CN219960538U - Power amplifier and wireless transmitter - Google Patents
Power amplifier and wireless transmitter Download PDFInfo
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- CN219960538U CN219960538U CN202321157380.0U CN202321157380U CN219960538U CN 219960538 U CN219960538 U CN 219960538U CN 202321157380 U CN202321157380 U CN 202321157380U CN 219960538 U CN219960538 U CN 219960538U
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Abstract
The utility model discloses a power amplifier and a wireless transmitter, wherein the power amplifier comprises a power device and a matching network, the output end of the power device is connected with the input end of the matching network, the input end of the matching network comprises two input ports and a matching capacitor; the matching capacitor is connected in series with the matching network, so that the impedance difference of the two input ports of the matching network is within a preset range; the matching capacitor is connected in series on the matching network, so that the impedance difference of two input ports of the matching network is within a preset range, and the two input ports of the input end of the matching network can obtain consistent impedance, thereby maximizing the output power of the power amplifier and realizing the real matching between the power amplifier and the antenna.
Description
The present utility model claims priority from the national intellectual property agency, application No. 202320763766.X, chinese patent application entitled "a power amplifier and wireless transmitter," filed 28 at 2023, 03, the entire contents of which are incorporated herein by reference.
Technical Field
The present utility model relates to the field of amplifiers, and more particularly, to a power amplifier and a wireless transmitter.
Background
The existing rf power amplifier is usually in a differential structure, and the antenna is usually in a single-ended structure, so that a matching network needs to be connected between the rf power amplifier and the antenna to realize matching between the rf power amplifier and the antenna, so that the rf power amplifier in the differential structure can output maximum power to the antenna.
However, since there are two ports on the output side of the matching network, one port is connected to the antenna, the other port is grounded, and there is an undesirable effect on the ground, which affects the power output from the rf power amplifier to the antenna, and cannot maximize the output power of the rf power amplifier.
Disclosure of Invention
The technical problems to be solved by the utility model are as follows: provided are a power amplifier and a wireless transmitter capable of improving the output power of the power amplifier.
In order to solve the technical problems, the utility model adopts a technical scheme that:
the power amplifier comprises a power device and a matching network, wherein the output end of the power device is connected with the input end of the matching network, and the input end of the matching network comprises two input ports and a matching capacitor;
the matching capacitor is connected in series with the matching network, so that the impedance difference of the two input ports of the matching network is within a preset range.
In order to solve the technical problems, the utility model adopts another technical scheme that:
a wireless transmitter comprises the power amplifier
The utility model has the beneficial effects that: the matching network is connected with the matching capacitor in series, so that the impedance difference of two input ports of the matching network is within a preset range, and the two input ports of the input end of the matching network can obtain consistent impedance, thereby maximizing the output power of the power amplifier and realizing the real matching between the power amplifier and the antenna; by innovatively finding that the non-ideal effect exists at the grounding end of the matching network, the two input ports of the input end of the matching network can see non-uniform impedance, so that the power amplifier cannot output maximum power, and the matching network is connected with the matching capacitor in series, so that the two input ports of the input end of the matching network can see uniform impedance, and the output power of the power amplifier is greatly improved.
Drawings
Fig. 1 is a circuit configuration diagram of a power amplifier according to an embodiment of the present utility model;
fig. 2 is a circuit configuration diagram of a wireless transmitter according to an embodiment of the present utility model;
FIG. 3 is a circuit diagram illustrating one implementation of a matching network in a power amplifier according to an embodiment of the present utility model;
FIG. 4 is an equivalent circuit diagram of one implementation of a power amplifier according to an embodiment of the present utility model;
FIG. 5 is a circuit block diagram of another implementation of a power amplifier according to an embodiment of the utility model;
FIG. 6 is an equivalent circuit diagram of another implementation of a power amplifier according to an embodiment of the present utility model;
FIG. 7 is a circuit diagram of another implementation of a power amplifier according to an embodiment of the utility model;
FIG. 8 is a circuit block diagram of another implementation of a power amplifier according to an embodiment of the utility model;
FIG. 9 is a circuit block diagram of another implementation of a power amplifier according to an embodiment of the utility model;
FIG. 10 is a circuit diagram illustrating one implementation of a matching capacitor of a power amplifier according to an embodiment of the present utility model;
FIG. 11 is a graph of simulation results of the impedance observed at the primary side of a transformer in a prior art power amplifier;
fig. 12 is a diagram showing simulation results of the impedance observed by the primary side of the transformer in the power amplifier according to the embodiment of the present utility model.
