CN109302149B - Signal amplifying circuit - Google Patents
Signal amplifying circuit Download PDFInfo
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- CN109302149B CN109302149B CN201710617294.6A CN201710617294A CN109302149B CN 109302149 B CN109302149 B CN 109302149B CN 201710617294 A CN201710617294 A CN 201710617294A CN 109302149 B CN109302149 B CN 109302149B
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- 230000000087 stabilizing effect Effects 0.000 claims abstract description 31
- 230000001629 suppression Effects 0.000 claims abstract description 21
- 230000003321 amplification Effects 0.000 claims abstract description 19
- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 19
- 239000003990 capacitor Substances 0.000 claims description 16
- 230000005540 biological transmission Effects 0.000 claims description 7
- 230000006641 stabilisation Effects 0.000 claims 2
- 238000011105 stabilization Methods 0.000 claims 2
- 238000010586 diagram Methods 0.000 description 8
- 230000000694 effects Effects 0.000 description 5
- 238000000034 method Methods 0.000 description 3
- 230000002159 abnormal effect Effects 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 2
- 230000008094 contradictory effect Effects 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/02—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation
- H03F1/0205—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation in transistor amplifiers
- H03F1/0288—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation in transistor amplifiers using a main and one or several auxiliary peaking amplifiers whereby the load is connected to the main amplifier using an impedance inverter, e.g. Doherty amplifiers
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/56—Modifications of input or output impedances, not otherwise provided for
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/189—High-frequency amplifiers, e.g. radio frequency amplifiers
- H03F3/19—High-frequency amplifiers, e.g. radio frequency amplifiers with semiconductor devices only
- H03F3/195—High-frequency amplifiers, e.g. radio frequency amplifiers with semiconductor devices only in integrated circuits
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/20—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers
- H03F3/21—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers with semiconductor devices only
- H03F3/211—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers with semiconductor devices only using a combination of several amplifiers
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/20—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers
- H03F3/21—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers with semiconductor devices only
- H03F3/213—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers with semiconductor devices only in integrated circuits
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F2200/00—Indexing scheme relating to amplifiers
- H03F2200/451—Indexing scheme relating to amplifiers the amplifier being a radio frequency amplifier
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Amplifiers (AREA)
- Microwave Amplifiers (AREA)
Abstract
The invention discloses a signal amplification circuit, which comprises a stabilizing circuit, wherein the stabilizing circuit comprises an out-of-band signal suppression circuit, a radio frequency selection device and an impedance converter; the first end of the impedance converter presents high impedance, the second end of the impedance converter is connected with one end of the radio frequency selection device, and the radio frequency selection device is grounded relative to the other end of the impedance converter; two ends of the out-of-band signal suppression circuit are respectively connected with two ends of the radio frequency selection device; the first end of the impedance transformer is connected with the output end of the input matching circuit and the input end of the amplifier or the first end of the impedance transformer is connected with the output end of the amplifier and the input end of the output matching circuit or the first end of the impedance transformer is connected with the input end of the input matching circuit and the radio frequency input terminal for inputting signals or the impedance transformer is connected with the output end of the output matching circuit and the radio frequency output terminal for outputting signals. The invention improves the stability of the signal amplifying circuit.
Description
Technical Field
The invention relates to the field of circuits, in particular to a signal amplification circuit.
Background
With the development of system integration technology, multi-stage amplifiers are widely used. In order to improve the stability of such a multi-stage amplifier circuit, a resistor is usually connected in series at the input end of the multi-stage amplifier or an out-of-band attenuation network is connected in the input end of the multi-stage amplifier, but when the resistor is connected in series at the input end of the multi-stage amplifier or the out-of-band attenuation network, the resistor can only act on the input end of a preceding stage small-signal amplifier of the multi-stage amplifier, and other areas of the packaged multi-stage amplifier do not act, so that the method has no remarkable effect on improving the stability of the circuit.
Disclosure of Invention
The invention mainly aims to provide a signal amplifying circuit, and aims to solve the problem that the effect of serially connecting resistors or an out-of-band attenuation network at the input end of a multi-stage amplifier on improving the stability of the amplifying circuit is not outstanding.
