CN1131588C - Power amplifier - Google Patents
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- CN1131588C CN1131588C CN 00102379 CN00102379A CN1131588C CN 1131588 C CN1131588 C CN 1131588C CN 00102379 CN00102379 CN 00102379 CN 00102379 A CN00102379 A CN 00102379A CN 1131588 C CN1131588 C CN 1131588C
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Abstract
The present invention relates to a microwave power amplifier utilizing a balanced amplifier. The present invention uses an output port of a combined power synthesizer as a distorted port of a detection amplifier circuit. In order to eliminate noise overlapped on normal signals, the detected distortion is fed back to the amplified normal signals through a regulating circuit and a directional coupler. The present invention is favorable for the miniaturization and the high performance of communication systems.
Description
Technical field
The present invention relates to a kind of power amplifier, particularly relate to a kind of microwave power amplifier with compensating non-linear distortion function.
Background technology
In the last few years, and the research and development of littler lighter cellular phone were coordinated mutually, and reduced the IC supply voltage and needed further low power consumption.Along with the reduction of IC supply voltage, the transistor of forming power amplifier becomes easier to be saturated.Therefore, being superimposed upon the value of the noise on amplified output signal certainly will will increase.
Yet,,, also must guarantee to utilize the optimal communication of cellular phone even under the situation of low power consumption in order to satisfy user's strict demand.
Guarantee communication quality, importantly compensate the nonlinear distortion of microwave power amplifier.In the HEI6-37551 Japanese patent application, introduced a kind of nonlinear distortion compensation circuit of power amplifier.
The nonlinear distortion that suppresses microwave power amplifier at first needs to extract distorted signal components.Then, the phase place of the distorted signal components extracted is anti-phase.Again anti-phase signal is superimposed upon on the original signal, so that offset distortion component.
Yet only isolating distortion component in the output signal by power amplifier needs special distortion to extract circuit, and this will need more circuit part.This just may increase the cost of device.
This also requires regulating accurately in advance the circuit part that is increased.This adjusting is pretty troublesome.
Summary of the invention
The objective of the invention is to reduce the adjusting in advance that the distortion of microwave power amplifier suppresses the increase of circuit block quantity simultaneously and avoids circuit.
The present invention utilizes a kind of balance amplifier, and it comprises hybrid power divider and the combined power synthesizer that is used for power amplification.The present invention effectively utilizes (terminated) port (end) of a common termination of combined power synthesizer as a distortion detection port (end).
That is, in the balance amplifier circuit, be used for the resistance termination that output port beyond the output port of normal signal utilized termination originally routinely.Yet these ports are characterised in that, it is not many as normal signal is suppressed that the distortion component that produces in amplifier outputs to these ports.
Find that based on this can not adopt any special circuit but utilize one of them port of combined power synthesizer to extract distortion, this port was a termination as a distortion detection port routinely originally.Required adjusting is carried out in output to this port, and this output is fed back to the power amplifier output, just can offset distortion component, therefore eliminates distortion component.
Hope is to being regulated by decay, phase shift or the amplitude of the signal level of the distorted signal of port output of combined power synthesizer.This will strengthen distortion and eliminate effect.
Power amplifier circuit provided by the invention comprises: hybrid power divider, and it comprises provides the first input end of input signal mouth, be connected with second input port and first and second output ports of terminating resistor; The combined power synthesizer, second output port that it comprises first and second input ports, is used as first output port of distortion detection port and is used as the normal signal output port; First amplifier circuit, it is connected between the described first input end mouth of described first output port of described hybrid power divider and described combined power synthesizer; And second amplifier circuit, it is connected between described second input port of described second output port of described hybrid power divider and described combined power synthesizer, this power amplifier circuit also is equipped with compensating circuit, described compensating circuit comprises: regulating circuit, it comprises variable attenuator, phase shifter and amplifier circuit, is used to regulate from the level and the phase place of the distorted signal of described first output port output of described combined power synthesizer; And feedback circuit, its output with described regulating circuit feeds back to the normal signal by described second output port output of described combined power synthesizer.
Power amplifier circuit of the present invention can be included in transmitter or the acceptor circuit.
In mobile communications device, install power amplifier of the present invention can guarantee clear, distortion is less, the high communication quality that has.
