CN115882796A - Radio frequency power amplifier and radio frequency module - Google Patents
Radio frequency power amplifier and radio frequency module Download PDFInfo
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- CN115882796A CN115882796A CN202211616429.4A CN202211616429A CN115882796A CN 115882796 A CN115882796 A CN 115882796A CN 202211616429 A CN202211616429 A CN 202211616429A CN 115882796 A CN115882796 A CN 115882796A
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Abstract
The invention provides a radio frequency power amplifier and a radio frequency module, which comprise a substrate input unit, a power amplifier unit and a substrate output unit; the power amplifier unit comprises a first input radio frequency matching network, a first driving stage power amplifier, a first inter-stage matching network, a first amplification stage power amplifier, a second input radio frequency matching network, a second driving stage power amplifier, a second inter-stage matching network, a second amplification stage power amplifier, a twelfth capacitor, a thirteenth capacitor and a ninth capacitor; the first input radio frequency matching network comprises a third capacitor and a third inductor; the first inter-stage matching network comprises a seventh inductor, a fifth capacitor, a fifth inductor and a seventh capacitor; the second input radio frequency matching network comprises a fourth capacitor and a fourth inductor; the second inter-stage matching network comprises an eighth inductor, a sixth capacitor, a sixth inductor and an eighth capacitor. The technical scheme of the invention has high working bandwidth and good harmonic suppression effect when the output power is high.
Description
Technical Field
The invention relates to the technical field of circuits, in particular to a radio frequency power amplifier and a radio frequency module.
Background
At present, in a satellite communication system, a radio frequency front end has a large influence on communication quality, wherein a radio frequency power amplifier is used as a key device of the radio frequency front end.
Related art radio frequency power amplifiers generally include a driver amplifier, a first input matching network, a carrier power amplifier, a second input matching network, a peaking power amplifier, a first output matching network, and a second output matching network.
However, the related art radio frequency power amplifier is used in a satellite communication system. Modern satellite communication is mainly applied to areas (such as unmanned areas, deserts, oceans, polar regions and the like) which cannot be covered by common mobile communication signals or under the condition that communication base stations are damaged (such as earthquakes, floods, typhoons and the like), and the accuracy and the stability of a communication system are particularly critical because the communication environment is more severe and complicated and the communication distance between a terminal and a satellite is farther than that of a cellular mobile network. When the handheld wireless terminal works normally, the handheld wireless terminal can directly carry out bidirectional information transmission with a satellite and a ground monitoring central station through satellite signals, and the communication mode takes a short message form as a transmission basic unit. Compared with cellular mobile communication, due to the longer distance, the rf power amplifier, which is a key device of the rf front end, needs to output higher saturation power, and the rf power amplifier usually operates in a non-linear region at high power output, which generates a series of harmonic components. When the rf power amplifier module operates at high power output and saturation output, it is difficult to simultaneously achieve a wider operating bandwidth and higher harmonic suppression.
Therefore, there is a need to provide a new rf power amplifier and module to solve the above problems.
Disclosure of Invention
In view of the above deficiencies of the prior art, the present invention provides a radio frequency power amplifier and a radio frequency module having high operating bandwidth and good harmonic suppression effect when the output power is high.
In order to solve the above technical problem, in a first aspect, an embodiment of the present invention provides a radio frequency power amplifier, including a substrate input unit, a power amplifier unit, and a substrate output unit, which are connected in sequence;
the substrate input unit is used for receiving an external single-ended signal and converting the external single-ended signal into two paths of first signals with the same power and 180-degree phase difference;
the power amplifier unit is used for amplifying the power of the two first signals and then generating two second signals;
the substrate output unit is used for receiving the two paths of second signals, then carrying out power synthesis to convert the two paths of second signals into one path of third signals, and outputting the third signals after suppressing the harmonic waves of the third signals;
the power amplifier unit comprises a first input radio frequency matching network, a first driving stage power amplifier, a first inter-stage matching network, a first amplification stage power amplifier, a second input radio frequency matching network, a second driving stage power amplifier, a second inter-stage matching network, a second amplification stage power amplifier, a twelfth capacitor, a thirteenth capacitor and a ninth capacitor; the first input radio frequency matching network comprises a third capacitor and a third inductor; the first inter-stage matching network comprises a seventh inductor, a fifth capacitor, a fifth inductor and a seventh capacitor; the second input radio frequency matching network comprises a fourth capacitor and a fourth inductor; the second inter-stage matching network comprises an eighth inductor, a sixth capacitor, a sixth inductor and an eighth capacitor;
a first end of the third capacitor is used as a first input end of the power amplifier unit, the first end of the third capacitor is connected to a first end of the third inductor, and a second end of the third inductor is grounded;
a second end of the third capacitor is connected to the input end of the first driving stage power amplifier;
the output end of the first driving stage power amplifier is respectively connected to the second end of the seventh inductor and the first end of the fifth capacitor;
