CN103872992B - Electronic system, radio frequency power amplifier and output power compensation method thereof - Google Patents
Electronic system, radio frequency power amplifier and output power compensation method thereof Download PDFInfo
- Publication number
- CN103872992B CN103872992B CN201210527852.7A CN201210527852A CN103872992B CN 103872992 B CN103872992 B CN 103872992B CN 201210527852 A CN201210527852 A CN 201210527852A CN 103872992 B CN103872992 B CN 103872992B
- Authority
- CN
- China
- Prior art keywords
- current
- output
- voltage
- electric current
- transistor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Amplifiers (AREA)
Abstract
The invention discloses an electronic system, radio frequency power amplifier and output power compensation method thereof, and the radio frequency power amplifier comprises an output level circuit, an exponential type bias circuit and a voltage and current switching circuit. The output level circuit receives the first system voltage and outputs the output current. The exponential type bias circuit receives the bias current having exponential relationship with the output current, and the output current and the bias current are the zero current at the same time. The voltage and current switching circuit converts the received first system voltage into the second current so that the bias current is in direct proportion to the first system voltage, and the output current and the first system voltage have the exponential relationship. The bias current is the multiple of the sum of the first current and the second current.
Description
Technical field
The present invention is related to a kind of radio-frequency power amplifier, and compensates output especially with regard to one kind using output current
The radio-frequency power amplifier of power.
Background technology
In mobile phones design concept of new generation, do not require nothing more than power added efficiency (Power during peak power output
Added Efficiency, PAE), more emphasize simultaneously no matter high, in or also can have higher PAE during low output, to carry
For the longer air time.Through the suitable gain adjusting power amplifier (Power Amplifier, PA), output ability
And the linearity of prime PA etc., can not only reduce outside average consumed cur-rent, the air time can be extended simultaneously.In prior art
In, PA after using DC-DC converter (DC-to-DC converter), PA its electric current not only in high-output power
Consume relatively low, simultaneously in, low output when current drain similarly reduce, to improve the PAE of whole section of output.
Tradition is applied to switching power amplifier (the Switch Mode Power in 3G/4G wireless system
Amplifier) though framework provides good service efficiency.However, in the face of consumer wishes to longer air time demand,
Especially be desirable in, also can reach under low output power mode ratio traditional suitching type PA greater efficiency and low current consumption characteristic,
It is likely to become a problem to be solved.
Content of the invention
It is an object of the invention to provide a kind of radio-frequency power amplifier, radio-frequency power amplifier include output-stage circuit,
Exponential type bias circuit and voltage-current converter circuit.Output-stage circuit receives the first system voltage and exports electricity
Stream.Exponential type bias circuit is coupled to output-stage circuit, and described exponential type bias circuit is connect by coupling second system voltage
Receive bias current, be exponential relationship wherein between bias current and output current, and when bias current is for zero current, then defeated
Going out electric current is zero current.Voltage-current converter circuit couples exponential type bias circuit to receive the first electric current, and voltage x current
The first system being received voltage conversion is the second electric current so that between output current and the first system voltage by change-over circuit
For exponential relationship.Bias current is equal to the multiple of the first electric current and the second electric current summation.
In one embodiment, wherein voltage-current converter circuit is according to the first electric current of positive temperature coefficient and negative temperature coefficient
Second electric current transmit positive temperature coefficient the 3rd electric current to exponential type bias circuit, thereby make bias current and output current
Electric current equal or close to zero-temperature coefficient.
In one embodiment, output-stage circuit includes output transistor.
In one embodiment, when the 4th electric current in exponential type bias circuit is equal to the 5th electric current, then bias current is relative
Assume exponential relationship in output current, and when bias current is incremented by, then output current exponential type rises.
In one embodiment, the 5th transistor AND gate the 6th transistor in voltage-current converter circuit constitutes the second electric current
Mirror, and output current assumes exponential relationship with respect to the first system voltage, when the first system voltage is incremented by, then output current
Exponential type rises, thereby to compensate the output of output transistor.
Electronic system, radio-frequency power amplifier and its output power back off method that the embodiment of the present invention proposes, by defeated
Go out electric current with respect to the exponential relationship of the first system voltage so that working as the first system voltage under proper range change, Neng Goutong
Cross the dynamic range to compensate output for the characteristic that the exponential type of output current rises.Furthermore, the radio frequency work(of this disclosure
Rate amplifier can reach preferably power added efficiency under low output and reach the electricity-saving function of low current consumption, meet and disappear
Expense person wishes the demand of longer air time.