Detailed Description
In order to describe the technical contents, the achieved objects and effects of the present utility model in detail, the following description will be made with reference to the embodiments in conjunction with the accompanying drawings.
Referring to fig. 1 to 12, a power amplifier includes a power device and a matching network, wherein an output end of the power device is connected with an input end of the matching network, and the input end of the matching network includes two input ports and a matching capacitor;
the matching capacitor is connected in series with the matching network, so that the impedance difference of the two input ports of the matching network is within a preset range.
From the above description, the beneficial effects of the utility model are as follows: the matching network is connected with the matching capacitor in series, so that the impedance difference of two input ports of the matching network is within a preset range, and the two input ports of the input end of the matching network can obtain consistent impedance, thereby maximizing the output power of the power amplifier and realizing the real matching between the power amplifier and the antenna; by innovatively finding that the non-ideal effect exists at the grounding end of the matching network, the two input ports of the input end of the matching network can see non-uniform impedance, so that the power amplifier cannot output maximum power, and the matching network is connected with the matching capacitor in series, so that the two input ports of the input end of the matching network can see uniform impedance, and the output power of the power amplifier is greatly improved.
Further, the matching capacitor comprises a first capacitor and a second capacitor;
the first capacitor and the second capacitor are different in size;
the output end of the matching network comprises two output ports, and the first capacitor and the second capacitor are respectively connected in series with the two output ports.
According to the description, two capacitors with different sizes are respectively connected in series with two output ports of the matching network, inductance is not required to be increased, only two capacitors are required to be output, and the two input ports of the input end of the matching network can conveniently and rapidly see the same impedance under the condition that the area of the matching network is not excessively increased, so that the two-stage voltage and the phase of the power amplifier are the same, and the transmission power is effectively improved.
Further, the output end of the matching network comprises two output ports, one output port is grounded, and the other output port is connected in series with the matching capacitor.
As can be seen from the above description, since the capacitors of the matching network are usually connected in series or in parallel, the impedance of the input end of the matching network cannot be balanced, and the impedance of the input end of the matching network can be balanced to a certain extent by connecting the matching capacitor in series to the non-grounded end of the matching network.
Further, the capacitor also comprises a third capacitor and a fourth capacitor;
the third capacitor and the fourth capacitor are different in size;
the third capacitor and the fourth capacitor are respectively connected in parallel with the two input ports.
As can be seen from the above description, on the basis of connecting the matching capacitor in series with the non-grounding end of the matching network, two capacitors with different sizes are connected in series with the two input ports of the matching network, so that the problem of inconsistent impedance of the input end of the matching network can be better solved.
Further, the first inductor is also included;
the first inductor is connected in series with the matching capacitor.
As can be seen from the above description, based on the fact that the non-grounded end of the matching network is connected in series with the matching capacitor, an inductor is connected in series with the non-grounded end of the matching network, so that the problem of inconsistent impedance of the input end of the matching network can be better solved.
Further, the second inductor is also included;
one end of the second inductor is connected with one end of the matching capacitor, which is close to the matching network, and the other end of the second inductor is grounded.
As can be seen from the above description, based on the non-grounded end of the matching network being connected in series with the matching capacitor, an inductance is connected in parallel between two output ports of the matching network, so as to better solve the problem of inconsistent impedance of the input end of the matching network.
Further, the matching network is balun.
