CN202634371U - Power amplifier with adjustable bias current - Google Patents
Power amplifier with adjustable bias current Download PDFInfo
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- CN202634371U CN202634371U CN 201220278344 CN201220278344U CN202634371U CN 202634371 U CN202634371 U CN 202634371U CN 201220278344 CN201220278344 CN 201220278344 CN 201220278344 U CN201220278344 U CN 201220278344U CN 202634371 U CN202634371 U CN 202634371U
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Abstract
The utility model discloses a power amplifier with adjustable bias current. The power amplifier comprises a driving stage amplification circuit and an output stage amplification circuit which are connected through an interstage impedance matching circuit, wherein the driving stage amplification circuit comprises a driving stage power tube, and a driving stage biasing circuit which provides adjustable bias current for the driving stage power tube by utilizing driving stage reference voltage and driving stage control voltage; and the output stage amplification circuit comprises an output stage power tube, and an output stage biasing circuit which provides adjustable bias current for the output stage power tube by utilizing output stage reference voltage and output stage control voltage. By the power amplifier, two biasing circuits with adjustable bias current are utilized, so that the power amplifier is in a low-power mode state with low bias current in the process of outputting low power and works in a high-power mode state at high bias current in the process of outputting high power; and therefore, the average efficiency of the power amplifier is improved.
Description
Technical field
The utility model relates to power amplifier, more particularly, relates to the adjustable power amplifier of a kind of bias current.
Background technology
As the core parts in the wireless communication system, the linearity, power output and the efficient of power amplifier (PA) is determining signal quality, communication distance and the stand-by time in the wireless system to a great extent.The design power amplifier; Primary work is to select suitable active device to be used for amplifying power; Because ambipolar heterojunction transistor (HBT) has higher gain, bigger current density and at the very strong power handling capability of high band, make HBT be more conducive to design radio-frequency power amplifier.SiGeHBT is used to the occasion of medium power output gradually in recent years, and reason is that the substrate pyroconductivity of SiGe HBT is big, helps reducing chip area, and the robustness of chip is good; The base-emitter cut-in voltage low (～0.75V), saturation voltage drop V
CE, SATLow, be applicable to low voltage operating; Current gain is relatively stable to temperature, can prevent the generation of thermal runaway effectively; Under high current densities, still can work power-performance and GaAs HBT comparable in reliability ground.
Generally, power amplifier has higher power added efficiency (PAE) when the output peak power, and along with the reduction of power output, efficient also reduces rapidly.And in practical application, power amplifier is in medium power output state in the most of the time, just is in the back-off operating state that efficient greatly reduces.Therefore, need provide a kind of power amplifier that can improve the efficient when medium power output to improve the average efficiency of radio system.
The utility model content
To existing power amplifier in practical application; The lower defective of efficient when being in medium power output state; Provide a kind of bias current adjustable power amplifier, efficient when improving medium power output, thus improve the average efficiency of power amplifier.
The technical scheme that the utility model adopts is: provide a kind of bias current adjustable power amplifier; Comprise driving stage amplifying circuit, output stage amplifier circuit and inter-stage impedance matching circuit; The signal output part of said driving stage amplifying circuit is connected with the signal input part of said output stage amplifier circuit through said inter-stage impedance matching circuit, and said driving stage amplifying circuit comprises:
Grounded emitter, collector electrode connect the driving stage power tube of power input; The driving stage reference voltage input terminal; The driving stage control voltage input terminal; Utilizing driving stage reference voltage and driving stage control voltage is the driving stage biasing circuit that said driving stage power tube provides adjustable bias current, and input received RF signal, output connect said driving stage power tube base stage, realize the input impedance matching circuit of sending-end impedance conversion;
The collector electrode of said driving stage power tube and the node between the power input are the signal output part of said driving stage amplifying circuit;
Said output stage amplifier circuit comprises:
Grounded emitter, collector electrode connect the output-stage power pipe of power input; The output stage reference voltage input terminal; The output stage control voltage input terminal; Utilizing output stage reference voltage and output stage control voltage is the output stage biased circuit that said output-stage power pipe provides adjustable bias current, and input connects the collector electrode of said output-stage power pipe, signal output part that output is said output stage amplifier circuit, realizes the output impedance match circuit of the impedance conversion of output.
