CN103872992A - 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
- CN103872992A CN103872992A CN201210527852.7A CN201210527852A CN103872992A CN 103872992 A CN103872992 A CN 103872992A CN 201210527852 A CN201210527852 A CN 201210527852A CN 103872992 A CN103872992 A CN 103872992A
- 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.)
- Granted
Links
Images
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 has about a kind of radio-frequency power amplifier, and particularly about a kind of radio-frequency power amplifier that utilizes output current to compensate power output.
Background technology
In Cell Phone Design concept of new generation, power added efficiency (Power Added Efficiency while not only requiring peak power output, PAE), no matter more emphasize simultaneously high, in or also can have higher PAE when low power output, so that the longer air time to be provided.The linearities of gain, power output ability and the prime PA of the suitable Modulating Power amplifier (PowerAmplifier, PA) of warp etc., not only can reduce outside average consumed cur-rent, can extend the air time simultaneously.In the prior art, PA is using after DC-DC converter (DC-to-DC converter), PA not only in the time of high-output power its current drain lower, simultaneously in, current drain when low power output reduces too, to improve the PAE of whole section of power output.
Tradition is applied to switching power amplifier (Switch Mode Power Amplifier) in 3G/4G wireless system though framework provides good service efficiency.But, wish there is longer air time demand in the face of consumer, particularly wish in, under low output power mode, also can reach than traditional suitching type PA greater efficiency and low current consumption characteristic, may become a problem to be solved.
Summary of the invention
The object of the present invention is to provide a kind of radio-frequency power amplifier, radio-frequency power amplifier comprises output-stage circuit, exponential type bias circuit and voltage-current converter circuit.Output-stage circuit receives the first system voltage and output one output current.Exponential type bias circuit is coupled to output-stage circuit, described exponential type bias circuit is by coupling second system voltage to receive bias current, between bias current and output current, be wherein exponential relationship, and in the time that bias current is zero current, output current is zero current.Voltage-current converter circuit couples exponential type bias circuit to receive the first electric current, and voltage-current converter circuit is that the second electric current is to make between output current and the first system voltage as exponential relationship by received the first system voltage transitions.Bias current equals the multiple of the first electric current and the second electric current summation.
In one embodiment, the 3rd electric current that wherein voltage-current converter circuit transmits positive temperature coefficient according to the second electric current of the first electric current of positive temperature coefficient and negative temperature coefficient, to exponential type bias circuit, makes bias current and output current equal or approach the electric current of zero-temperature coefficient by this.
In one embodiment, output-stage circuit comprises output transistor.
In one embodiment, when the 4th electric current in exponential type bias circuit equals the 5th electric current, bias current presents exponential relationship with respect to output current, and in the time that bias current increases progressively, output current exponential type rises.
In one embodiment, the 5th transistor AND gate the 6th transistor in voltage-current converter circuit forms the second current mirror, and output current presents exponential relationship with respect to the first system voltage, in the time that the first system voltage increases progressively, output current exponential type rises, by this to compensate the power output of output transistor.
Electronic system, radio-frequency power amplifier and output power back off method thereof that the embodiment of the present invention proposes, exponential relationship by output current with respect to the first system voltage, make when the first system voltage is under proper range changes, the characteristic that can rise by the exponential type of output current compensates the dynamic range of power output.Moreover the radio-frequency power amplifier of this disclosure can reach secondary power efficiency preferably and reach the electricity-saving function of low stream consumption under low power output, meet consumer and wish the demand of longer air time.
For enabling further to understand feature of the present invention and technology contents, refer to following about detailed description of the present invention and accompanying drawing, but these explanations and appended graphic the present invention that are only used for illustrating but not are done any restriction to claim scope of the present invention.
Accompanying drawing explanation
Explain specific embodiments of the invention with reference to alterations above, by this can be more clear to the present invention, the plurality of graphic in:
Fig. 1 is according to the circuit blocks figure of the radio-frequency power amplifier of the embodiment of the present invention.
