CN112968678A - Radio frequency power amplifier and communication terminal - Google Patents
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Abstract
The embodiment of the application discloses radio frequency power amplifier and communication terminal, radio frequency power amplifier includes: the power supply resonant network and the power amplifier tube; the power resonant network includes: the device comprises a first inductive component, a second inductive component and a capacitor component; the input end of the first inductive component is used for being connected with a power supply; the output end of the first inductive component is respectively connected with the second inductive component and the capacitor component, and the second inductive component and the capacitor component are connected in parallel; the control end of the power amplifying tube is used for inputting radio frequency signals; the input end of the power amplification tube is connected with the output end of the power supply resonant network and used for outputting the amplified radio-frequency signal. In this way, by adding the first inductive component to the power supply network, the second inductive component and the capacitive component can form a resonant loop at 1/2 of the operating frequency, and the oscillation of the power amplifier is suppressed by resonance, thereby improving the stability of the amplifier.
Description
Technical Field
The present invention relates to the field of mobile communications, and in particular, to a radio frequency power amplifier and a communication terminal.
Background
In a mobile communication system, there is a strict requirement on the output spectrum of a front-end rf power amplifier in order not to interfere with other system operations. When the load impedance varies within a certain range, the radio frequency power amplifier needs to maintain stability. By stability, it is meant that the non-harmonic spurs of the output spectrum of the rf power amplifier must be less than a value determined by the relevant communication protocol, such as Long Term Evolution (LTE) system, which requires that the non-harmonic spurs be less than-36 dBm. When the non-harmonic spurs do not meet the requirements of the communication protocol, the radio frequency power amplifier is called to have stability problems, namely oscillation phenomena.
Non-harmonic spurs typically occur when the rf power amplifier outputs a higher power rf signal. In most cases, the non-harmonic spurs will be at the 1/2 frequency of the carrier frequency. With the development of communication protocols, radio frequency power amplifiers are required to meet the requirements of multi-mode and multi-frequency applications, and cover multiple frequency bands, that is, the radio frequency power amplifiers must ensure the stability of broadband. At present, in order to solve the oscillation problem, circuit parameters are generally required to be adjusted, but the performance of the radio frequency power amplifier is reduced.
Disclosure of Invention
In view of the above, embodiments of the present invention provide a radio frequency power amplifier and a communication terminal.
The technical scheme of the invention is realized as follows:
in a first aspect, an embodiment of the present invention provides a radio frequency power amplifier, including: the power supply resonant network and the power amplifier tube;
the power resonant network includes: the device comprises a first inductive component, a second inductive component and a capacitor component;
an input of the first inductive component for connection to a power supply;
the output end of the first inductive component is respectively connected with the second inductive component and the capacitor component, and the second inductive component and the capacitor component are connected in parallel;
the control end of the power amplifier tube is used for inputting radio frequency signals; the input end of the power amplifier tube is connected with the output end of the power supply resonant network and used for outputting the amplified radio frequency signal.
Further, the capacitive assembly includes:
at least one first capacitor with a fixed capacitance value;
alternatively, the first and second electrodes may be,
and the capacitance component is used for adjusting the capacitance value according to the working frequency of the radio frequency power amplifier.
Further, the power resonant network further comprises:
the plurality of resonant circuits are connected between the output end of the first inductive component and the second inductive component and between the second inductive component and the capacitor component; the plurality of resonant circuits are connected in series;
wherein each resonant circuit comprises: the device comprises an inductive device and a capacitive device, wherein the inductive device and the capacitive device are connected in parallel.
Further, the capacitive device comprises:
at least one second capacitor with a fixed capacitance value;
alternatively, the first and second electrodes may be,
and the capacitive device with the variable capacitance value is used for adjusting the capacitance value according to the working frequency of the radio frequency power amplifier.
Further, the capacitance component with variable capacitance value also comprises:
the capacitor comprises a first capacitor with a fixed capacitance value and a first variable capacitor, wherein the first capacitor is connected with the first variable capacitor in parallel;
alternatively, the first and second electrodes may be,
the circuit comprises a plurality of first capacitors connected in parallel, wherein at least one first capacitor is respectively connected with one switch in series.
Further, the capacitive device with a variable capacitance value further includes:
the second capacitor and the second variable capacitor are connected in parallel;
alternatively, the first and second electrodes may be,
and the second capacitors are connected in parallel, wherein at least one second capacitor is respectively connected with one switch in series.
Further, the radio frequency power amplifier further includes:
and the input end of the output matching network is connected with the input end of the power amplifying tube and is used for performing impedance matching on the amplified radio-frequency signal and outputting the radio-frequency signal after the impedance matching.
Further, the output matching network includes at least:
and the input end of the harmonic circuit is connected with the input end of the power amplifying tube and is used for inhibiting the harmonic generated by the power amplifying tube from being output from the matching network.
Further, the harmonic circuit includes at least: the harmonic capacitor component and the harmonic inductive component are connected in series;
in a second aspect, an embodiment of the present invention provides a communication terminal, including:
an antenna;
the radio frequency power amplifier according to one or more of the above technical solutions is connected to an antenna through a radio frequency link.
The invention provides a radio frequency power amplifier, comprising: the power supply resonant network and the power amplifier tube; the power resonant network includes: the device comprises a first inductive component, a second inductive component and a capacitor component; the input end of the first inductive component is used for being connected with a power supply; the output end of the first inductive component is respectively connected with the second inductive component and the capacitor component, and the second inductive component and the capacitor component are connected in parallel; the control end of the power amplifying tube is used for inputting radio frequency signals; the input end of the power amplification tube is connected with the output end of the power supply resonant network and used for outputting the amplified radio-frequency signal. Therefore, the coupling of the output signal of the power amplifying tube and the power supply can be reduced through the capacitor assembly while the power is provided for the power amplifying tube, and the noise in the power supply is filtered. And the influence of impedance uncertainty in the power supply resonant network on the power amplifier tube can be inhibited based on the equivalent open circuit state of the first inductive component under the working frequency, and the stability of the amplified radio-frequency signal is improved.
Drawings
Fig. 1 is a schematic structural diagram of a radio frequency power amplifier according to an embodiment of the present invention;
fig. 2 is a schematic diagram of an impedance of a power resonant network according to an embodiment of the invention;
fig. 3 is a schematic structural diagram of a radio frequency power amplifier according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a radio frequency power amplifier according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a radio frequency power amplifier according to an embodiment of the present invention;
fig. 6 is a schematic diagram of the impedance of a power resonant network according to an embodiment of the present invention;
fig. 7 is a schematic diagram illustrating a distribution of resonant points of a radio frequency power amplifier according to an embodiment of the present invention;
fig. 8 is a schematic structural diagram of a radio frequency power amplifier according to an embodiment of the present invention;
fig. 9 is a schematic structural diagram of a variable capacitor according to an embodiment of the present invention;
fig. 10 is a schematic structural diagram of a radio frequency power amplifier according to an embodiment of the present invention;
fig. 11 is a schematic structural diagram of a radio frequency power amplifier according to an embodiment of the present invention;
fig. 12 is a schematic structural diagram of a radio frequency power amplifier according to an embodiment of the present invention;
fig. 13 is a schematic structural diagram of a radio frequency power amplifier according to an embodiment of the present invention;
fig. 14 is a schematic structural diagram of a radio frequency power amplifier according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail with reference to the accompanying drawings, the described embodiments should not be construed as limiting the present invention, and all other embodiments obtained by a person of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.
In the following description, reference is made to "some embodiments" which describe a subset of all possible embodiments, but it is understood that "some embodiments" may be the same subset or different subsets of all possible embodiments, and may be combined with each other without conflict.
In the following description, references to the terms "first \ second \ third" are only to distinguish similar objects and do not denote a particular order, but rather the terms "first \ second \ third" are used to interchange specific orders or sequences, where appropriate, to enable embodiments of the invention described herein to be practiced in other than the order shown or described herein.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein is for the purpose of describing embodiments of the invention only and is not intended to be limiting of the invention.
As shown in fig. 1, an embodiment of the present invention provides a radio frequency power amplifier, including: a power resonant network 10 and a power amplifier tube 20;
the power resonant network 10 comprises: a first inductive component 11, a second inductive component 12 and a capacitive component 13;
the input end of the first inductive component 11 is used for being connected with a power supply;
the output end of the first inductive component 11 is connected to the second inductive component 12 and the capacitive component 13, respectively, and the second inductive component 12 and the capacitive component 13 are connected in parallel;
the control end of the power amplifying tube 20 is used for inputting radio frequency signals; the input end of the power amplifier tube 20 is connected to the output end of the power resonant network 10, and is configured to output an amplified radio frequency signal.
In the embodiment of the invention, because a power supply network has certain impedance, the radio-frequency signal input by the power amplifier is coupled with the radio-frequency signal output after amplification, so that the output signal Vout amplified by the power amplifier tube not only contains a signal with the frequency being a positive integral multiple of the working frequency, but also contains signal components with other frequencies, namely non-harmonic spurs. The anharmonic spurs are mostly concentrated at 1/2, the operating frequency, and therefore, resonance can be formed at 1/2 of the operating frequency for suppressing oscillations caused by the anharmonic spurs.
The first inductive component and the second inductive component are both elements with inductive parameters, such as an inductor coil, a closed-circuit magnetic core, etc.
The capacitive component is a single electronic component or circuit that exhibits capacitive properties as a whole.
Illustratively, the capacitive component may include one or more capacitors.
In one embodiment, the inductive component is a single electronic component or circuit that is inductive as a whole. Illustratively, the first inductive component and the second inductive component may each comprise one or more inductors. For example, the first inductive component may be an inductor L1. When L is1When the value of (2) is larger, the first inductive component is equivalent to an open circuit state under the working frequency, the second inductive component can be an inductance coil L2, and the second inductive component and the capacitance component can form parallel resonance.
The capacitor element is a fixed capacitor with a large capacitance value, such as C1=1000 μ F, the other end of the capacitor assembly may be grounded and used as a decoupling capacitor for filtering power supply noise.
The second inductive component may be an inductor L2，L2And C1Can be selected from the working frequency f of the radio frequency power amplifier0And (4) determining. The phenomenon of non-harmonic stray, namely oscillation, in the output signal of the power amplifier tube generally occurs
f0The resonant frequency of the parallel resonant circuit formed by the second inductive component and the capacitive component can be f1=
f0. According to the resonant frequency f1=
The second inductive component and the capacitive component may be sized.
As shown in fig. 2, at the resonant point 1/2 of the operating frequency, the impedance from the output end of the power amplifier tube to the power supply resonant network is almost 0 due to the resonance formed by the second inductive component and the capacitive component, so that the gain of the rf power amplifier at the operating frequency 1/2 is greatly reduced, and the oscillation phenomenon, i.e., half-frequency oscillation, generated at the operating frequency 1/2 is suppressed.
In this way, by connecting the power supply resonant network to the output end of the power amplifier tube, 1/2 frequency resonance can be formed at the output end of the power amplifier tube while supplying power to the radio frequency power amplifier. In the radio frequency signal output by the power amplifying tube, the oscillation generated at 1/2 of the working frequency in the output signal can be restrained through the resonance formed by the power supply resonant network at the working frequency 1/2, and the stability of the radio frequency power amplifier is improved. And an additional resonant network is not needed, and based on the inductive component and the capacitive component in the original power network, the resonant function of the power network can be realized only by adding one inductive component. On the basis of improving the stability of the radio frequency power amplifier, the production cost can be reduced, and the performance of the power amplifier is reduced without changing circuit parameters.
In some embodiments, the capacitive component 13 comprises:
at least one first capacitor with a fixed capacitance value;
alternatively, the first and second electrodes may be,
the capacitance component with the variable capacitance value is used for adjusting the capacitance value according to the working frequency of the radio frequency power amplifier.
In the embodiment of the present invention, the capacitor component may be a capacitor with a fixed capacitance value, and when the rf power amplifier is applied to the amplification processing of the multiband rf signal, the capacitor component may also be a variable capacitor with an adjustable capacitance value.
In one embodiment, as shown in FIG. 3, the capacitive component may be a variable capacitor having a carrier frequency f0When the radio frequency signal is amplified, the second inductive component L is used for amplifying the radio frequency signal2Size and f0The capacitance value of the capacitive component can be determined. When the radio frequency signal to be amplified is switched to the next frequency band, the carrier frequency of the radio frequency signal, i.e. the working frequency of the radio frequency power amplifier, is changed to
Then according to L2Size of and
and determining the capacitance value of the capacitance component and adjusting.
Therefore, the radio frequency power amplifier can restrain half-frequency oscillation in the amplified output signal for radio frequency signals of different frequency bands. The corresponding capacitance values are selected based on different working frequencies, so that the resonance point of the power supply resonance network can change along with the change of the working frequency of the radio frequency power amplifier, radio frequency signals of a plurality of frequency bands can be covered, and the broadband stability of the radio frequency power amplifier is greatly improved.
In some embodiments, as shown in fig. 4, the power resonant network 10 further includes:
a plurality of resonant circuits connected between the output of the first inductive component 11 and the second inductive component 12 and the capacitive component 13; the plurality of resonant circuits are connected in series;
wherein each of the resonant circuits comprises: the device comprises an inductive device and a capacitive device, wherein the inductive device and the capacitive device are connected in parallel.
In the embodiment of the invention, a plurality of resonant circuits are connected between the first inductive component and a parallel resonant loop formed by the second inductive component and the capacitive component, and form a multi-section resonant network together with the parallel resonant loop. The inductance of the inductive devices and the capacitance of the capacitive devices of the plurality of resonant circuits are different, and the size of the inductive devices and the size of the capacitive devices of each resonant circuit can be determined according to each working frequency of the radio frequency power amplifier. When the radio frequency power amplifier needs to work at a plurality of different working frequencies, a plurality of different resonance points can be generated based on a plurality of resonance circuits, and then half-frequency oscillation generated under the plurality of working frequencies is restrained respectively, so that the stability of the radio frequency power amplifier in a wider working frequency band is expanded.
In one embodiment, each resonant circuit is formed by connecting an inductor and a capacitor in parallel. For example, as shown in fig. 5, a resonant circuit formed by an inductor and a capacitor connected in parallel forms a two-section resonant network together with the second inductive component and the capacitor component. Because the inductance and the capacitance value in the resonant circuit are different from the values of the second inductive component and the capacitance component, the power supply resonant network has two different resonant points fos1 and fos2, as shown in fig. 6, at the two resonant points, the impedance from the output end of the power amplifier tube to the power supply resonant network is extremely small, and the stability of the radio frequency power amplifier is improved.
When the capacitor component and the capacitive device in the power resonant network are fixed capacitors with fixed capacitance values, the capacitance values of the fixed capacitors can only be adjusted within a certain range, and radio frequency signals with all working frequencies may not be effectively covered for a radio frequency power amplifier covering multiple frequency bands. Through setting up a plurality of resonant circuit, every resonant circuit can be according to the different operating frequency that needs covered, chooses for use the electric capacity subassembly or the capacitive device of different appearance value, makes a plurality of resonant circuit have different resonance points respectively.
As shown in fig. 7, the power resonant network has a plurality of resonance points, and each resonance point can generate resonance to suppress half-frequency oscillation generated by the radio frequency signal corresponding to the operating frequency. Therefore, the power supply resonant network can effectively cover radio frequency signals of a plurality of frequency bands without a variable capacitor, and can generate effective resonance for different working frequencies to inhibit half-frequency oscillation at each working frequency.
In some embodiments, as shown in fig. 8, the capacitive device comprises:
at least one second capacitor with a fixed capacitance value;
alternatively, the first and second electrodes may be,
and the capacitive device with the variable capacitance value is used for adjusting the capacitance value according to the working frequency of the radio frequency power amplifier.
In the embodiment of the invention, the capacitive devices in the plurality of resonant circuits can be fixed capacitors or variable capacitors. When the capacitive device is a fixed capacitor, the plurality of resonance points corresponding to the plurality of resonance circuits are also fixed, so that although a wider frequency band range can be covered, the flexibility still has a deficiency for radio frequency signals with frequently changed operating frequencies.
In one embodiment, the capacitive device in at least one resonant circuit is a capacitive device with a variable capacitance value, so that by arranging variable capacitors in a plurality of resonant circuits, each resonant circuit can cover an operating frequency range corresponding to the adjustable capacitance value range of the variable capacitor, and the power supply resonant network can better cover multiband radio frequency signals. The adjustment of the resonance point is more flexible under different working frequencies, and the broadband stability of the radio frequency power amplifier is further improved.
In some embodiments, as shown in fig. 9, the capacitance component with variable capacitance further includes:
the capacitor comprises a first capacitor with a fixed capacitance value and a first variable capacitor, wherein the first capacitor is connected with the first variable capacitor in parallel;
alternatively, the first and second electrodes may be,
the first capacitors are connected in parallel, wherein at least one first capacitor is respectively connected with one switch in series.
In the embodiment of the present invention, an alternative way of the variable capacitor is provided, such as a fixed capacitor connected in parallel with the variable capacitor, or a plurality of fixed capacitors connected in parallel and controlled by one switch respectively. Therefore, the adjustable capacitance value range of the capacitor assembly can be further improved, the variable range of the resonance point of the power supply resonance network is further enlarged, and the broadband stability of the radio frequency power amplifier is better.
It should be noted that the capacitance component with variable capacitance may also include other capacitance combinations with adjustable capacitance.
In some embodiments, the capacitive device with variable capacitance value further comprises:
the capacitance value of the second capacitor is fixed, and the second variable capacitor is connected in parallel with the second capacitor;
alternatively, the first and second electrodes may be,
and the second capacitors are connected in parallel, wherein at least one second capacitor is respectively connected with one switch in series.
In the embodiment of the invention, on the basis that the power supply resonant network is provided with a plurality of resonant circuits, the capacitance adjustable range of each resonant circuit can be further improved by connecting the capacitive devices in the plurality of resonant circuits in parallel with the fixed capacitors or respectively controlling the on-off of the plurality of fixed capacitors through the switches. Therefore, the radio frequency power amplifier with the plurality of resonant circuits can further obtain a larger processable frequency band range, and has stronger inhibition capability on half-frequency oscillation of radio frequency signals under more working frequencies.
It should be noted that, the capacitance-variable capacitive device may also include other capacitance combinations with adjustable capacitance.
In some embodiments, as shown in fig. 10, the radio frequency power amplifier further comprises:
and an input end of the matching network 30 is connected to an input end of the power amplifying tube 20, and is configured to perform impedance matching on the amplified radio frequency signal and output the radio frequency signal after impedance matching.
In the embodiment of the invention, the matching network is connected to the output end of the power amplifier tube and can receive the output signal of the power amplifier tube after the resonance suppression oscillation is generated through the power supply resonance network. The power amplifier tube and the load are connected through the impedance matching network, so that the output signal of the power amplifier tube can be subjected to impedance matching, and the load can obtain a radio-frequency signal with larger transmission power after impedance matching.
In one embodiment, the input end of the matching network is connected with the input end of the power amplifier tube, and the output end of the matching network can be directly connected with the load or can be connected with the load through other intermediate circuits.
Therefore, after the radio-frequency signal amplified by the power amplifier is inhibited from half-frequency oscillation by the power supply resonant network, impedance matching is carried out through the matching network, so that the load impedance is matched with the output impedance of the radio-frequency power amplifier, the waste of power caused by reflection of the radio-frequency signal in transmission is inhibited, the transmission of the radio-frequency signal can reach the maximum transmission coefficient, and the signal power and the utilization rate obtained by a load are maximized.
In some embodiments, as shown in fig. 11, the matching network 30 includes at least:
and the input end of the harmonic circuit 31 is connected with the input end of the power amplifying tube and is used for inhibiting the harmonic generated by the power amplifying tube from being output from the matching network.
In the embodiment of the invention, the amplified radio frequency signal output by the power amplifier tube has the existing frequency which is the working frequency f of the amplifier0Also having a frequency of N x f0Wherein N is a positive integer greater than 1. The harmonic circuit is connected to the input end of the power amplifying tube, so that harmonic components in output signals of the power amplifying tube can be restrained, and negative effects of the harmonic components in the output signals on loads are reduced.
In one embodiment, the harmonic circuit is connected between the input end of the power amplifier tube and the ground, and is used for transmitting the harmonic component in the amplified radio-frequency signal to the ground and suppressing the harmonic component from being output to the load from the matching network.
In some embodiments, as shown in fig. 12, the harmonic circuit 31 includes at least: a harmonic capacitance component 311 and a harmonic inductive component 312, wherein the harmonic capacitance component 311 and the harmonic inductive component 312 are connected in series;
in the embodiment of the invention, the harmonic circuit has the impedance of almost 0 at the resonance point through the series resonance circuit formed by the harmonic capacitor component and the harmonic inductance component, so that the harmonic circuit is in an equivalent short circuit state, and the harmonic in the amplified radio-frequency signal is transmitted to the ground.
In one embodiment, the matching network may further include a matching circuit, and an input terminal of the matching circuit is connected to the input terminal of the harmonic circuit and the input terminal of the power amplifier tube, and is configured to perform impedance matching on the amplified radio frequency signal and output the impedance-matched radio frequency signal. As shown in fig. 13, the matching circuit may include two sets of matching inductive components and matching capacitive components connected in parallel, and the output end of the matching circuit is connected to a load, so that load matching of the radio frequency signal after the harmonic suppression may be achieved.
In one embodiment, the harmonic capacitor component may be a variable capacitor with a variable capacitance value, a fixed capacitor with a fixed capacitance value connected in parallel with the variable capacitor, or a plurality of fixed capacitors connected in parallel, wherein at least one fixed capacitor is connected in series with one switch respectively. For radio frequency signals which need to cover multiple frequency bands, the frequency of harmonics in the radio frequency signals output by the power amplifier tube also varies within a certain range. Through the capacitance value adjustment of the variable capacitor, the harmonic circuit can be ensured to effectively filter out harmonic waves in radio frequency signals for different working frequencies.
Therefore, based on the series resonance formed by the harmonic capacitance component and the harmonic inductance component, the impedance at the resonance point is almost 0, the harmonic generated in the radio-frequency signal can be transmitted to the ground, and the low utilization rate of the radio-frequency signal caused by the fact that the harmonic is transmitted to the load is effectively inhibited.
An embodiment of the present invention provides a communication terminal, including:
an antenna;
the radio frequency power amplifier according to one or more of the above technical solutions is connected to the antenna through a radio frequency link.
In the embodiment of the invention, the radio-frequency signals with the oscillation and harmonic components suppressed after amplification can be obtained based on the radio-frequency power amplifier, the radio-frequency signals are transmitted to the antenna through the radio-frequency link, and the antenna transmits the radio-frequency signals, so that the mobile communication based on the radio-frequency signals is realized.
Because the half-frequency oscillation is restrained by the resonance generated by the power supply resonant network, the non-harmonic stray value in the output frequency spectrum of the radio frequency power amplifier is reduced, the stability and the reliability of the mobile communication are greatly improved, and the interference to other communication systems is reduced.
One specific example is provided below in connection with any of the embodiments described above:
1. by utilizing a power supply network, 1/2 frequency resonance is formed, 1/2 frequency oscillation is suppressed, and the stability problem of the front-end power amplifier is improved. As shown in fig. 14, the power resonant network is formed by an inductor LchokeAnd a decoupling capacitor CdecapConstitution CdecapThe function is to filter power supply noise, and the value is generally larger. By utilizing the power supply resonant network, 1/2 frequency resonance is formed, and the stability problem of the front-end power amplifier is improved. As shown in fig. 14, C1 and L1 constitute a harmonic short circuit; l2, C2, L3 and C3 form a matching circuit, and the output end Pout of the output matching network is connected with a load. Wherein L ischoke2Is generally sufficiently large, Lchoke1And a fixed capacitor CdecapForming a parallel resonant network, wherein the working frequency of the radio frequency power amplifier is fo, and the resonant point is located at
Near fo frequency. The impedance of the output node Vout of the amplifier tube looking at the power line is nearly short-circuited at the resonance point, thereby greatly reducing the impedance of the front-end power amplifier
The gain at fo frequency solves the stability problem caused by 1/2 frequency oscillation.
For multi-mode multi-band applications, the front-end power amplifier needs to cover multiple frequency bands and maintain wideband stability. The embodiment of the invention solves the problem of broadband stability of the front-end power amplifier.
2. The method solves the problem of the broadband stability of the front-end power amplifier and has three schemes: variable CdecapCapacitance scheme, multi-section power supply resonant network scheme and variable CdecapThe capacitor and multi-section power supply resonant network combination scheme;
variable CdecapThe capacitance scheme is as follows: the invention is realized by adjusting CdecapThe capacitance value of the capacitor improves the stability of a broadband large signal of the power amplifier. When the front-end radio frequency power amplifier switches the working frequency band, the variable capacitor C is adjusteddecapThe capacitance value is kept, so that the resonance point is always close to 1/2 frequency of the working frequency, 1/2 frequency oscillation of the corresponding working frequency band is inhibited, and the broadband stability of the front-end radio frequency power amplifier is ensured. Optionally, the fixed capacitor in the power resonant network is replaced by a variable capacitor, and the variable capacitor has two variations: (1) the fixed capacitor is connected with the variable capacitor in parallel; (2) several fixed capacitors are connected in parallel, but the on and off of some of the fixed capacitors can be switched by switches.
The scheme of the multi-section power supply resonant network comprises the following steps: a plurality of resonance points are formed by utilizing a plurality of sections of power supply resonance networks, so that a wider half-frequency band is covered, and the broadband stability of the front-end power amplifier is ensured. The node impedance of the input end Vout node of the power amplifier tube is almost 0 at the resonance point when being seen to the power supply resonance network. Capacitor Cdecap2Forming a high frequency resonance point fos2Capacitor Cdecap1Forming a low frequency resonance point fos1。
Variable CdecapThe capacitor and multi-section power supply resonant network combination scheme is as follows: one, more or all of the multiple sections of the power resonant network are replaced by variable capacitors.
In the several embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other ways. The above-described device embodiments are merely illustrative, for example, the division of the unit is only a logical functional division, and there may be other division ways in actual implementation, such as: multiple units or components may be combined, or may be integrated into another system, or some features may be omitted, or not implemented. In addition, the coupling, direct coupling or communication connection between the components shown or discussed may be through some interfaces, indirect coupling or communication connection between devices or units, and may be electrical, mechanical or other driving.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed on a plurality of network units; some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, all the functional units in the embodiments of the present invention may be integrated into one processing module, or each unit may be separately used as one unit, or two or more units may be integrated into one unit; the integrated unit can be realized by hardware running or by hardware and software functional units.
In some cases, any two of the above technical features may be combined into a new method solution without conflict.
In some cases, any two of the above technical features may be combined into a new device solution without conflict.
Those of ordinary skill in the art will understand that: all or part of the steps for implementing the method embodiments may be implemented by hardware related to program instructions, and the program may be stored in a computer readable storage medium, and when executed, the program performs the steps including the method embodiments; and the aforementioned storage medium includes: various media capable of storing program codes, such as a removable Memory device, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, and an optical disk.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (10)
1. A radio frequency power amplifier, comprising: the power supply resonant network and the power amplifier tube;
the power resonant network includes: the device comprises a first inductive component, a second inductive component and a capacitor component;
the input end of the first inductive component is used for being connected with a power supply;
the output end of the first inductive component is respectively connected with the second inductive component and the capacitor component, and the second inductive component and the capacitor component are connected in parallel;
the control end of the power amplifying tube is used for inputting radio frequency signals; the input end of the power amplification tube is connected with the output end of the power supply resonant network and used for outputting the amplified radio-frequency signal.
2. The radio frequency power amplifier of claim 1, wherein the capacitive component comprises:
at least one first capacitor with a fixed capacitance value;
alternatively, the first and second electrodes may be,
the capacitance component with the variable capacitance value is used for adjusting the capacitance value according to the working frequency of the radio frequency power amplifier.
3. The radio frequency power amplifier of claim 1, wherein the power supply resonant network further comprises:
a plurality of resonant circuits connected between the output of the first inductive component and the second inductive component and the capacitive component; the plurality of resonant circuits are connected in series;
wherein each of the resonant circuits comprises: the device comprises an inductive device and a capacitive device, wherein the inductive device and the capacitive device are connected in parallel.
4. The radio frequency power amplifier of claim 3, wherein the capacitive device comprises:
at least one second capacitor with a fixed capacitance value;
alternatively, the first and second electrodes may be,
and the capacitive device with the variable capacitance value is used for adjusting the capacitance value according to the working frequency of the radio frequency power amplifier.
5. The radio frequency power amplifier of claim 2, wherein the capacitance component with the variable capacitance value further comprises:
the capacitor comprises a first capacitor with a fixed capacitance value and a first variable capacitor, wherein the first capacitor is connected with the first variable capacitor in parallel;
alternatively, the first and second electrodes may be,
the first capacitors are connected in parallel, wherein at least one first capacitor is respectively connected with one switch in series.
6. The radio frequency power amplifier of claim 4, wherein the capacitive device with a variable capacitance value further comprises:
the capacitance value of the second capacitor is fixed, and the second variable capacitor is connected in parallel with the second capacitor;
alternatively, the first and second electrodes may be,
and the second capacitors are connected in parallel, wherein at least one second capacitor is respectively connected with one switch in series.
7. The radio frequency power amplifier of claim 1, further comprising:
and the input end of the matching network is connected with the input end of the power amplifying tube and is used for performing impedance matching on the amplified radio-frequency signal and outputting the radio-frequency signal after impedance matching.
8. The radio frequency power amplifier of claim 7, wherein the matching network comprises at least:
and the input end of the harmonic circuit is connected with the input end of the power amplifying tube and is used for inhibiting the harmonic generated by the power amplifying tube from being output from the matching network.
9. The radio frequency power amplifier of claim 8, wherein the harmonic circuit comprises at least: the harmonic wave inductive component is connected with the harmonic wave capacitive component in series.
10. A communication terminal, comprising:
an antenna;
the radio frequency power amplifier as provided in any of claims 1 to 9, connected to said antenna by a radio frequency link.
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| CN202110183390.0A CN112968678A (en) | 2021-02-10 | 2021-02-10 | Radio frequency power amplifier and communication terminal |
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| CN202110183390.0A CN112968678A (en) | 2021-02-10 | 2021-02-10 | Radio frequency power amplifier and communication terminal |
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| CN116015216A (en) * | 2022-12-29 | 2023-04-25 | 广州慧智微电子股份有限公司 | Power amplifier circuit and electronic equipment |
| CN116996096A (en) * | 2023-06-27 | 2023-11-03 | 锐石创芯(深圳)科技股份有限公司 | Radio frequency front end module |
| WO2024007727A1 (en) * | 2022-07-06 | 2024-01-11 | 深圳飞骧科技股份有限公司 | Power amplifier |
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