For enabling feature and the technology contents being further understood that the present invention, refer to below in connection with the present invention specifically
Bright and accompanying drawing, but these explanations and institute's accompanying drawings are only used for the present invention is described, rather than scope of the presently claimed invention is made
Any restriction.
Brief description
To explain the specific embodiment of the present invention with reference to alterations above, thereby can be more bright to the present invention
In vain, in the plurality of schema：
Fig. 1 is the circuit blocks figure of the radio-frequency power amplifier according to the embodiment of the present invention.
Fig. 2 is the physical circuit figure of the radio-frequency power amplifier according to the embodiment of the present invention.
Fig. 3 is the simulation curve figure of the output current according to the embodiment of the present invention and biascurrent relationship.
Fig. 4 is the simulation curve figure of the first system voltage according to the embodiment of the present invention and output current relation.
Fig. 5 is the simulation curve figure of the first system voltage according to the embodiment of the present invention and output relation.
Fig. 6 is the block diagram of the electronic system according to the embodiment of the present invention.
Fig. 7 is the flow chart of the output power back off method according to the embodiment of the present invention.
Wherein, description of reference numerals is as follows：
100、200：Radio-frequency power amplifier
110：Output-stage circuit
120：Exponential type bias circuit
130：Voltage-current converter circuit
600：Electronic system
610：Radio-frequency power amplifier
620：Load
C1：First electric capacity
C2：Second electric capacity
GND：Ground voltage
I1：First electric current
I2：Second electric current
I3：3rd electric current
I4：4th electric current
I5：5th electric current
IOUT：Output current
IBA：Bias current
L：Inductance
M1：Output transistor
n1、n2：Node
Q1～Q6：Transistor
R1～R4：Resistance
RFIN：Radio-frequency input signals
RFOUT：Radio frequency output signal
S710～S740：Step
VB：Bias
VBEM1：Base emitter voltage
VBE1：Base emitter voltage
VBE2：Base emitter voltage
VBE3：Base emitter voltage
VBE6：Base emitter voltage
VCC：The first system voltage
VSS：Second system voltage
Specific embodiment
Hereafter referring to schema, various exemplary embodiments will be described, concept of the present invention may embody, no in different forms
Should be interpreted that and be limited to exemplary embodiments set forth herein.
Refer to Fig. 1, Fig. 1 is the circuit blocks figure of the radio-frequency power amplifier according to the embodiment of the present invention.Radio-frequency power
Amplifier 100 includes output-stage circuit 110, exponential type bias circuit 120 and voltage-current converter circuit 130.Output-stage circuit
110 couple exponential type bias circuit 120.Exponential type bias circuit 120 is coupled between voltage-current converter circuit 130.Voltage
Current converter circuit 130 couples output-stage circuit 110 and receives the first system voltage VCC.
Output-stage circuit 110 receives the first system voltage VCC and exports an output current.Exponential type bias circuit 120
By being coupled to, second system voltage VSS receives bias current IBA and exponential type bias circuit 120 provides a voltage bias VB extremely
Output-stage circuit 110, wherein when bias current IBA is zero current, then output current is zero current.Voltage-current converter circuit
130 reception the first electric current I1, the wherein first electric current I1 is to feed back to voltage-current converter circuit from exponential type bias circuit 120
130.The first system being received voltage VCC is converted to voltage-current converter circuit 130 second electric current I2 so that bias current
IBA is proportional to the first system voltage VCC, and then makes to mend for exponential relationship between output current and the first system voltage VCC
Repay the dynamic range of output.Bias current IBA is equal to the multiple of the first electric current I1 and the second electric current I2 summation, makes designer
Can be designed further according to its practical application request.
Additionally, the first electric current I1 is positive temperature coefficient and the second electric current I2 is negative temperature coefficient, and Voltage to current transducer is electric
The 3rd electric current I3 of positive temperature coefficient is transmitted to exponential type bias circuit 120 according to the first electric current I1 and the second electric current I2 in road 13,
Bias current IBA and output current is thereby made to be equal or close to the electric current of zero-temperature coefficient.
Further illustrate the operation principle of radio-frequency power amplifier 100.
Positive temperature coefficient described in this disclosure represents its physical quantity (as magnitude of voltage, current value or resistance value) and temperature
Between proportional, negative temperature coefficient represents between its physical quantity and temperature that inversely, zero-temperature coefficient represents its thing
Reason amount (as magnitude of voltage, current value or resistance value) is separate and temperature between, that is, when temperature rises or falls, its thing
Reason amount can't rise or fall with temperature.