a first end of the seventh inductor is connected to a first power voltage, a first end of the eighth inductor, a first end of the twelfth capacitor, and a first end of the thirteenth capacitor, respectively, a second end of the twelfth capacitor is grounded, and a second end of the thirteenth capacitor is grounded;
a second end of the fifth capacitor is connected to a first end of the fifth inductor and a first end of the seventh capacitor, respectively, and a second end of the fifth inductor is grounded;
a second end of the seventh capacitor is connected to the input end of the first amplification stage power amplifier;
the output end of the first amplification stage power amplifier is used as the first output end of the power amplifier unit, and the output end of the first amplification stage power amplifier is connected to the first end of the ninth capacitor;
a first end of the fourth capacitor is used as a second input end of the power amplifier unit, the first end of the fourth capacitor is connected to a first end of the fourth inductor, and a second end of the fourth inductor is grounded;
a second end of the fourth capacitor is connected to the input end of the second driving stage power amplifier;
the output end of the second driving stage power amplifier is respectively connected to the second end of the eighth inductor and the first end of the sixth capacitor;
a second end of the sixth capacitor is connected to the first end of the sixth inductor and the first end of the eighth capacitor, respectively, and a second end of the sixth inductor is grounded;
a second end of the eighth capacitor is connected to the input end of the second amplification stage power amplifier;
the output end of the second amplifier stage power amplifier is used as the second output end of the power amplifier unit, and the output end of the second amplifier stage power amplifier is connected to the second end of the ninth capacitor.
Preferably, the substrate input unit is an LC lumped balun.
Preferably, the substrate input unit includes a first capacitor, a second capacitor, a first inductor and a second inductor;
the first end of the first capacitor is used as the input end of the substrate input unit, and the first end of the first capacitor is connected to the first end of the second inductor;
the second end of the first capacitor is used as the first output end of the substrate input unit, the second end of the first capacitor is connected to the first end of the first inductor, and the second end of the first inductor is grounded;
the second end of the second inductor is used as the second output end of the substrate input unit, the second end of the second inductor is connected to the first end of the second capacitor, and the second end of the second capacitor is grounded.
Preferably, the substrate output unit includes a transformer, a tenth capacitor, an eleventh capacitor, a fourteenth capacitor, a series resonant network, and an output matching circuit;
the series resonant network is used for suppressing harmonic waves of more than four orders;
the output matching circuit is used for matching output impedance;
a first end of a primary coil of the transformer is used as a first input end of the substrate output unit; a second end of the primary coil of the transformer is used as a second input end of the substrate output unit;
a central tap end of a primary coil of the transformer is connected to a first end of the tenth capacitor, a first end of the fourteenth capacitor and a second power supply voltage, a second end of the tenth capacitor is grounded, and a second end of the fourteenth capacitor is grounded;
the first end of the secondary coil of the transformer is respectively connected with the interface end of the series resonant network and the input end of the output matching circuit;
a second end of the secondary coil of the transformer is connected to a first end of the eleventh capacitor, and a second end of the eleventh capacitor is grounded;
and the output end of the output matching circuit is used as the output end of the substrate output unit.
Preferably, the series resonant network includes a fifteenth capacitor, a sixteenth capacitor, a ninth inductor and a tenth inductor;
a first end of the fifteenth capacitor serves as an interface end of the series resonant network, and the first end of the fifteenth capacitor is connected to the first end of the sixteenth capacitor;
a second end of the fifteenth capacitor is connected to a first end of the ninth inductor, and a second end of the ninth inductor is grounded;
a second end of the sixteenth capacitor is connected to the first end of the tenth inductor, and a second end of the tenth inductor is grounded.
Preferably, the output matching circuit comprises a first low-pass matching network, a second low-pass matching network, a third low-pass matching network and a band-stop matching network which are connected in sequence.
Preferably, the first low-pass matching network includes an eleventh inductor, a seventeenth capacitor, and a twelfth inductor;
the second low-pass matching network comprises a thirteenth inductor, an eighteenth capacitor and a fourteenth inductor;
the third low-pass matching network comprises a fifteenth inductor, a nineteenth capacitor and a sixteenth inductor;
the band-stop matching network comprises a twentieth capacitor and a seventeenth inductor;
a first end of the eleventh inductor is used as an input end of the output matching circuit;
a second end of the eleventh inductor is connected to a first end of the seventeenth capacitor and a first end of the thirteenth inductor, respectively; a second end of the seventeenth capacitor is connected to a first end of the twelfth inductor, and a second end of the twelfth inductor is grounded;
a second end of the thirteenth inductor is connected to a first end of the eighteenth capacitor and a first end of the fifteenth inductor respectively; a second end of the eighteenth capacitor is connected to a first end of the fourteenth inductor, and a second end of the fourteenth inductor is grounded;
a second end of the fifteenth inductor is connected to the first end of the nineteenth capacitor, the first end of the twentieth capacitor and the first end of the seventeenth inductor, respectively; a second end of the nineteenth capacitor is connected to a first end of the sixteenth inductor, and a second end of the sixteenth inductor is grounded;
a second terminal of the twentieth capacitor is used as an input terminal of the output matching circuit, and the second terminal of the twentieth capacitor is connected to the second terminal of the seventeenth inductor.