The adjustable power amplifier of the bias current of the utility model; Said driving stage biasing circuit comprises: third and fourth transistor, the said third and fourth transistorized base stage connect respectively that said driving stage reference voltage input terminal all is connected power input with said driving stage control voltage input terminal, collector electrode, emitter is connected;
Said driving stage biasing circuit also comprises: the 5th transistor, first to the 3rd resistance and first electric capacity; Wherein, the filter circuit formed through said first electric capacity and first resistance of the said the 5th transistorized collector electrode base stage, grounded emitter, base stage that are connected to said third and fourth emitter through said the 3rd resistance and are connected to said driving stage power tube through said second resistance and second resistance base stage that is connected to said driving stage power tube.
The adjustable power amplifier of the bias current of the utility model; Said output stage biased circuit comprises: the 6th and the 7th transistor, and the said the 6th is connected respectively with the 7th transistorized base stage that said output stage reference voltage input terminal all is connected power input with said output stage control voltage input terminal, collector electrode, emitter is connected;
Said output stage biased circuit also comprises: the 8th transistor, the 4th to the 6th resistance and second electric capacity; Wherein, the filter circuit formed through said second electric capacity and the 4th resistance of the said the 8th transistorized collector electrode base stage, grounded emitter, base stage that are connected to the said the 6th and the 7th transistorized emitter through said the 6th resistance and are connected to said output-stage power pipe through said the 5th resistance and the 5th resistance base stage that is connected to said output-stage power pipe.
The adjustable power amplifier of the bias current of the utility model, said input impedance matching circuit comprise the 3rd electric capacity, the 4th electric capacity and first inductance; Wherein, said the 3rd electric capacity one termination is received the radiofrequency signal input, the other end is connected with the base stage of said driving stage power tube through said the 4th electric capacity, said first inductance, one end be connected in said third and fourth electric capacity and tie point, other end ground connection.
The adjustable power amplifier of the bias current of the utility model, said inter-stage impedance matching circuit comprises the 5th electric capacity, the 6th electric capacity and second inductance; Wherein, The collector electrode, the other end that said the 5th electric capacity one end connects said driving stage power tube connects the base stage of said output-stage power pipe through said the 6th electric capacity, and said second inductance, one end is connected in the said the 5th and tie point, the other end ground connection of the 6th electric capacity.
The adjustable power amplifier of the bias current of the utility model, said output impedance match circuit comprise the 3rd inductance, the 7th and the 8th electric capacity; Wherein, Said the 3rd inductance one end connects the collector electrode, the other end of said output-stage power pipe through said the 7th capacity earth, and tie point, the other end that said the 8th electric capacity one end is connected in said the 3rd inductance and said the 7th electric capacity are the signal output part of said output stage amplifier circuit.
The adjustable power amplifier of the bias current of the utility model, the ratio of the resistance of said first resistance and second resistance equal the ratio of driving stage power tube emitter area and the 5th emitter area;
The ratio of the resistance of said the 4th resistance and the 5th resistance equals the ratio of output-stage power pipe emitter area and the 8th emitter area.
Preferably, the emitter of said driving stage power tube and said output-stage power pipe is all through grounding through hole ground connection.
The adjustable power amplifier of the bias current of the utility model, said driving stage biasing circuit also comprises:
Be connected the 7th resistance between said the 3rd power tube base stage and the said driving stage reference voltage input terminal; And
Be connected the 8th resistance between said the 4th power tube base stage and the said driving stage control voltage input terminal.
The adjustable power amplifier of the bias current of the utility model, said output stage biased circuit also comprises:
Be connected the 9th resistance between said the 6th power tube base stage and the said output stage reference voltage input terminal; And
Be connected the tenth resistance between said the 7th power tube base stage and the said output stage control voltage input terminal.