Continue referring to Fig. 1, in the present embodiment, radio-frequency power amplifier 100 is metastable to temperature using one
DC-DC converter (Fig. 1 does not illustrate), to provide the first system voltage VCC, can make the defeated of radio-frequency power amplifier 100
Go out high efficiency and the low-power consumption that power bracket is all consistent.Can be deduced by equation (1), if the first system voltage
VCC operate in 0.5～3.5V interval when, then the first system voltage VCC be capable of output dynamic range contribution about 8dB.
Wherein P is output, and for output current and V is the first system voltage to I.Due to being applied to the third generation (3G)/forth generation (4G)
The standard of the radio-frequency power amplifier of wireless system requires that the output of radio-frequency power amplifier 100 must have the dynamic of 30dB
State scope.But, if will only be provided left to about 30dB to the dynamic range of output by the first system voltage VCC
The right side, the not only unrealistic but also requirement that do not meet the current operating range to system voltage.
P=I × V (1)
Therefore, the dynamic model needed for the present invention provides another part of output using adaptable output current
Enclose.By the first system voltage VCC is fed back to voltage-current converter circuit 130, so that output current is with respect to the first system
Voltage VCC assumes exponential relationship, and the first system voltage VCC therefore can be made to maintain reasonable operation interval, and when first is
In the case that system voltage VCC is incremented by, radio-frequency power amplifier 100 more enables to the spy that output current assumes exponential type rising
Property, to provide the contribution of dynamic range.Wherein, exponential type bias circuit 120 is received by coupling second system voltage VSS partially
Current voltage IBA, and exponential type bias circuit 120 provides a voltage bias VB to output-stage circuit 110, makes bias current accordingly
There is between the output current of IBA and output-stage circuit 110 exponential relationship.Separately, when bias current IBA is zero current, then
The output current of radio-frequency power amplifier 100 can be zero current, to reduce the power dissipation of radio-frequency power amplifier 100.
Refer to Fig. 2, Fig. 2 is the circuit diagram of another embodiment of the present invention.From unlike above-mentioned Fig. 1 embodiment, this
In embodiment, output-stage circuit 110 includes output transistor M1.Exponential type bias circuit 120 includes first resistor R1, the first crystalline substance
Body pipe Q1, transistor seconds Q2, second resistance R2, third transistor Q3, the 4th transistor Q4 and the 5th transistor Q5.Voltage electricity
Stream change-over circuit 130 includes 3rd resistor R3, the 4th resistance R4 and the 6th transistor Q6.
The collector of output transistor M1 and emitter-base bandgap grading receive the first system voltage VCC and ground voltage GND respectively, and its base
The voltage bias VB that pole reception exponential type bias circuit 120 is provided is to receive a bias input current (that is, base current).The
One end of one resistance R1 couples second system voltage VSS.The collector of the first transistor Q1 and base stage are respectively coupled to second system electricity
Pressure VSS and the other end of first resistor R1.The collector of transistor seconds Q2, base stage and emitter-base bandgap grading are respectively coupled to second system voltage
The collector of the base stage of VSS, the base stage of the first transistor Q1 and output transistor M1, wherein transistor seconds Q2 receives the 4th electric current
I4 and its emitter-base bandgap grading provide voltage bias VB to the base stage of output transistor M1.One end of second resistance R2 couples penetrating of the first transistor Q1
Pole, wherein bias current IBA are to flow through second resistance R2.The collector of third transistor Q3, base stage and emitter-base bandgap grading are respectively coupled to first
The collector of the other end of resistance R1, the other end of second resistance R2 and ground voltage GND, wherein third transistor Q3 receives the 5th
Electric current I5.The collector of the 4th transistor Q4, base stage and emitter-base bandgap grading be respectively coupled to the base stage of output transistor M1, second resistance R2 another
One end constitutes the first current mirror with ground voltage GND, wherein third transistor Q3 and the 4th transistor Q4.5th transistor Q5's
Collector is respectively coupled to the other end of second resistance R2, and its base stage couples current-to-voltage converting circuit 130 to receive the 3rd electric current
I3, the wherein the 3rd electric current I3 are to flow to the base stage of the 5th transistor Q5 from the collector of the 6th transistor Q6 and the 3rd electric current I3 is
The electric current of positive temperature coefficient.One end of 3rd resistor R3 couples the first system voltage VCC.One end of 4th resistance R4 couples first
The other end of resistance R1, its other end couples the other end of 3rd resistor R3.The base stage of the 6th transistor Q6 and collector couple the
The other end of three resistance R3, its emitter-base bandgap grading couple ground voltage GND, the wherein the 6th transistor Q6 and the 5th transistor Q5 and constitute second
Current mirror.