Further, the balun comprises a transformer;
the output end of the power device is connected with the primary side of the transformer;
the matching capacitor is connected in series on the secondary side of the transformer so that the impedance difference between the P end and the N end of the primary side of the transformer is within a preset range.
Further, the matching capacitor is a resonant capacitor.
Further, the resonant capacitor comprises a fifth capacitance and a third inductance;
the fifth capacitor and the third inductor are connected in parallel.
From the above description, it is known that the matching capacitor can be implemented by using a resonant capacitor (LC Resonator) with a capacitor connected in parallel to an inductor, that is, the matching capacitor is implemented by using a capacitive Resonator, so that the flexibility of implementing the matching capacitor is improved, and the application range of the matching capacitor is enlarged.
A wireless transmitter comprises the power amplifier.
The power amplifier and the wireless transmitter can be applied to an application scene of poor matching effect of the matching network due to the non-ideal effect of the grounding end of the matching network, and the following description is given by a specific embodiment:
in an alternative embodiment, as shown in fig. 1, a power amplifier includes a power device and a matching network, an output end of the power device is connected with an input end of the matching network, the input end of the matching network includes two input ports, and the power amplifier further includes a matching capacitor;
the matching capacitor is connected in series with the matching network, so that the impedance difference of the two input ports of the matching network is within a preset range;
the method comprises the steps that a preset range can be flexibly set according to a specific application scene, for example, the preset range can be set to be 5 ohms, after a matching capacitor is connected to a matching network in series, impedance values seen by two ports at the input end of the matching network can be calculated, the magnitude of the series matching capacitor is adjusted by comparing the difference value of the impedance values seen by the two ports, and if the difference value is within 5 ohms, the fact that the impedance values seen by the two ports at the input end of the matching network are consistent is indicated;
in another alternative embodiment, the respective preset ranges of the reactance and the resistance may be set separately, and then the size of the series matching capacitor is adjusted until the difference between the resistances and the difference between the reactance are within the preset ranges.
As shown in fig. 2, the circuit structure diagram of the wireless transmitter includes an input matching network, a power device, an output matching network and an antenna which are sequentially connected, wherein the input matching network, the power device and the output matching network form a power amplifier, the power device can be a differential amplifier, and an output end of the power amplifier is connected with the antenna in the wireless transmitter. The output matching network acts to harmonize the impedance between the power amplifier and the antenna to maximize the power transferred by the power amplifier to the antenna;
because the antenna is of a single-ended structure, the output matching network needs to convert the differential signal output by the radio frequency power amplifier into a single-ended signal, so the output matching network has two functions: one is to reconcile the impedance between the power amplifier and the antenna, and the other is to convert the differential signal of the power amplifier to a single-ended signal;
in an alternative embodiment, balun (Balun) may be used as a matching network to match the power amplifier and antenna;
specifically, the matching network may include a transformer, and an output end of the power device is connected with a primary side of the transformer;
the matching capacitor is connected in series on the secondary side of the transformer so that the impedance difference between the P end and the N end of the primary side of the transformer is within a preset range.
The series connection of the matching capacitor and the matching network can be realized in various ways:
in an alternative embodiment, as shown in FIG. 3, the matching capacitor includes a first capacitor C LP And a second capacitor C LN ；
The first capacitor C LP And a second capacitor C LN Is different in size;
the output end of the matching network comprises two output ports, the first capacitor and the second capacitor are respectively connected in series with the two output ports, and specifically, one output port is connected with the second capacitor C LN The other output port is connected with the first capacitor C LP Then is connected with an antenna;
FIG. 4 is an equivalent circuit diagram of the circuit shown in FIG. 3, wherein the RF transformer can be equivalently an ideal transformer (Ideal transformer), primary-side leakage inductance (L p ) Leakage inductance (L) of Secondary side s ) Exciting inductance (L) m ) And parasitic capacitance (Parasitic Capacitor, C p 、C s And C c ) R in FIG. 4 L The non-ideal effect of the grounding end is equivalent to an inductance L GND The method comprises the steps of carrying out a first treatment on the surface of the Because one end of the secondary side of the transformer is grounded, the primary sideThe P-terminal and the N-terminal of (a) see inconsistent impedance, thereby leading to that the differential power amplifier cannot output maximum power;
in the present embodiment, two capacitors C having different magnitudes are connected in series to the secondary side of the transformer LP And C LN The P end and the N end of the primary side of the transformer can see the same impedance, so that the two-stage voltage and the phase of the differential power amplifier are the same, and the effective transmission of power is realized.