The adjustable power amplifier of bias current that the utility model is realized has following beneficial effect: the driving stage biasing circuit utilizes constant driving stage reference voltage for the driving stage power tube bias current (situation of output stage biased circuit is corresponding identical with the driving stage biasing circuit) to be provided with adjustable driving stage control voltage; Particularly; When the power amplifier output high-power; Utilize driving stage and output stage reference voltage and driving stage and output stage control voltage bias current to be provided, make driving stage and output-stage power pipe be operated in the higher high-power mode state of bias current for driving stage and output-stage power pipe; When power amplifier output low-power, only utilize driving stage and output stage reference voltage bias current to be provided for driving stage and output-stage power pipe, make power amplifier be in the lower low-power mode state of bias current.The power amplifier of the utility model can either be biased in high-power mode as required; Thereby export higher power; Can regulate the size of bias current again according to the size adaptation ground of power output; Be operated in the higher low-power mode of efficient, thereby improved the average efficiency of power amplifier.
Description of drawings
Fig. 1 is the circuit diagram of power amplifier first embodiment of the utility model;
Fig. 2 is the circuit diagram of power amplifier second embodiment of the utility model;
Fig. 3 is the power output of power amplifier under the high-low power pattern and the curve chart of third order intermodulation distortion of the utility model;
Fig. 4 be the utility model power amplifier power added efficiency and increase the curve chart of ratio;
Fig. 5 is the circuit diagram of power amplifier the 3rd embodiment of the utility model.
Embodiment
Below in conjunction with accompanying drawing and embodiment the utility model is further explained.
Fig. 1 is the circuit diagram of power amplifier first embodiment of the utility model; As shown in Figure 1; The power amplifier of the utility model comprises driving stage amplifying circuit 100, output stage amplifier circuit 200 and inter-stage impedance matching circuit 300, and the signal output part of driving stage amplifying circuit 100 is connected through the signal input part of inter-stage impedance matching circuit 300 with output stage amplifier circuit 200.
Wherein, driving stage amplifying circuit 100 comprises: grounded emitter, collector electrode meet power input V
CCDriving stage power tube Q
1, driving stage reference voltage input terminal V
Ref1, driving stage control voltage input terminal V
Ctrl1, utilizing driving stage reference voltage and driving stage control voltage is said driving stage power tube Q
1The driving stage biasing circuit 110 of adjustable bias current is provided, and input received RF signal, output connect driving stage power tube Q
1Base stage, realize the input impedance matching circuit 120 of sending-end impedance conversion; Driving stage power tube Q
1Collector electrode and power input V
CCBetween node be the signal output part of driving stage amplifying circuit 100.
Output stage amplifier circuit 200 comprises: grounded emitter, collector electrode meet power input V
CCOutput-stage power pipe Q
2, output stage reference voltage input terminal V
Ref2, output stage control voltage input terminal V
Ctrl2, utilize output stage reference voltage and output stage control voltage to be output-stage power pipe Q
2The output stage biased circuit 210 of adjustable bias current is provided, and input connects output-stage power pipe Q
2Collector electrode, signal output part that output is output stage amplifier circuit 200, realize the output impedance match circuit 220 of the impedance conversion of output.
In the present embodiment, input impedance matching circuit 120 adopts the high pass filter structures, and signal that can the effective attenuation low-frequency range helps reducing low-frequency gain, improves the stability of low frequency.Input impedance matching circuit 120 has realized driving stage power tube Q
1To 50 ohm impedance conversion, form conjugate impedance match with input signal source, thereby realized maximum power transfer.Inter-stage impedance matching circuit 300 adopts the high pass filter structure; Help to improve the stability of power amplifier; Make the power amplifier of the utility model that the frequency band of relative broad is arranged again, help overcoming because the carrier deviation phenomenon that the fluctuation of integrated circuit technology causes.The signal output part of the power amplifier of the utility model adopts the output impedance match circuit 220 of low pass filter structure, has suppressed the high-frequency harmonic component in the output spectrum effectively, has improved the efficient and the linearity of amplifier.
In the present embodiment, the employing of the power amplifier of the utility model has the driving stage biasing circuit 110 of same circuits structure and the average efficiency that output stage biased circuit 210 improves power amplifier.These two biasing circuits can be regulated the bias current of control power amplifiers; Make power amplifier be in the lower low-power mode state of bias current during low-power, be in the higher high-power mode state of bias current during at output high-power, thereby improve the average efficiency of power amplifier in output.Said efficient refers to power added efficiency (PAE).