Preferably, the third capacitor, the fourth capacitor, the fifth capacitor, the sixth capacitor, the seventh capacitor, the eighth capacitor and the ninth capacitor are all STACK capacitors or MIM capacitors.
In a second aspect, an embodiment of the present invention further provides a radio frequency module, where the radio frequency module includes a substrate and the radio frequency power amplifier, which is soldered to the substrate and provided by the embodiment of the present invention.
Preferably, the power amplifier unit is a semiconductor chip; the substrate input unit and the substrate output unit are both made of a plurality of discrete components.
Compared with the prior art, the radio frequency power amplifier and the radio frequency module of the invention have the advantages that the power amplifier unit is internally provided with the first inter-stage matching network and the second inter-stage matching network. The first inter-stage matching network comprises a seventh inductor, a fifth capacitor, a fifth inductor and a seventh capacitor; the second inter-stage matching network comprises an eighth inductor, a sixth capacitor, a sixth inductor and an eighth capacitor; the first inter-stage matching network and the second inter-stage matching network improve the frequency bandwidth of the matching network, and further improve the working bandwidth of the radio-frequency power amplifier, so that the working bandwidth of the radio-frequency power amplifier is high. Preferably, the radio frequency power amplifier of the invention is provided with a substrate input unit and a substrate output unit respectively in front of and behind the power amplifier unit, the balun of the substrate input unit and the transformer of the substrate output unit form the realized differential power amplifier, and the differential structure can also realize the function of strengthening and inhibiting the dual harmonic. The series resonance network of the substrate output unit suppresses harmonic waves of more than four orders; the output matching circuit of the substrate output unit realizes suppression of second-order harmonic waves and third-order harmonic waves. Therefore, the radio frequency power amplifier and the radio frequency module have good harmonic suppression effect when the output power is high.
Drawings
The present invention is described in detail below with reference to the attached drawings. The foregoing and other aspects of the invention will become more apparent and more readily appreciated from the following detailed description, taken in conjunction with the accompanying drawings. In the drawings, there is shown in the drawings,
fig. 1 is a schematic circuit diagram of a related art rf power amplifier;
fig. 2 is a circuit diagram of a substrate input unit of the rf power amplifier of the present invention;
FIG. 3 is a circuit diagram of a substrate output unit of the RF power amplifier of the present invention;
fig. 4 is a graph of gain versus frequency for an rf power amplifier according to an embodiment of the present invention;
fig. 5 is a graph illustrating a relationship between a gain and an output power of an rf power amplifier according to an embodiment of the invention.
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings.
The embodiments/examples described herein are specific embodiments of the present invention, are intended to be illustrative of the concepts of the present invention, are intended to be illustrative and exemplary, and should not be construed as limiting the embodiments and scope of the invention. In addition to the embodiments described herein, those skilled in the art will be able to employ other technical solutions which are obvious based on the disclosure of the claims and the specification of the present application, and these technical solutions include those which make any obvious replacement or modification of the embodiments described herein, and all of which are within the scope of the present invention.
(embodiment one)
An embodiment of the invention provides a radio frequency power amplifier 100.
Referring to fig. 1, fig. 1 is a circuit diagram of a related art rf power amplifier 100. Specifically, the radio frequency power amplifier 100 includes a substrate input unit 1, a power amplifier unit 2, and a substrate output unit 3, which are connected in sequence.
The circuit connection relationship of the rf power amplifier 100 is as follows:
the input end of the substrate input unit 1 serves as the input end RFin of the rf power amplifier 100.
A first output terminal of the substrate input unit 1 is connected to a first input terminal of the power amplifier unit 2. A second output terminal of the substrate input unit 1 is connected to a second input terminal of the power amplifier unit 2.
A first output terminal of the power amplifier unit 2 is connected to a first input terminal of the substrate output unit 3.
A second output of the power amplifier unit 2 is connected to a second input of the substrate output unit 3.
The output terminal of the substrate output unit 3 serves as the output terminal RFout of the rf power amplifier 100.
The substrate input unit 1 is configured to receive an external single-ended signal and convert the external single-ended signal into two first signals having the same power and a phase difference of 180 °. The substrate input unit 1 is also used for 50 ohm matching of the input terminal RFin of the rf power amplifier 100.