Description of drawings
Will will understand above and other objects of the present invention and characteristics more fully according to the following introduction of hereinafter being done in conjunction with the accompanying drawings, represent an example in the accompanying drawings by way of example, wherein:
Fig. 1 is the circuit diagram of expression combined balance system power amplifier structure according to an embodiment of the invention;
Fig. 2 A is the signal spectrum schematic diagram of signal transmission path in 1. in the power amplifier shown in the presentation graphs 1;
Fig. 2 B is the signal spectrum schematic diagram of signal transmission path in 2. in the power amplifier shown in the presentation graphs 1;
Fig. 2 C is the signal spectrum schematic diagram of signal transmission path in 3. in the power amplifier shown in the presentation graphs 1;
Fig. 2 D is the signal spectrum schematic diagram of signal transmission path in 4. in the power amplifier shown in the presentation graphs 1;
Fig. 3 A is the schematic diagram of a general structure of combined balance system power amplifier of expression;
Fig. 3 B is the equivalent circuit schematic diagram of the general combined balance system power amplifier of expression;
Fig. 4 is a circuit diagram of representing transmitter architecture according to another embodiment of the invention;
Fig. 5 is a circuit diagram of representing receiver architecture according to still a further embodiment;
Fig. 6 is the circuit diagram of expression as the structure of the combined balance system power amplifier of a comparative example;
Fig. 7 A is the schematic diagram of the signal spectrum of signal transmission path in 1. in the combined balance system power amplifier shown in the presentation graphs 6;
Fig. 7 B is the schematic diagram of the signal spectrum of signal transmission path in 2. in the combined balance system power amplifier shown in the presentation graphs 6;
Fig. 7 C is the schematic diagram of the signal spectrum of signal transmission path in 3. in the combined balance system power amplifier shown in the presentation graphs 6;
Fig. 7 D is the schematic diagram of the signal spectrum of signal transmission path in 4. in the combined balance system power amplifier shown in the presentation graphs 6; And
Fig. 8 is for explaining the characteristic schematic diagram of the nonlinear distortion in the power amplifier circuit.
Embodiment
Explain various embodiments of the present invention with reference to the accompanying drawings.
Before each embodiment is explained, utilize Fig. 3 A and 3B to explain the structure and the typical operation method (conventional operation method) of balance amplifier.
Fig. 3 A is the schematic diagram of a balance amplifier basic structure of expression; Fig. 3 B is the equivalent circuit schematic diagram of expression balance amplifier.
As shown in Fig. 3 B, the signal IN that balance amplifier will be input to input 20a is divided into two parts by power divider 22 and is amplified by two amplifier circuits 23 and 24 signals with these two distribution, synthetic through amplifying signal by power combiner 25 then with two, obtain amplified output signal OUT by output 27b.
According to this configuration, the signal of input is divided into two parts, and the power of signal is reduced to 1/2, therefore, compare with the amplification example that utilizes an amplifier, the load reduction on each amplifier circuit 23,24.
That is, transistor is unlikely to be become saturatedly, therefore, is easy to guarantee the linearity.In addition, because the reduction of the load on an amplifier, even an advantage of this structure is to utilize cheap circuit also can obtain required performance.
Or rather, the structure of balance amplifier is as shown in Fig. 3 A.Power divider 22 and power combiner 25 all are one to have the mixed structure of two inputs and two outputs.
Here, mixed structure is meant and has the structure that is used for that input signal is divided into 2 signals or 2 signals is synthesized 4 ends (port) of a signal.
In Fig. 3 A, input signal IN is input to an input port 20a in the hybrid power divider 22.The terminal resistance R1 of one 50 Ω is connected to another input port 21a in the power divider 22, so that regulate impedance.
The input signal IN that is input to this input port 20a is divided into two parts.Binary signal through distributing is exported by output port 20b and 21b through two paths " A " and " B " respectively.
At this moment, identical with the phase place of input signal IN through path " A " by the phase place of the signal of output port 20b output, and compare 90 ° of the phase-shifteds of input signal IN by the phase place of the signal of output port 21b output through path " B ".
Amplify by amplifier circuit 23 and 24 respectively by the output port 20b of power divider 22 and the signal of output port 21b output.The output of amplifier is input to the input port 26a and the 27a of combined power synthesizer 25 again.