Fig. 2 is the physical circuit figure according to the radio-frequency power amplifier of the embodiment of the present invention.
Fig. 3 is the simulation curve figure according to the output current of the embodiment of the present invention and biascurrent relationship.
Fig. 4 is according to the simulation curve figure of the first system voltage of the embodiment of the present invention and output current relation.
Fig. 5 is according to the simulation curve figure of the first system voltage of the embodiment of the present invention and power output relation.
Fig. 6 is according to the block diagram of the electronic system of the embodiment of the present invention.
Fig. 7 is according to the flow chart of the output power back off method of 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: the first electric capacity
C2: the second electric capacity
GND: earthed voltage
I1: the first electric current
I2: the second electric current
I3: the 3rd electric current
I4: the 4th electric current
I5: the 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 voltage
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
Embodiment
Below will be referring to the various exemplary embodiments of graphic description, concept of the present invention may embody with multi-form, should not be construed as and is limited to the exemplary embodiments set forth herein.
Please refer to Fig. 1, Fig. 1 is according to the circuit blocks figure of the radio-frequency power amplifier of the embodiment of the present invention.Radio-frequency power amplifier 100 comprises output-stage circuit 110, exponential type bias circuit 120 and voltage-current converter circuit 130.Output-stage circuit 110 couples 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 output one output current.Exponential type bias circuit 120 provides a voltage bias VB to output-stage circuit 110 by being coupled to second system voltage VSS to receive bias current IBA and exponential type bias circuit 120, and wherein, in the time that bias current IBA is zero current, output current is zero current.Voltage-current converter circuit 130 receives the first electric current I 1, and wherein the first electric current I 1 is for to feed back to voltage-current converter circuit 130 from exponential type bias circuit 120.Voltage-current converter circuit 130 is converted to the second electric current I 2 so that bias current IBA is proportional to the first system voltage VCC by received the first system voltage VCC, and then makes to compensate for exponential relationship between output current and the first system voltage VCC the dynamic range of power output.Bias current IBA equals the multiple of the first electric current I 1 and the second electric current I 2 summations, and designer can further be designed according to its practical application request.
In addition, the first electric current I 1 is that positive temperature coefficient and the second electric current I 2 are negative temperature coefficient, and the 3rd electric current I 3 that voltage-current converter circuit 13 transmits positive temperature coefficient according to the first electric current I 1 and the second electric current I 2 is to exponential type bias circuit 120, makes by this bias current IBA and output current equal or approach 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 between its physical quantity (as magnitude of voltage, current value or resistance value) and temperature proportional, the negative temperature coefficient relation that represents to be inversely proportional between its physical quantity and temperature, zero-temperature coefficient represents between its physical quantity (as magnitude of voltage, current value or resistance value) and temperature separate, namely, in the time of temperature rise or decline, its physical quantity can't rise along with temperature or decline.
Continue referring to Fig. 1, in the present embodiment, radio-frequency power amplifier 100 uses one to provide the first system voltage VCC to the metastable DC-DC converter of temperature (Fig. 1 does not illustrate), high efficiency and the low-power consumption that can make the output power range of radio-frequency power amplifier 100 all be consistent.Can be known by inference by equation (1), if when the first system voltage VCC operates in 0.5～3.5V interval, the dynamic range that the first system voltage VCC can power output is contributed about 8dB.Wherein P is power output, and I is that output current and V are the first system voltage.Because the standard of the radio-frequency power amplifier that is applied to the third generation (3G)/4th generation (4G) wireless system all requires the power output of radio-frequency power amplifier 100 must have the dynamic range of 30dB.But, if only the dynamic range of power output is provided to about 30dB left and right by the first system voltage VCC, not only unrealistic but also do not meet current to the requirement between the operating space of system voltage.
