CN113595518B - Self-adaptive high-reliability HBT linear power amplifier - Google Patents
Self-adaptive high-reliability HBT linear power amplifier Download PDFInfo
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/52—Circuit arrangements for protecting such amplifiers
- H03F1/523—Circuit arrangements for protecting such amplifiers for amplifiers using field-effect devices
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/189—High frequency amplifiers, e.g. radio frequency amplifiers
- H03F3/19—High frequency amplifiers, e.g. radio frequency amplifiers with semiconductor devices only
- H03F3/193—High frequency amplifiers, e.g. radio frequency amplifiers with semiconductor devices only with field-effect devices
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/20—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers
- H03F3/21—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers with semiconductor devices only
- H03F3/211—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers with semiconductor devices only using a combination of several amplifiers
Abstract
The invention provides a self-adaptive high-reliability HBT linear power amplifier, wherein a power detection and control unit and an analog power switch unit are added on a basic HBT linear power amplifier unit. The power detection and control unit monitors the signal power intensity of the input HBT linear power amplifier, and when abnormal high-power signals are input into the HBT linear power amplifier, the analog power supply is turned off through the analog power supply switch unit to ensure that the HBT linear power amplifier is always in a safe state. By detecting the signal power input into the power amplifier in real time, the self-adaption of the HBT linear power amplifier under different working states is realized, and the defects of efficiency reduction, linearity degradation, difficult matching and the like caused by the protection of the HBT linear power amplifier by the analog power supply series current limiting resistor are overcome. The high robustness of the HBT linear power amplifier is realized on the basis of not obviously sacrificing the linearity and the efficiency of the HBT linear power amplifier.
Description
Technical Field
The invention belongs to the technical field of radio frequency front ends of wireless communication, and particularly relates to a self-adaptive high-reliability HBT linear power amplifier.
Background
Orthogonal Frequency Division Multiplexing (OFDM) is widely used as the demand of wireless communication systems for higher and higher channel bandwidth, but since OFDM technology exhibits larger signal amplitude variation, a power amplifier is required to have higher linearity and output power margin in order to correctly process these envelope peaks without distortion.
Because the GaAs HBT transistor has better linearity and lower cost than the GaAs HEMT transistor, the GaAs HBT process is generally selected when the linear power amplifier is designed.
However, the self-heating effect of the HBT transistor is very obvious in a large-current and high-power area, and if the self-heating effect of the HBT transistor is not suppressed, the HBT linear power amplifier is very easy to generate heat accumulation due to the combined action of the self-heating effect and the thermal coupling effect of the HBT transistor under an abnormal high-power output condition, so that the device is damaged.
In order to prevent the HBT linear power amplifier from being damaged when the power is abnormally outputted, a protection measure is generally adopted as shown in fig. 1, AMP1aAnd AMP2aAmplifier of driver stage, AMP, being an HBT linear power amplifier3aFinal amplifier being an HBT linear power amplifier, VCC1a、VCC2aAnd VCC3aFor analog power supply, VCC1aBy series current-limiting resistor R1aAdministering AMP1aSupply of power, VCC2aBy series current-limiting resistor R2aAdministering AMP2aAnd (5) supplying power.
With AMP1aInput signal increasing, AMP1aThe output power is increased and flows through the current limiting resistor R1aBecomes large. At this time, the current limiting resistor R1aThe partial pressure of the voltage increases, resulting in the actual loading on the AMP1aThe voltage at is low, thereby limiting the AMP1aThe maximum power output capability when an abnormal high-power signal is input prevents the amplifier of the current stage from failing and outputting excessive power to the amplifier of the next stage.
Similarly, AMP1aThe output end is connected with AMP2aInput terminal, following AMP1aIncreased output power, AMP2aThe output power is increased and flows through the current limiting resistor R2aBecomes large. At this time, the current limiting resistor R2aThe partial pressure of the light source increases, resulting in loading on the AMP2aThe voltage at is low, thereby limiting the AMP2aMaximum power output capability when abnormal high-power signal is input, so as to prevent the amplifier from failing and outputting excessive power to the final stage for amplificationDevice AMP3a。
Due to the final amplifier AMP3aThe supply voltage directly determines key indexes such as linearity of an HBT linear power amplifier, so that VCC3aIn the final amplifier AMP3aWhen power is supplied, the resistor cannot be connected in series.