In the present embodiment, driving stage reference voltage that magnitude of voltage is constant and output stage reference voltage, the reference voltage when being two biasing circuit work.The power amplifier of the utility model is operated in low-power mode state following time, and these two reference voltages are used to set driving stage power tube Q
1With output-stage power pipe Q
2Bias current, provide by bandgap reference circuit.Driving stage control voltage and output stage control voltage can be regulated, and are the control voltage of selecting the power amplifier pattern, are that the base band control power amplifiers is in the high-power mode or the voltage control signal of low-power mode.For example; When adopting SiGe BiCMOS technological design power amplifier, when output stage control voltage was lower than 0.5V, output stage amplifier circuit 200 was in the low-power mode operating state; At this moment, output stage biased circuit 210 will utilize the output stage reference voltage to be output-stage power pipe Q
2Bias current is provided; Be in through control output stage control voltage and realize between the 1.7-2V that output stage amplifier circuit 200 is in the high-power mode operating state, at this moment, output stage biased circuit 210 will use output stage reference voltage and output stage to control voltage to be output-stage power pipe Q simultaneously
2Bias current is provided.Specifically output stage is controlled which magnitude of voltage that voltage is set among the 1.7-2V and need be decided according to actual conditions, like this, utilizes output stage reference voltage and output stage control voltage to be output-stage power pipe Q
2The bias current that provides is continuously adjustable.
The adjustable high efficiency 2.4GHz germanium of a kind of bias current silicon power amplifier that the SiGe BiCMOS technology that can be based on the power amplifier of the utility model realizes (example but be not used in restriction the utility model).This amplifier has adopted the adjustable biasing circuit of a kind of novel bias current; Make power amplifier when the output low-power, be in the lower low-power mode state of bias current; When output high-power, be operated in the higher high-power mode state of bias current; Realized regulating the size of bias current, thereby improved the average efficiency of power amplifier according to the size adaptation ground of power output.Under the 3.5V Power Supplies Condition, be operated in high-power mode under compare, when power amplifier was worked under low-power mode, its power added efficiency (PAE) had improved 56.7% in output during 0dBm, when output 20dBm, had improved 19.2%.
Fig. 2 is the circuit diagram of power amplifier second embodiment of the utility model, and is as shown in Figure 2, and in the present embodiment, driving stage biasing circuit 110 comprises: the third and fourth transistor Q
3And Q
4, the third and fourth transistor Q
3And Q
4Base stage connect driving stage reference voltage input terminal V respectively
Ref1With driving stage control voltage input terminal V
Ctrl1, collector electrode all connects power input V
CC, emitter is connected.
In the present embodiment, driving stage biasing circuit 110 also comprises: the 5th transistor Q
5, first to the 3rd resistance R
1To R
3And first capacitor C
1Wherein, the 5th transistor Q
5Collector electrode through the 3rd resistance R
3Be connected to third and fourth Q
3And Q
4Emitter and through second resistance R
2Be connected to driving stage power tube Q
1Base stage, grounded emitter, base stage through first capacitor C
1With first resistance R
1The filter circuit and second resistance R formed
2Be connected to driving stage power tube Q
1Base stage.
In the present embodiment, output stage biased circuit 210 comprises: the 6th and the 7th transistor Q
6And Q
7, the 6th and the 7th transistor Q
6And Q
7Base stage connect output stage reference voltage input terminal V respectively
Ref2With output stage control voltage input terminal V
Ctrl2, collector electrode all connects power input V
CC, emitter is connected.
In the present embodiment, output stage biased circuit 210 also comprises: the 8th transistor Q
8, the 4th to the 6th resistance R
4To R
6And second capacitor C
2Wherein, the 8th transistor Q
8Collector electrode through the 6th resistance R
6Be connected to the 6th and the 7th transistor Q
6And Q
7Emitter and through the 5th resistance R
5Be connected to output-stage power pipe Q
2Base stage, the 8th transistor Q
8Grounded emitter, base stage through second capacitor C
2With the 4th resistance R
4Filter circuit and the 5th resistance R formed
5Be connected to output-stage power pipe Q
2Base stage.
