CN110535447A - The eight road power combing harmonic controling power amplification circuits suitable for RF power amplification - Google Patents
The eight road power combing harmonic controling power amplification circuits suitable for RF power amplification Download PDFInfo
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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
- H03F1/26—Modifications of amplifiers to reduce influence of noise generated by amplifying elements
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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
- H03F1/32—Modifications of amplifiers to reduce non-linear distortion
- H03F1/3205—Modifications of amplifiers to reduce non-linear distortion in field-effect transistor 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
- H03F1/32—Modifications of amplifiers to reduce non-linear distortion
- H03F1/3211—Modifications of amplifiers to reduce non-linear distortion in differential amplifiers
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- 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
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- 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
- H03F3/24—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers of transmitter output stages
- H03F3/245—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers of transmitter output stages with semiconductor devices only
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
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- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/45—Differential amplifiers
- H03F3/45071—Differential amplifiers with semiconductor devices only
- H03F3/45076—Differential amplifiers with semiconductor devices only characterised by the way of implementation of the active amplifying circuit in the differential amplifier
- H03F3/45179—Differential amplifiers with semiconductor devices only characterised by the way of implementation of the active amplifying circuit in the differential amplifier using MOSFET transistors as the active amplifying circuit
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
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Abstract
The invention belongs to IC design technical field, specially a kind of eight road power combing harmonic controling circuits suitable for radio-frequency power amplifier.Radio-frequency power amplifier of the invention is made of first order power pre-amplification circuit, second level power pre-amplification circuit and the main power amplification circuit of output stage；Main power amplification circuit is made of power amplification circuit, the power combing 1:2 on-chip transformer of 8 road current-voltage modes and harmonic controling circuit, and power amplification circuit is made of capacitance, biasing resistor, NMOS power tube；The transformer can increase multiple high-output power amplifying circuits in the case where not changing optimal load impedance, and alleviating parasitic capacitance bring influences, and significantly improves output power, reach the high-output power that CMOS technology is very difficult to reach.The present invention program is connected by multiple power-amplifier stages, helps to significantly improve output power, can be used as radio-frequency power amplifier, also can be applied in many equipment for having power amplification function.
Description
Technical field
The invention belongs to technical field of integrated circuits, and in particular to a kind of eight road power suitable for radio-frequency power amplifier
Synthesize harmonic controling power amplification circuit.
Background technique
Huge variation has occurred in wireless communication industry in recent years, and wireless communication technique substantially increases people's lives matter
Amount, the fast continual development of the global radio communication technology become one of the core of 21 century industrial development.With wireless communication
Rapid growth, the production firms of wireless terminal improve one of main method of income be reduce terminal cost.In
In the design of radio-frequency power amplifier, since it is to output power, the requirement of the linearity, nowadays the power amplifier of mainstream is big
Mostly it is designed using GaAs or SiGe, if to be further reduced cost, integrated level height, relatively inexpensive CMOS
Technique becomes inevitable choice, but due to some disadvantages of CMOS technology --- on piece passive device Q value is lower, substrate damages
The presence of the problems such as larger, active device breakdown voltage is too low is consumed, so that having with the radio frequency applications under CMOS technology very big
Challenge, therefore, various technologies are come into being.And eight road power combing harmonic controling power amplification circuits are for CMOS
The technology that various problems propose under technique.