Further illustrate the operation principle of radio-frequency power amplifier 200.
Because the first system voltage VCC is under the operating range of 0.5V～3.5V, radio-frequency power amplifier 200 can only be provided
The output dynamic range of about 8dB.Therefore, be under the operating range of rational system voltage, the embodiment of the present invention provides
To there is provided the output dynamic range needed for another part of radio-frequency power amplifier 200 with output current IO UT.In an enforcement
In example, the standard of radio-frequency power amplifier now requires that the output of radio-frequency power amplifier 200 must have about 30dB
Dynamic range, therefore output current IO UT have to provide 22dB output dynamic range.
Radio-frequency power amplifier 200 utilization index type potential circuit 120 will be will make bias current IBA and output current IO UT
Between there is exponential relationship, such as shown in equation (2), wherein Vt is thermal voltage (thermal voltage) and R4 is the 4th electricity
The resistance value of resistance.Then, bias current IBA is converted to using voltage-current converter circuit by radio-frequency power amplifier 200
One system voltage VCC, such as shown in equation (3), wherein R3 is the resistance value of 3rd resistor.In conjunction with equation (2) and (3), then
Can get equation (4), therefore can be incremental in operating range (that is, 0.5V～3.5V) by the first system voltage VCC
Under, you can obtain output current IO UT of exponential type rising.
IOUT=IBA × e^ [(IBA × R2)/Vt] (2)
IBA=VCC/R3 (3)
IOUT=IBA × e^ [(R2 × VCC)/(R3 × Vt)] (4)
Specifically, from Ke Xihefu law of conservation of energy, the base emitter voltage VBE1 of the first transistor Q1, second
The pressure drop of resistance R2, the summation of the base emitter voltage VBE3 of third transistor Q3 are equal to the base emitter voltage of transistor seconds Q2
The summation of the base emitter voltage VBEM1 of VBE2 and output transistor M1, such as shown in equation (5).Third transistor Q3 and the 4th
Transistor Q4 constitutes the first current mirror, if making the 4th electric current I4 be equal to the 5th electric current I5, equation by technological design
(5) aforesaid equation (2) can be derived by.In other words, the exponential type bias circuit 120 of the present embodiment is coupled to second and is
System voltage VSS is to receive bias current IBA, and is coupled to the base stage of output transistor M1, hereby it is possible to by output current
Relation between IOUT and bias current IBA forms an exponential relationship.
VBE1+ (IBA × R2)+VBE3=VBE2+VBEM1 (5)
Fig. 3 is the simulation curve figure of the output current according to the embodiment of the present invention and biascurrent relationship.Fig. 3 is to reflect
The curve chart of equation (2), trunnion axis be bias current IBA, its unit be micromicroampere, and vertical axises be output current
IOUT, its unit is milliampere.When bias current IBA is zero current, radio-frequency power amplifier 200 can completely close,
That is, output current IO UT of radio-frequency power amplifier 200 is zero current, and then power consumption can be reduced, meet consumer and wish
Prestige can have the demand of longer air time.
Next, being made between voltage and electric current using 3rd resistor R3, the 4th resistance R4 and the 6th transistor Q6
The mutual phase transformation of relation, also will be converted to equation (3) by the bias current IBA in equation (2).Voltage-current converter circuit
The second electric current I2 that 3rd resistor R3 reception in 130 is fed back from output-stage circuit 110, and the 4th resistance R4 reception is next
The the first electric current I1 being fed back from exponential type bias circuit 120, the wherein first electric current I1 are that the voltage of primary nodal point n1 deducts the
The voltage of the two node n2 resistance value divided by the 4th resistance R4 again, and the second electric current I2 deducts for the first system voltage VCC
The voltage of two node n2, and the voltage of primary nodal point n1 is the base emitter voltage VBE2 and output transistor M1 of transistor seconds Q2
Base emitter voltage VBEM1 summation, the voltage of secondary nodal point n2 is the base emitter voltage VBE6 of the 6th transistor Q6.First electricity
Shown in stream I1 such as equation (6), shown in the second electric current I2 such as equation (7).