P=I×V (1)
Therefore the output current that, utilization of the present invention can be adjusted provides the required dynamic range of another part of power output.By the first system voltage VCC is fed back to voltage-current converter circuit 130, so that output current presents exponential relationship with respect to the first system voltage VCC, therefore can make the first system voltage VCC maintain reasonable operation interval, and when in the situation that the first system voltage VCC increases progressively, radio-frequency power amplifier 100 more can make output current present the characteristic that exponential type rises, so that the contribution of dynamic range to be provided.Wherein, exponential type bias circuit 120 is by coupling second system voltage VSS to receive bias current IBA, and exponential type bias circuit 120 provides a voltage bias VB to output-stage circuit 110, make accordingly to there is an exponential relationship between bias current IBA and the output current of output-stage circuit 110.Separately, in the time that bias current IBA is zero current, the output current of radio-frequency power amplifier 100 can be zero current, to reduce the power dissipation of radio-frequency power amplifier 100.
Please refer to Fig. 2, the circuit diagram that Fig. 2 is another embodiment of the present invention.Different from above-mentioned Fig. 1 embodiment, in the present embodiment, output-stage circuit 110 comprises output transistor M1.Exponential type bias circuit 120 comprises the first resistance R 1, the first transistor Q1, transistor seconds Q2, the second resistance R 2, the 3rd transistor Q3, the 4th transistor Q4 and the 5th transistor Q5.Voltage-current converter circuit 130 comprises the 3rd resistance R 3, the four resistance R 4 and the 6th transistor Q6.
The collector of output transistor M1 and emitter-base bandgap grading receive respectively the first system voltage VCC and earthed voltage GND, and the voltage bias VB that its base stage reception exponential type bias circuit 120 provides is to receive a bias voltage input current (that is base current).One end of the first resistance R 1 couples second system voltage VSS.The collector of the first transistor Q1 and base stage couple respectively the other end of second system voltage VSS and the first resistance R 1.Collector, base stage and the emitter-base bandgap grading of transistor seconds Q2 couples respectively the base stage of second system voltage VSS, the first transistor Q1 and the base stage of output transistor M1, and wherein the collector of transistor seconds Q2 reception the 4th electric current I 4 and its emitter-base bandgap grading provide the base stage of voltage bias VB to output transistor M1.One end of the second resistance R 2 couples the emitter-base bandgap grading of the first transistor Q1, and wherein bias current IBA is second resistance R 2 of flowing through.Collector, base stage and the emitter-base bandgap grading of the 3rd transistor Q3 couples respectively the other end of the first resistance R 1, the other end and the earthed voltage GND of the second resistance R 2, and wherein the collector of the 3rd transistor Q3 receives the 5th electric current I 5.Collector, base stage and the emitter-base bandgap grading of the 4th transistor Q4 couples respectively the base stage of output transistor M1, the other end and the earthed voltage GND of the second resistance R 2, and wherein the 3rd transistor Q3 and the 4th transistor Q4 form the first current mirror.The collector of the 5th transistor Q5 couples respectively the other end of the second resistance R 2, and its base stage couples current-to-voltage converting circuit 130 to receive the 3rd electric current I 3, wherein the 3rd electric current I 3 is for flowing to the base stage of the 5th transistor Q5 and the electric current that the 3rd electric current I 3 is positive temperature coefficient from the collector of the 6th transistor Q6.One end of the 3rd resistance R 3 couples the first system voltage VCC.One end of the 4th resistance R 4 couples the other end of the first resistance R 1, and its other end couples the other end of the 3rd resistance R 3.The other end, its emitter-base bandgap grading that the base stage of the 6th transistor Q6 and collector couple the 3rd resistance R 3 couple earthed voltage GND, and wherein the 6th transistor Q6 and the 5th transistor Q5 form the second current mirror.
Further illustrate the operation principle of radio-frequency power amplifier 200.
