, the low-frequency resonant frequency of output matching when choosing more preferably greater than 1.5～2 times of video bandwidths;
(c) according to the low-frequency resonant frequency f
r, calculating the size of inductance L 3, capacitor C 1 and capacitor C 2 in the LC series parallel resonance circuit, its detailed process is as follows:
(c1) according to databook or the device model of radio-frequency power amplifier tube, obtain the drain electrode equivalent capacity C of LDMOS device
Ds, and calculate its equivalent capacity C by design match circuit device
m
(c2) calculate the drain electrode equivalent inductance L of LDMOS device;
In the formula,
(c3) calculate inductance L 3;
In the formula, L1 is the equivalent inductance of supply lines, and L is the drain electrode equivalent inductance of LDMOS device;
(c4) choose capacitor C 1: capacitor C 1 need be chosen the ceramic condenser that ESR is less, capacity is larger.The ceramic condenser that its equivalent series resistance is less, capacity is larger, its appearance value does not generally wait from 1uF ~ 10uF;
(c5) calculate the value of capacitor C 2;
。
(d) for so that the result is more accurate, after described step (c) finishes, the inductance L 3, capacitor C 1 and the capacitor C 2 that calculate are carried out emulation together with whole output matching circuit substitution simulation software, be not inconsistent such as the radio-frequency (RF) index of radio-frequency power amplifier or video bandwidth and theoretical calculating, then finely tune, finally determine the size of inductance L 3, capacitor C 1 and capacitor C 2;
(e) according to the size of inductance L 3, capacitor C 1 and capacitor C 2, carry out device and choose, and connect and compose the output matching circuit of radio-frequency power amplifier as shown in Figure 1 with monolateral feed circuit.
As mentioned above, just can realize preferably the present invention.
Claims (3)
1. the method for designing of the output matching circuit of a radio-frequency power amplifier is characterized in that, may further comprise the steps:
(a) according to the wide degree of the packaging belt of radio-frequency power amplifier amplifying signal, determine the video bandwidth f that radio-frequency power amplifier needs
Bw
(b) according to video bandwidth f
Bw, determine the low-frequency resonant frequency f of output matching circuit
r
(c) according to the low-frequency resonant frequency f
r, calculate the size of inductance L 3, capacitor C 1 and capacitor C 2 in the LC series parallel resonance circuit;
(d) according to the size of inductance L 3, capacitor C 1 and capacitor C 2, carry out device and choose, and connect and compose the output matching circuit of radio-frequency power amplifier with monolateral feed circuit;
The output matching circuit of described radio-frequency power amplifier mainly is made of the monolateral feed circuit that is connected to radio-frequency power amplifier tube output, and described radio-frequency power amplifier tube output also is connected with a LC series parallel resonance circuit in parallel with it; The LC series circuit that described LC series parallel resonance main circuit will be comprised of inductance L 3 and capacitor C 1 and the capacitor C 2 in parallel with this LC series circuit consist of, and described LC series circuit is connected between radio-frequency power amplifier tube output and the ground wire; Described capacitor C 1 is short-circuit condition for the envelope frequency signal, and capacitor C 2 is open-circuit condition for the envelope frequency signal.
2. the method for designing of the output matching circuit of a kind of radio-frequency power amplifier according to claim 1 is characterized in that, in the described step (b), the low-frequency resonant frequency of output matching circuit is greater than 1.5～2 times of video bandwidths.
3. the method for designing of the output matching circuit of a kind of radio-frequency power amplifier according to claim 1 and 2, it is characterized in that, after described step (c) finishes, the inductance L 3, capacitor C 1 and the capacitor C 2 that calculate are carried out emulation together with whole output matching circuit substitution simulation software, be not inconsistent such as the radio-frequency (RF) index of radio-frequency power amplifier or video bandwidth and theoretical calculating, then finely tune, finally determine the size of inductance L 3, capacitor C 1 and capacitor C 2.
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| CN103269208B (en) * | 2013-04-18 | 2016-01-20 | 厦门市雷迅科电子科技有限公司 | A kind of radio frequency integrated circuit device of low cost high integration |
| CN105790719A (en) * | 2014-12-25 | 2016-07-20 | 中兴通讯股份有限公司 | Method and apparatus for promoting DPD (Digital Pre-Distortion) performance of radio frequency power amplifier |
| CN105631109B (en) * | 2015-12-24 | 2019-07-30 | 合肥师范学院 | A kind of design method of radio frequency ultra wide band high efficiency power amplifier |
| CN109241578B (en) * | 2018-08-14 | 2023-04-07 | 上海东软载波微电子有限公司 | Low-pass filter design method and device |
| CN109257021A (en) * | 2018-10-30 | 2019-01-22 | 天津津航计算技术研究所 | A kind of circuit and method for improving data-link communication QPSK and modulating lower radio-frequency front-end memory effect |
| CN111985177B (en) * | 2020-06-30 | 2023-05-02 | 宁波大学 | Design method of radio frequency power amplifier |
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| JPH0732335B2 (en) * | 1990-11-16 | 1995-04-10 | 日本電信電話株式会社 | High frequency amplifier |
| JP4671622B2 (en) * | 2004-04-30 | 2011-04-20 | ソニー・エリクソン・モバイルコミュニケーションズ株式会社 | Distortion compensation power amplifier |
| CN101478288A (en) * | 2008-11-24 | 2009-07-08 | 锐迪科微电子（上海）有限公司 | Method for enhancing efficiency of radio frequency power amplifier and radio frequency power amplifier circuit |
| 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 |
| CN101699767B (en) * | 2009-10-21 | 2011-09-14 | 上海华为技术有限公司 | Feed circuit of radio frequency power amplifier |
| CN201898484U (en) * | 2010-12-20 | 2011-07-13 | 芯通科技（成都）有限公司 | Output matching circuit of radio-frequency power amplifier |
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