In order to achieve the above object, the present invention provides a signal amplification circuit including an input matching circuit, an output matching circuit, and an amplifier for amplifying an input signal; the input matching circuit and the output matching circuit are used for performing impedance matching, the output end of the input matching circuit is connected with the input end of the amplifier, and the output end of the amplifier is connected with the input end of the output matching circuit;
the signal amplification circuit further comprises a stabilizing circuit, and the stabilizing circuit comprises an out-of-band signal suppression circuit, a radio frequency selection device and an impedance converter; the first end of the impedance converter presents high impedance, the second end of the impedance converter is connected with one end of the radio frequency selection device, and the other end of the radio frequency selection device, which is opposite to the impedance converter, is grounded; two ends of the out-of-band signal suppression circuit are respectively connected with two ends of the radio frequency selection device;
the first end of the impedance transformer is connected with the output end of the input matching circuit and the input end of the amplifier, or the first end of the impedance transformer is connected with the output end of the amplifier and the input end of the output matching circuit, or the first end of the impedance transformer is connected with the input end of the input matching circuit and the radio frequency input terminal for inputting signals, or the impedance transformer is connected with the output end of the output matching circuit and the radio frequency output terminal for outputting signals.
Preferably, the signal amplification circuit further comprises a bias power input terminal, a gate feed circuit and a drain feed circuit; one end of the grid feed circuit is connected with the input end of the amplifier, and one end of the grid feed circuit is connected with the input end of the bias power supply; one end of the drain electrode feed circuit is connected with the power supply input end, and the other end of the drain electrode feed circuit is connected with the output end of the amplifier.
Preferably, the first terminal of the stabilizing circuit is arranged between the gate feed circuit and the input terminal of the amplifier.
Preferably, the first end of the stabilizing circuit is disposed between the output of the amplifier and the drain feed circuit.
Preferably, the operating frequency of the impedance transformer and the radio frequency selection device is the same as the operating frequency of the amplifier.
Preferably, the radio frequency selection device is a microwave capacitor corresponding to the operating frequency of the amplifier.
Preferably, the impedance transformer is a transmission line having a length equal to one quarter of the center wavelength of the signal.
Preferably, the transmission line is a microstrip line or a stripline.
Preferably, the out-of-band signal suppression circuit includes a resistor and a filter capacitor, one end of the resistor is connected to the impedance converter, the other end of the resistor is connected to one end of the filter capacitor, and the other end of the filter capacitor is grounded.
Preferably, the amplifier is a power amplifier.
According to the technical scheme, the stabilizing circuit is arranged in the signal amplifying circuit and is combined with the out-of-band signal suppression circuit through the impedance converter and the radio frequency selection device, the out-of-band signal suppression circuit suppresses signals outside a working frequency band, the stability of the circuit is improved, meanwhile, the impedance converter presents high resistance, the leakage of the working frequency band signals of the amplifier is prevented, and the out-of-band signal suppression circuit does not influence the amplification of the working frequency band signals. In addition, the setting positions of various stabilizing circuits are provided, and the design and the layout are convenient.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a schematic diagram of a stabilizing circuit in an embodiment of a signal amplifying circuit according to the present invention;
FIG. 2 is a block diagram of a signal amplification circuit according to an embodiment of the present invention;
FIG. 3 is a block diagram of another embodiment of a signal amplifying circuit according to the present invention;
FIG. 4 is a block diagram of a signal amplifying circuit according to another embodiment of the present invention;
FIG. 5 is a block diagram of a signal amplifying circuit according to another embodiment of the present invention;
FIG. 6 is a block diagram of a signal amplifying circuit according to another embodiment of the present invention;
fig. 7 is a block diagram of a signal amplifying circuit according to another embodiment of the present invention.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
The reference numbers illustrate:
| reference numerals | Name (R) | Reference numerals | Name (R) | |
| 10 | |
43 | Out-of-band |
|
| 20 | Amplifier with a high-frequency amplifier | R | |
|
| 30 | Output matching circuit | | Filter capacitor | |
| 40 | Stabilizing circuit | RFIN | Radio |
|
| 50 | Gate feed circuit | RFOUT | Radio |
|
| 60 | Drain electrode feed circuit | BIASIN | Bias power |
|
| 41 | Impedance transformer | VCCIN | |
|
| 42 | Radio frequency selection device |
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that all the directional indicators (such as upper, lower, left, right, front, and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the motion situation, and the like in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.
In addition, the descriptions related to "first", "second", etc. in the present invention are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
The invention provides a signal amplifier.