In this embodiment, the substrate input unit 1 is an LC lumped balun. The LC lumped balun has the advantages of achieving flexibility, the substrate input unit 1 is built on an off-chip substrate through SMD elements, chip area is effectively reduced, dependence on manufacturing processes of semiconductor manufacturers is reduced, and cost is saved; in addition, the advantage of the LC lumped balun is that a 180 ° phase difference can be achieved within a larger operating band bandwidth.
Referring to fig. 2, fig. 2 is a circuit diagram of the substrate input unit 1 of the rf power amplifier 100 according to the present invention. Specifically, the substrate input unit 1 includes a first capacitor, a second capacitor, a first inductor, and a second inductor.
The circuit connection relationship of the substrate input unit 1 is as follows:
the first end of the first capacitor is used as the input end of the substrate input unit 1, and the first end of the first capacitor is connected to the first end of the second inductor.
The second end of the first capacitor is used as the first output end of the substrate input unit 1, and the second end of the first capacitor is connected to the first end of the first inductor. The second end of the first inductor is grounded GND.
The second end of the second inductor is used as the second output end of the substrate input unit 1, and the second end of the second inductor is connected to the first end of the second capacitor. And the second end of the second capacitor is grounded GND.
The power amplifier unit 2 is configured to amplify the power of the two first signals and generate two second signals.
Specifically, the power amplifier unit 2 includes a first input radio frequency matching network 21, a first driver stage power amplifier DA1, a first inter-stage matching network 22, a first amplifier stage power amplifier PA1, a second input radio frequency matching network 23, a second driver stage power amplifier DA2, a second inter-stage matching network 24, a second amplifier stage power amplifier PA2, a twelfth capacitor C12, a thirteenth capacitor C13, and a ninth capacitor C9.
The first input rf matching network 21 includes a third capacitor C3 and a third inductor L3.
The first inter-stage matching network 22 includes a seventh inductor L7, a fifth capacitor C5, a fifth inductor L5, and a seventh capacitor C7. The first inter-stage matching network 22 forms a CLCL radio frequency matching network.
The second input rf matching network 23 includes a fourth capacitor C4 and a fourth inductor L4.
The second inter-stage matching network 24 includes an eighth inductor L8, a sixth capacitor C6, a sixth inductor L6, and an eighth capacitor C8. The second inter-stage matching network 24 constitutes another CLCL radio frequency matching network.
In this embodiment, the third capacitor C3, the fourth capacitor C4, the fifth capacitor C5, the sixth capacitor C6, the seventh capacitor C7, the eighth capacitor C8, and the ninth capacitor C9 are all STACK capacitors or MIM capacitors.
The circuit connection relationship of the power amplifier unit 2 is as follows:
a first end of the third capacitor C3 is used as a first input end of the power amplifier unit 2, and a first end of the third capacitor C3 is connected to a first end of the third inductor L3. A second end of the third inductor L3 is grounded GND.
A second end of the third capacitor C3 is connected to the input end of the first driver stage power amplifier DA 1.
An output end of the first driver stage power amplifier DA1 is connected to the second end of the seventh inductor L7 and the first end of the fifth capacitor C5, respectively.
A first end of the seventh inductor L7 is connected to a first power voltage VCC1, a first end of the eighth inductor L8, a first end of the twelfth capacitor C12, and a first end of the thirteenth capacitor C13, respectively. A second end of the twelfth capacitor C12 is grounded to GND. A second terminal of the thirteenth capacitor C13 is grounded to GND.
A second end of the fifth capacitor C5 is connected to the first end of the fifth inductor L5 and the first end of the seventh capacitor C7, respectively. The second end of the fifth inductor L5 is grounded GND.
A second end of the seventh capacitor C7 is connected to the input end of the first amplifier stage power amplifier PA 1.
The output terminal of the first amplifier stage PA1 serves as the first output terminal of the power amplifier unit 2, and the output terminal of the first amplifier stage PA1 is connected to the first terminal of the ninth capacitor C9.
A first end of the fourth capacitor C4 is used as a second input end of the power amplifier unit 2, and a first end of the fourth capacitor C4 is connected to a first end of the fourth inductor L4. The second end of the fourth inductor L4 is grounded GND.
A second end of the fourth capacitor C4 is connected to the input end of the second driver stage power amplifier DA 2.
The output end of the second driver stage power amplifier DA2 is connected to the second end of the eighth inductor L8 and the first end of the sixth capacitor C6, respectively.
A second end of the sixth capacitor C6 is connected to the first end of the sixth inductor L6 and the first end of the eighth capacitor C8, respectively. The second end of the sixth inductor L6 is grounded GND.
A second end of the eighth capacitor C8 is connected to the input end of the second amplifier stage PA 2.
The output terminal of the second amplifier stage PA2 serves as the second output terminal of the power amplifier unit 2, and the output terminal of the second amplifier stage PA2 is connected to the second terminal of the ninth capacitor C9.