In another alternative embodiment, as shown in fig. 5, the output end of the matching network includes two output ports, where one output port is grounded, and the other output port is connected in series with the matching capacitor, that is, the matching capacitor, and is connected in series with the end of the secondary side of the transformer, which is not grounded, and fig. 6 is an equivalent circuit diagram of the circuit shown in fig. 5.
On the basis of the circuit structure shown in fig. 5, in order to further improve the matching degree between the power amplifier and the antenna, the problem that inconsistent impedance is seen by the P end and the N end of the primary side of the transformer is better solved, and the following improvement can be performed:
in a first implementation, as shown in fig. 7, a third capacitor C is further included pp And a fourth capacitor C pn ；
The third capacitor C pp And a fourth capacitor C pn Is different in size;
the third capacitor C pp And a fourth capacitor C pn Respectively connected in parallel with the two input ports, namely a third capacitor C pp One end is connected with the P port of the primary side of the transformer, the other end is grounded, and a third capacitor C pn One end is connected with the N port of the primary side of the transformer, and the other end is grounded.
In a second implementation, as shown in fig. 8, the inductor further includes a first inductor, where the inductor is a series inductor;
the first inductor is connected in series with the matching capacitor, namely, the non-grounding end of the secondary side of the transformer is connected with one end of the first inductor, and the other end of the first inductor is connected with one end, close to the transformer, of the matching capacitor.
In a third implementation manner, the inductor further comprises a second inductor, wherein the inductor is a parallel inductor;
one end of the second inductor is connected with one end of the matching capacitor, which is close to the matching network, and the other end of the second inductor is grounded.
In another alternative embodiment, as shown in fig. 10, the matching capacitor may be a resonant capacitor;
specifically, the resonant capacitor includes a fifth capacitance C1 and a third inductance L1;
the fifth capacitor C1 and the third inductor L1 are connected in parallel, wherein:
C LN or C LP ＝(ω 2 L 1 C 1 -1)/ω 2 L 1
That is, in this embodiment, an LC resonator with an inductance is connected in parallel through a capacitor, and the LC resonator is made to appear capacitive to realize a matching capacitance.
Fig. 11 and 12 are graphs showing simulation results of a conventional power amplifier without a connection matching capacitor and a conventional power amplifier with a connection matching capacitor according to the present utility model, respectively:
FIG. 11 is a simulation result of input impedance seen from the P-terminal and the N-terminal of the transformer when the matching capacitor is not connected (the left graph is the real part, the right graph is the imaginary part), in the left graph, the upper curve is the resistance value measured at the P-terminal, the input resistance at the P-terminal is 364.5 ohms, the lower curve is the resistance value measured at the N-terminal, and the input resistance at the N-terminal is 233.4 ohms; in the right graph, the upper curve is the reactance value measured at the P end, the input reactance at the P end is 26.3 ohms, the lower curve is the reactance value measured at the N end, and the input reactance at the N end is 18.4 ohms; so that the input differential mode resistance difference is up to 131.1 ohms and the input differential mode reactance difference is up to 7.9 ohms;
in fig. 12, the simulation results of the input impedance seen from the P-terminal and the N-terminal of the transformer when the matching capacitor is connected (the left graph is the real part, the right graph is the imaginary part), in the left graph, the upper curve is the resistance value measured at the P-terminal, the input resistance at the P-terminal is 302.3 ohms, the lower curve is the resistance value measured at the N-terminal, and the input resistance at the N-terminal is 299.3 ohms; in the right graph, the upper curve is the reactance value measured at the P end, the input reactance at the P end is 19 ohms, the lower curve is the reactance value measured at the N end, and the input reactance at the N end is 17.4 ohms; therefore, the input differential mode resistance difference is only 3 ohms, and the input differential mode reactance difference is only 1.6 ohms;
through the simulation comparison, the consistency of the impedance seen by the P end and the N end of the primary side of the transformer is ensured through the addition of the matching capacitor, so that the influence of the non-ideal effect of the grounding end of the matching network on the matching network power matching is solved, and the output power of the power amplifier is greatly improved.