In the present embodiment, input impedance matching circuit 120 comprises the 3rd capacitor C
3, the 4th capacitor C
4With first inductance L
1Wherein, the 3rd capacitor C
3One termination is received radiofrequency signal input, the other end through the 4th capacitor C
4With driving stage power tube Q
1Base stage connect first inductance L
1One end is connected in third and fourth capacitor C
3And C
4Tie point, other end ground connection.
In the present embodiment, inter-stage impedance matching circuit 300 comprises the 5th capacitor C
5, the 6th capacitor C
6With second inductance L
2Wherein, the 5th capacitor C
5One end connects driving stage power tube Q
1Collector electrode, the other end through the 6th capacitor C
6Connect output-stage power pipe Q
2Base stage, second inductance L
2One end is connected in the 5th and the 6th capacitor C
5And C
6Tie point, other end ground connection.
In the present embodiment, output impedance match circuit 220 comprises the 3rd inductance L
3, the 7th and the 8th capacitor C
7And C
8Wherein, the 3rd inductance L
3One end connects output-stage power pipe Q
2Collector electrode, the other end through the 7th capacitor C
7Ground connection, the 8th capacitor C
8One end is connected in the 3rd inductance L
3With the 7th capacitor C
7Tie point, the other end be the signal output part of output stage amplifier circuit 200.
In the present embodiment, first resistance R
1With second resistance R
2The ratio of resistance equal driving stage power tube Q
1Emitter area and the 5th transistor Q
5The ratio of emitter area; The 4th resistance R
4With the 5th resistance R
5The ratio of resistance equal output-stage power pipe Q
2Emitter area and the 8th transistor Q
8The ratio of emitter area.
In the present embodiment, can also comprise and be connected in driving stage reference voltage input terminal V
Ref1With the 3rd transistor Q
3The 7th resistance R between the base stage
7, be connected in driving stage control voltage input terminal V
Ctrl1With the 4th transistor Q
4The 8th resistance R between the base stage
8, be connected in output stage reference voltage input terminal V
Ref2With the 6th transistor Q
6The 9th resistance R between the base stage
9, be connected in output stage control voltage input terminal V
Ctrl2With the 7th transistor Q
7The tenth resistance R between the base stage
10
For bipolar transistor; In order to compensate the variation of the PN junction cut-in voltage that causes owing to variation of temperature; The biasing circuit of current mirror form often is used to the bias power transistor, and this biasing circuit generally needs several milliamperes, even tens milliamperes electric current.In the biasing circuit of the utility model, be example with output stage biased circuit 210, the situation correspondence of driving stage biasing circuit 110 is identical.The 8th transistor (bias transistor) Q
8In the current density that flows through equal output-stage power pipe Q
2In current density, their V
BEIdentical, two power tubes have identical DC characteristic, during promptly with temperature or control change in voltage, and V
BEVariation identical.Suppose output-stage power pipe Q
2The middle electric current that needs is I
q, output-stage power pipe Q
2Emitter area be the 8th transistor Q
8S doubly, the current gain of two power tubes is β, the bias current I that then need from the output stage reference voltage source, extract
RefShown in (1) formula:
Because currentgain (> 130) and area than S (> 100) bigger; Only need from the output stage reference voltage source, extract tens microamperes bias current; Reduced the load capacity requirement to the output stage reference voltage source, the voltage fluctuation of output stage reference voltage source is also less to the influence of bias current simultaneously.In output stage biased circuit 210, the 4th resistance R
4With the 5th resistance R
5Be balance resistance, the 4th resistance R
4With the 5th resistance R
5Keep suitable ratio extremely important, this ratio will equal output-stage power pipe Q
2Emitter area to the 8th transistor Q
8The multiple of emitter area just will equal area and compare S.