A first inter-stage matching network 22 is arranged between a first driving stage power amplifier DA1 and a first amplification stage power amplifier PA1 of the power amplifier unit 2; a second inter-stage matching network 24 is arranged between the second driver stage power amplifier DA2 and the second amplifier stage power amplifier PA2 of the power amplifier unit 2, and both the two paths of matching networks adopt two-stage matching, so that the frequency bandwidth of the matching networks can be increased, and further, the working bandwidth of the radio frequency power amplifier 100 is increased.
The seventh inductor L7 is connected to the twelfth capacitor C12, and the eighth inductor L8 is connected to the thirteenth capacitor C13. The main function of the two capacitors C12 and C13 is to provide a bypass capacitor for power supply of the power amplifier unit 2, so that the output power of the rf power amplifier 100 is high.
The substrate output unit 3 is configured to receive the two paths of second signals output by the power amplifier unit 2, perform power synthesis to convert the two paths of second signals into one path of third signals, and suppress harmonics of the third signals and output the third signals.
Referring to fig. 3, fig. 3 is a circuit diagram of the substrate output unit 3 of the rf power amplifier 100 according to the present invention.
Specifically, the substrate output unit 3 includes a transformer TF1, a tenth capacitor C10, an eleventh capacitor C11, a fourteenth capacitor C14, a series resonant network 31, and an output matching circuit 32.
The ninth capacitor C9, the tenth capacitor C10, and the eleventh capacitor C11 are respectively used for a balanced port tuning capacitor of the transformer TF1, and further realize adjustment of the output impedance of the first amplifier stage power amplifier PA1 and the output impedance of the second amplifier stage power amplifier PA 2. Besides realizing power synthesis of two paths of input differential signals, the transformer TF1 also plays a role of a blocking capacitor, can reduce the number of SMD in a module and saves cost.
The balun of the substrate input unit 1 and the transformer TF1 of the substrate output unit 3 form a realized differential power amplifier, and structurally, the realized differential power amplifier can realize the functions of power synthesis and output power promotion of the radio frequency power amplifier, and the differential structure can also realize the function of strengthening and inhibiting the even harmonic waves.
The circuit connection relationship of the substrate output unit 3 is as follows:
a first end of the primary coil of the transformer TF1 serves as a first input end of the substrate output unit 3. A second end of the primary coil of the transformer TF1 serves as a second input end of the substrate output unit 3.
A center tap end of the primary winding of the transformer TF1 is connected to a first end of the tenth capacitor C10, a first end of the fourteenth capacitor C14, and the second power voltage VCC2. A second terminal of the tenth capacitor C10 is grounded to GND. A second terminal of the fourteenth capacitor C14 is connected to the ground GND.
A first end of the secondary coil of the transformer TF1 is connected to an interface end of the series resonant network 31 and an input end of the output matching circuit 32, respectively.
A second terminal of the secondary winding of the transformer TF1 is connected to a first terminal of the eleventh capacitor C11. The second end of the eleventh capacitor C11 is grounded to GND.
The output terminal of the output matching circuit 32 serves as the output terminal of the substrate output unit 3.
The series resonant network 31 is used to suppress harmonics of order four or more. Specifically, the series resonant network 31 includes a fifteenth capacitor C15, a sixteenth capacitor C16, a ninth inductor L9, and a tenth inductor L10. The ninth inductor L9 and the fifteenth capacitor C15 form a series resonant circuit (Trap) that mainly suppresses harmonics of more than four orders. The tenth inductor L10 and the sixteenth capacitor C16 form another series resonant circuit (Trap) that mainly suppresses harmonics above the fourth order. The fifteenth capacitor C15 and the sixteenth capacitor C16 are respectively used for a balanced port tuning capacitor of the transformer TF1, and further realize adjustment of the output impedance of the first amplifier stage power amplifier PA1 and the output impedance of the second amplifier stage power amplifier PA 2.
The circuit connection relationship of the series resonant network 31 is as follows:
a first end of the fifteenth capacitor C15 serves as an interface end of the series resonant network 31, and a first end of the fifteenth capacitor C15 is connected to a first end of the sixteenth capacitor C16.
A second end of the fifteenth capacitor C15 is connected to the first end of the ninth inductor L9. The second end of the ninth inductor L9 is grounded to GND.
A second end of the sixteenth capacitor C16 is connected to the first end of the tenth inductor L10. A second end of the tenth inductor L10 is grounded to GND.
The output matching circuit 32 is used for matching the output impedance.
Specifically, the output matching circuit 32 includes a first lowpass matching network 321, a second lowpass matching network 322, a third lowpass matching network 323, and a bandstop matching network 324, which are connected in sequence.
The first low-pass matching network 321 includes an eleventh inductor L11, a seventeenth capacitor C17, and a twelfth inductor L12. A series resonant circuit (Trap) formed by the seventeenth capacitor C17 and the twelfth inductor L12 mainly suppresses second-order harmonics.