After the analog power supply end is connected with the current-limiting resistor in series, the power is supplied to the driving stage in the HBT linear power amplifier, so that the driving stage amplifier needs larger current than the current-limiting resistor which is not connected in series under the condition of the same linear output power. In order to achieve a better over-power protection effect, the series resistance of the power supply terminal cannot be too small, which also causes the quiescent current of the driver-stage amplifier to be more than 50% larger than that without the current-limiting resistor, thereby causing the efficiency of the HBT linear power amplifier to be greatly reduced.
As shown in FIG. 1, the HBT linear power amplifier power output capability is primarily provided by the final amplifier AMP3aIt is decided that the final amplifier AMP is decided at the time of circuit design3aDrive stage amplifier AMP of input signal2aThe output power cannot be excessive. However, when the HBT linear power amplifier is designed, the driver amplifier is required to operate in a linear region as much as possible, thereby reducing the distortion of the pre-stage signal to the final amplifier AMP3aThe effect of linearity. The linear working area of the amplifier usually needs to back off 5 dB-8 dB at the saturated output power point, so that a current-limiting resistor R is adopted2aThen, the driver stage amplifier AMP2aThe linearity of (a) may be degraded to various degrees. So that the current limiting resistor R is selected2aIn value, a trade-off between linearity and reliability is required.
Meanwhile, as the input power of the driver stage amplifier increases, the current flowing through the current limiting resistor increases, the voltage supplied to the driver stage amplifier becomes lower, and the linearity of the driver stage amplifier is degraded along with the reduction of the voltage. Moreover, due to the continuous change of the power supply voltage, the load impedance of the driving amplifier, which can reach the optimal linearity, is also continuously changed, so that the linearity of the HBT linear power amplifier is more easily deteriorated.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a self-adaptive high-reliability HBT linear power amplifier, and a power detection and control unit and an analog power switch unit are added on the basis of a basic HBT linear power amplifier unit. The power detection and control unit monitors the signal power intensity of the input HBT linear power amplifier, and when abnormal high-power signals are input into the HBT linear power amplifier, the analog power supply is turned off through the analog power supply switch unit to ensure that the HBT linear power amplifier is always in a safe state.
The specific implementation content of the invention is as follows:
the invention provides a self-adaptive high-reliability HBT linear power amplifier which is used for power amplification in Orthogonal Frequency Division Multiplexing (OFDM) application and comprises a basic HBT linear power amplifier unit, a power detection and control unit and an analog power switch unit;
the basic HBT linear power amplifier unit comprises a driver stage amplifier AMP1bAnd a driver stage amplifier AMP2bAnd final amplifier AMP3b(ii) a The driver stage amplifier AMP1bAnd a driver stage amplifier AMP2bAnd final amplifier AMP3bConnected in series, the driver stage amplifier AMP1bIs a signal input terminal IN for an input signal1b(ii) a The final amplifier AMP3bThe output terminal of (2) is a signal output terminal OUT for outputting a signal1b；
The analog power switch unit comprises amplifiers AMP connected to the driving stages correspondingly1bAnd a driver stage amplifier AMP2bAnd final amplifier AMP3bThe first analog power switch, the second analog power switch and the third analog power switch of the power end of the power supply;
the detection input end of the power detection and control unit is connected with the signal input end IN1bAnd the control output end of the power detection and control unit is respectively connected with the first analog power switch, the second analog power switch and the third analog power switch.