I1=(VBE2+VBEM1-VBE6)/R4 (6)
I2=(VCC-VBE6)/R3 (7)
It is subsequently assumed that the base emitter voltage VBE2 of transistor seconds Q2 is equal to the base emitter voltage of output transistor M1
VBEM1.From equation (6) and (7), the first electric current I1 is the electric current of positive temperature coefficient, and the second electric current I2 is negative temperature system
The electric current of number, and the summation of the first electric current I1 and the second electric current I2 is the electric current of a positive temperature coefficient, brilliant in order to compensate the 6th
The base emitter voltage of body pipe Q6 is a negative temperature coefficient rising with temperature and degenerating.Furthermore, because the 5th transistor Q5 and
The circuit topography framework of six transistor Q6 is current mirror, therefore, when the emitter area of the 5th transistor Q5 is the 6th transistor Q6
N times of emitter area when, then bias current IBA is the first electric current I1 and N times of (IBA=N (I1+ of the summation of the second electric current I2
I2)).In the case of the emitter area identical of transistor Q5 and Q6, bias current IBA is equal to the first electric current I1 and the second electric current
The summation of I2, such as shown in equation (3), therefore bias current IBA can be by the resistance of 3rd resistor R3 and the 4th resistance R4
Value adjusts and becomes the electric current close or equal to zero-temperature coefficient, to compensate the temperature coefficient of bias current IBA.By equation
(4) understand, when the electric current that bias current IBA is close or equal to zero-temperature coefficient, then output current IO UT also can be close
Or it is equal to the electric current of zero-temperature coefficient, the voltage-current converter circuit 130 of therefore this disclosure has functions that temperature-compensating.
In above-mentioned, the 3rd electric current I3 is the electric current of positive temperature coefficient, and because the current gain of the 5th transistor Q5
(current gain) is negative temperature coefficient, and the collected current of the therefore the 5th transistor Q5 can be adjusted to close or equal to zero temperature
The electric current of degree coefficient.
Fig. 4 is the simulation curve figure of the first system voltage according to the embodiment of the present invention and output current relation.Furthermore, figure
4 is the curve chart of reflection equation (4), and trunnion axis is the first system voltage VCC, and its unit is volt, and vertical axises are defeated
Go out electric current IOUT, its unit is milliampere.When the first system voltage VCC is incremented by the operating range of 0.5V～3.5V, output
Electric current IOUT can assume the characteristic of exponential type rising, and therefore output current IO UT of the present embodiment can be to radio-frequency power amplifier
The dynamic range of 200 output provides main contribution.The first system voltage VCC carries in the operating range of 0.5V～3.5V
For the contribution of 8dB dynamic range, and output current IO UT can provide the contribution of nearly 22dB dynamic range, is thereby penetrated with compensating
The output of frequency power amplifier 200.On practicing, designer can be according to its application demand, by adjusting resistance
The resistance value of R2 and R3 will adjust the size of output current IO UT, and then adjusts the output of overall radio-frequency power amplifier 200
Power dynamic range to be reached.
Fig. 5 is the simulation curve figure of the first system voltage according to the embodiment of the present invention and output relation, trunnion axis
For the first system voltage, its unit is volt, and vertical axises are output, and its unit is dBm.As shown in Figure 5, in first
In the operating range of 0.5V～3.5V, output highest can reach the dynamic range of about 30dB to system voltage VCC.Therefore
The design by the bias circuit of radio-frequency power amplifier 200 of this disclosure for the designer, can low, in high-power
In the case of so that radio-frequency power amplifier 200 can reach more excellent output power range and preferably power added efficiency
(Power Added Efficiency, PAE), to meet the demand that consumer wishes to the longer air time.
In practice, output-stage circuit 110 can have more the first inductance L, the first electric capacity C1 and the second electric capacity C2.First electric capacity
One end of C1 couples the base stage of output transistor M1, and the other end of the first electric capacity C1 couples radio-frequency input signals RFIN.First electricity
Sense L couples between the first system voltage VCC and the collector of output transistor M1.One end of second electric capacity C2 is coupled to output crystal
The collector of pipe M1, the other end output radio frequency output signal RFOUT of the second electric capacity C2.
When radio-frequency power amplifier 200 not yet starts to receive radio-frequency input signals RFIN, inductance L to direct current signal can be in
Existing low impedance state, such as short circuit, and electric capacity C1, C2 then can assume high impedance status to direct current signal, such as open circuit.Work as radio frequency
When power amplifier 200 starts to receive radio-frequency input signals RFIN, inductance L can assume high impedance status to high-frequency signal, for example
Open circuit, and electric capacity C1, C2 then can assume low impedance state to high-frequency signal, such as short circuit.Accordingly, radio-frequency power amplifier 200
Smoothly can operate with alternate current operation pattern in DC operation pattern.