The second low-pass matching network 322 includes a thirteenth inductor L13, an eighteenth capacitor C18, and a fourteenth inductor L14. A series resonant circuit (Trap) formed by the eighteenth capacitor C18 and the fourteenth inductor L14 mainly suppresses the second harmonic.
The third low-pass matching network 323 includes a fifteenth inductor L15, a nineteenth capacitor C19, and a sixteenth inductor L16. The series resonant circuit (Trap) formed by the nineteenth capacitor C19 and the sixteenth inductor L16 mainly suppresses third-order harmonics.
The band-stop matching network 324 includes a twentieth capacitor C20 and a seventeenth inductor L17. The twentieth capacitor C20 and the seventeenth inductor L17 form a parallel resonant circuit (Tank) that mainly suppresses third-order harmonics.
The circuit connection relationship of the output matching circuit 32 is:
a first end of the eleventh inductor L11 serves as an input end of the output matching circuit 32.
A second end of the eleventh inductor L11 is connected to a first end of the seventeenth capacitor C17 and a first end of the thirteenth inductor L13, respectively. A second end of the seventeenth capacitor C17 is connected to the first end of the twelfth inductor L12. A second end of the twelfth inductor L12 is grounded to GND.
A second end of the thirteenth inductor L13 is connected to the first end of the eighteenth capacitor C18 and the first end of the fifteenth inductor L15, respectively. A second end of the eighteenth capacitor C18 is connected to the first end of the fourteenth inductor L14. A second terminal of the fourteenth inductor L14 is connected to the ground GND.
A second end of the fifteenth inductor L15 is connected to the first end of the nineteenth capacitor C19, the first end of the twentieth capacitor C20, and the first end of the seventeenth inductor L17, respectively. A second end of the nineteenth capacitor C19 is connected to a first end of the sixteenth inductor L16. A second end of the sixteenth inductor L16 is connected to the ground GND.
A second terminal of the twentieth capacitor C20 serves as an input terminal of the output matching circuit 32, and a second terminal of the twentieth capacitor C20 is connected to a second terminal of the seventeenth inductor L17.
In this embodiment, the inductor implementation form adopted in the substrate output unit 3 may be an SMT form, a wound inductor form, or an IPD form. The capacitance implementation form adopted in the substrate output unit 3 may be an SMT form or an IPD form.
In this embodiment, the rf power amplifier 100 is simulated to verify that the operating bandwidth of the rf power amplifier 100 is high. Referring to fig. 4, fig. 4 is a graph illustrating a relationship between gain and frequency of the rf power amplifier 100 according to the embodiment of the invention. The curve S (1, 1) is an input power curve of the rf power amplifier 100, and the curve S (2, 1) is an output power curve of the rf power amplifier 100. Wherein the frequency of the frequency point m7 is 1.616GHz, and the gain dB (S (2, 1)) of the frequency point m7 is 32.567; the frequency at frequency point m8 is 3.232GHz, and the gain dB (S (2, 1)) at frequency point m8 is-60.725; the frequency at frequency point m16 is 4.848GHz, and the gain dB (S (2, 1)) at frequency point m16 is-100.900; as can be seen from the gain and frequency comparison of the different frequency points m7, m8 and m16 on the graph, the rf power amplifier 100 of the present invention has a high operating bandwidth.
In this embodiment, the saturation power of the rf power amplifier 100 is verified to be high by performing simulation on the rf power amplifier 100. Referring to fig. 5, fig. 5 is a graph illustrating a relationship between a gain and an output power of the rf power amplifier 100 according to the embodiment of the invention. As can be seen, the saturation power of the rf power amplifier 100 of the present invention is high.
The embodiment of the invention provides a radio frequency module, which comprises a substrate and the radio frequency power amplifier 100 welded on the substrate.
In this embodiment, the power amplifier unit 2 is a semiconductor chip. The substrate input unit 1 and the substrate output unit 3 are both made of a plurality of discrete components.
The radio frequency module provided in the embodiment of the present invention can implement various implementation manners in the embodiment of the radio frequency power amplifier 100, and has corresponding beneficial effects, and in order to avoid repetition, details are not repeated here.
It should be noted that the related circuits, transformers, capacitors, inductors, and power amplifiers used in the present invention are all commonly used circuits and components in the field, and the corresponding specific indexes and parameters are adjusted according to the actual application, and are not described in detail herein.