To better implement the inventionIn one step, the power detection and control unit includes a Coupler1bResistance R1bResistance R2bResistance R3bResistance R4bResistance R5bResistance R6bDiode D1bCapacitor C1bOperational amplifier OPA1b；
The resistor R3bIs connected with a diode D1bRear pass diode D1bIs connected with an operational amplifier OPA1bThe inverting input terminal of (1);
the resistor R1bConnecting digital power supply VDD1bIs connected to the resistor R3bThe input terminal of, the resistor R2bIs connected with the resistor R after being grounded1bResistance R3bTo (c) to (d);
the capacitor C1bIs connected with the diode D after being grounded1bAnd operational amplifier OPA1bBetween the inverting input terminals;
the Coupler1bIs connected to the signal input terminal IN1bIs connected with the resistor R in a lap joint manner3bAnd a diode D1bTo (c) to (d);
the resistor R4bConnecting digital power supply VDD2bPost-connected to the operational amplifier OPA1bOn the forward input terminal of (1), the resistor R5bIs connected to the operational amplifier OPA after being grounded1bOn the forward input of (1);
operational amplifier OPA1bThe output end of the first analog power switch is connected with the first analog power switch, the second analog power switch and the third analog power switch respectively; the resistor R6bIs connected to the OPA after being grounded1bOn the output terminal of the switch.
To better implement the present invention, further, the first analog power switch includes a PHEMT transistor M1bAnd a resistance R7b；
The PHEMT transistor M1bIs connected with an analog power supply VCC1bSource connected to driver stage amplifier AMP1bPower supply terminal, gateConnecting resistor R7b；
The resistor R7bAnd operational amplifier OPA1bIs connected with the output end of the power supply.
To better implement the present invention, further, the second analog power switch includes a PHEMT transistor M2bAnd a resistance R8b；
The PHEMT transistor M2bIs connected with an analog power supply VCC2bSource connected to driver stage amplifier AMP2bThe grid of the power supply terminal of (2) is connected with a resistor R8b；
The resistor R8bAnd operational amplifier OPA1bIs connected with the output end of the power supply.
To better implement the present invention, further, the third analog power switch includes a PHEMT transistor M3bAnd a resistance R9b；
The PHEMT transistor M3bIs connected with an analog power supply VCC3bSource connected final amplifier AMP3bThe grid of the power supply terminal of (2) is connected with a resistor R9b；
The resistor R9bAnd operational amplifier OPA1bIs connected with the output end of the power supply.
To better implement the present invention, further, the first analog power switch includes a PHEMT transistor M1bAnd a resistance R7b(ii) a The PHEMT transistor M1bIs connected with an analog power supply VCC1bSource connected to driver stage amplifier AMP1bThe grid of the power supply terminal of (2) is connected with a resistor R7b(ii) a The resistor R7bThe power detection and control unit is connected with the control output end of the power detection and control unit;
the second analog power switch comprises a PHEMT transistor M2bAnd a resistance R8b；
The PHEMT transistor M2bIs connected with an analog power supply VCC2bSource connected to driver stage amplifier AMP2bThe grid of the power supply terminal of (2) is connected with a resistor R8b(ii) a The resistor R8bThe power detection and control unit is connected with the control output end of the power detection and control unit;
the third analog power switch comprises a PHEMT transistor M3bAnd a resistance R9b；
The PHEMT transistor M3bIs connected with an analog power supply VCC3bSource connected final amplifier AMP3bThe grid of the power supply terminal of (2) is connected with a resistor R9b(ii) a The resistor R9bAnd is connected with the control output end of the power detection and control unit.
Compared with the prior art, the invention has the following advantages and beneficial effects:
(1) the invention provides a self-adaptive high-reliability HBT linear power amplifier, which is characterized in that a power detection and control unit is added on the basis of a basic HBT linear power amplifier unit, the signal power input into the power amplifier is detected in real time, a power signal is converted into a voltage signal and then is compared with a set target value, and a control signal is output to control an analog power switch unit. When the detected input signal power is in a normal range, the analog power supply normally supplies power to the HBT linear power amplifier; and when the detected input signal power belongs to abnormal high power, the analog power supply is turned off, and the HBT linear power amplifier is ensured to be always in a safe working state.
(2) The self-adaption of the HBT linear power amplifier under different working states is realized by detecting the signal power input into the power amplifier in real time. Therefore, a series of defects of efficiency reduction, linearity degradation, difficult matching and the like caused by the protection of the HBT linear power amplifier by the analog power supply series current limiting resistor are overcome. The high robustness of the HBT linear power amplifier is realized on the basis of not obviously sacrificing the linearity and the efficiency of the HBT linear power amplifier.
Drawings
FIG. 1 is a conventional HBT linear power amplifier;
FIG. 2 is a diagram of an adaptive high reliability HBT linear power amplifier of the present invention;
FIG. 3 is a schematic diagram of output power of an HBT linear power amplifier of the present invention as a function of input power;
FIG. 4 is a graph illustrating the power gain comparison of the present invention with a conventional HBT linear power amplifier;
fig. 5 is a diagram comparing the phase error of the HBT linear power amplifier of the present invention with that of the conventional HBT linear power amplifier.
Detailed Description
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and therefore should not be considered as a limitation to the scope of protection. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Example 1:
the embodiment provides a self-adaptive high-reliability HBT linear power amplifier, which is used for power amplification in Orthogonal Frequency Division Multiplexing (OFDM) application, and as shown in fig. 2, the self-adaptive high-reliability HBT linear power amplifier includes a basic HBT linear power amplifier unit, a power detection and control unit, and an analog power switch unit;
the basic HBT linear power amplifier unit comprises a driver stage amplifier AMP1bAnd a driver stage amplifier AMP2bAnd final amplifier AMP3b(ii) a The driver stage amplifier AMP1bAnd a driver stage amplifier AMP2bAnd final amplifier AMP3bConnected in series, the driver stage amplifier AMP1bInput terminal ofFor signal input IN of input signal1b(ii) a The final amplifier AMP3bThe output terminal of (2) is a signal output terminal OUT for outputting a signal1b；
The analog power switch unit comprises amplifiers AMP connected to the driving stages correspondingly1bAnd a driver stage amplifier AMP2bAnd final amplifier AMP3bThe first analog power switch, the second analog power switch and the third analog power switch of the power end of the power supply;
the detection input end of the power detection and control unit is connected with the signal input end IN1bAnd the control output end of the power detection and control unit is respectively connected with the first analog power switch, the second analog power switch and the third analog power switch.
The working principle is as follows: the invention provides a self-adaptive high-reliability HBT linear power amplifier, which is characterized in that a power detection and control unit is added on the basis of a basic HBT linear power amplifier unit, the signal power input into the power amplifier is detected in real time, a power signal is converted into a voltage signal and then is compared with a set target value, and a control signal is output to control an analog power switch unit. When the detected input signal power is in a normal range, the analog power supply normally supplies power to the HBT linear power amplifier; and when the detected input signal power belongs to abnormal high power, the analog power supply is turned off, and the HBT linear power amplifier is ensured to be always in a safe working state. The self-adaption of the HBT linear power amplifier under different working states is realized by detecting the signal power input into the power amplifier in real time. Therefore, a series of defects of efficiency reduction, linearity degradation, difficult matching and the like caused by the protection of the HBT linear power amplifier by the analog power supply series current limiting resistor are overcome. The high robustness of the HBT linear power amplifier is realized on the basis of not obviously sacrificing the linearity and the efficiency of the HBT linear power amplifier.
Example 2:
this embodiment is based on the above embodiment 1, and further, as shown in fig. 2, in order to better implement the present inventionThe basic HBT linear power amplifier unit comprises a driver stage amplifier AMP1bAnd a driver stage amplifier AMP2bAnd final amplifier AMP3b. Coupler1bStraight end and drive stage amplifier AMP1bInput terminal connected to drive stage amplifier AMP1bOutput and driver stage amplifier AMP2bInput terminal connected to drive stage amplifier AMP2bOutput terminal and final amplifier AMP3bInput terminal connected to final amplifier AMP3bOutput terminal and signal output terminal OUT1bConnecting; driver stage amplifier AMP1bPower supply terminal and PHEMT transistor M1bA source level connection; driver stage amplifier AMP2bPower supply terminal and PHEMT transistor M2bA source level connection; final amplifier AMP3bPower supply terminal and PHEMT transistor M3bA source level connection;
the power detection and control unit comprises a Coupler1bResistance R1bResistance R2bResistance R3bResistance R4bResistance R5bResistance R6bDiode D1bCapacitor C1bOperational amplifier OPA1b. Coupler1bInput terminal and signal input terminal IN1bCoupling, Coupler1bCoupling terminal and diode D1bInput terminal, resistor R3bFirst terminals connected together, a resistor R3bSecond terminal and resistor R1bFirst terminal, resistor R2bFirst terminals connected together, a resistor R1bSecond terminal and digital power supply VDD1bConnection, resistance R2bA second terminal connected to ground, a diode D1bOutput terminal and capacitor C1bFirst terminal, operational amplifier OPA1bReverse input terminals connected together, a capacitor C1bA second terminal connected to ground, an operational amplifier OPA1bEquidirectional input end and resistor R4bFirst terminal, resistor R5bFirst terminals connected together, a resistor R4bSecond terminal and digital power supply VDD2bConnection, resistance R5bA second terminal connected to ground, an operational amplifier OPA1bOutput terminal and resistor R6bFirst terminal, resistor R7bFirst terminal, resistor R8bFirst terminal, resistor R9bFirst terminals connected together, a resistor R6bSecond terminal and digital power supply VDD3bAnd (4) connecting.
The analog power switch unit comprises a PHEMT transistor M1bPHEMT transistor M2bPHEMT transistor M3bResistance R7bResistance R8bResistance R9b. Resistance R7bSecond terminal and PHEMT transistor M1bGate-connected, PHEMT transistor M1bDrain and analog power source VCC1bConnection, resistance R8bSecond terminal and PHEMT transistor M2bGate-connected, PHEMT transistor M2bDrain and analog power source VCC2bConnection, resistance R9bSecond terminal and PHEMT transistor M3bGate-connected, PHEMT transistor M3bDrain and analog power source VCC3bAnd (4) connecting.
The working principle is as follows: radio frequency signal pass signal input terminal IN1bAfter entering the HBT linear power amplifier, the signal firstly enters the Coupler1bAn input terminal of (1);
in the power detecting and controlling unit, a resistor R1bAnd a resistance R2bFor digital power supply VDD1bPerforming voltage division through a resistor R3bProviding a stable DC operating point for the detected RF signal, resistor R3bIs a high resistance value. Parallel capacitor C1bMain rectifying action, resistance R4bAnd a resistance R5bFor digital power supply VDD2bPerforming voltage division to obtain an operational amplifier OPA1bThe same direction input end provides the set voltage value. Digital power supply VDD3bThrough a series resistance R6bAnd operational amplifier OPA1bThe output terminal is connected to an operational amplifier OPA1bAnd comparing the voltage of the same-direction input end with the voltage of the reverse-direction input end to provide an output high level.
By means of a Coupler1bThe signal of the coupling end enters a power detection and control unit, and the signal passes through a diode D in turn1bParallel capacitor C1bPost-entry operational amplifier OPA1bThe input end of the reverse direction is connected with the input end of the reverse direction,
（1）when the voltage of the inverting input terminal is lower than the set voltage value of the non-inverting input terminal, the operational amplifier OPA1bOutputs high level, at this time, simulates PHEMT transistor M in the power switch unit1bPHEMT transistor M2bPHEMT transistor M3bIn the on state, the HBT linear power amplifier is in a normal working state.
(2) When the voltage at the inverting input terminal is higher than the set voltage value at the non-inverting input terminal, the operational amplifier OPA1bOutputting low level, at the time, simulating PHEMT transistor M in power switch unit1bPHEMT transistor M2bPHEMT transistor M3bAnd the HBT linear power amplifier is in a protection state and has no amplification function in an off state.
By means of a Coupler1bThe radio frequency signal of the through end enters a drive stage amplifier AMP1bAfter the input, the signal is amplified by the driver stage amplifier AMP1b and then output to the input of the driver stage amplifier AMP2b, the signal is amplified by the driver stage amplifier AMP2b and then output to the input of the final stage amplifier AMP3b, and the signal is amplified by the final stage amplifier AMP3b and then output by the signal output terminal OUT1 b.
The power detection and control unit detects the signal power in real time and controls the analog power switch unit to carry out switch control on the analog power supply, so that the reliability of the HBT linear power amplifier under the condition of abnormal high-power input can be improved under the condition that the normal work of the HBT linear power amplifier is not influenced, and the high robustness of the HBT linear power amplifier is realized.
Other parts of this embodiment are the same as those of embodiment 1, and thus are not described again. It should be noted that the curve segment in fig. 2 is the Coupler1bIs not a redundant/erroneous line segment.
Example 3:
in this embodiment, on the basis of any of the above embodiments 1-2, in the design of the linear power amplifier, amplitude modulation-amplitude modulation (AM-AM) and amplitude modulation-phase modulation (AM-PM) of the fundamental frequency are generally adopted to characterize the performance of the HBT linear power amplifier, and the corresponding Adjacent Channel Power Ratio (ACPR) is calculated based on the AM-AM/AM-PM characteristics. The smoother the AM-AM curve is, the later the AM-AM curve enters a nonlinear region under higher output power is, the better the linearity of the power amplifier is; the smaller the change of the AM-PM curve, the better the linearity of the power amplifier.
Fig. 3 is a schematic diagram of the output power of the HBT linear power amplifier of the present invention as a function of the input power. As can be seen from FIG. 3, when the input signal power is in the normal range (< 4 dBm), the HBT linear power amplifier operates normally, and the output power increases with the increase of the input power; when the power of the input signal is more than 4dBm, the output power is reduced to be less than-10 dBm, and at the moment, when the power of the input signal detected by the power detection and control unit is higher than a set value, the analog power supply switching unit is controlled to switch off the analog power supply. Ensuring that the HBT linear power amplifier does not cause device damage due to abnormally large signal inputs.
Fig. 4 is a graph showing the power gain comparison (AM-AM curve) of the HBT linear power amplifier of the present invention with a conventional HBT linear power amplifier. Δ is the relation curve between the power gain and the output power of the conventional HBT linear power amplifier, and O is the relation curve between the power gain and the output power of the linear power amplifier. As can be seen from fig. 4, compared with the conventional HBT linear power amplifier, the power gain curve of the adaptive high-reliability HBT linear power amplifier provided by the present invention is smoother and more linear before high power (30 dBm) output.
Fig. 5 is a graph showing the power gain comparison (AM-PM curve) of the HBT linear power amplifier of the present invention with that of a conventional HBT linear power amplifier. Δ is the relation curve between the phase error and the output power of the conventional HBT linear power amplifier, and O is the relation curve between the phase error and the output power of the invention. As can be seen from fig. 5, compared with the conventional HBT linear power amplifier, the adaptive high-reliability HBT linear power amplifier provided by the present invention has smaller phase error and better linearity.
Other parts of this embodiment are the same as any of embodiments 1-2 described above, and thus are not described again.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and all simple modifications and equivalent variations of the above embodiments according to the technical spirit of the present invention are included in the scope of the present invention.
Claims (6)
1. A self-adaptive high-reliability HBT linear power amplifier is used for power amplification in Orthogonal Frequency Division Multiplexing (OFDM) application and is characterized by comprising a basic HBT linear power amplifier unit, a power detection and control unit and an analog power switch unit;
the basic HBT linear power amplifier unit comprises a driver stage amplifier AMP1bAnd a driver stage amplifier AMP2bAnd final amplifier AMP3b(ii) a The driver stage amplifier AMP1bAnd a driver stage amplifier AMP2bAnd final amplifier AMP3bConnected in series, the driver stage amplifier AMP1bIs a signal input terminal IN for an input signal1b(ii) a The final amplifier AMP3bThe output terminal of (2) is a signal output terminal OUT for outputting a signal1b；
The analog power switch unit comprises amplifiers AMP connected to the driving stages correspondingly1bAnd a driver stage amplifier AMP2bAnd final amplifier AMP3bThe first analog power switch, the second analog power switch and the third analog power switch of the power end of the power supply;
the detection input end of the power detection and control unit is connected with the signal input end IN1bAnd the control output end of the power detection and control unit is respectively connected with the control end of the first analog power switch, the control end of the second analog power switch and the control end of the third analog power switch.
2. The adaptive high reliability HBT linear power amplifier of claim 1, wherein said power detection and control unit comprises a Coupler1bResistance R1bResistance R2bResistance R3bResistance R4bResistance R5bResistance R6bDiode D1bCapacitor C1bTo transportOperational amplifier OPA1b；
The resistor R3bIs connected with a diode D1bRear pass diode D1bIs connected with an operational amplifier OPA1bThe inverting input terminal of (1);
the resistor R1bConnecting digital power supply VDD1bIs connected to the resistor R3bThe input terminal of, the resistor R2bIs connected with the resistor R after being grounded1bResistance R3bTo (c) to (d);
the capacitor C1bIs connected with the diode D after being grounded1bAnd operational amplifier OPA1bBetween the inverting input terminals;
the Coupler1bIs connected to the signal input terminal IN1bIs connected with the resistor R in a lap joint manner3bAnd a diode D1bTo (c) to (d);
the resistor R4bConnecting digital power supply VDD2bPost-connected to the operational amplifier OPA1bOn the forward input terminal of (1), the resistor R5bIs connected to the operational amplifier OPA after being grounded1bOn the forward input of (1);
the operational amplifier OPA1bThe output end of the first analog power switch is respectively connected with the control end of the first analog power switch, the control end of the second analog power switch and the control end of the third analog power switch; the resistor R6bIs connected to the OPA after being grounded1bOn the output terminal of the switch.
3. The adaptive high reliability HBT linear power amplifier of claim 2, wherein said first analog power switch comprises PHEMT transistor M1bAnd a resistance R7b；
The PHEMT transistor M1bIs connected with an analog power supply VCC1bSource connected to driver stage amplifier AMP1bThe grid of the power supply terminal of (2) is connected with a resistor R7b；
The resistor R7bAnd operational amplifier OPA1bIs connected with the output end of the power supply.
4. The adaptive high reliability HBT linear power amplifier of claim 2, wherein said second analog power switch comprises PHEMT transistor M2bAnd a resistance R8b；
The PHEMT transistor M2bIs connected with an analog power supply VCC2bSource connected to driver stage amplifier AMP2bThe grid of the power supply terminal of (2) is connected with a resistor R8b；
The resistor R8bAnd operational amplifier OPA1bIs connected with the output end of the power supply.
5. The adaptive high reliability HBT linear power amplifier of claim 2, wherein said third analog power switch comprises PHEMT transistor M3bAnd a resistance R9b；
The PHEMT transistor M3bIs connected with an analog power supply VCC3bSource connected final amplifier AMP3bThe grid of the power supply terminal of (2) is connected with a resistor R9b；
The resistor R9bAnd operational amplifier OPA1bIs connected with the output end of the power supply.
6. The adaptive high reliability HBT linear power amplifier of claim 1, wherein said first analog power switch comprises PHEMT transistor M1bAnd a resistance R7b(ii) a The PHEMT transistor M1bIs connected with an analog power supply VCC1bSource connected to driver stage amplifier AMP1bThe grid of the power supply terminal of (2) is connected with a resistor R7b(ii) a The resistor R7bThe power detection and control unit is connected with the control output end of the power detection and control unit;
the second analog power switch comprises a PHEMT transistor M2bAnd a resistance R8b；
The PHEMT transistor M2bIs connected with an analog power supply VCC2bSource connected to driver stage amplifier AMP2bPower supply terminal, gateConnecting resistor R8b(ii) a The resistor R8bThe power detection and control unit is connected with the control output end of the power detection and control unit;
the third analog power switch comprises a PHEMT transistor M3bAnd a resistance R9b；
The PHEMT transistor M3bIs connected with an analog power supply VCC3bSource connected final amplifier AMP3bThe grid of the power supply terminal of (2) is connected with a resistor R9b(ii) a The resistor R9bAnd is connected with the control output end of the power detection and control unit.
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| CN115567012B (en) * | 2022-11-22 | 2023-03-10 | 成都明夷电子科技有限公司 | Self-adaptive broadband Doherty power amplifier |
| CN115913155B (en) * | 2023-02-01 | 2023-05-23 | 成都明夷电子科技有限公司 | High-linearity power amplifier suitable for 5G system |
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