Referring to fig. 1 to 5 together, the signal amplifying circuit includes an input matching circuit 10, an amplifier 20 for amplifying an input signal, and an output matching circuit 30; wherein, the input matching circuit 10 and the output matching circuit 30 are used to perform impedance matching, the output terminal of the input matching circuit 10 is connected to the input terminal of the amplifier 20, and the output terminal of the amplifier 20 is connected to the input terminal of the output matching circuit 30;
the signal amplifying circuit further comprises a stabilizing circuit 40, wherein fig. 1 is a specific structural schematic diagram of the stabilizing circuit 40 in the signal amplifying circuit, and the stabilizing circuit 40 comprises an impedance converter 41, a radio frequency selection device 42 and an out-of-band signal suppression circuit 43; a first end of the impedance transformer 41 presents high impedance, a second end of the impedance transformer 41 is connected with one end of the radio frequency selection device 42, and the other end of the radio frequency selection device 42 opposite to the impedance transformer 41 is grounded; two ends of the out-of-band signal suppression circuit 43 are respectively connected with two ends of the radio frequency selection device 42;
a first end of the impedance transformer 41 is connected to the output end of the input matching circuit 10 and the input end of the amplifier 20, a first end of the impedance transformer 41 is connected to the output end of the amplifier 20 and the input end of the output matching circuit 30, a first end of the impedance transformer 41 is connected to the input end of the input matching circuit 10 and the radio frequency input terminal RFIN for input signals, or the impedance transformer 41 is connected to the output end of the output matching circuit 30 and the radio frequency output terminal RFOUT for output signals.
In the signal amplification circuit, an amplifier 20 can be set according to actual needs, and is divided according to the type of the amplifier 20, and the amplifier 20 can be an MOS tube or a triode; taking a triode as an example, the base of the triode may be used as the input terminal of the amplifier 20, the collector of the triode may be used as the output terminal of the amplifier 20, and the emitter of the triode may be grounded. The amplifier 20 may be a power amplifier for generating a maximum power output at a given distortion rate, divided by the function of the amplifier 20. Optionally, the amplifier 20 is a multi-stage amplifier, i.e., an electronic component that internally packages two or more amplifiers.
In the embodiment of the present invention, a stabilizing circuit 40 is further provided in addition to the input matching circuit 10, the output matching circuit 30 and the amplifier 20, the stabilizing circuit 40 is used for improving the stability of the signal amplifying circuit while not affecting the operating frequency band characteristics of the amplifier 20, and the operating frequencies of the radio frequency selecting device 42 and the impedance transformer 41 in the stabilizing circuit 40 may be consistent with the operating frequency of the amplifier 20. The radio frequency selection device 42 may be a microwave capacitor corresponding to the operating frequency of the amplifier 20; it is understood that the radio frequency selecting device 42 may also adopt other radio frequency selecting devices, such as a microstrip line, which is not exhaustive here. The specific implementation method of the stabilizing circuit 40 is to provide the out-of-band signal suppression circuit 43, the radio frequency selection device 42 and the impedance converter 41, where one end of the impedance converter 41 is used as an output end of the stabilizing circuit 40 to present high impedance, that is, looking into an access point between a radio frequency path where the amplifier 20 is located and the stabilizing circuit 40, the impedance of the corresponding operating frequency band signal circuit is high impedance, so as to achieve the effect of preventing the operating frequency band signal from leaking, and the out-of-band signal suppression circuit 43 does not affect the operating frequency band characteristics of the amplifier 20. On the premise of not influencing the normal operation of the amplifier 20, the resistor R and the filter capacitor C are connected in series to form the out-of-band signal suppression circuit 43, the damping effect of the resistor R is utilized to improve the stability of the circuit, and the DC blocking and AC blocking characteristics of the filter capacitor C prevent the resistor R from being burnt due to large DC power formed on the resistor R and suppress signals except for the working frequency band.
In addition, since the stabilizing circuit presents high impedance to the outside, the setting of the specific position can be set according to actual needs, the stabilizing circuit 40 does not need to be arranged at a fixed position, and the effect of improving the stability of the signal amplifying circuit and the like can be realized only by connecting the stabilizing circuit 40 in parallel on the radio frequency path of the amplifier 20, thereby facilitating the layout and design of the circuit.
Further, the specific structure of the impedance transformer 41 may be set according to actual needs, and may be a transmission line with a length equal to a quarter of the center wavelength of the signal, and the transmission line may be a microstrip line, or a strip line. It should be noted that the quarter-wave impedance transformer 41 can be regarded as a finite length transmission line that transforms the voltage and current at the termination and the load impedance at the termination, and can perform a good echo suppression or cancellation function.