Compared with the prior art, the radio frequency power amplifier and the radio frequency module of the invention have the advantages that the power amplifier unit is internally provided with the first inter-stage matching network and the second inter-stage matching network. The first inter-stage matching network comprises a seventh inductor, a fifth capacitor, a fifth inductor and a seventh capacitor; the second inter-stage matching network comprises an eighth inductor, a sixth capacitor, a sixth inductor and an eighth capacitor; the first inter-stage matching network and the second inter-stage matching network improve the frequency bandwidth of the matching network, and further improve the working bandwidth of the radio-frequency power amplifier, so that the working bandwidth of the radio-frequency power amplifier is high. Preferably, the radio frequency power amplifier of the invention is provided with a substrate input unit and a substrate output unit respectively in front of and behind the power amplifier unit, wherein the balun of the substrate input unit and the transformer of the substrate output unit form the realized differential power amplifier, and the differential structure can also realize the function of strengthening and inhibiting the dual harmonic. The series resonance network of the substrate output unit suppresses harmonic waves of more than four orders; the output matching circuit of the substrate output unit realizes suppression of second-order harmonic waves and third-order harmonic waves. Therefore, the radio frequency power amplifier and the radio frequency module have good harmonic suppression effect when the output power is high.
It should be noted that the above-mentioned embodiments described with reference to the drawings are only intended to illustrate the present invention and not to limit the scope of the present invention, and it should be understood by those skilled in the art that modifications and equivalent substitutions can be made without departing from the spirit and scope of the present invention. Furthermore, unless the context indicates otherwise, words that appear in the singular include the plural and vice versa. Additionally, all or a portion of any embodiment may be utilized with all or a portion of any other embodiment, unless stated otherwise.
Claims (10)
1. A radio frequency power amplifier is characterized by comprising a substrate input unit, a power amplifier unit and a substrate output unit which are sequentially connected;
the substrate input unit is used for receiving an external single-ended signal and converting the external single-ended signal into two paths of first signals with the same power and 180-degree phase difference;
the power amplifier unit is used for amplifying the power of the two paths of first signals and then generating two paths of second signals;
the substrate output unit is used for receiving the two paths of second signals, then carrying out power synthesis to convert the two paths of second signals into one path of third signals, and outputting the third signals after suppressing the harmonic waves of the third signals;
the power amplifier unit comprises a first input radio frequency matching network, a first driving stage power amplifier, a first inter-stage matching network, a first amplification stage power amplifier, a second input radio frequency matching network, a second driving stage power amplifier, a second inter-stage matching network, a second amplification stage power amplifier, a twelfth capacitor, a thirteenth capacitor and a ninth capacitor; the first input radio frequency matching network comprises a third capacitor and a third inductor; the first inter-stage matching network comprises a seventh inductor, a fifth capacitor, a fifth inductor and a seventh capacitor; the second input radio frequency matching network comprises a fourth capacitor and a fourth inductor; the second inter-stage matching network comprises an eighth inductor, a sixth capacitor, a sixth inductor and an eighth capacitor;
a first end of the third capacitor is used as a first input end of the power amplifier unit, the first end of the third capacitor is connected to a first end of the third inductor, and a second end of the third inductor is grounded;
a second end of the third capacitor is connected to the input end of the first driving stage power amplifier;
an output end of the first driver stage power amplifier is connected to a second end of the seventh inductor and a first end of the fifth capacitor respectively;
a first end of the seventh inductor is connected to a first power voltage, a first end of the eighth inductor, a first end of the twelfth capacitor, and a first end of the thirteenth capacitor, respectively, a second end of the twelfth capacitor is grounded, and a second end of the thirteenth capacitor is grounded;
a second end of the fifth capacitor is connected to a first end of the fifth inductor and a first end of the seventh capacitor, respectively, and a second end of the fifth inductor is grounded;
a second end of the seventh capacitor is connected to the input end of the first amplification stage power amplifier;
the output end of the first amplification stage power amplifier is used as the first output end of the power amplifier unit, and the output end of the first amplification stage power amplifier is connected to the first end of the ninth capacitor;
a first end of the fourth capacitor is used as a second input end of the power amplifier unit, the first end of the fourth capacitor is connected to a first end of the fourth inductor, and a second end of the fourth inductor is grounded;
a second end of the fourth capacitor is connected to the input end of the second driving stage power amplifier;
the output end of the second driving stage power amplifier is respectively connected to the second end of the eighth inductor and the first end of the sixth capacitor;
a second end of the sixth capacitor is connected to the first end of the sixth inductor and the first end of the eighth capacitor, respectively, and a second end of the sixth inductor is grounded;
a second end of the eighth capacitor is connected to the input end of the second amplification stage power amplifier;
the output end of the second amplifier stage power amplifier is used as the second output end of the power amplifier unit, and the output end of the second amplifier stage power amplifier is connected to the second end of the ninth capacitor.