Fig. 6 is the block diagram of the electronic system according to the embodiment of the present invention.Electronic system 600 includes radio-frequency power amplifier
610 with load 620.Radio-frequency power amplifier 610 receives radio-frequency input signals RFIN and output radio frequency output signal RFOUT is extremely negative
Carry 620, that is, radio-frequency power amplifier 610, after coupling first and second system voltage, can provide a stable output
To load 620.Radio-frequency power amplifier 610 can be the radio-frequency power amplifier 100 and 200 in above-mentioned Fig. 1～Fig. 2 embodiment
One of, and in order to provide stable output to load 620.Electronic system 600 can be various types of electronics
System in device, electronic installation can be such as hand-held device or running gear etc..
Fig. 7 is the output power back off method according to the embodiment of the present invention.This example methods described can be in Fig. 1～Fig. 2 institute
The radio-frequency power amplifier execution shown, is therefore please understood with profit according to Fig. 1～Fig. 2 in the lump.
The method comprises the following steps：Receive the first system voltage and export output current (step S710).Receive the
Two system voltage and reception bias current (step S720).By exponential type bias circuit so that bias current and output current
Between assume exponential relationship (step S730).By voltage-current converter circuit, the first system voltage conversion is the second electric current,
So that assuming exponential relationship (step S740) between output current and the first system voltage.
With regard to the output power back off method of radio-frequency power amplifier each step correlative detail in above-mentioned Fig. 1～Fig. 5
Embodiment describes in detail, and here does not repeat for this reason.Here should be noted that, each step of Fig. 7 embodiment is only for convenience of description
Need, not using the order of each step as restrictive condition.
In sum, the embodiment of the present invention is proposed electronic system, radio-frequency power amplifier and its output power back off
Method, is become so that working as the first system voltage in proper range with respect to the exponential relationship of the first system voltage by output current
The dynamic range of output under change, can be compensated by the characteristic that the exponential type of output current rises.
The foregoing is only embodiments of the invention, it simultaneously is not used to limit to the scope of the patent claims of the present invention.
Claims (10)
1. a kind of radio-frequency power amplifier is it is characterised in that this radio-frequency power amplifier includes：
Output-stage circuit, receives the first system voltage and exports output current；
Exponential type bias circuit, is coupled to this output-stage circuit, this exponential type bias circuit by couple second system voltage with
Receive bias current, be exponential relationship wherein between this bias current and this output current, and when this bias current is zero electricity
During stream, then this output current is zero current；And
Voltage-current converter circuit, couples this exponential type bias circuit to receive the first electric current, and this Voltage to current transducer electricity
Road by this first system voltage conversion being received be the second electric current so that this bias current is proportional to this first system voltage, enter
And make to be exponential relationship between this output current and this first system voltage,
Wherein this bias current is equal to the multiple of this first electric current and this second electric current summation.
2. radio-frequency power amplifier as claimed in claim 1 it is characterised in that this voltage-current converter circuit according to this first
Electric current and this second electric current transmit the 3rd electric current of positive temperature coefficient to this exponential type bias circuit, thereby make this bias current
It is equal or close to the electric current of zero-temperature coefficient with this output current.
3. radio-frequency power amplifier as claimed in claim 2 is it is characterised in that output-stage circuit includes：
Output transistor, its collector couples this first system voltage, and its emitter-base bandgap grading couples ground voltage, and its base stage receives this exponential type
The bias that bias circuit is provided.
4. radio-frequency power amplifier as claimed in claim 3 is it is characterised in that this exponential type bias circuit includes：
First resistor, its one end couples this second system voltage；
The first transistor, its collector couples this second system voltage, and its base stage couples the other end of this first resistor；
Transistor seconds, its collector couples this second system voltage and receives the 4th electric current, and its base stage couples this first transistor
Base stage, its emitter-base bandgap grading provides this to be biased into the base stage of this output transistor；
Second resistance, its one end couples the emitter-base bandgap grading of this first transistor, and wherein this bias current flows through this second resistance；
Third transistor, its collector couples the other end of this first resistor and receives the 5th electric current, and its base stage couples this second electricity
The other end of resistance, its emitter-base bandgap grading couples this ground voltage；
4th transistor, its collector couples the base stage of this output transistor, and its base stage couples the other end of this second resistance, and it is penetrated
Pole couples this ground voltage, and wherein this third transistor and the 4th transistor constitute the first current mirror；And
5th transistor, its collector couples the other end of this second resistance, and its base stage couples this current-to-voltage converting circuit to connect
Receive the 3rd electric current,
Wherein when the 4th electric current is equal to the 5th electric current, then this bias current assumes exponential relationship with respect to this output current,
And when bias current is incremented by, then output current exponential type rises.