Simultaneously, the 4th resistance R
4With the 5th resistance R
5With parallelly connected ground connection second capacitor C
2Constitute the RC network of low pass, stoped the RF signal to enter into output stage biased circuit 210 effectively, avoided of the influence of RF signal output stage biased circuit 210.When output stage control voltage was lower than 0.5V, power amplifier was in the low-power mode operating state, and output stage control voltage can not be with the 7th transistor Q
7Open the 7th transistor Q
7Can not be to the 8th transistor Q
8With output-stage power pipe Q
2Supplying electric current, only by the output stage reference voltage to the 8th transistor Q
8With output-stage power pipe Q
2Supplying electric current.When output stage control voltage was between the 1.7-2V, power amplifier was in the high-power mode operating state, and output stage control voltage is with the 7th transistor Q
7Open, the output stage reference voltage is with the 7th transistor Q
7After the unlatching, the 6th and the 7th transistor Q
6And Q
7Together to the 8th transistor Q
8With output-stage power pipe Q
2Supplying electric current.The 6th resistance R
6Be used for regulating to the 8th transistor Q
8With output-stage power pipe Q
2The size of output offset voltage.The the 4th and the 5th resistance R
4And R
5Be used to set the size of bias current.The operation principle of driving stage biasing circuit 110 is identical with output stage biased circuit 210.
In the present embodiment, power amplifier has adopted the two-stage, single-ended structure of common emitter, and except the radio frequency choke induction of collector electrode, the equal chip integration of all elements becomes.The signal input part of power amplifier adopts the 3rd capacitor C
3, first inductance L
1With the 4th capacitor C
4The input impedance matching circuit 120 of the T type of the high pass filter structure of forming helps reducing low-frequency gain, improves the stability of low frequency, sending-end impedance and driving stage power tube Q
1The input impedance conjugate impedance match so that dual-stage amplifier can access enough gains.The bandwidth and the stability influence of 300 pairs of power amplifiers of inter-stage impedance matching circuit are bigger, will pay special attention to during design, have adopted in the design by the 5th capacitor C
5, second inductance L
2With the 6th capacitor C
6The inter-stage impedance matching circuit 300 of the T type of the high pass filter structure of forming had both improved the stability of amplifier, made the amplifier of design that the frequency band of relative broad is arranged again, had overcome because the carrier deviation phenomenon that the fluctuation of technology causes.The signal output part of power amplifier has adopted by the 7th and the 8th capacitor C
7And C
8And the 3rd inductance L
3The output impedance match circuit 220 of the T type of the low pass filter structure that constitutes has suppressed the high-frequency harmonic component in the output spectrum effectively, has improved the linearity of amplifier.
Fig. 3 is the power output of power amplifier under the high-low power pattern and the curve chart of third order intermodulation distortion of the utility model; As shown in Figure 3; In the present embodiment; The power amplifier of the utility model, the 25.2dBm peak power output that for example can reach based on the power amplifier of SiGe BiCMOS technological design, this moment, power added efficiency reached 33%; This explanation SiGe BiCMOS technology is suitable for the power amplifier of design of High Efficiency rate, comprises that on the silica-based technology of low cost, realizing the SOC(system on a chip) (SoC) of power amplifier is significant.Use PAE
LPower added efficiency when the expression power amplifier is worked under low-power mode is used PAE
HThe power added efficiency of expression power amplifier when under high-power mode, working, so when exporting equal-wattage, the PAE under the low-power mode
LBe higher than PAE under the high-power mode
H, can define power amplifier PAE according to (2) formula and increase ratio (PAEIR):
Fig. 4 be the utility model power amplifier power added efficiency and increase the curve chart of ratio; As can beappreciated from fig. 4; Be operated in high-power mode under compare; When power amplifier was worked under low-power mode, power added efficiency PAE had improved 56.7% when output 0dBm, when output 20dBm, had improved 19.2%.The adjustable biasing circuit of bias current makes the power amplifier of the utility model can either export higher power; Can improve power amplifier operating efficiency of (medium power output state) in most of operating time again, thereby improve the average efficiency of power amplifier.
In the present embodiment, all the other situation are identical with first embodiment, repeat no more at this.
Fig. 5 is the circuit diagram of power amplifier the 3rd embodiment of the utility model, and is as shown in Figure 5, in this example, and driving stage power tube Q
1With output-stage power pipe Q
2Emitter through grounding through hole TWV ground connection.And, first inductance L in the input impedance matching circuit 120
1, second inductance L in the inter-stage impedance matching circuit 300
2With the 7th capacitor C in the output impedance match circuit 220
7All through grounding through hole TWV ground connection.Grounding through hole TWV greatly reduces the ground connection inductance of emitter, has improved transistorized high-frequency gain, is of value to designing high performance power amplifier.