Since under CMOS technology, active device breakdown voltage is lower, the supply voltage in the case where non-pressure resistance is often below
2V, if exporting very big power, the size of pipe will necessarily obtain it is very big, this will cause two it is tight
Weight problem, one be pipe parasitic capacitance it is larger so that the gain of power amplification becomes very when upper frequency
It is low, so that non-linear become strongly, second is that so big electric current, brings very big difficulty to layout design, and
So big electric current can also make the loss of dead resistance bring abnormal obvious, reduce the efficiency of power amplifier, while also giving
Heat dissipation brings acid test, and the CMOS radio-frequency power amplifier that such problems allows for designing high-power is extremely difficult,
And power synthetic technique can alleviate this problem well, and if the output power of 2W or more to be obtained, it uses
Eight road power combings almost can be described as inevitable.On the other hand, most of radio-frequency power amplifier, due to consideration that output
The linearity and efficiency compromise, most of to be biased in AB class, the power amplifier of AB class has a feature, is exactly exporting
When power is larger, obviously gain reduction can be generated, and since power amplifier works in the state of big signal,
Therefore influence of the gate capacitance to its linearity is very big (gate capacitance can change according to gate voltage), therefore auxiliary power is added and puts
Help to further improve the linearity and efficiency greatly.In the impedance matching of radio-frequency power amplifier, capacitor is essential
Element, rationally utilize chip area, using capacitor realize high-order harmonic controling, be conducive to secondary and triple-frequency harmonics of decaying,
On the basis of not influencing available circuit, the linearity of integrated circuit is further increased.
The present invention is directed to the eight road power combing harmonic controling power amplification circuits for being applicable in radio-frequency power amplifier, passes through eight
Road power combing and harmonic wave control circuit, the output power and the linearity of Lai Tigao radio-frequency power amplifier realize general technology
Under the radio-frequency power amplifier of high-output power high linearity that is unable to reach.
Summary of the invention
The purpose of the present invention is to provide high eight tunnels for being applicable in radio-frequency power amplifier of a kind of output power and the linearity
Power combing harmonic controling power amplification circuit.
The eight road power combing harmonic controling power amplification circuits provided by the invention suitable for radio-frequency power amplifier lead to
Eight road power combings and harmonic wave control circuit are crossed, the output power and the linearity of Lai Tigao radio-frequency power amplifier are realized general
The radio-frequency power amplifier for the high-output power high linearity being unable to reach under technology.Rf power amplifier circuit of the invention by
Following three parts are constituted: first order power pre-amplification circuit, second level power pre-amplification circuit and the main power amplification of output stage
Circuit, as shown in Figure 1.Wherein:
The first order power pre-amplification circuit is by an input matching transformer, a main offer gain and guarantees the linearity
Pre-amplification power circuit and current-mode power distribution transformer constitute, it is enough to be provided for subsequent circuit
Input power；The primary side of input matching transformer is the input of radiofrequency signal, and secondary side and the grid for preventing high-power circuit connect,
The primary side of the output drain electrode and current-mode power distribution transformer that prevent high-power circuit connects, and current-mode power distribution becomes
The grid that the secondary side and second level power of depressor prevent the pre-amplification power circuit in big circuit connects.Radiofrequency signal from input
Primary side with transformer enters, and by the coupling of transformer, comes out from secondary side, subsequently enters the grid of pre-amplification power circuit,
It after amplification, comes out from the drain electrode of pre-amplification power circuit, into the primary side of current-mode power distribution transformer, passes through
Coupling, comes out from secondary side, into the grid of pre-amplification power circuit in the power pre-amplification circuit of the second level；
The second level power pre-amplification circuit is made of an interstage matched transformer, a pre-amplification power circuit, due to
Finally the output power of main power-amplifier stage is larger, and the parasitic capacitance of circuit is larger, and gain is lower, therefore pre-amplification power circuit
Linear power output also can be higher；The grid and first order power of pre-amplification power circuit prevent the current-mode in big circuit
The secondary side of power distribution transformer connects, and the primary side of output drain electrode and interstage matched transformer connects, secondary side and the main function of output stage
The input of the second harmonic control circuit of rate amplifying circuit connects.The input of the second harmonic control circuit and second level power are put in advance
The secondary side of the interstage matched transformer of big circuit connects, and the grid of output and main power amplification circuit connects, main power amplification electricity
The primary side of the power combing 1:2 transformer of the output drain electrode and 8 road current-voltage modes on road connects, secondary side and three order harmonics controls
The input of circuit processed connects, and the output of three order harmonics control circuits and antenna connect, and is the output of radiofrequency signal, comes from the first order
The signal of power pre-amplification circuit enters from the grid of pre-amplification power circuit, after amplification, comes out from drain electrode, into grade
Between the primary side of matching transformer come out through overcoupling from secondary side, into the harmonic controling electricity in the main power amplification circuit of output stage
Lu Zhong；
The main power amplification circuit of output stage is by power amplification circuit, the power combing 1:2 transformation of 8 road current-voltage modes
Device, second order and three order harmonics control circuits are constituted, and structure is as shown in Figure 2.Power amplification circuit is divided into two parts: main power
Amplifier section and auxiliary amplifier section, each part is made of capacitance, biasing resistor, NMOS power tube；Harmonic controling electricity
The inductance and capacitor composition of phase mutual resonance are routed, the power combing 1:2 transformer of 8 road current-voltage modes is by two current-modes
4 road power combing transformer series of formula form；From the second level, power prevents the signal of big circuit from harmonic controling circuit
Into by filtering and then being come out into the grid of main power amplification circuit from drain electrode, after amplification into 8 tunnels
The primary side of the power combing 1:2 transformer of current-voltage mode is exported through overcoupling from secondary side, using harmonic controling electricity
Road, final output to antenna.
In the present invention, in the first order power amplification circuit, radiofrequency signal enters from the primary side of input matching transformer,
It through overcoupling, is come out from secondary side, subsequently enters the grid of pre-amplification power circuit, after amplification, from pre-amplification power electricity
The drain electrode on road comes out, and is come out into the primary side of current-mode power distribution transformer by the coupling of transformer from secondary side, into
The grid for entering to second level power to prevent the prevention high-power circuit in big circuit comes out, second level function by amplification from drain electrode
The output end of rate pre-amplification circuit is connected with the input terminal of eight road power combing harmonic controling amplifying circuits, radiofrequency signal from
VIN_N+, VIN_N-, VIN_P+, VIN_P- enter eight road power combing harmonic controling power amplification circuits, by the second harmonic
Control circuit after decaying to the second harmonic component in input signal, has entered the main power amplification circuit of output stage
In, in power amplification unit, enter from VIN_N and VIN_P, while amplifying by main power amplification and auxiliary power, this two
A part respectively amplifies signal, and complements each other, and can inhibit the generation of second harmonic and triple-frequency harmonics, makes up simultaneously
The gain reduction that main power amplification is generated in high-output power reduces AM-AM distortion, stablizes input and output capacitor, reduces
AM-PM distortion, last signal are exported from the both ends VOUT_N and VOUT_P, enter the power combing 1 of 8 road current-voltage modes:
In 2 transformers, after by power combing, signal out finally passes through three order harmonics control circuits, to three in signal
After order harmonic component is decayed, final output.
Power combing harmonic controling power amplification circuit in eight roads provided by the invention, has the following advantages:
(1) in the case where not changing optimal load impedance, by transformer, increase multiple high-output power amplifying circuits, delay
Solving parasitic capacitance bring influences, and improves circuit entire gain, and significantly improve output power, reaches CMOS skill under normal circumstances
Art is very difficult to the high-output power reached；
(2) it will be originally used for the capacitor of impedance matching, equivalent inductance capacitance series network replaces at fundamental wave, is formed to height
The low resistance path of subharmonic, so that transformer filters higher hamonic wave while completing power combing, impedance matching
Wave reduces the non-linear of output；
(3) there are main power amplification branches and auxiliary power to amplify branch in power amplification unit, and the two complements each other, certain journey
Inhibit the generation of second harmonic and triple-frequency harmonics on degree, while making up the gain that main power amplification is generated in high-output power
Decaying reduces AM-AM distortion, stablizes input and output capacitor, reduces AM-PM distortion.
Detailed description of the invention
Fig. 1 is the rf power amplifier circuit structure using eight road power combing harmonic controlings.
Fig. 2 is the eight road power combing harmonic controling circuits that the present invention designs.
Fig. 3 is the power combing 1:2 transformer specific structure of 8 road current-voltage modes.
Fig. 4 is the rf power amplifier circuit output power and efficiency curve using eight road power combing harmonic controlings.
Specific embodiment
Below according to attached drawing and design example, the present invention is described in detail.
The eight road power combing harmonic controling power amplification circuits provided by the invention suitable for radio-frequency power amplifier, by
Three parts are constituted, as shown in Figure 1, being first order power pre-amplification circuit, second level power pre-amplification circuit, and output respectively
The main power amplification circuit of grade, i.e. eight road power combing harmonic controling power amplification circuits.Wherein first order power pre-amplification circuit
By an input matching transformer, a main pre-amplification power circuit and an electric current for providing gain and guaranteeing the linearity
Mode power distribution transformer is constituted, and the primary side for inputting matching transformer is the input of radiofrequency signal, and secondary side and prevention are high-power
The grid of circuit connects, and the primary side of the output drain electrode and current-mode power distribution transformer that prevent high-power circuit connects, electricity
The grid that the secondary side and second level power of stream mode power distribution transformer prevent the pre-amplification power circuit in big circuit connects.
In this example, this level-one pre-amplification stage provides about 15dB gain, while output power has 180 degree phase difference, while basis
The demand of second level power pre-amplification circuit adjusts breadth length ratio, makes it possible to provide for the big circuit of second level power prevention enough
Linear power input, while matching transformer is inputted when design, as much as possible while reducing area, reduce insertion
Loss increases the bandwidth of input scattering coefficient S11, and current-mode power distribution transformer will then keep output phase as far as possible
The stabilization of difference, while reducing Insertion Loss；Second level power pre-amplification circuit is by an interstage matched transformer, a pre-amplification power
Circuit is constituted, and the grid and first order power of pre-amplification power circuit prevent the current-mode power distribution transformer in big circuit
Secondary side connect, output drain electrode and the primary side of interstage matched transformer connect, the two of secondary side and the main power amplification circuit of output stage
The input of order harmonics control circuit connects.In this example, this level-one pre-amplification stage can provide 15dB gain, while implement
During, it can also be made it possible to according to the demand of the main amplifying power circuit of last output stage, constantly adjustment breadth length ratio as output stage
Main power amplification circuit provides enough linear power inputs, since the output power of last main power-amplifier stage is larger, circuit
Parasitic capacitance it is larger, gain is lower, therefore the linear power output of pre-amplification power circuit also can be higher.The main power of output stage
Amplifying circuit, i.e. eight road power combing harmonic controling power amplification circuits are by power amplification circuit, 8 road current-voltage modes
Power combing 1:2 transformer, second order and three order harmonics control circuits are constituted.The input of the second harmonic control circuit and the second level
The secondary side of the interstage matched transformer of power pre-amplification circuit connects, and the grid of output and main power amplification circuit connects, main function
The primary side of the power combing 1:2 transformer of the output drain electrode and 8 road current-voltage modes of rate amplifying circuit connects, secondary side and three
The input of order harmonics control circuit connects, and the output of three order harmonics control circuits and antenna connect, and is the output of radiofrequency signal.
The concrete structure diagram of eight road power combing harmonic controling power amplification circuit of Tu2Shi, puts in advance from second level power
The signal of big circuit enters from VIN_N+, VIN_N-, VIN_P+, VIN_P- respectively, and by the second harmonic control circuit, second order is humorous
Wave control circuit by a resonance at the second harmonic, carry out matched capacitor and inductor series network at fundamental wave and constitute, not only
Play the role of impedance matching, forms resonance with the secondary side inductance of the interstage matched transformer of second level power pre-amplification circuit
Network, while also high-order harmonic wave is filtered, then signal enters in power amplification unit, and signal is divided into two at this time
Branch, while entering main amplification branch, and auxiliary amplification branch, in this example, in order to solve the problems, such as gain compression, by two
A branch is biased in different types, while being constantly adjusted to breadth length ratio, so that enters in terms of VIN_N, VIN_P is equivalent
Input capacitance can also become relatively stable in the case where big signal, so that the non-linear of circuit is reduced, then from power
The signal that amplifying unit comes out, in the power combing 1:2 transformer for entering 8 road current-voltage modes.
Fig. 3 is the power combing 1:2 transformer concrete structure diagram of 8 road current-voltage modes, wherein the line width of transformer,
Spacing, internal diameter be all by constantly adjusting, it is minimum in the hope of the insertion loss at fundamental wave so that the efficiency highest of power combing, 8
Four primary sides (P_1, P_2, P_3, P_4) of the power combing 1:2 transformer of road current-voltage mode are separately connected four power
Amplifying unit, the difference output of power amplification unit flow directly into the power combing 1:2 transformer of 8 road current-voltage modes,
Then pass through secondary side S_1 final output, it can be seen that two groups of primary side P_1 and P_2, primary side P_3 and P_4 coils are to intercouple
, such coupling does not interfere with output power, because all power cells, are at open state from the beginning
, the electric current between coil and coil does not have obstruction, is conducive to the inductance value for improving primary coil instead, increases and secondary side
The coefficient of coup, and P_1 and P_3, P_2 and P_4 are adjacent in this way, the opposite coil of magnetic induction line, then due to mutual distance
It farther out, can't be to generating large effect each other.Moreover, transformer is 1:2 turn ratio, can be much smaller than in the electric current of secondary side
In the electric current of primary side, can thus power signal be being reduced in the decaying of secondary side；Due to being first voltage mode, then current-mode
Reason, be assigned to the equivalent load impedance of each power amplification unit be it is almost equivalent with the transformer of 1:1, gap is only
Only on the coefficient of coup, thus for each power amplification unit, the difficulty of impedance matching is greatly lowered, while
Output power is enabled to obtain very big promotion.Finally, the power signal of tetra- coils of P_1, P_2, P_3, P_4, is coupled to
On S_1, using a three order harmonics control units in Fig. 2, it is output to loaded antenna end and goes.
Fig. 4 is emulated using the harmonic wave of the radio-frequency power amplifier of eight road power combing harmonic controling CMOS power amplification circuits
Figure.Wherein, what horizontal axis represented is the size of input power, and what red curve represented is the size of output power, blue curve generation
Table be corresponding drain added efficiency at this time size.It can be seen that the output power of P1dB has 34.7dBm, drain is additional
Efficiency has 41.3%, and maximum output has 36.31dBm, and drain added efficiency at this time has 47.2%, eight road power combing harmonic waves
Control power amplification circuit produces very high linear power output and maximum power output, while efficiency is also quite high.