2. The radio frequency power amplifier of claim 1, wherein the substrate input unit is an LC lumped balun.
3. The radio frequency power amplifier of claim 2, wherein the substrate input unit comprises a first capacitor, a second capacitor, a first inductor, and a second inductor;
the first end of the first capacitor is used as the input end of the substrate input unit, and the first end of the first capacitor is connected to the first end of the second inductor;
the second end of the first capacitor is used as the first output end of the substrate input unit, the second end of the first capacitor is connected to the first end of the first inductor, and the second end of the first inductor is grounded;
the second end of the second inductor is used as the second output end of the substrate input unit, the second end of the second inductor is connected to the first end of the second capacitor, and the second end of the second capacitor is grounded.
4. The radio frequency power amplifier of claim 1, wherein the substrate output unit comprises a transformer, a tenth capacitor, an eleventh capacitor, a fourteenth capacitor, a series resonant network, and an output matching circuit;
the series resonance network is used for suppressing harmonic waves of more than four orders;
the output matching circuit is used for matching output impedance;
a first end of a primary coil of the transformer is used as a first input end of the substrate output unit; a second end of the primary coil of the transformer is used as a second input end of the substrate output unit;
a central tap end of a primary coil of the transformer is connected to a first end of the tenth capacitor, a first end of the fourteenth capacitor and a second power supply voltage, a second end of the tenth capacitor is grounded, and a second end of the fourteenth capacitor is grounded;
the first end of the secondary coil of the transformer is respectively connected with the interface end of the series resonant network and the input end of the output matching circuit;
a second end of the secondary coil of the transformer is connected to a first end of the eleventh capacitor, and a second end of the eleventh capacitor is grounded;
and the output end of the output matching circuit is used as the output end of the substrate output unit.
5. The radio frequency power amplifier of claim 4, wherein the series resonant network comprises a fifteenth capacitance, a sixteenth capacitance, a ninth inductance, and a tenth inductance;
a first end of the fifteenth capacitor serves as an interface end of the series resonant network, and the first end of the fifteenth capacitor is connected to the first end of the sixteenth capacitor;
a second end of the fifteenth capacitor is connected to a first end of the ninth inductor, and a second end of the ninth inductor is grounded;
a second end of the sixteenth capacitor is connected to the first end of the tenth inductor, and a second end of the tenth inductor is grounded.
6. The radio frequency power amplifier of claim 4, wherein the output matching circuit comprises a first low-pass matching network, a second low-pass matching network, a third low-pass matching network, and a band-stop matching network connected in sequence.
7. The radio frequency power amplifier of claim 6, wherein the first low pass matching network comprises an eleventh inductor, a seventeenth capacitor, a twelfth inductor;
the second low-pass matching network comprises a thirteenth inductor, an eighteenth capacitor and a fourteenth inductor;
the third low-pass matching network comprises a fifteenth inductor, a nineteenth capacitor and a sixteenth inductor;
the band-stop matching network comprises a twentieth capacitor and a seventeenth inductor;
a first end of the eleventh inductor is used as an input end of the output matching circuit;
a second end of the eleventh inductor is connected to a first end of the seventeenth capacitor and a first end of the thirteenth inductor, respectively; a second end of the seventeenth capacitor is connected to a first end of the twelfth inductor, and a second end of the twelfth inductor is grounded;
a second end of the thirteenth inductor is connected to a first end of the eighteenth capacitor and a first end of the fifteenth inductor respectively; a second end of the eighteenth capacitor is connected to a first end of the fourteenth inductor, and a second end of the fourteenth inductor is grounded;
a second end of the fifteenth inductor is connected to the first end of the nineteenth capacitor, the first end of the twentieth capacitor and the first end of the seventeenth inductor, respectively; a second end of the nineteenth capacitor is connected to a first end of the sixteenth inductor, and a second end of the sixteenth inductor is grounded;
a second terminal of the twentieth capacitor is used as an input terminal of the output matching circuit, and the second terminal of the twentieth capacitor is connected to the second terminal of the seventeenth inductor.
8. The radio frequency power amplifier of claim 1, wherein the third, fourth, fifth, sixth, seventh, eighth, and ninth capacitors are each a STACK capacitor or a MIM capacitor.
9. A radio frequency module, comprising a substrate and the radio frequency power amplifier of any one of claims 1-8 soldered to the substrate.
10. The rf module of claim 9, wherein the power amplifier unit is a semiconductor chip; the substrate input unit and the substrate output unit are both made of a plurality of discrete components.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211616429.4A CN115882796A (en) | 2022-12-13 | 2022-12-13 | Radio frequency power amplifier and radio frequency module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211616429.4A CN115882796A (en) | 2022-12-13 | 2022-12-13 | Radio frequency power amplifier and radio frequency module |
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| Publication Number | Publication Date |
|---|---|
| CN115882796A true CN115882796A (en) | 2023-03-31 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202211616429.4A Pending CN115882796A (en) | 2022-12-13 | 2022-12-13 | Radio frequency power amplifier and radio frequency module |
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| Country | Link |
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| CN (1) | CN115882796A (en) |
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