In another alternative embodiment, a wireless transmitter, the power amplifier of any of the various embodiments above.
In summary, according to the power amplifier and the wireless transmitter provided by the utility model, the matching capacitor is connected in series on the matching network, so that the impedance difference between the two input ports of the matching network is within the preset range, and thus, the two input ports of the input end of the matching network can obtain consistent impedance, and the power output by the power amplifier can be maximized, so that the real matching between the power amplifier and the antenna is realized; the matching capacitors can be connected in series on the matching network in different modes, the series modes are various and flexible, the non-ideal effect of the grounding end of the matching network is found innovatively to cause that the two input ports of the input end of the matching network see non-uniform impedance, so that the power amplifier cannot output maximum power, and the matching capacitors are connected in series on the matching network, so that the two input ports of the input end of the matching network see uniform impedance, and the output power of the power amplifier is greatly improved.
The foregoing description is only illustrative of the present utility model and is not intended to limit the scope of the utility model, and all equivalent changes made by the specification and drawings of the present utility model, or direct or indirect application in the relevant art, are included in the scope of the present utility model.
Claims (11)
1. The power amplifier comprises a power device and a matching network, wherein the output end of the power device is connected with the input end of the matching network, and the input end of the matching network comprises two input ports;
the matching capacitor is connected in series with the matching network, so that the impedance difference of the two input ports of the matching network is within a preset range.
2. A power amplifier according to claim 1, wherein the matching capacitance comprises a first capacitance and a second capacitance;
the first capacitor and the second capacitor are different in size;
the output end of the matching network comprises two output ports, and the first capacitor and the second capacitor are respectively connected in series with the two output ports.
3. A power amplifier according to claim 1, wherein the output of the matching network comprises two output ports, one of which is connected to ground and the other of which is connected in series with the matching capacitor.
4. A power amplifier according to claim 3, further comprising a third capacitor and a fourth capacitor;
the third capacitor and the fourth capacitor are different in size;
the third capacitor and the fourth capacitor are respectively connected in parallel with the two input ports.
5. A power amplifier according to claim 3, further comprising a first inductor;
the first inductor is connected in series with the matching capacitor.
6. A power amplifier according to claim 3, further comprising a second inductor;
one end of the second inductor is connected with one end of the matching capacitor, which is close to the matching network, and the other end of the second inductor is grounded.
7. A power amplifier according to any one of claims 1 to 6, wherein the matching network is balun.
8. A power amplifier according to claim 7, wherein the balun comprises a transformer;
the output end of the power device is connected with the primary side of the transformer;
the matching capacitor is connected in series on the secondary side of the transformer so that the impedance difference between the P end and the N end of the primary side of the transformer is within a preset range.
9. A power amplifier according to any one of claims 1 to 6, wherein the matching capacitance is a resonant capacitor.
10. A power amplifier according to claim 9, wherein the resonant capacitor comprises a fifth capacitance and a third inductance;
the fifth capacitor and the third inductor are connected in parallel.
11. A wireless transmitter comprising a power amplifier as claimed in any one of claims 1 to 10.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320763766X | 2023-03-28 | ||
| CN202320763766 | 2023-03-28 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219960538U true CN219960538U (en) | 2023-11-03 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321157380.0U Active CN219960538U (en) | 2023-03-28 | 2023-05-15 | Power amplifier and wireless transmitter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219960538U (en) |
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2023
- 2023-05-15 CN CN202321157380.0U patent/CN219960538U/en active Active
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