Claims (2)
1. a kind of eight road power combings suitable for RF power amplification have harmonic controling power amplification circuit, which is characterized in that by
Following three parts are constituted: first order power pre-amplification circuit, second level power pre-amplification circuit and the main power amplification of output stage
Circuit, in which:
The first order power pre-amplification circuit is by an input matching transformer, a main offer gain and guarantees the linearity
Pre-amplification power circuit and current-mode power distribution transformer constitute, provide enough inputs for subsequent circuit
Power；The primary side of input matching transformer is the input of radiofrequency signal, and secondary side and the grid for preventing high-power circuit connect, prevent
The output drain electrode of high-power circuit and the primary side of current-mode power distribution transformer connect, current-mode power distribution transformer
Secondary side and second level power prevent the grid of the pre-amplification power circuit in big circuit and connect；Radiofrequency signal becomes from input matching
The primary side of depressor enters, and by the coupling of transformer, comes out from secondary side, subsequently enters the grid of pre-amplification power circuit, passes through
It after amplification, is come out from the drain electrode of pre-amplification power circuit, into the primary side of current-mode power distribution transformer, by coupling
It closes, is come out from secondary side, into the grid of pre-amplification power circuit in the power pre-amplification circuit of the second level；
The second level power pre-amplification circuit is made of an interstage matched transformer, a pre-amplification power circuit；It puts in advance
The secondary side that the grid and first order power of high-power circuit prevent the current-mode power distribution transformer in big circuit connects, defeated
It drains out and the primary side of interstage matched transformer connects, the second harmonic control circuit of secondary side and the main power amplification circuit of output stage
Input connect；The secondary side of the interstage matched transformer of the input and second level power pre-amplification circuit of the second harmonic control circuit
Connect, the grid of output and main power amplification circuit connects, the output drain electrode of main power amplification circuit and 8 road current-voltage moulds
The primary side of the power combing 1:2 transformer of formula connects, and the input of secondary side and three order harmonics control circuits connects, the control of three order harmonics
The output of circuit and antenna connect, and are the output of radiofrequency signal, and the signal from first order power pre-amplification circuit is from pre-amplification
The grid of power circuit enters, and after amplification, comes out from drain electrode, into the primary side of interstage matched transformer, through overcoupling,
It is come out from secondary side, into the harmonic controling circuit in the main power amplification circuit of output stage；
The main power amplification circuit of output stage is by power amplification circuit, the power combing 1:2 transformation of 8 road current-voltage modes
Device, second order and three order harmonics control circuits are constituted, and power amplification circuit is divided into two parts: main power amplifying part and auxiliary are put
Most of, each part is made of capacitance, biasing resistor, NMOS power tube；Harmonic controling circuit by phase mutual resonance electricity
The power combing 1:2 transformer of sense and capacitor composition, 8 road current-voltage modes is become by 4 road power combings of two current-modes
Depressor is connected in series；The signal that power prevents big circuit from the second level enters from harmonic controling circuit, after filtering,
The grid for entering back into main power amplification circuit comes out, into the power of 8 road current-voltage modes after amplification from drain electrode
The primary side for synthesizing 1:2 transformer exports, using harmonic controling circuit, final output to antenna through overcoupling from secondary side.
2. eight road according to claim 1 power combing has harmonic controling power amplification circuit, which is characterized in that its work
Make process are as follows: in the first order power amplification circuit, radiofrequency signal enters from the primary side of input matching transformer, by coupling
It closes, is come out from secondary side, subsequently enter the grid of pre-amplification power circuit, after amplification, from the leakage of pre-amplification power circuit
Pole comes out, and into the primary side of current-mode power distribution transformer, process is transformer coupled, comes out from secondary side；Enter second
The grid that grade power prevents the prevention high-power circuit in big circuit comes out, second level power pre-amplification by amplification from drain electrode
The output end of circuit is connected with the input terminal of eight road power combing harmonic controling amplifying circuits, radiofrequency signal from VIN_N+,
VIN_N-, VIN_P+, VIN_P- enter eight road power combing harmonic controling power amplification circuits, control electricity by the second harmonic
Road after decaying to the second harmonic component in input signal, enters in the main power amplification circuit of output stage, in power
In amplifying unit, enter from VIN_N and VIN_P, while amplifying by main power amplification and auxiliary power, the two parts difference
Signal is amplified, and inhibits the generation of second harmonic and triple-frequency harmonics, while making up main power amplification in high output work
The gain reduction generated when rate reduces AM-AM distortion；Last signal is exported from the both ends VOUT_N and VOUT_P, enters 8 tunnels
In the power combing 1:2 transformer of current-voltage mode, after by power combing, signal out finally passes through three ranks
Harmonic controling circuit, after decaying to three order harmonic components in signal, final output.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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| CN117639806A (en) * | 2023-11-03 | 2024-03-01 | 锐石创芯(深圳)科技股份有限公司 | Radio frequency front end module and communication device |
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| CN117639806A (en) * | 2023-11-03 | 2024-03-01 | 锐石创芯(深圳)科技股份有限公司 | Radio frequency front end module and communication device |
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