Because the first system voltage VCC is under between the operating space of 0.5V～3.5V, can only provide the power output dynamic range of radio-frequency power amplifier 200 about 8dB.Therefore, be under between the operating space of rational system voltage, the embodiment of the present invention provides with output current IO UT provides radio-frequency power amplifier 200 another part required power output dynamic range.In one embodiment, the standard of radio-frequency power amplifier now all requires the power output of radio-frequency power amplifier 200 must have the dynamic range of about 30dB, and therefore output current IO UT must provide the power output dynamic range of 22dB.
Radio-frequency power amplifier 200 utilization index type potential circuits 120 will be will make to have exponential relationship between bias current IBA and output current IO UT, as shown in equation (2), wherein Vt is that thermal voltage (thermalvoltage) and R4 are the resistance value of the 4th resistance.Then, radio-frequency power amplifier 200 utilizes voltage-current converter circuit that bias current IBA is converted to the first system voltage VCC, and as shown in equation (3), wherein R3 is the resistance value of the 3rd resistance.In conjunction with equation (2) and (3), can obtain equation (4), therefore can be by the first system voltage VCC under the increasing progressively of (that is 0.5V～3.5V) between operating space, can obtain the output current IO UT that exponential type rises.
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 summation of the base emitter voltage VBE3 of the base emitter voltage VBE1 of the first transistor Q1, the pressure drop of the second resistance R 2, the 3rd transistor Q3 equals the summation of the base emitter voltage VBE2 of transistor seconds Q2 and the base emitter voltage VBEM1 of output transistor M1, as shown in equation (5).The 3rd transistor Q3 and the 4th transistor Q4 form the first current mirror, if make the 4th electric current I 4 equal the 5th electric current I 5 by technological design, equation (5) can be derived and be obtained aforesaid equation (2).In other words, the exponential type bias circuit 120 of the present embodiment is coupled to second system voltage VSS to receive bias current IBA, and be coupled to the base stage of output transistor M1, the relation between output current IO UT and bias current IBA can be formed to an exponential relationship accordingly.
VBE1+(IBA×R2)+VBE3=VBE2+VBEM1 (5)
Fig. 3 is the simulation curve figure according to the output current of the embodiment of the present invention and biascurrent relationship.Fig. 3 is for reflecting the curve chart of equation (2), and trunnion axis is bias current IBA, and its unit is micromicroampere, and vertical axis is output current IO UT, and its unit is milliampere.In the time that bias current IBA is zero current, radio-frequency power amplifier 200 can cut out completely, that is the output current IO UT of radio-frequency power amplifier 200 is zero current, and then can reduce power consumption, meet consumer and wish to have the demand of longer air time.
Next, utilize the 3rd resistance R 3, the 4th resistance R 4 and the 6th transistor Q6 that the relation between voltage and electric current is changed mutually, be also converted to equation (3) by the bias current IBA in equation (2).The 3rd resistance R 3 in voltage-current converter circuit 130 receives the second electric current I 2 of feeding back from output-stage circuit 110, and the 4th resistance R 4 receives the first electric current I 1 of feeding back from exponential type bias circuit 120, the voltage that the voltage that wherein the first electric current I 1 is first node n1 deducts Section Point n2 is again divided by the resistance value of the 4th resistance R 4, and the second electric current I 2 is the voltage that the first system voltage VCC deducts Section Point n2, and the voltage of first node n1 is the summation of the base emitter voltage VBE2 of transistor seconds Q2 and the base emitter voltage VBEM1 of output transistor M1, the voltage of Section Point n2 is the base emitter voltage VBE6 of the 6th transistor Q6.The first electric current I 1 is as shown in equation (6), and the second electric current I 2 is as shown in equation (7).