The out-of-band signal suppression circuit 43 formed by the resistor R and the filter capacitor C has a circuit structure in which one end of the resistor R is connected to the impedance converter 41, the other end of the resistor R is connected to one end of the filter capacitor C, and the other end of the filter capacitor C is grounded.
Further, referring to fig. 6 and 7, the signal amplifying circuit further includes a bias power input terminal BIASIN, a power input terminal VCCIN, a gate feeding circuit 50, and a drain feeding circuit 60; one end of the gate feed circuit 50 is connected to the input terminal of the amplifier 20, and the other end of the gate feed circuit 50 is connected to the bias power input terminal BIASIN; one end of the drain feed circuit 60 is connected to the power input terminal VCCIN, and the other end of the drain feed circuit 60 is connected to the output terminal of the amplifier 20. At this time, the first terminal of the stabilizing circuit 40 may also be disposed between the gate feed circuit 50 and the input terminal of the amplifier 20 or between the output terminal of the amplifier 20 and the drain feed circuit 60.
It should be noted that, in order to make the amplifier 20 work normally, a power supply terminal must be provided for the amplifier 20, in the present technical solution, a gate power supply circuit 50 and a drain power supply circuit 60 are respectively provided in combination with the bias power input terminal BIASIN and the power input terminal VCCIN, so as to supply power to the rf channel where the amplifier 20 is located. Meanwhile, the stabilizing circuit 40 is arranged between the gate feed circuit 50 and the input end of the amplifier 20 in parallel or between the drain feed circuit 60 and the output end of the amplifier 20 in parallel, so that the impedance of the corresponding working frequency band signal circuit is high when viewed from the connection point of the stabilizing circuit 40 and the main loop of the amplifier 20, and the influence of the out-of-band signal suppression circuit 43 in the stabilizing circuit 40 on the working frequency band characteristic of the amplifier 20 is avoided.
The following description will be made by taking a specific embodiment, taking a 3.5 ghz Doherty power amplifier as an example, the power supply of the power amplifier is 28V, a stabilizing circuit is connected between the input end of the output matching circuit and the output end of the amplifier, the impedance changer is selected as a quarter-wavelength microstrip line, the length is 12.7mm, the width is 0.5mm, and the radio frequency selection device is selected as a 5.6pf microwave capacitor. The resistance value of a resistor in the out-of-band signal suppression circuit is 50 ohms, and the filter capacitance is 0.1 UF. Before the signal amplifier circuit is not connected with the stabilizing circuit, the low frequency has an abnormal signal which is-10 dB lower than the main signal, after the signal amplifier circuit is added into the stabilizing circuit, the abnormal signal disappears, and the power amplifier output power and efficiency when the amplifier outputs the signal from the output terminal do not change obviously.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. A signal amplification circuit, characterized by comprising an input matching circuit, an output matching circuit and an amplifier for amplifying an input signal; the input matching circuit and the output matching circuit are used for performing impedance matching, the output end of the input matching circuit is connected with the input end of the amplifier, and the output end of the amplifier is connected with the input end of the output matching circuit;
the signal amplification circuit also comprises a stabilizing circuit, and the stabilizing circuit comprises an out-of-band signal suppression circuit, a radio frequency selection device and an impedance converter; the first end of the impedance converter presents high impedance, the second end of the impedance converter is connected with one end of the radio frequency selection device, and the other end of the radio frequency selection device, which is opposite to the impedance converter, is grounded; two ends of the out-of-band signal suppression circuit are respectively connected with two ends of the radio frequency selection device;
the first end of the impedance transformer is connected with the output end of the input matching circuit and the input end of the amplifier, or the first end of the impedance transformer is connected with the output end of the amplifier and the input end of the output matching circuit, or the first end of the impedance transformer is connected with the input end of the input matching circuit and the radio frequency input terminal for inputting signals, or the first end of the impedance transformer is connected with the output end of the output matching circuit and the radio frequency output terminal for outputting signals.
2. The signal amplification circuit of claim 1, further comprising a bias supply input, a power supply input, a gate feed circuit, and a drain feed circuit; one end of the grid feed circuit is connected with the input end of the amplifier, and one end of the grid feed circuit is connected with the input end of the bias power supply; one end of the drain electrode feed circuit is connected with the power supply input end, and the other end of the drain electrode feed circuit is connected with the output end of the amplifier.
3. The signal amplification circuit of claim 2, wherein the first end of the stabilization circuit is disposed between the gate feed circuit and the input of the amplifier.