Combined power synthesizer 25 with the signal of two inputs synthetic and by output output through amplifying signal (normal signal OUT).50 Ω terminal resistance R2 are connected to another output port 26b.Therefore, can't help this output port 26b output normal signal.
That is, utilize combined power synthesizer 25, the signal that is input to input port 26a is assigned to two output port 26b and 27b through path " C " and " E ".
Similarly, the signal that is input to input port 27a is assigned to two output port 26b and 27b through path " D " and " F ".
At this moment, through the phase place of signal of path " C " and " D " output by 90 ° of phase of input signals displacements.On the other hand, identical with phase of input signals through path " E " with the phase place of the signal of " F " output.
Here, for output port 26b, be the composite signal of the signal that arrives of the path " E " of path " A ", amplifier circuit 23 and power combiner 25 in overpower distributor 22 and the signal that arrives through the path " D " of path " B ", amplifier circuit 24 and power combiner 25 in the power divider 22 at the signal that this port occurs.
Through the path " A " in the power divider 22 signal that arrives and the signal that arrives through the path " D " in amplifier 24 and the power combiner 25 is the signal that adds up to 180 ° (90 °+90 °) with respect to input signal IN phase shift.On the other hand, the signal that arrives through the path " E " in the power combiner 25 is and the identical signal of input signal IN phase place.
That is, because a signal and another are had the signal plus of 180 ° of phase shifts with respect to first signal, these two signals are cancelled, and therefore can't help output port 26b output normal signal.
On the other hand, for the output port 27b of power combiner 25, be the composite signal of the signal that arrives of the path " F " of path " B ", amplifier circuit 24 and power combiner 25 in overpower distributor 22 and the signal that arrives through the path " C " of path " A ", amplifier circuit 23 and power combiner 25 in the power divider 22 at the signal that this port occurs.
Here, the signal that arrives through the path " F " in path " B ", amplifier 24 and the power combiner 25 in the power divider 22 is to be 90 ° signal with respect to input signal IN phase shift.On the other hand, the signal that arrives through the path " C " in path " A ", amplifier 23 and the power combiner 25 in the power divider 22 is to be 90 ° signal with input signal IN phase shift equally.
That is, will have two signals (two signals that promptly have same phase) addition of 90 ° of phase shifts with respect to input signal IN.Therefore export the normal signal OUT that amplifies by output port 27b.
The groundwork situation of Here it is balance amplifier.
(embodiment 1)
Fig. 1 is that expression is according to the circuit diagram with microwave power amplifier structure of distortion compensation functionality of the present invention.
As shown in FIG., the balance amplifier of power amplifier utilization of the present invention with 2 inputs and 2 outputs amplifies a microwave signal.Yet the working method of the balance amplifier that is adopted is different from the general balance amplifier shown in Fig. 3 A.
That is, at the output port 26b of the original termination of balance amplifier utilization shown in Fig. 1 as a port that detects the distortion that in amplifier circuit 23 and 24, produces.As shown in FIG., regulating circuit 28 is connected to output port 26b.
Regulating circuit 28 comprises level adjustment circuit 29, phase regulating circuit 30 and amplifier circuit 31.The output of regulating circuit 28 feeds back to the normal signal that is obtained by output port 27b through directional coupler 32.So just eliminated the distortion that is superimposed upon on the normal signal.
As mentioned above, present embodiment is characterized in that, the output port 26b of (Fig. 3 A) routinely termination that utilizes power combiner 25 is as the distortion detection port of amplifier circuit 23 and 24.
This point further is explained as follows:
Nonlinear distortion discussed here produces in amplifier circuit 23 and 24.In other words, on the signal path of amplifier circuit 23 and 24, there is not distortion.
Here analyze the output port the 26b how distorted signals that produces is reflected to power combiner 25 in amplifier circuit 23 and 24.
The input port 26a and path " E " arrival output port 26b that pass through power combiner 25 in the distorted signals (noise) of amplifier circuit 23 generations do not produce phase shift.
On the other hand, the distorted signals (noise) that produces at amplifier circuit 24 arrives output port 26b through the input port 27a of power combiner 25 and path " D " and forms 90 ° of phase shifts and synthetic with the signal that arrives through path " E ".These two phase difference between signals are 90 °.
As mentioned above, under the situation of normal signal (main signal), because the function of utilizing balancing circuitry is that 180 ° signal is synthetic with two phase differences, this synthetic signal is suppressed by force, can't help output port 26b output.