In the present embodiment, all the other situation are identical with second embodiment, repeat no more at this.
In concrete implementation process, can carry out suitable improvement, to adapt to the specific requirement of concrete condition to the adjustable power amplifier of the bias current of the utility model.And the technical characterictic among each embodiment can use separately, also can make up use each other.Therefore be appreciated that the embodiment of the utility model just plays exemplary role, and be different from the protection range that limits the utility model.
Claims (10)
1. adjustable power amplifier of bias current; Comprise driving stage amplifying circuit (100), output stage amplifier circuit (200) and inter-stage impedance matching circuit (300); The signal output part of said driving stage amplifying circuit (100) is connected through the signal input part of said inter-stage impedance matching circuit (300) with said output stage amplifier circuit (200); It is characterized in that said driving stage amplifying circuit (100) comprising:
Grounded emitter, collector electrode meet power input (V
CC) driving stage power tube (Q
1), driving stage reference voltage input terminal (V
Ref1), driving stage control voltage input terminal (V
Ctrl1), utilizing driving stage reference voltage and driving stage control voltage is said driving stage power tube (Q
1) the driving stage biasing circuit (110) of adjustable bias current is provided, and input received RF signal, output connect said driving stage power tube (Q
1) base stage, realize the input impedance matching circuit (120) of sending-end impedance conversion;
Said driving stage power tube (Q
1) collector electrode and power input (V
CC) between node be the signal output part of said driving stage amplifying circuit (100);
Said output stage amplifier circuit (200) comprising:
Grounded emitter, collector electrode meet power input (V
CC) output-stage power pipe (Q
2), output stage reference voltage input terminal (V
Ref2), output stage control voltage input terminal (V
Ctrl2), utilizing output stage reference voltage and output stage control voltage is said output-stage power pipe (Q
2) the output stage biased circuit (210) of adjustable bias current is provided, and input connects said output-stage power pipe (Q
2) collector electrode, signal output part that output is said output stage amplifier circuit (200), realize the output impedance match circuit (220) of the impedance conversion of output.
2. the adjustable power amplifier of bias current according to claim 1 is characterized in that, said driving stage biasing circuit (110) comprising: the third and fourth transistor (Q
3) and (Q
4), the said third and fourth transistor (Q
3) and (Q
4) base stage connect said driving stage reference voltage input terminal (V respectively
Ref1) and said driving stage control voltage input terminal (V
Ctrl1), collector electrode all connects power input (V
CC), emitter is connected;
Said driving stage biasing circuit (110) also comprises: the 5th transistor (Q
5), first to the 3rd resistance (R
1) to (R
3) and the first electric capacity (C
1); Wherein, said the 5th transistor (Q
5) collector electrode through said the 3rd resistance (R
3) be connected to the said third and fourth (Q
3) and (Q
4) emitter and through the said second resistance (R
2) be connected to said driving stage power tube (Q
1) base stage, grounded emitter, base stage through the said first electric capacity (C
1) and the first resistance (R
1) filter circuit and the second resistance (R that form
2) be connected to said driving stage power tube (Q
1) base stage.
3. the adjustable power amplifier of bias current according to claim 2 is characterized in that, said output stage biased circuit (210) comprising: the 6th and the 7th transistor (Q
6) and (Q
7), the said the 6th and the 7th transistor (Q
6) and (Q
7) base stage connect said output stage reference voltage input terminal (V respectively
Ref2) and said output stage control voltage input terminal (V
Ctrl2), collector electrode all connects power input (V
CC), emitter is connected;
Said output stage biased circuit (210) also comprises: the 8th transistor (Q
8), the 4th to the 6th resistance (R
4) to (R
6) and the second electric capacity (C
2); Wherein, said the 8th transistor (Q
8) collector electrode through said the 6th resistance (R
6) be connected to the said the 6th and the 7th transistor (Q
6) and (Q
7) emitter and through said the 5th resistance (R
5) be connected to said output-stage power pipe (Q
2) base stage, grounded emitter, base stage through the said second electric capacity (C
2) and the 4th resistance (R
4) filter circuit and the 5th resistance (R that form
5) be connected to said output-stage power pipe (Q
2) base stage.
