CN104716906A - Method and circuit structure for improving efficiency of wide-band radio frequency power amplifier - Google Patents
Method and circuit structure for improving efficiency of wide-band radio frequency power amplifier Download PDFInfo
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Abstract
The invention discloses a method for improving efficiency of a wide-band radio frequency power amplifier, namely adding a harmonic source suppression network in output of the wide-band radio frequency power amplifier for improving efficiency. The invention also discloses a circuit structure for improving the efficiency of the wide-band radio frequency power amplifier. The circuit structure disclosed by the invention comprises a wide-band radio frequency power amplifier stage, a wide-band output matching network and a harmonic suppression network, wherein the wide-band output matching network is used for effectively outputting an output signal; the harmonic suppression network is used for carrying out harmonic suppression on a signal input into the wide-band output matching network, and the harmonic suppression network is formed by at least two second harmonic suppression networks which are connected between output of the wide-band radio frequency power amplifier stage and the ground in parallel. The method and the structure for improving the efficiency of the wide-band radio frequency power amplifier have the advantages that a second harmonic suppression circuit is adopted for being independent from an output matching network, a resonant frequency point can be flexibly controlled, second harmonic is effectively suppressed, efficiency and output capability of the power amplifier are improved, and wide-band matching is formed, so that the radio frequency power amplifier can operate in a wide range, and performances of the radio frequency power amplifier are improved.
Description
Technical field
The present invention relates to electronic technology field, relate to a kind of method improving circuit performance, particularly relate to a kind of method and the circuit structure that improve wide-band radio frequency power amplifier efficiency.
Background technology
Along with the development of wireless communication technology and the raising of people's living standard, people have been not content with simple voice call requirement to the requirement of hand-held mobile radio telecommunications, gradually from basic voice call demand to the multimedia service development of demand, to such an extent as to the complexity of current mobile radio communications system increases sharply, multiple mobile communication network is also deposited, 2G, 3G and 4G mobile communication network of such as extensive use now.In order to support the communication network of these different operating frequency ranges, the demand of mobile phone terminal radio frequency power amplifier etc. starts to be multiplied.Radio-frequency power amplifier chip is very important parts in the mobile terminal wireless transceiver systems such as smart mobile phone, and its performance directly has influence on the speech quality, signal emissive porwer, battery durable ability etc. of mobile phone.
As a rule, radio-frequency power amplifier is narrow-band device, needs for each band designs one independently large device of radio-frequency power.Current multi-mode, multi-band cell phone all include multiple power amplifier to support multiple frequency band, the complexity of the radio-frequency front-end greatly increased.
In short supply due to frequency spectrum resource, a lot of working band is all narrower, and adjacent.Such as between frequency range 2.3GHz ~ 2.7GHz, just there are multiple working bands of 4G LTE network.By the working band broadening of radio-frequency power amplifier being realized the power amplifier of compatible multiple frequency band.Fig. 1 shows the block diagram of existing conventional wideband power amplifer, includes broadband radio-frequency power amplifying stage and Broadband emission matching stage.Wherein power-amplifier stage realizes broadband power amplification, and Broadband emission matching network realizes the power stage in broadband.And the wide-band radio frequency power amplifier decentre frequency of this structure Frequency point far away power output that can reach and efficiency all lower, overall efficiency is not high yet.
In addition, in order to ensure that the output of radio-frequency power amplifier is not disturbed other frequency range, generally need to suppress the harmonic wave of the band signal that it is supported, the harmonic signal of a band signal may be positioned on another frequency band just in some applications, and such as the second harmonic of GSM900MHz band signal is just positioned on GSM1800MHz frequency band.Therefore, the circuit for suppressing the harmonic wave of the signal of a frequency band to design can suppress the normal signal of the another one frequency band be just in time positioned on its harmonic wave.And effective harmonics restraint contributes to the efficiency improving power amplifier.
Summary of the invention
For above deficiency of the prior art, technical problem to be solved by this invention provides a kind of method and the circuit structure that improve wide-band radio frequency power amplifier efficiency, effectively can suppress second harmonic, reduce the harmonic distortion of wide-band radio frequency power amplifier, improve the efficiency of wideband power amplifer.
In order to solve the problems of the technologies described above, embodiments provide a kind of method improving wide-band radio frequency power amplifier efficiency, comprising:
Connect broadband radio-frequency power amplifying stage at radio-frequency input signals end, radio frequency input signal amplifies;
Connect Broadband emission matching network at signal output part, the amplifying signal that broadband radio-frequency power amplifying stage exports effectively is exported;
Be connected harmonic suppression network in the output of broadband radio-frequency power amplifying stage with between ground, carry out harmonics restraint to the signal being input to Broadband emission matching network, wherein, described harmonic suppression network is connected in parallel by least two second harmonic Suppression networks and forms.