Yet, producing under the situation of noise at amplifier circuit 23 and 24, two phase difference between signals synthesizing only are 90 °, noise signal is not many as normal signal (main signal) suppresses.Therefore, only distorted signal components (distorted signal) is exported by output port 26b.
This means, in Fig. 3 A, power combiner 25 had the function of port by the output port 26b of termination routinely as the distorted signal that is used for detecting amplifier circuit 23 and 24.
The present invention has utilized this new discovery, simplifies the structure that this carries out the distortion detection circuit of distortion detection, need not to be provided with any specific structure and saves the time and the trouble of regulating in advance that is used for distortion detection.
More specifically explain structure and working condition below with reference to Fig. 1 according to the Distoriton compensating circuit of present embodiment.
The balance amplifier of the first order shown in Fig. 1 with reference to Fig. 3 in the balance amplifier explained identical.Represent with identical label with the identical part shown in Fig. 3.
Regulating circuit 28 comprises variable attenuator 29, phase shifter 30 and amplifier circuit 31, and this regulating circuit 28 is connected to the output port 26b of the power combiner 25 of this Compositional balance amplifier.Phase shifter 30 is anti-phase with the phase place of distorted signal.
Be provided with this regulating circuit 28 in order to level and the phase place of adjusting by the distorted signal of the output port 26b output of power combiner 25, promptly this port is used for distortion detection.
The distorted signal that its amplitude and phase place have been regulated by regulating circuit 28 is added to through directional coupler 32 on the normal signal by the output port 27b output of power combiner 25.At this moment, distorted signal to be superimposed is to be 180 ° signal (anti-phase signal) with normal signal phase shift.
In this manner, the distorted signal on the normal signal that is added to is cancelled, and has therefore eliminated distortion.
Utilization at Fig. 2 A to the frequency spectrum shown in the 2D 1. to 4. explaining above-mentioned working condition.
1. at the frequency spectrum shown in Fig. 2 A is frequency spectrum at the signal at the input 20a place shown in Fig. 1.
2. at the frequency spectrum shown in Fig. 2 B is frequency spectrum at the signal at the output 27b place shown in Fig. 1.
3. at the frequency spectrum shown in Fig. 2 C is frequency spectrum at the signal of 28 outputs of the regulating circuit shown in Fig. 1.
4. at the frequency spectrum shown in Fig. 2 D is frequency spectrum at the signal of 33 outputs of the output shown in Fig. 1.
Here, suppose that two normal signal S1 and S2 with different frequency are input to microwave power amplifier 6.
When these input signals pass through balance amplifier, because amplifier circuit 23 as shown in fig. 2B and 24 non-linear generation distortion component N1 and N2.These distortion components N1 and N2 play frequency mixer, therefore make the characteristic degradation of amplifier circuit 23 and 24 and belong to the third distortion (harmonic distortion) that is produced by mixing normal signal S1 and S2.
On the other hand, distortion component N1 and N2 by the output port 26b of power combiner 25 output are handled as required for example decay, phase shift or amplification and their level etc. regulated.
After these distorted signals N1 and N2 is anti-phase, on the output signal (Fig. 2 B) of the port 27b that signal N1 and N2 are added at power combiner 25 through directional coupler 32.So just cause normal signal S1 and S2 undistorted, as shown in Fig. 2 D.
Present embodiment utilizes the obsolete routinely output 26b of balance amplifier as the distorted signal end, therefore no longer needs the circuit of special extraction distorted signal.Therefore, present embodiment simplifies the structure, and also therefore is applicable to for example cellular phone of small-sized communicator.
Because present embodiment no longer needs special circuit, does not need to regulate in advance the characteristic of sort circuit naturally.
Fig. 6 represents that one does not adopt the practical circuit that contrasts of the present invention (introducing) in HEI 6-37551 Japanese patent application.
In Fig. 6, in fact microwave power amplifier 6 is made up of a plurality of balance amplifiers, and this balance amplifier is made up of hybrid power divider and combined power synthesizer.
As the characteristic b that represents with solid line in Fig. 8, the I/O characteristic of this microwave power amplifier 6 becomes saturated in high input area and produces nonlinear distortion probably.In Fig. 8, the characteristic that is illustrated by the broken lines is represented Ideal Characteristics.