I1=(VBE2+VBEM1-VBE6)/R4 (6)
I2=(VCC-VBE6)/R3 (7)
Next, suppose that the base emitter voltage VBE2 of transistor seconds Q2 equals the base emitter voltage VBEM1 of output transistor M1.From equation (6) and (7), the electric current that the first electric current I 1 is positive temperature coefficient, the electric current that the second electric current I 2 is negative temperature coefficient, and the summation of the first electric current I 1 and the second electric current I 2 is the electric current of a positive temperature coefficient, be a negative temperature coefficient of degenerating with temperature rise in order to compensate the base emitter voltage of the 6th transistor Q6.Moreover, because the circuit topography framework of the 5th transistor Q5 and the 6th transistor Q6 is current mirror, therefore, in the time that the emitter-base bandgap grading area of the 5th transistor Q5 is N times of emitter-base bandgap grading area of the 6th transistor Q6, bias current IBA is doubly (IBA=N (I1+I2)) of N of the summation of the first electric current I 1 and the second electric current I 2.In the case of the emitter-base bandgap grading area of transistor Q5 and Q6 is identical, bias current IBA equals the summation of the first electric current I 1 and the second electric current I 2, as shown in equation (3), therefore bias current IBA can become by the resistance value adjustment of the 3rd resistance R 3 and the 4th resistance R 4 electric current of approaching or the temperature coefficient that equals zero, to compensate the temperature coefficient of bias current IBA.Known by equation (4), in the time that bias current IBA is the electric current of approaching or the temperature coefficient that equals zero, output current IO UT can be also the electric current of approaching or the temperature coefficient that equals zero, and therefore the voltage-current converter circuit 130 of this disclosure has effect of temperature-compensating.
In above-mentioned, the electric current that the 3rd electric current I 3 is positive temperature coefficient, and because the current gain (current gain) of the 5th transistor Q5 is negative temperature coefficient, therefore the collected current of the 5th transistor Q5 can be adjusted into the electric current of approaching or the temperature coefficient that equals zero.
Fig. 4 is according to the simulation curve figure of the first system voltage of the embodiment of the present invention and output current relation.Moreover Fig. 4 is the curve chart of reflection equation (4), trunnion axis is the first system voltage VCC, and its unit be volt, and vertical axis is output current IO UT, and its unit is milliampere.In the time increasing progressively between the operating space of the first system voltage VCC at 0.5V～3.5V, output current IO UT can present the characteristic that exponential type rises, and therefore the output current IO UT of the present embodiment can provide main contribution to the dynamic range of the power output of radio-frequency power amplifier 200.The first system voltage VCC provides the contribution of 8dB dynamic range between the operating space of 0.5V～3.5V, and output current IO UT can provide the contribution of 22dB dynamic range nearly, by this to compensate the power output of radio-frequency power amplifier 200.On practicing, designer can be according to its application demand, will adjust the size of output current IO UT by the resistance value of adjusting resistance R2 and R3, and then the power output of adjusting overall radio-frequency power amplifier 200 wants to reach dynamic range.
Fig. 5 is according to the simulation curve figure of the first system voltage of the embodiment of the present invention and power output relation, and trunnion axis is the first system voltage, and its unit is volt, and vertical axis is power output, and its unit is dBm.As shown in Figure 5, between the operating space in the first system voltage VCC at 0.5V～3.5V in, the highest dynamic range that can reach about 30dB of power output.Therefore designer is by the design of the bias circuit of the radio-frequency power amplifier 200 of this disclosure, can low, in high-power situation under, make radio-frequency power amplifier 200 can reach better output power range and power added efficiency (Power Added Efficiency preferably, PAE), wish to have the demand of longer air time to meet consumer.
In practice, output-stage circuit 110 can have more the first inductance L, the first capacitor C 1 and the second capacitor C 2.One end of the first capacitor C 1 couples the base stage of output transistor M1, and the other end of the first capacitor C 1 couples radio-frequency input signals RFIN.The first inductance L couples between the first system voltage VCC and the collector of output transistor M1.One end of the second capacitor C 2 is coupled to the collector of output transistor M1, the other end output radio frequency output signal RFOUT of the second capacitor C 2.