4. The signal amplification circuit of claim 2, wherein the first end of the stabilization circuit is disposed between the output of the amplifier and the drain feed circuit.
5. The signal amplification circuit of claim 1, wherein the impedance transformer and the radio frequency selective device operate at the same frequency as the amplifier.
6. The signal amplification circuit of claim 5, wherein the radio frequency selective device is a microwave capacitor corresponding to an operating frequency of the amplifier.
7. The signal amplification circuit of claim 1, wherein the impedance transformer is a transmission line having a length equal to one quarter of a center wavelength of the signal.
8. The signal amplification circuit of claim 7, wherein the transmission line is a microstrip line or a stripline.
9. The signal amplification circuit of any one of claims 1-8, wherein the out-of-band signal suppression circuit comprises a resistor and a filter capacitor, one end of the resistor is connected to the impedance transformer, the other end of the resistor is connected to one end of the filter capacitor, and the other end of the filter capacitor is connected to ground.
10. The signal amplification circuit of any one of claims 1-8, wherein the amplifier is a power amplifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710617294.6A CN109302149B (en) | 2017-07-25 | 2017-07-25 | Signal amplifying circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710617294.6A CN109302149B (en) | 2017-07-25 | 2017-07-25 | Signal amplifying circuit |
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| Publication Number | Publication Date |
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| CN109302149A CN109302149A (en) | 2019-02-01 |
| CN109302149B true CN109302149B (en) | 2023-04-07 |
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| CN201710617294.6A Active CN109302149B (en) | 2017-07-25 | 2017-07-25 | Signal amplifying circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| TWI704767B (en) * | 2019-09-02 | 2020-09-11 | 立積電子股份有限公司 | Amplification device |
| CN114157252B (en) * | 2021-11-30 | 2023-11-28 | 深圳飞骧科技股份有限公司 | Power amplifying circuit and radio frequency signal processing method |
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| CN201541238U (en) * | 2009-09-11 | 2010-08-04 | 清华大学 | Preamplifier of magnetic resonance imaging MRI system capable of reducing low-frequency noise |
| CN103490733A (en) * | 2013-09-26 | 2014-01-01 | 华东交通大学 | Double-frequency-band Doherty power amplifier with frequency ratio of 1.25-2.85 |
| WO2015006441A2 (en) * | 2013-07-11 | 2015-01-15 | Crestcom, Inc. | Transmitter and method with rf power amplifier having stabilized bias |
| CN104716911A (en) * | 2013-12-13 | 2015-06-17 | 中兴通讯股份有限公司 | Radio frequency power amplifier, base station and impedance adjusting method |
| CN204794909U (en) * | 2015-07-21 | 2015-11-18 | 桂林电子科技大学 | A RF power amplifier for coupling resonance wireless power transmission device |
| CN106301237A (en) * | 2016-07-25 | 2017-01-04 | 北京工业大学 | Low-power consumption three frequency band low-noise amplifier |
| CN106712725A (en) * | 2016-11-03 | 2017-05-24 | 南京邮电大学 | Ultra wideband high-gain low noise amplifier based on monolithic microwave integrated circuit |
-
2017
- 2017-07-25 CN CN201710617294.6A patent/CN109302149B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201541238U (en) * | 2009-09-11 | 2010-08-04 | 清华大学 | Preamplifier of magnetic resonance imaging MRI system capable of reducing low-frequency noise |
| WO2015006441A2 (en) * | 2013-07-11 | 2015-01-15 | Crestcom, Inc. | Transmitter and method with rf power amplifier having stabilized bias |
| CN103490733A (en) * | 2013-09-26 | 2014-01-01 | 华东交通大学 | Double-frequency-band Doherty power amplifier with frequency ratio of 1.25-2.85 |
| CN104716911A (en) * | 2013-12-13 | 2015-06-17 | 中兴通讯股份有限公司 | Radio frequency power amplifier, base station and impedance adjusting method |
| CN204794909U (en) * | 2015-07-21 | 2015-11-18 | 桂林电子科技大学 | A RF power amplifier for coupling resonance wireless power transmission device |
| CN106301237A (en) * | 2016-07-25 | 2017-01-04 | 北京工业大学 | Low-power consumption three frequency band low-noise amplifier |
| CN106712725A (en) * | 2016-11-03 | 2017-05-24 | 南京邮电大学 | Ultra wideband high-gain low noise amplifier based on monolithic microwave integrated circuit |
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