Therefore, the circuit shown in Fig. 6 is provided with: directional coupler 1,7 and 8, extract part by first regulating circuit 2 of conditioning signal level and phase place and the distorted signal that second regulating circuit 9 of regulating the distorted signal level that extracts and phase place etc. constitutes.
The output process directional coupler 13 of second regulating circuit 9 feeds back to the output signal of power amplifier 6, has eliminated the nonlinear distortion of power amplifier 6 with this.
The different piece shown in Fig. 6 1. the signal spectrum in 4. be illustrated respectively in Fig. 7 A in 7D.
Do not need special circuit (example custom circuit as shown in FIG. 6) to detect distorted signal at the circuit of the present invention shown in Fig. 1.That is, circuit of the present invention does not need each directional coupler 1,7 and 8 and regulating circuit 2.Therefore, the present invention has simple structure and is applicable to for example miniaturization of cellular phone of communicator.
The inherent characteristic that the present invention also utilizes balance amplifier is detection noise reliably effectively, and the noise that produces in amplifier circuit is suppressed unlike normal signal effectively by balance amplifier.Therefore, the present invention does not need therefore to have simplified the adjusting of circuit as utilizing regulating circuit 2 to regulate this characteristic in advance the example of the custom circuit shown in Fig. 6.
(embodiment 2)
Fig. 4 is a block schematic diagram of representing transmitter circuit structure according to a second embodiment of the present invention.
This transmitter circuit comprises the balance amplifier 45 and the antenna 46 of local oscillator 40, quadrature modulation circuit 43, preamplifier 44, explanation in embodiment 1.With two phase differences is that 90 ° signal (being I signal and Q signal) is input to quadrature modulation circuit 43 through signal input part 41 and 42.
Balance amplifier 45 can not need any special distortion detection circuit just to extract distorted signal.Therefore, balance amplifier 45 is applicable to transmitter miniaturization and low-cost the realization.In addition, has the feed forward type structure at the balance amplifier shown in Fig. 4 45.That is, amplifier circuit 23 and 24 distortion feed back to the circuit that is located at after amplifier circuit 23 and 24, so that offset distortion.Therefore, the amplifying signal of balance amplifier directly outputs to antenna 46, helps realizing efficient low distortion.
(embodiment 3)
Fig. 5 is the circuit diagram of the receiving circuit of expression a third embodiment in accordance with the invention.
This receiving circuit comprises antenna 50, low noise amplifier 51, utilizes compensating circuit 52, downconverter 54 and the local oscillator 53 of the balance amplifier of explaining in embodiment 1.
The reception amplifier that is directly connected to antenna 50 requires low noise and low-power consumption, so that amplify the high power signals that is received.Yet these indexs all are contradiction each other basically, under the requirement of the low cost of strictness and miniaturization, realize that low noise and low-power consumption are very difficult.
Yet balance amplifier of the present invention has distortion compensation functionality, has improved the signal to noise ratio of amplifying signal.In addition, the present invention utilizes the characteristic of the balance amplifier of simplified structure to eliminate distortion, therefore is applicable to the miniaturization and low-cost realization of communicator.
In addition, as shown in Figure 5, balance amplifier 52 is located at before the downconverter 54, makes the part of big received power can amplify conventional received signal.Its advantage is to suppress noise and be easy to improve signal to noise ratio.
As what explain above, the present invention utilizes a port of power combiner as the port that is used for detecting the distortion that produces at amplifier circuit.This just makes it possible to realize miniaturization and high performance balance amplifier with distortion compensation functionality.The present invention does not also need to carry out circuit adjustment in advance for distortion detection.
The present invention is not limited to each above-mentioned embodiment, can realize various changes and modifications under the prerequisite that does not depart from the scope of the present invention.
The application is according to the HEI 10-234581 Japanese patent application of 1998.8.20 application, and the full content that this application comprises is quoted here can be for referencial use.