5. radio-frequency power amplifier as claimed in claim 4 is it is characterised in that this voltage-current converter circuit includes：
3rd resistor, its one end couples this first system voltage and receives this second electric current, and wherein this 3rd resistor was in order to should
The first system voltage conversion is this second electric current；
4th resistance, its one end couples the other end of this first resistor and receives this first electric current, and its other end couples the 3rd
The other end of resistance；And
6th transistor, its base stage and collector couple the other end of this 3rd resistor, and its emitter-base bandgap grading couples this ground voltage,
Wherein the 5th transistor AND gate the 6th transistor constitutes the second current mirror, and this output current with respect to this first is
System voltage assumes exponential relationship, and when this first system voltage is incremented by, then this output current exponential type rises, and is thereby somebody's turn to do with compensating
The output of output transistor.
6. radio-frequency power amplifier as claimed in claim 5 is it is characterised in that this first electric current deducts for primary nodal point voltage
The secondary nodal point voltage resistance value divided by the 4th resistance again, and this second electric current for this first system voltage deduct this second
The node voltage resistance value divided by this 3rd resistor again,
Wherein this primary nodal point voltage is the base emitter voltage with this output transistor for the base emitter voltage of this transistor seconds
Summation, and the voltage of this secondary nodal point is the base emitter voltage of the 6th transistor.
7. a kind of electronic system, for radio communication it is characterised in that this electronic system includes：
Radio-frequency power amplifier as claimed in claim 1, this radio-frequency power amplifier receives radio-frequency input signals and output is penetrated
Frequency output signal；And
Load, couples this radio-frequency power amplifier, this radio frequency output signal of this load-receipt.
8. electronic system as claimed in claim 7 it is characterised in that this voltage-current converter circuit according to this first electric current with
This second electric current transmits the 3rd electric current of positive temperature coefficient to this exponential type bias circuit, thereby makes this bias current defeated with this
Go out the electric current that electric current is equal or close to zero-temperature coefficient.
9. a kind of output power back off method is it is characterised in that this output power back off method includes：
Receive the first system voltage and export output current；
Receive second system voltage and receive bias current；
By exponential type bias circuit so that assuming exponential relationship between this bias current and this output current；And
Receive the first electric current, by voltage-current converter circuit, this first system voltage conversion is the second electric current, so that this is defeated
Go out and assume exponential relationship between electric current and this first system voltage；
Wherein this bias current is equal to the multiple of this first electric current and this second electric current summation.
10. output power back off method as claimed in claim 9 it is characterised in that when this bias current be zero current when, then
This output current is zero current, and this bias current is proportional to this first system voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210527852.7A CN103872992B (en) | 2012-12-10 | 2012-12-10 | Electronic system, radio frequency power amplifier and output power compensation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210527852.7A CN103872992B (en) | 2012-12-10 | 2012-12-10 | Electronic system, radio frequency power amplifier and output power compensation method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103872992A CN103872992A (en) | 2014-06-18 |
| CN103872992B true CN103872992B (en) | 2017-02-08 |
Family
ID=50911186
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210527852.7A Active CN103872992B (en) | 2012-12-10 | 2012-12-10 | Electronic system, radio frequency power amplifier and output power compensation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103872992B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107257233B (en) * | 2013-06-13 | 2020-10-30 | 日月光半导体制造股份有限公司 | Radio frequency power amplifier |
| CN104133527A (en) * | 2014-06-08 | 2014-11-05 | 蒋国昌 | Mobile phone computer, operating system, input device and application of mobile phone computer, operating system and input device |