In the time that radio-frequency power amplifier 200 not yet starts received RF input signal RFIN, inductance L can present low impedance state to direct current signal, for example short circuit, and capacitor C 1, C2 can present high impedance status to direct current signal, for example, open circuit.In the time that radio-frequency power amplifier 200 starts received RF input signal RFIN, inductance L can present high impedance status to high-frequency signal, for example, open circuit, and capacitor C 1, C2 can present low impedance state to high-frequency signal, for example short circuit.Accordingly, radio-frequency power amplifier 200 can operate smoothly in DC operation pattern and alternate current operation pattern.
Fig. 6 is according to the block diagram of the electronic system of the embodiment of the present invention.Electronic system 600 comprises radio-frequency power amplifier 610 and load 620.Radio-frequency power amplifier 610 received RF input signal RFIN and output radio frequency output signal RFOUT be to load 620, that is radio-frequency power amplifier 610 coupling after first and second system voltage, can provide a stable power output to load 620.Radio-frequency power amplifier 610 can be one of them of radio-frequency power amplifier 100 and 200 in above-mentioned Fig. 1～Fig. 2 embodiment, and in order to provide stable power output to load 620.Electronic system 600 can be the system in various types of electronic installations, and 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 routine described method can be carried out at radio-frequency power amplifier shown in Fig. 1～Fig. 2, therefore please in the lump according to Fig. 1～Fig. 2 in order to understanding.
The method comprises the following steps: receive the first system voltage and output output current (step S710).Receive second system voltage and receive bias current (step S720).By exponential type bias circuit, make to present between bias current and output current exponential relationship (step S730).By voltage-current converter circuit, be the second electric current by the first system voltage transitions, so that present exponential relationship (step S740) between output current and the first system voltage.
Correlative detail about each step of the output power back off method of radio-frequency power amplifier describes in detail at above-mentioned Fig. 1～Fig. 5 embodiment, does not repeat for this reason at this.Should be noted that at this, only needs for convenience of description of each step of Fig. 7 embodiment, using the order of each step as restrictive condition.
In sum, electronic system, radio-frequency power amplifier and output power back off method thereof that the embodiment of the present invention proposes, exponential relationship by output current with respect to the first system voltage, make when the first system voltage is under proper range changes, the characteristic that can rise by the exponential type of output current compensates the dynamic range of power output.
The foregoing is only embodiments of the invention, it is not in order to limit to Patent right requirement scope of the present invention.
Claims (10)
1. a radio-frequency power amplifier, is characterized in that, this radio-frequency power amplifier comprises:
Output-stage circuit, receives the first system voltage and output output current;
Exponential type bias circuit, be coupled to this output-stage circuit, this exponential type bias circuit, by coupling second system voltage to receive bias current, is wherein exponential relationship between this bias current and this output current, and in the time that this bias current is zero current, this output current is zero current; And
Voltage-current converter circuit, couple this exponential type bias circuit to receive the first electric current, and this voltage-current converter circuit is that the second electric current is so that this bias current is proportional to this first system voltage by this received the first system voltage transitions, and then make between this output current and this first system voltage as exponential relationship
Wherein this bias current equals 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 characterized in that, this voltage-current converter circuit to this exponential type bias circuit, makes this bias current and this output current equal or approach the electric current of zero-temperature coefficient according to the 3rd electric current of this first electric current and this second electric current transmission positive temperature coefficient by this.
3. radio-frequency power amplifier as claimed in claim 2, is characterized in that, output-stage circuit comprises:
Output transistor, its collector couples this first system voltage, and its emitter-base bandgap grading couples earthed voltage, and its base stage receives the bias voltage that this exponential type bias circuit provides.
4. radio-frequency power amplifier as claimed in claim 3, is characterized in that, this exponential type bias circuit comprises:
The first resistance, 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 resistance;
Transistor seconds, its collector couples this second system voltage and receives the 4th electric current, and its base stage couples the base stage of this first transistor, and its emitter-base bandgap grading provides this to be biased into the base stage of this output transistor;
The second resistance, its one end couples the emitter-base bandgap grading of this first transistor, wherein this bias current this second resistance of flowing through;
The 3rd transistor, its collector couples the other end of this first resistance and receives the 5th electric current, and its base stage couples the other end of this second resistance, and its emitter-base bandgap grading couples this earthed voltage;
The 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 its emitter-base bandgap grading couples this earthed voltage, and wherein the 3rd transistor AND gate the 4th transistor forms the first current mirror; And
The 5th transistor, its collector couples the other end of this second resistance, and its base stage couples this current-to-voltage converting circuit to receive the 3rd electric current,
Wherein, when the 4th electric current equals the 5th electric current, this bias current presents exponential relationship with respect to this output current, and in the time that bias current increases progressively, output current exponential type rises.
5. radio-frequency power amplifier as claimed in claim 4, is characterized in that, this voltage-current converter circuit comprises:
The 3rd resistance, its one end couples this first system voltage and receives this second electric current, and wherein the 3rd resistance is in order to being this second electric current by this first system voltage transitions;
The 4th resistance, its one end couples the other end of this first resistance and receives this first electric current, and its other end couples the other end of the 3rd resistance; And
The 6th transistor, its base stage and collector couple the other end of the 3rd resistance, and its emitter-base bandgap grading couples this earthed voltage,
Wherein the 5th transistor AND gate the 6th transistor forms the second current mirror, and this output current presents exponential relationship with respect to this first system voltage, in the time that this first system voltage increases progressively, this output current exponential type rises, by this to compensate the power output of this output transistor.
6. radio-frequency power amplifier as claimed in claim 5, it is characterized in that, this first electric current is that first node voltage deducts Section Point voltage again divided by the resistance value of the 4th resistance, and this second electric current is that this first system voltage deducts this Section Point voltage again divided by the resistance value of the 3rd resistance
The summation of the base emitter voltage that wherein this first node voltage is this transistor seconds and the base emitter voltage of this output transistor, and the voltage of this Section Point is the 6th transistorized base emitter voltage.
7. an electronic system, for radio communication, is characterized in that, this electronic system comprises:
Radio-frequency power amplifier as claimed in claim 1, this radio-frequency power amplifier received RF input signal and output radio frequency output signal; And
Load, couples this radio-frequency power amplifier, and this load receives this radio frequency output signal.
8. electronic system as claimed in claim 7, it is characterized in that, this voltage-current converter circuit to this exponential type bias circuit, makes this bias current and this output current equal or approach the electric current of zero-temperature coefficient according to the 3rd electric current of this first electric current and this second electric current transmission positive temperature coefficient by this.
9. an output power back off method, is characterized in that, this output power back off method comprises:
Receive the first system voltage and output output current;
Receive second system voltage and receive bias current;
By exponential type bias circuit, make to present exponential relationship between this bias current and this output current; And
By voltage-current converter circuit, be the second electric current by this first system voltage transitions, so that present exponential relationship between this output current and this first system voltage.
10. output power back off method as claimed in claim 9, is characterized in that, in the time that this bias current is zero current, this output current is zero current,, wherein this bias current equals the multiple of this first electric current and this second electric current summation, 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 true CN103872992A (en) | 2014-06-18 |
| CN103872992B 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) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105042778A (en) * | 2015-07-14 | 2015-11-11 | 广东美的制冷设备有限公司 | Calculation method and system for PTC heating power and air conditioner |
| CN105302333A (en) * | 2014-06-08 | 2016-02-03 | 蒋国昌 | Input method and application thereof |
| CN106452378A (en) * | 2016-10-27 | 2017-02-22 | 锐迪科微电子（上海）有限公司 | Power control circuit for saturation power amplifier |
| CN107257233A (en) * | 2013-06-13 | 2017-10-17 | 日月光半导体制造股份有限公司 | Radio-frequency power amplifier |
| CN110808718A (en) * | 2018-08-06 | 2020-02-18 | 锐迪科创微电子（北京）有限公司 | High-stability radio frequency power amplifier |
Family Cites Families (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 |
| WO2002045253A1 (en) * | 2000-12-01 | 2002-06-06 | Mitsubishi Denki Kabushiki Kaisha | High-frequency amplifier |
| US6906592B2 (en) * | 2002-11-13 | 2005-06-14 | Qualcomm Inc | Continuously variable gain radio frequency driver amplifier having linear in decibel gain control characteristics |
| US7345526B2 (en) * | 2006-08-16 | 2008-03-18 | Mediatek Inc. | Linear-in-decibel current generators |
| CN101150329B (en) * | 2007-10-16 | 2011-03-16 | 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
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107257233A (en) * | 2013-06-13 | 2017-10-17 | 日月光半导体制造股份有限公司 | Radio-frequency power amplifier |
| 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 |
| CN105302333A (en) * | 2014-06-08 | 2016-02-03 | 蒋国昌 | Input method and application thereof |
| CN105302333B (en) * | 2014-06-08 | 2019-04-05 | 蒋国昌 | Input method and its application |
| CN105042778A (en) * | 2015-07-14 | 2015-11-11 | 广东美的制冷设备有限公司 | Calculation method and system for PTC heating power and air conditioner |
| 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 |
| CN106452378A (en) * | 2016-10-27 | 2017-02-22 | 锐迪科微电子（上海）有限公司 | Power control circuit for saturation power amplifier |
| 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 |
| CN110808718A (en) * | 2018-08-06 | 2020-02-18 | 锐迪科创微电子（北京）有限公司 | High-stability radio frequency 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 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103872992B (en) | 2017-02-08 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Roberts et al. | A 98nW wake-up radio for wireless body area networks | |
| CN103248319B (en) | A kind of low-power consumption oscillating circuit | |
| CN103872992A (en) | Electronic system, radio frequency power amplifier and output power compensation method thereof | |
| CN104793672A (en) | Low-dropout linear voltage regulator with high power supply rejection ratio | |
| CN207529257U (en) | GaN-HEMT power tube grid drain electrodes sequence of power switching protects biasing circuit | |
| TWI460988B (en) | Electronic system, rf power amplifier and output power compensation method thereof | |
| CN105322786A (en) | DC-DC converter | |
| KR20070096015A (en) | Broadband microwave amplifier | |
| CN115754457A (en) | Power amplifier's power detection circuitry | |
| EP2557681B1 (en) | Voltage driving apparatus for power amplifier, power amplifying system, power supply device for radio frequency power amplifier and communication device | |
| US9020456B2 (en) | Ultra-low-power radio for short-range communication | |
| CN103856172A (en) | Electronic system, radio frequency power amplifier and temperature compensation method of amplifier | |
| CN103178794A (en) | Single chip power amplifier | |
| CN103713679B (en) | A kind of LDO circuit based on discrete component | |
| CN209949056U (en) | Control circuit and signal receiving and transmitting device of GaN amplifier tube | |
| CN105656294A (en) | Step-down circuit in medium voltage and high voltage integrated circuit | |
| CN211744347U (en) | 5G radio frequency front end power switching chip compatible with APT and ET modes | |
| CN201623691U (en) | Voltage driving device and power amplification system of power amplifier | |
| CN203135799U (en) | Single-chip power amplifier | |
| CN204156825U (en) | Radio-frequency power amplifier | |
| Lee et al. | DC/DC converter controlled power amplifier module for WCDMA applications | |
| CN204681318U (en) | A kind of voltage transitions is the mutual conductance amplifying circuit of electric current | |
| Yuen et al. | A high efficiency, compact size, single die tri-mode PAM for 3G/4G handset applications | |
| Kumar et al. | Design and Implementation of a High Efficiency CMOS Power Amplifier for Wireless Communication at 2.45 GHz | |
| CN105281567A (en) | Low power consumption DC-DC converter |
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 |