Correspondingly, the embodiment of the present invention additionally provides a kind of circuit structure improving wide-band radio frequency power amplifier efficiency, comprising:
Broadband radio-frequency power amplifying stage, realizes radio frequency input signal and amplifies;
Broadband emission matching network, the amplifying signal realized broadband radio-frequency power amplifying stage exports effectively exports;
Harmonic suppression network, carries out harmonics restraint to the signal being input to Broadband emission matching network;
The output of described broadband radio-frequency power amplifying stage is connected to the output of radio-frequency (RF) power amplifier circuit by described harmonic suppression network and Broadband emission matching network, described harmonic suppression network is connected in parallel between the output of broadband radio-frequency power amplifying stage and ground by least two second harmonic Suppression networks and forms.
Further, described second harmonic Suppression network is connected in series by an electric capacity and an inductance and forms, described second harmonic Suppression network one end is connected between described broadband radio-frequency power amplifying stage and Broadband emission matching network, other end ground connection, makes the second harmonic impedance of described width output matching network in whole working band all very low.Described each second harmonic Suppression network difference resonance is on different second harmonic frequencies point.
Particularly, described Broadband emission matching network comprises the first inductance, the first electric capacity, the second inductance, the second electric capacity and capacitance; Wherein, first inductance one end is the signal input part of Broadband emission matching network, and the other end connects the first electric capacity and the second inductance; First electric capacity one end connects the first inductance and the second inductance, other end ground connection; Second inductance one end connects the first inductance and the first electric capacity, and the other end connects the second electric capacity and capacitance; Second electric capacity one end connects the second inductance and capacitance, other end ground connection; Capacitance one end connects the second inductance and the second electric capacity, and the other end is the output of Broadband emission matching network.
Implement the embodiment of the present invention, there is following beneficial effect:
The method of the raising wide-band radio frequency power amplifier efficiency that the embodiment of the present invention provides and circuit structure, second harmonic is adopted to suppress loop independent of output matching network, resonant frequency point can be controlled flexibly, effective suppression second harmonic, improve efficiency and the fan-out capability of power amplifier, meanwhile, form Broadband Matching, radio-frequency power amplifier can be worked in relative broad range, improve the performance of radio-frequency power amplifier.
Accompanying drawing explanation
Fig. 1 is the circuit structure diagram of wide-band radio frequency power amplifier circuit of the prior art.
Fig. 2 is the structural representation of the circuit structure of the raising wide-band radio frequency power amplifier efficiency that the embodiment of the present invention provides.
Fig. 3 is the structural representation of the Broadband emission matching network of the circuit structure of the raising wide-band radio frequency power amplifier efficiency that the embodiment of the present invention provides.
Fig. 4 is the structural representation of the circuit structure of the raising wide-band radio frequency power amplifier efficiency that another embodiment of the present invention provides.
Fig. 5 is the simulation curve of insertion loss with frequency change of conventional Broadband emission matching network.
Fig. 6 adopts the insertion loss of the Broadband emission matching network after method provided by the invention with the simulation curve of frequency change.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
See Fig. 2, be the structural representation of the circuit structure of the raising wide-band radio frequency power amplifier efficiency that the invention process provides, as shown in the figure:
The circuit structure that the present invention improves wide-band radio frequency power amplifier efficiency forms primarily of three parts: broadband radio-frequency power amplifying stage 201, Broadband emission matching network 202 and harmonic suppression network 203.
In the middle of concrete enforcement, described broadband radio-frequency power amplifying stage 201 realizes radio frequency input signal to amplify, described Broadband emission matching network 202 is that the amplifying signal realized broadband radio-frequency power amplifying stage 201 exports effectively exports, described harmonic suppression network 203 carries out harmonics restraint to the signal being input to Broadband emission matching network 202, improve efficiency and the fan-out capability of power amplifier, simultaneously, form Broadband Matching, radio-frequency power amplifier can be worked in relative broad range, improve the performance of radio-frequency power amplifier.
The output of described broadband radio-frequency power amplifying stage 201 is connected to the output of radio-frequency (RF) power amplifier circuit by described harmonic suppression network 203 and Broadband emission matching network 202, described harmonic suppression network 203 is connected in parallel between the output of broadband radio-frequency power amplifying stage 201 and ground by least two second harmonic Suppression networks and forms.