Claims (3)
1. power amplifier circuit comprises:
Hybrid power divider, it comprises provides the first input end of input signal mouth, be connected with second input port and first and second output ports of terminating resistor;
The combined power synthesizer, second output port that it comprises first and second input ports, is used as first output port of distortion detection port and is used as the normal signal output port;
First amplifier circuit, it is connected between the described first input end mouth of described first output port of described hybrid power divider and described combined power synthesizer; And
Second amplifier circuit, it is connected between described second input port of described second output port of described hybrid power divider and described combined power synthesizer,
It is characterized in that this power amplifier circuit also is equipped with compensating circuit, described compensating circuit comprises:
Regulating circuit, it comprises variable attenuator, phase shifter and amplifier circuit, is used to regulate from the level and the phase place of the distorted signal of described first output port output of described combined power synthesizer; And
Feedback circuit, its output with described regulating circuit feed back to the normal signal by described second output port output of described combined power synthesizer.
2. transmitter that comprises power amplifier circuit, wherein said power amplifier circuit comprises:
Hybrid power divider, it comprises provides the first input end of input signal mouth, be connected with second input port and first and second output ports of terminating resistor;
The combined power synthesizer, second output port that it comprises first and second input ports, is used as first output port of distortion detection port and is used as the normal signal output port;
First amplifier circuit, it is connected between the described first input end mouth of described first output port of described hybrid power divider and described combined power synthesizer; And
Second amplifier circuit, it is connected between described second input port of described second output port of described hybrid power divider and described combined power synthesizer,
It is characterized in that this power amplifier circuit also is equipped with compensating circuit, described compensating circuit comprises:
Regulating circuit, it comprises variable attenuator, phase shifter and amplifier circuit, is used to regulate from the level and the phase place of the distorted signal of described first output port output of described combined power synthesizer; And
Feedback circuit, its output with described regulating circuit feed back to the normal signal by described second output port output of described combined power synthesizer.
3. receiver that comprises power amplifier circuit, wherein said power amplifier circuit comprises:
Hybrid power divider, it comprises provides the first input end of input signal mouth, be connected with second input port and first and second output ports of terminating resistor;
The combined power synthesizer, second output port that it comprises first and second input ports, is used as first output port of distortion detection port and is used as the normal signal output port;
First amplifier circuit, it is connected between the described first input end mouth of described first output port of described hybrid power divider and described combined power synthesizer; And
Second amplifier circuit, it is connected between described second input port of described second output port of described hybrid power divider and described combined power synthesizer,
It is characterized in that this power amplifier circuit also is equipped with compensating circuit, described compensating circuit comprises:
Regulating circuit, it comprises variable attenuator, phase shifter and amplifier circuit, is used to regulate from the level and the phase place of the distorted signal of described first output port output of described combined power synthesizer; And
Feedback circuit, its output with described regulating circuit feed back to the normal signal by described second output port output of described combined power synthesizer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00102379 CN1131588C (en) | 2000-02-21 | 2000-02-21 | Power amplifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00102379 CN1131588C (en) | 2000-02-21 | 2000-02-21 | Power amplifier |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1310516A CN1310516A (en) | 2001-08-29 |
| CN1131588C true CN1131588C (en) | 2003-12-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 00102379 Expired - Fee Related CN1131588C (en) | 2000-02-21 | 2000-02-21 | Power amplifier |
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| CN (1) | CN1131588C (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2004077661A1 (en) * | 2003-02-25 | 2004-09-10 | Huawei Technologies Co., Ltd. | Power amplifying device |
| JP4859049B2 (en) * | 2006-11-27 | 2012-01-18 | ルネサスエレクトロニクス株式会社 | RF power amplifying device and wireless communication terminal device equipped with the same |
| CN101394191B (en) * | 2007-09-19 | 2012-08-08 | 华为技术有限公司 | Low noise amplifier module and radio communication apparatus |
| JP5532983B2 (en) * | 2010-02-04 | 2014-06-25 | 三菱電機株式会社 | Detection circuit and semiconductor device using the same |
| CN105006606B (en) * | 2015-07-13 | 2018-07-10 | 深圳市华信天线技术有限公司 | Radiofrequency signal phase-shift network |
| EP3399646B1 (en) * | 2017-05-05 | 2020-02-26 | Rohde & Schwarz GmbH & Co. KG | Amplifier arrangement and method |
| CN108400774B (en) * | 2018-03-22 | 2020-06-02 | 上海唯捷创芯电子技术有限公司 | Balanced radio frequency power amplifier, chip and communication terminal |
-
2000
- 2000-02-21 CN CN 00102379 patent/CN1131588C/en not_active Expired - Fee Related
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| CN1310516A (en) | 2001-08-29 |
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