4. the adjustable power amplifier of bias current according to claim 1 is characterized in that said input impedance matching circuit (120) comprises the 3rd electric capacity (C
3), the 4th electric capacity (C
4) and the first inductance (L
1); Wherein, said the 3rd electric capacity (C
3) termination receives radiofrequency signal input, the other end through said the 4th electric capacity (C
4) and said driving stage power tube (Q
1) base stage connect the said first inductance (L
1) end is connected in the said third and fourth electric capacity (C
3) and (C
4) tie point, other end ground connection.
5. the adjustable power amplifier of bias current according to claim 1 is characterized in that said inter-stage impedance matching circuit (300) comprises the 5th electric capacity (C
5), the 6th electric capacity (C
6) and the second inductance (L
2); Wherein, said the 5th electric capacity (C
5) end connects said driving stage power tube (Q
1) collector electrode, the other end through said the 6th electric capacity (C
6) the said output-stage power pipe (Q of connection
2) base stage, the said second inductance (L
2) end is connected in the said the 5th and the 6th electric capacity (C
5) and (C
6) tie point, other end ground connection.
6. the adjustable power amplifier of bias current according to claim 1 is characterized in that said output impedance match circuit (220) comprises the 3rd inductance (L
3), the 7th and the 8th electric capacity (C
7) and (C
8); Wherein, said the 3rd inductance (L
3) end connects said output-stage power pipe (Q
2) collector electrode, the other end through said the 7th electric capacity (C
7) ground connection, said the 8th electric capacity (C
8) end is connected in said the 3rd inductance (L
3) and said the 7th electric capacity (C
7) tie point, the other end be the signal output part of said output stage amplifier circuit (200).
7. the adjustable power amplifier of bias current according to claim 3 is characterized in that, the said first resistance (R
1) and the second resistance (R
2) the ratio of resistance equal driving stage power tube (Q
1) emitter area and the 5th transistor (Q
5) ratio of emitter area;
Said the 4th resistance (R
4) and the 5th resistance (R
5) the ratio of resistance equal output-stage power pipe (Q
2) emitter area and the 8th transistor (Q
8) ratio of emitter area.
8. the adjustable power amplifier of bias current according to claim 1 is characterized in that, said driving stage power tube (Q
1) and said output-stage power pipe (Q
2) emitter all through grounding through hole (TWV) ground connection.
9. the adjustable power amplifier of bias current according to claim 2 is characterized in that, said driving stage biasing circuit (110) also comprises:
Be connected said the 3rd power tube (Q
3) base stage and said driving stage reference voltage input terminal (V
Ref1) between the 7th resistance (R
7); And
Be connected said the 4th power tube (Q
4) base stage and said driving stage control voltage input terminal (V
Ctrl1) between the 8th resistance (R
8).
10. the adjustable power amplifier of bias current according to claim 3 is characterized in that, said output stage biased circuit (210) also comprises:
Be connected said the 6th power tube (Q
6) base stage and said output stage reference voltage input terminal (V
Ref2) between the 9th resistance (R
9); And
Be connected said the 7th power tube (Q
7) base stage and said output stage control voltage input terminal (V
Ctrl2) between the tenth resistance (R
10).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220278344 CN202634371U (en) | 2012-06-13 | 2012-06-13 | Power amplifier with adjustable bias current |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220278344 CN202634371U (en) | 2012-06-13 | 2012-06-13 | Power amplifier with adjustable bias current |
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| Publication Number | Publication Date |
|---|---|
| CN202634371U true CN202634371U (en) | 2012-12-26 |
Family
ID=47387512
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220278344 Expired - Fee Related CN202634371U (en) | 2012-06-13 | 2012-06-13 | Power amplifier with adjustable bias current |
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| Country | Link |
|---|---|
| CN (1) | CN202634371U (en) |
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Granted publication date: 20121226 Termination date: 20130613 |