Particularly, described harmonic suppression network 203 is included in described broadband radio-frequency power amplifying stage and exports the second harmonic Suppression network be connected in series by electric capacity and inductance with two that are connected between ground or n (n is greater than 2), described second harmonic Suppression network is as shown in Figure 2 204,205 ... 206, comprising electric capacity C1, inductance L 1, electric capacity C2, inductance L 2, electric capacity Cn and inductance L n.In addition, the sequencing of the electric capacity and inductance that form second harmonic Suppression network can change as required, described second harmonic Suppression network one end is connected between described broadband radio-frequency power amplifying stage and Broadband emission matching network, other end ground connection, namely wherein one end of described electric capacity or inductance connects power amplifier, one end ground connection in addition, second harmonic Suppression network makes the second harmonic impedance of described width output matching network in whole working band all very low.
Resonance is on different Frequency points respectively for described n second harmonic Suppression network, and conveniently calculate or application, resonance point can be equifrequent interval.In addition, the concrete value of n is determined as required.
the computing formula of resonance frequency is:
Wherein f is resonance frequency, and L is resonant network inductance value, and C is resonant network capacitance.
therefore in the present invention, n-th (n be greater than 0 natural number) computing formula of resonance frequency of second harmonic Suppression network is:
Wherein fn be 2 times to the resonance frequency of operating frequency point, Ln is resonant network inductance value, and Cn is resonant network capacitance.
Particularly, wherein in an execution mode, as shown in Figure 3, the structural representation of the Broadband emission matching network of the circuit structure of the raising wide-band radio frequency power amplifier efficiency provided for the embodiment of the present invention, this Broadband emission matching network includes: the first inductance 301, first electric capacity 302, second inductance 303, second electric capacity 304 and capacitance 305.Wherein, first inductance 301 one end is the signal input part of matching network, and the other end connects the first electric capacity 302 and the second inductance 303; First electric capacity 302 one end connects the first inductance 301 and the second inductance 303, other end ground connection; Second inductance 303 one end connects the first inductance 301 and the first electric capacity 302, and the other end connects the second electric capacity 304 and capacitance 305; Second electric capacity 304 one end connects the second inductance 303 and capacitance 305, other end ground connection; Capacitance 305 one end connects the second inductance 303 and the second electric capacity 304, and the other end is the output of matching network.
Fig. 4 is the structural representation of the circuit structure of the raising wide-band radio frequency power amplifier efficiency that another embodiment of the present invention provides, wherein second harmonic Suppression network quantity n value is 3, described second harmonic Suppression network as shown in Figure 4 406,407 and 408, comprising electric capacity C1, inductance L 1, electric capacity C2, inductance L 2 and electric capacity C3 and inductance L 3.If the operating frequency range of wideband power amplifer is 2.3GHz ~ 2.7GHz, so resonance frequency f1, f2 and f3 of second harmonic Suppression network can value be 4.8GHz, 5.0GHz and 5.2GHz respectively.The Broadband emission matching network of the circuit structure of the raising wide-band radio frequency power amplifier efficiency that another embodiment of the present invention provides includes: the first inductance 401, first electric capacity 402, second inductance 403, second electric capacity 404 and capacitance 405.Wherein, first inductance 401 one end is the signal input part of matching network, and the other end connects the first electric capacity 402 and the second inductance 403; First electric capacity 402 one end connects the first inductance 401 and the second inductance 403, other end ground connection; Second inductance 403 one end connects the first inductance 401 and the first electric capacity 402, and the other end connects the second electric capacity 404 and capacitance 405; Second electric capacity 404 one end connects the second inductance 403 and capacitance 405, other end ground connection; Capacitance 405 one end connects the second inductance 403 and the second electric capacity 404, and the other end is the output of matching network.
Present invention also offers a kind of method improving wide-band radio frequency power amplifier efficiency, connect broadband radio-frequency power amplifying stage 201 at radio-frequency input signals end, radio frequency input signal amplifies; Connect Broadband emission matching network 202 at signal output part, the amplifying signal that broadband radio-frequency power amplifying stage exports effectively is exported; Broadband radio-frequency power amplifying stage 201 output be connected harmonic suppression network 203 between ground, harmonics restraint is carried out to the signal being input to Broadband emission matching network 202.Wherein, described harmonic suppression network 203 is connected in parallel by least two second harmonic Suppression networks and forms.
Further, described second harmonic Suppression network is connected in series by an electric capacity and an inductance and forms, second harmonic Suppression network one end is connected between described broadband radio-frequency power amplifying stage 201 and Broadband emission matching network 202, other end ground connection, described second harmonic Suppression network is as shown in Figure 2 204,205 ... 206, comprising electric capacity C1, inductance L 1, electric capacity C2, inductance L 2, electric capacity Cn and inductance L n.Make the second harmonic impedance of described width output matching network in whole working band all very low, each second harmonic Suppression network difference resonance is on different second harmonic frequencies point.
Fig. 5 be the insertion loss of conventional Broadband emission matching network with the simulation curve of frequency change, Fig. 6 is be that the insertion loss of Broadband emission matching network after adopting method provided by the invention is with the simulation curve of frequency change.
Comparison diagram 5 and Fig. 6 known, adopt the Broadband emission matching network after method provided by the invention in the inhibition of Frequency point 4.8GHz, 5.0GHz and 5.2GHz, improve 38dB respectively, 40dB and 40dB; Overall inhibition within the scope of the second harmonic of operating frequency also improves more than 10dB.Can obtain adopting provided by the invention a kind of improve wide-band radio frequency power amplifier efficiency method and circuit structure designed by power amplifier can suppress the second harmonic of power amplifier significantly, improve efficiency and the linearity of power amplifier.
The method of the raising wide-band radio frequency power amplifier efficiency that the embodiment of the present invention provides and circuit structure, second harmonic is adopted to suppress loop independent of output matching network, resonant frequency point can be controlled flexibly, effective suppression second harmonic, improve efficiency and the fan-out capability of power amplifier, meanwhile, form Broadband Matching, radio-frequency power amplifier can be worked in relative broad range, improve the performance of radio-frequency power amplifier.
The above is the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention; can also make some improvements and modifications, these improvements and modifications are also considered as protection scope of the present invention.
Claims (6)
1. improve a method for wide-band radio frequency power amplifier efficiency, it is characterized in that, comprise the following steps:
Connect broadband radio-frequency power amplifying stage at radio-frequency input signals end, radio frequency input signal amplifies;
Connect Broadband emission matching network at signal output part, the amplifying signal that broadband radio-frequency power amplifying stage exports effectively is exported;
Be connected harmonic suppression network in the output of broadband radio-frequency power amplifying stage with between ground, harmonics restraint is carried out to the signal being input to Broadband emission matching network;
Wherein, described harmonic suppression network is connected in parallel by least two second harmonic Suppression networks and forms.
2. the method improving wide-band radio frequency power amplifier efficiency as claimed in claim 1, it is characterized in that, described second harmonic Suppression network is connected in series by an electric capacity and an inductance and forms, second harmonic Suppression network one end is connected between described broadband radio-frequency power amplifying stage and Broadband emission matching network, other end ground connection, make the second harmonic impedance of described width output matching network in whole working band all very low, each second harmonic Suppression network difference resonance is on different second harmonic frequencies point.
3. improve a circuit structure for wide-band radio frequency power amplifier efficiency, it is characterized in that, comprising:
Broadband radio-frequency power amplifying stage, realizes radio frequency input signal and amplifies;
Broadband emission matching network, the amplifying signal realized broadband radio-frequency power amplifying stage exports effectively exports;
Harmonic suppression network, carries out harmonics restraint to the signal being input to Broadband emission matching network;
The output of described broadband radio-frequency power amplifying stage is connected to the output of radio-frequency (RF) power amplifier circuit by described harmonic suppression network and Broadband emission matching network, described harmonic suppression network is connected in parallel between the output of broadband radio-frequency power amplifying stage and ground by least two second harmonic Suppression networks and forms.
4. the circuit structure improving wide-band radio frequency power amplifier efficiency as claimed in claim 3, it is characterized in that, described second harmonic Suppression network is connected in series by an electric capacity and an inductance and forms, described second harmonic Suppression network one end is connected between described broadband radio-frequency power amplifying stage and Broadband emission matching network, other end ground connection, makes the second harmonic impedance of described width output matching network in whole working band all very low.
5. the circuit structure of the raising wide-band radio frequency power amplifier efficiency as described in claim 3 or 4, is characterized in that, described each second harmonic Suppression network difference resonance is on different second harmonic frequencies point.
6. the circuit structure improving wide-band radio frequency power amplifier efficiency as claimed in claim 3, it is characterized in that, described Broadband emission matching network comprises the first inductance, the first electric capacity, the second inductance, the second electric capacity and capacitance; Wherein, first inductance one end is the signal input part of Broadband emission matching network, and the other end connects the first electric capacity and the second inductance; First electric capacity one end connects the first inductance and the second inductance, other end ground connection; Second inductance one end connects the first inductance and the first electric capacity, and the other end connects the second electric capacity and capacitance; Second electric capacity one end connects the second inductance and capacitance, other end ground connection; Capacitance one end connects the second inductance and the second electric capacity, and the other end is the output of Broadband emission matching network.
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Application publication date: 20150617 |