| CN105042778B (en) * | 2015-07-14 | 2018-06-05 | 广东美的制冷设备有限公司 | The computational methods and its system and air conditioner of PTC heating powers |
| CN106452378B (en) * | 2016-10-27 | 2019-03-26 | 锐迪科微电子（上海）有限公司 | A kind of power control circuit of saturated power amplifier |
| CN110808718B (en) * | 2018-08-06 | 2023-07-14 | 锐迪科创微电子（北京）有限公司 | High-stability radio frequency power amplifier |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04278705A (en) * | 1991-03-07 | 1992-10-05 | Nec Corp | High frequency power amplifier |
| US5477188A (en) * | 1994-07-14 | 1995-12-19 | Eni | Linear RF power amplifier |
| CN1397106A (en) * | 2000-12-01 | 2003-02-12 | 三菱电机株式会社 | High-frequency amplifier and high-frequency mixer |
| CN1714505A (en) * | 2002-11-13 | 2005-12-28 | 高通股份有限公司 | Continuously variable gain radio frequency driver amplifier having linear in decibel gain control characteristics |
| CN101127512A (en) * | 2006-08-16 | 2008-02-20 | 联发科技股份有限公司 | Linear-in-decibel current generator and related changeable gain amplifier |
| CN101150329A (en) * | 2007-10-16 | 2008-03-26 | 络达科技股份有限公司 | Radio transceiver bias circuit |
| CN201805593U (en) * | 2010-08-12 | 2011-04-20 | 美凌微电子(上海)有限公司 | LED drive circuit with internal compensation, spread spectrum modulation, external frequency modulation and dimming functions |
-
2012
- 2012-12-10 CN CN201210527852.7A patent/CN103872992B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04278705A (en) * | 1991-03-07 | 1992-10-05 | Nec Corp | High frequency power amplifier |
| US5477188A (en) * | 1994-07-14 | 1995-12-19 | Eni | Linear RF power amplifier |
| CN1397106A (en) * | 2000-12-01 | 2003-02-12 | 三菱电机株式会社 | High-frequency amplifier and high-frequency mixer |
| CN1714505A (en) * | 2002-11-13 | 2005-12-28 | 高通股份有限公司 | Continuously variable gain radio frequency driver amplifier having linear in decibel gain control characteristics |
| CN101127512A (en) * | 2006-08-16 | 2008-02-20 | 联发科技股份有限公司 | Linear-in-decibel current generator and related changeable gain amplifier |
| CN101150329A (en) * | 2007-10-16 | 2008-03-26 | 络达科技股份有限公司 | Radio transceiver bias circuit |
| CN201805593U (en) * | 2010-08-12 | 2011-04-20 | 美凌微电子(上海)有限公司 | LED drive circuit with internal compensation, spread spectrum modulation, external frequency modulation and dimming functions |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103872992A (en) | 2014-06-18 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103872992B (en) | Electronic system, radio frequency power amplifier and output power compensation method thereof | |
| CN103248319B (en) | A kind of low-power consumption oscillating circuit | |
| CN103001463B (en) | Switch power controller and the Switching Power Supply that comprises this switch power controller | |
| CN103825558B (en) | Electronic system, power amplifier and temperature compensation thereof | |
| CN104734513B (en) | Power supply conversion device | |
| CN101521486A (en) | Power Amplifier Bias Circuit | |
| CN104793672A (en) | Low-dropout linear voltage regulator with high power supply rejection ratio | |
| CN102347780B (en) | Radio frequency receiving front-end circuit with adjustable gain | |
| CN103856172B (en) | Electronic system, radio frequency power amplifier and temperature compensation method of amplifier | |
| CN108664070A (en) | Low-power consumption temperature compensated current source circuit | |
| TWI460988B (en) | Electronic system, rf power amplifier and output power compensation method thereof | |
| CN104699158A (en) | Power supply circuit for constant current source | |
| CN106664026A (en) | Power supply unit adaptable for various power modes | |
| CN112383155B (en) | Small micropower wireless charging device based on magnetic resonance coupling | |
| CN204614195U (en) | The intelligent wireless instrument of a kind of band 485 communication functions | |
| CN203055147U (en) | Meter reading collector with switching power supply and power line carrier transceiving gain | |
| WO2021129794A1 (en) | Auxiliary control circuit for power amplification module, power amplification module, and communication device | |
| CN207135003U (en) | Active rectifier | |
| CN108417002A (en) | A kind of high-performance MBUS collectors for water meter | |
| CN204556022U (en) | A kind of temperature/humiditydetection detection system based on ZigBee | |
| CN103683461A (en) | Power supply switching system and method thereof | |
| CN105759102A (en) | Hall current sensor employing wireless signal output | |
| CN105656294A (en) | Step-down circuit in medium voltage and high voltage integrated circuit | |
| CN204156825U (en) | Radio-frequency power amplifier | |
| CN201708798U (en) | Repeater |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |