CN113206643A - Power amplifier circuit and electronic device - Google Patents
Power amplifier circuit and electronic device Download PDFInfo
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- CN113206643A CN113206643A CN202110436459.6A CN202110436459A CN113206643A CN 113206643 A CN113206643 A CN 113206643A CN 202110436459 A CN202110436459 A CN 202110436459A CN 113206643 A CN113206643 A CN 113206643A
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/32—Modifications of amplifiers to reduce non-linear distortion
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- 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
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Abstract
The invention provides a power amplifier circuit and an electronic device, wherein the power amplifier circuit comprises a driving stage module, an output stage module, a first bias module, a second bias module and a bias compensation module; the bias compensation module is configured to monitor a temperature of the output stage module and a temperature of an environment in which the power amplifier is located; the bias compensation module is connected with a control signal and is electrically connected with the input end of the first bias module; the first bias module is connected with the control signal and is electrically connected with the driving stage module; the second bias module is connected with the control signal and is electrically connected with the output stage module; the first end of the driving stage module is connected with an original input signal, and the second end of the driving stage module is electrically connected with the first end of the output stage module; the second end of the output stage module is directly or indirectly electrically connected with the antenna. And generating a bias compensation current through the bias compensation module so that the gains of the power amplifier circuit when the working mode is switched tend to be consistent.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a power amplifier circuit and an electronic device.
Background
The GaAs HBT (heterojunction bipolar transistor ) is one of the most widely used technology of radio frequency power amplifier chips at present, the traditional radio frequency power amplifier chip of the two-stage GaAs HBT technology comprises a driving HBT and an output HBT, the driving HBT and the output HBT are respectively provided with bias currents by different bias circuits, a control terminal of the bias circuit is connected with a control signal of the radio frequency power amplifier, and further, the control of the driving HBT and the output HBT is realized by controlling the bias circuit.
The GaAs HBT as an amplifying tube has the characteristic that the gain is reduced along with the increase of the junction temperature, and when the radio frequency power amplifier chip is started, heat is accumulated inside the chip. The junction temperatures of the GaAs HBTs are different under the control signals with different duty ratios, the average junction temperature is higher when the duty ratio of the control signals is high, and the average junction temperature is lower when the duty ratio of the control signals is low. Due to the higher junction temperature, the gain of conventional rf power amplifier chips may drop at high duty cycle turn-on.
In the prior art, a temperature monitoring device is generally arranged to detect the temperature of an environment, so as to compensate the output power, however, the gain of a radio frequency power amplifier chip is changed due to the change of the junction temperature of the HBT, and the prior art cannot fundamentally solve the problem of the gain change when the power amplifier switches the working mode (i.e., the duty ratio of a control signal is changed).
Disclosure of Invention
The invention provides a power amplifier circuit and an electronic device, which aim to solve the problem of gain change when a power amplifier switches working modes.
According to a first aspect of the present invention, there is provided a power amplifier circuit, comprising a driving stage module, an output stage module, a first bias module, a second bias module and a bias compensation module;
the bias compensation module is configured to monitor the temperature of the output stage module to obtain an output stage temperature; the bias compensation module is also configured to monitor the temperature of the environment where the power amplifier is located, and obtain the environment temperature;
the bias compensation module is connected with a control signal, and is electrically connected with the input end of the first bias module and used for: when the duty ratio of the control signal is changed, generating a bias compensation current according to the output stage temperature and the environment temperature, and feeding the bias compensation current back to the first bias module; the duty ratio is a duty ratio control signal for switching a first level signal and a second level signal in the control signal;
the first bias module is connected with the control signal, and is electrically connected with the driving stage module so as to feed back the first bias voltage to the driving stage module according to the bias compensation current when the control signal is the first level signal;
the second bias module is connected with the control signal and is electrically connected with the output stage module so as to feed back the second bias voltage to the output stage module when the control signal is the first level signal;
a first end of the driving stage module is connected with an original input signal, a second end of the driving stage module is electrically connected with a first end of the output stage module, so that the original input signal is amplified based on the first bias voltage to obtain an amplified signal, and the amplified signal is transmitted to the output stage module;
the second end of the output stage module is directly or indirectly electrically connected with an antenna so as to amplify the received amplified signal based on the second bias voltage to obtain a target signal, and the target signal is directly or indirectly transmitted to the antenna.
Optionally, the offset compensation module includes a temperature difference detection unit and a compensation control unit;
the temperature difference detection unit is configured to monitor the output stage temperature and the ambient temperature to generate a temperature difference signal from the output stage temperature and the ambient temperature, the temperature difference signal being indicative of a temperature difference between the output stage temperature and the ambient temperature;
the output end of the temperature difference detection unit is electrically connected with the first input end of the compensation control unit so as to transmit the temperature difference signal to the compensation control unit;
the second input end of the compensation control unit is connected with a control signal, the output end of the compensation control unit is electrically connected with the input end of the first bias module, when the duty ratio of the control signal is changed, the bias compensation current is generated according to the temperature difference signal, and the bias compensation current is fed back to the first bias module.
Optionally, the temperature difference detecting unit includes a first temperature sensitive element, a second temperature sensitive element and a subtracter,
the voltage value or the resistance value of the first temperature sensitive element is matched with the temperature of the output stage, the first end of the first temperature sensitive element is electrically connected with the first input end of the subtracter, and the second end of the first temperature sensitive element is grounded;
the voltage value or the resistance value of the second temperature sensitive element is matched with the ambient temperature, the first end of the second temperature sensitive element is electrically connected with the second input end of the subtracter, and the second end of the second temperature sensitive element is grounded;
and the output end of the subtracter is electrically connected with the first input end of the compensation control unit.
Optionally, the temperature difference detecting unit further includes a first resistor and a second resistor, the first temperature sensitive element is a first diode, the second temperature sensitive element is a second diode,
the voltage value of the first diode is matched with the temperature of the output stage, the anode of the first diode is electrically connected with the first end of the first resistor and the first input end of the subtracter, and the cathode of the first diode is grounded;
the voltage value of the second diode is matched with the ambient temperature, the anode of the second diode is electrically connected with the first end of the second resistor and the second input end of the subtracter, and the cathode of the second diode is grounded;
the second end of the first resistor and the second end of the second resistor are electrically connected with a first power supply.
Optionally, the compensation control unit includes an analog-to-digital converter, a controller, and a current source subunit;
the input end of the analog-to-digital converter is electrically connected with the output end of the temperature difference detection unit, the enable end of the analog-to-digital converter is connected with the control signal, and when the duty ratio of the control signal is changed, the temperature difference signal is subjected to analog-to-digital conversion to obtain a digital temperature difference signal;
the output end of the analog-to-digital converter is electrically connected with the input end of the controller so as to transmit the digital temperature difference signal to the controller;
the output end of the controller is electrically connected with the input end of the current source subunit so as to control the current source subunit to generate bias compensation current according to the digital temperature difference signal;
the output end of the current source subunit is electrically connected with the input end of the first bias module so as to feed back the bias compensation current to the first bias module.
Optionally, the current source subunit includes M current sources and M switches, a first end of each switch is electrically connected to the output terminal of the controller, a second end of each switch is electrically connected to the first end of one current source, a second end of each current source is electrically connected to the input terminal of the first bias module, and the controller controls the number of switches closed in the M switches according to the digital temperature difference signal, so as to control the magnitude of the bias compensation current.
Optionally, the first bias module includes a first bias transistor, a first bias current source,
the first end of the first bias current source is electrically connected with a second power supply, the controlled end of the first bias current source is connected with the control signal, and the second end of the first bias current source is electrically connected with the control electrode of the first bias transistor;
a control electrode of the first bias transistor is electrically connected with an output end of the bias compensation module;
the first pole of the first bias transistor is electrically connected with a third power supply, and the second pole of the first bias transistor is electrically connected with the first end of the driving stage module.
Optionally, the second bias module includes a second bias transistor, a second bias current source,
a first end of the second bias current source is electrically connected with a fourth power supply, a controlled end of the second bias current source is connected to the control signal, and a second end of the second bias current source is electrically connected with a control electrode of the second bias transistor;
the first pole of the second bias transistor is electrically connected with a third power supply, and the second pole of the second bias transistor is electrically connected with the first end of the output stage module.
Optionally, the driving stage module includes a driving transistor, a control electrode of the driving transistor is electrically connected to the output end of the first bias module, a first electrode of the driving transistor is electrically connected to the third power supply directly or indirectly, and a second electrode of the driving transistor is grounded.
Optionally, the driving stage module includes a driving inductor, a first end of the driving inductor is electrically connected to the first pole of the driving transistor, and a second end of the driving inductor is electrically connected to the third power supply.
Optionally, the output stage module includes an output transistor, a control electrode of the output transistor is electrically connected to the output end of the second bias module, a first electrode of the output transistor is directly or indirectly electrically connected to the third power supply, and a second electrode of the output transistor is grounded.
Optionally, the output stage module includes an output inductor, a first end of the output inductor is electrically connected to the first pole of the output transistor, and a second end of the output inductor is electrically connected to the third power supply.
Optionally, the power amplifier circuit further comprises a first capacitor and a second capacitor,
the first end of the first capacitor is connected to the original input signal, and the second end of the first capacitor is electrically connected to the first end of the driving stage module;
the first end of the second capacitor is electrically connected with the second end of the driving stage module, and the second end of the second capacitor is electrically connected with the first end of the output stage module.
Optionally, the power amplifier circuit further includes an output matching module, a first end of the output matching module is electrically connected to a second end of the output stage module, and a second end of the output matching module is electrically connected to the antenna.
Optionally, the driving stage module, the output stage module, the first bias module and the second bias module are disposed on a first circuit board, and the bias compensation module is partially disposed on a second circuit board.
According to a second aspect of the present invention there is provided an electronic device comprising the power amplifier circuit of the first aspect of the present invention and its alternatives.
According to the power amplifier circuit and the electronic equipment, the output stage temperature of the output stage module and the environment temperature of the power amplifier are monitored through the bias compensation module, and then when the duty ratio of a control signal is changed, the bias compensation module generates bias compensation current to compensate the first bias voltage, so that the reduction of the gain of the output stage module caused by overhigh temperature is compensated through the increase of the first bias voltage of the driving stage module, and the gain of the power amplifier circuit tends to be consistent when the working mode is switched;
meanwhile, the bias compensation module compensates the first bias voltage of the first bias module, and compared with the partial scheme that the bias compensation module compensates the second bias voltage of the second bias module, the bias compensation module has the advantages that the bias compensation current required to be generated is smaller, and further the working efficiency can be improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a first schematic diagram of a power amplifier circuit according to an embodiment of the invention;
FIG. 2 is a second schematic diagram of a power amplifier circuit according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a power amplifier circuit according to an embodiment of the invention;
FIG. 4 is a schematic circuit diagram of the temperature detecting unit 131 according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of the first circuit board 21 according to an embodiment of the invention;
fig. 6 is a fourth schematic diagram illustrating a power amplifier circuit according to an embodiment of the invention;
FIG. 7 is a circuit diagram of the compensation control unit 132 according to an embodiment of the present invention;
FIG. 8 is a circuit diagram of a power amplifier circuit according to an embodiment of the invention;
fig. 9 is a schematic structural diagram of the first circuit board 21 and the second circuit board 22 in one embodiment of the present invention;
FIG. 10 is a waveform illustrating a portion of a critical device or critical node in an embodiment of the invention.
Description of reference numerals:
11-a driver stage module; 12-an output stage module; 13-an offset compensation module; 14-a first biasing module; 15-a second biasing module; 16-an output matching module;
IN-original input signal; a PA _ EN control signal; an ANT-antenna;
131-a temperature detection unit; 132-a compensation control unit;
1311-a first temperature sensitive device; 1312-a second temperature sensitive device; u1-subtracter;
r1 — first resistance; r2 — second resistance; d1 — first diode; d2 — second diode;
u2-analog-to-digital converter; u3-controller; 1321-current source subcell;
i-a current source; a K-switch; iboost-bias compensation current;
IREF1 — a first bias current source; q14-first biased diode; IREF2 — a second bias current source; q15-second biased diode;
q11-drive diode; l11 — drive inductance; q12-output diode; l12 — output inductance;
c1 — first capacitance; a C2 second capacitor; c16-matching capacitance; l16-matching inductance;
vcc1 — first power supply; vcc2 — second power supply; vcc3 — third power supply; vcc 4-fourth power supply.
Detailed Description
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 is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The terms "first," "second," "third," "fourth," and the like in the description and in the claims, as well as in the drawings, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The technical solution of the present invention will be described in detail below with specific examples. The following several specific embodiments may be combined with each other, and details of the same or similar concepts or processes may not be repeated in some embodiments.
Referring to fig. 1, a power amplifier circuit according to an embodiment of the invention includes a driving stage module 11, an output stage module 12, a first bias module 14, a second bias module 15, and a bias compensation module 13;
the offset compensation module 13 is configured to monitor the temperature of the output stage module 12 to obtain an output stage temperature; the bias compensation module 13 is further configured to monitor the temperature of the environment in which the power amplifier is located, and obtain an environment temperature;
the offset compensation module 13 is connected to a control signal PA _ EN, and the offset compensation module 13 is electrically connected to an input end of the first offset module 14, and is configured to: when the duty ratio of the control signal PA _ EN is changed, generating a bias compensation current Iboost according to the output stage temperature and the ambient temperature, and feeding back the bias compensation current Iboost to the first bias module 14; the control signal PA _ EN includes a first control signal PA _ EN1 and a second control signal PA _ EN 2;
the control signal PA _ EN may be understood as an enable signal for controlling the amplifier circuit to be turned on and off, and may be, for example, when the control signal PA _ EN is at a high level, the power amplifier circuit is turned on, and when the control signal PA _ EN is at a low level, the power amplifier circuit is turned off;
the duty ratio of the control signal PA _ EN is changed, and it can be understood that two control signals with different duty ratios are switched, and the waveforms can be, for example, the waveforms of the two control signals in fig. 10.
The first bias module 14 is connected to the control signal, and the first bias module 14 is electrically connected to the driver stage module 11, so as to feed back the first bias voltage to the driver stage module 11 according to the bias compensation current Iboost when the control signal is the first level signal;
the second bias module 15 is connected to the control signal, and the second bias module 15 is electrically connected to the output stage module 12 to feed back the second bias voltage to the output stage module 12 when the control signal is the first level signal;
a first end of the driver module 11 is connected to an original input signal IN, and a second end of the driver module 11 is electrically connected to a first end of the output module 12, so as to amplify the original input signal IN based on the first bias voltage to obtain an amplified signal, and transmit the amplified signal to the output module 12;
the second end of the output stage module 12 is directly or indirectly electrically connected to an antenna ANT, so as to amplify the received amplified signal based on the second bias voltage to obtain a target signal, and the target signal is directly or indirectly transmitted to the antenna ANT.
In the above embodiment, the offset compensation for the first offset module is completed at the instant when the working mode of the power amplifier circuit changes, and the offset compensation current does not change in the whole working process of the power amplifier circuit. Therefore, the stability of the working point of the power amplifier circuit in the working process is ensured, and the serious memory effect cannot be generated.
In one example, the power amplifier operates according to the following principle:
the duty ratio of the first control signal PA _ EN1 is 90%, the duty ratio of the second control signal PA _ EN2 is 10%, when the control signal is switched from the second control signal to the first control signal within a short time, the temperature of the output stage module 12 is higher, the offset compensation module 13 monitors the output stage temperature and the ambient temperature when the rising edge of the first control signal comes, generates an offset compensation current Iboost according to the temperature monitoring result, and feeds the offset compensation current Iboost back to the first offset module 14, the first offset module 14 generates a first offset voltage according to the received offset compensation current and the first control signal, and feeds the first offset voltage back to the driving stage module 11, so that the driving stage module 11 amplifies the original input signal IN based on the first offset voltage.
The power amplifier circuit monitors the output stage temperature of the output stage module 12 and the ambient temperature of the power amplifier through the bias compensation module 13, and then when the duty ratio of the control signal PA _ EN changes (i.e. switching between the first control signal PA _ EN1 and the second control signal PA _ EN 2), the bias compensation module generates the bias compensation current Iboost to compensate the first bias voltage, so that the decrease of the gain of the output stage module 12 caused by the over-high temperature is compensated back by the increase of the first bias voltage of the driving stage module 11, so that the gain tends to be consistent when the power amplifier circuit switches the working mode;
meanwhile, the offset compensation module 13 compensates the first offset voltage of the first offset module 14, and compared with the partial scheme in which the offset compensation module 13 compensates the second offset voltage of the second offset module 15, the offset compensation current Iboost required to be generated in the present invention is smaller, so that the working efficiency can be improved.
Referring to fig. 2, in one embodiment, the offset compensation module 13 includes a temperature difference detection unit 131 and a compensation control unit 132;
the temperature difference detection unit 131 is configured to be able to monitor the output stage temperature and the ambient temperature to generate a temperature difference signal from the output stage temperature and the ambient temperature, the temperature difference signal being indicative of a temperature difference between the output stage temperature and the ambient temperature;
the output end of the temperature difference detection unit 131 is electrically connected to the first input end of the compensation control unit 132, so as to transmit the temperature difference signal to the compensation control unit 132;
the second input terminal of the compensation control unit 132 is connected to a control signal PA _ EN, the output terminal of the compensation control unit 132 is electrically connected to the input terminal of the first bias module 14, and when the duty ratio of the control signal PA _ EN changes (i.e. switches between the first control signal PA _ EN1 and the second control signal PA _ EN 2), the offset compensation current boost is generated according to the temperature difference signal and is fed back to the first bias module.
Referring to fig. 3, in one embodiment, the temperature difference detecting unit 131 includes a first temperature sensitive element 1311, a second temperature sensitive element 1312 and a subtractor U1,
the voltage value or the resistance value of the first temperature sensitive element 1311 is adapted to the temperature of the output stage, a first end of the first temperature sensitive element 1311 is electrically connected to a first input end of the subtractor U1, and a second end of the first temperature sensitive element 1311 is grounded;
the voltage value or the resistance value of the second temperature sensitive element 1312 is adapted to the ambient temperature, a first end of the second temperature sensitive element 1312 is electrically connected to a second input end of the subtractor U1, and a second end of the second temperature sensitive element 1312 is grounded;
an output terminal of the subtractor U1 is electrically connected to a first input terminal of the compensation control unit 132.
In the above embodiment, the voltage value or the resistance value of the first temperature sensitive element 1311 is adapted to the temperature of the output stage, which may be understood as thermally coupling the first temperature sensitive element with the output stage module, so that the voltage value or the resistance value of the first temperature sensitive element changes with the temperature of the output stage; the voltage value or the resistance value of the second temperature sensitive element 1312 is adapted to the ambient temperature, and it is understood that the second temperature sensitive element is disposed at a position (for example, the position in fig. 5) far away from the output stage module, so that the voltage value or the resistance value of the second temperature sensitive element changes with the change of the ambient temperature of the environment where the power amplifier circuit is located.
In the above embodiment, the temperature of the output stage and the ambient temperature are converted into the voltage amount which is conveniently reflected in the circuit by the temperature sensitive element, so that the first bias voltage is changed along with the change of the ambient difference signal, and the change of the gain of the power amplifier circuit when the working mode is switched is further reduced.
Referring to fig. 4, in one embodiment, the temperature difference detecting unit 132 further includes a first resistor R1 and a second resistor R2, the first temperature sensitive device 1311 is a first diode D1, the second temperature sensitive device 1312 is a second diode D2,
the voltage value of the first diode D1 (namely the forward voltage drop of the first diode) is adapted to the temperature of the output stage, the anode of the first diode D1 is electrically connected with the first end of the first resistor R1 and the first input end of the subtracter U1, and the cathode of the first diode D1 is grounded;
the voltage value of the second diode D2 (i.e. the forward voltage drop of the second diode) is adapted to the ambient temperature, the positive electrode of the second diode D2 is electrically connected to the first end of the second resistor R2 and the second input end of the subtractor U1, and the negative electrode of the second diode D2 is grounded;
a second end of the first resistor R1 and a second end of the second resistor R2 are electrically connected with a first power supply Vcc 1;
the first diode and the second diode are temperature sensitive diodes.
In the above embodiment, the first diode and the second diode may be replaced by other temperature sensitive devices, for example, may be replaced by a temperature sensitive resistor, and then the resistance value of the temperature sensitive resistor is respectively adapted to the output stage temperature and the ambient temperature; for example, it is also possible to replace the HBT with a HBT whose threshold voltage is adapted to the output stage temperature and the ambient temperature, respectively.
Referring to fig. 5, in one embodiment, a part of the power amplifier circuit is integrated on the first circuit board 21, the output stage module includes an output stage HBT array, the driving stage module includes a driving stage HBT array, the first diode D1 can be disposed between the output stage HBT arrays to form a temperature close coupling with the HBT arrays of the output stage module, the second diode D2 can be disposed at any position away from the output stage HBT array, such as the upper left corner of the first circuit board 21 in fig. 5, the first diode D1 monitors the temperature of the output stage HBT array, and converts the temperature into a first temperature voltage having a voltage value of V1, and the second diode D2 monitors the ambient temperature, and converts the temperature into a second temperature voltage having a voltage value of V2, and the voltage values of V1 and V2 are converted into a temperature difference signal through a subtractor.
Referring to fig. 6, in one embodiment, the compensation control unit 132 includes an analog-to-digital converter U2, a controller U3, and a current source sub-unit 1321;
an input end of the analog-to-digital converter U2 is electrically connected to an output end of the temperature difference detection unit 131, an enable end of the analog-to-digital converter U2 is connected to the control signal PA _ EN, and when a duty ratio of the control signal PA _ EN changes (i.e., switches between the first control signal PA _ EN1 and the second control signal PA _ EN 2), the temperature difference signal is subjected to analog-to-digital conversion to obtain a digital temperature difference signal;
the output end of the analog-to-digital converter U2 is electrically connected with the input end of the controller U3 so as to transmit the digital temperature difference signal to the controller U3;
an output terminal of the controller U3 is electrically connected to an input terminal of the current source subunit 1321, so as to control the current source subunit 1321 to generate a bias compensation current Iboost according to the digital temperature difference signal; the controller U3 may be a control chip or a control circuit integrated with a plurality of electronic devices, so as to control the current source subunit 1321 to generate the bias compensation current Iboost according to the received numerical temperature difference signal;
the output terminal of the current source subunit 1321 is electrically connected to the input terminal of the first bias module 14, so as to feed back the bias compensation current Iboost to the first bias module 14.
In one example, an input terminal of the analog-to-digital converter U2 is electrically connected to an output terminal of the subtractor U1 and receives the temperature difference signal.
Referring to fig. 7, in one embodiment, the current source subunit 1321 includes M current sources I and M switches K, a first terminal of each switch is electrically connected to the output terminal of the controller U3, a second terminal of each switch is electrically connected to a first terminal of one current source, a second terminal of each current source is electrically connected to the input terminal of the first bias module 14, and the controller U3 controls the number of closed switches of the M switches K according to the digital temperature difference signal to control the magnitude of the bias compensation current Iboost.
In one example, the compensation control module 132 operates as follows:
the analog-to-digital converter U2 receives the temperature difference signal from the subtractor U1, performs analog-to-digital conversion on the temperature difference signal, converts the temperature difference signal into nbit data (i.e., a numerical temperature difference signal), and transmits the nbit data to the controller U3, the controller U3 generates a corresponding control signal according to the nbit data, and controls the number of closed switches of the M switches to control the magnitude of the offset compensation current Iboost, where the larger the voltage value Vcon corresponding to the temperature difference signal is, the more the number of closed switches is, and the larger the offset compensation current Iboost is.
Referring to fig. 8, in one embodiment, the first bias module 14 includes a first bias transistor Q14, a first bias current source IREF1,
a first end of the first bias current source IREF1 is electrically connected to a second power supply Vcc2, a controlled end of the first bias current source IREF1 is connected to the control signal PA _ EN, and a second end of the first bias current source IREF1 is electrically connected to a control electrode of the first bias transistor Q14;
the control electrode of the first bias transistor Q14 is electrically connected to the output terminal of the bias compensation module 13;
a first pole of the first bias transistor Q14 is electrically connected to a third power source Vcc3, and a second pole of the first bias transistor Q14 is electrically connected to the first end of the driving stage module 11.
In one embodiment, the second bias module 15 comprises a second bias transistor Q15, a second bias current source IREF2,
a first end of the second bias current source IREF2 is electrically connected to a fourth power supply Vcc4, a controlled end of the second bias current source IREF2 is connected to the control signal PA _ EN, and a second end of the second bias current source IREF2 is electrically connected to a control electrode of the second bias transistor Q15;
a first pole of the second bias transistor Q15 is electrically connected to a third power source Vcc3, and a second pole of the second bias transistor Q15 is electrically connected to the first end of the output stage module 12.
In one embodiment, the driving stage module 11 includes a driving transistor Q11, a control electrode of the driving transistor Q11 is electrically connected to the output terminal of the first bias module 14, a first electrode of the driving transistor Q11 is electrically connected to a third power source Vcc3 directly or indirectly, and a second electrode of the driving transistor Q11 is grounded.
The driving transistor Q11 may be a single GaAs HBT or an array composed of GaAs HBTs, the control electrode of the driving transistor Q11 may be the base electrode of the driving transistor Q11, the first electrode of the driving transistor Q11 may be the collector electrode of the driving transistor Q11, and the second electrode of the driving transistor Q11 may be the emitter electrode of the driving transistor Q11.
In one embodiment, the driving stage module 11 includes a driving inductor L11, a first terminal of the driving inductor L11 is electrically connected to the first pole of the driving transistor Q11, and a second terminal of the driving inductor L11 is electrically connected to the third power Vcc 3.
In one embodiment, the output stage module 12 includes an output transistor Q12, a control electrode of the output transistor Q12 is electrically connected to the output terminal of the second bias module 15, a first electrode of the output transistor Q12 is electrically connected to a third power source Vcc3 directly or indirectly, and a second electrode of the output transistor Q12 is grounded.
The output transistor Q12 may be a single GaAs HBT or an array of GaAs HBTs, the control electrode of the output transistor Q12 may be the base electrode of the output transistor Q12, the first electrode of the output transistor Q12 may be the collector electrode of the output transistor Q12, and the second electrode of the output transistor Q12 may be the emitter electrode of the output transistor Q12.
In one embodiment, the output stage module 12 includes an output inductor L12, a first terminal of the output inductor L12 is electrically connected to the first pole of the output transistor Q12, and a second terminal of the output inductor L12 is electrically connected to the third power source Vcc 3.
In one embodiment, the power amplifier circuit further comprises a first capacitor C1 and a second capacitor C2,
a first end of the first capacitor C1 is connected to the original input signal IN, and a second end of the first capacitor C1 is electrically connected to a first end of the driving stage module 11;
the first terminal of the second capacitor C2 is electrically connected to the second terminal of the driving stage module 11, and the second terminal of the second capacitor C2 is electrically connected to the first terminal of the output stage module 12.
The first capacitor C1 functions to isolate the power amplifier circuit from the signal transmitting circuit of the previous stage, and the second capacitor C2 functions to isolate the driving stage module from the output stage module.
In one embodiment, the power amplifier circuit further includes an output matching module 16, a first terminal of the output matching module 16 is electrically connected to a second terminal of the output stage module 12, and a second terminal of the output matching module 16 is electrically connected to the antenna ANT.
In one example, the output matching module 16 includes a matching capacitor C16 and a matching inductor L16, a first terminal of the matching capacitor C16 is electrically connected to a first pole of the output stage transistor Q12, and a second terminal of the matching capacitor C16 is electrically connected to the antenna ANT;
the first end of the matching inductor L16 is electrically connected to the second end of the matching capacitor C16, and the second end of the matching inductor L16 is grounded.
In another example, the output matching module 16 may be a matching network formed by a plurality of matching units, each matching unit includes a matching capacitor and a matching inductor, a first end of each matching inductor is electrically connected to one end of one matching capacitor, a second end of each matching inductor is grounded, and then the plurality of matching capacitors are connected in series to form the matching network.
Referring to fig. 9, in one embodiment, the driving stage module 11, the output stage module 12, the first bias module 14, and the second bias module 15 are disposed on a first circuit board 21, and the bias compensation module 13 is partially disposed on a second circuit board 22.
In an example, since the GaAs HBT process is not suitable for making a complex digital circuit, the functions of analog-to-digital conversion and controlling the offset compensation current can be implemented based on a silicon-based process such as CMOS, SOI, SiGe, etc., as shown in fig. 10. Temperature detecting diodes (a first diode and a second diode) are arranged on the first circuit board 21, a voltage value V1 generated by the output stage module is monitored by the first diode D1, a voltage value V2 generated by the environment temperature monitoring by the second diode D2 is transmitted to the second circuit board 22 through a bonding wire, and the bias compensation current Iboost is returned to the first circuit board 21 after being processed by circuits on the second circuit board 22.
In order to more clearly illustrate the positive effects of the present invention, an embodiment of the present invention is described below with reference to fig. 10:
in the present embodiment, the driving transistor Q11 and the output transistor Q12 are HBTs;
the dashed waveform corresponding to PA _ EN1 in fig. 10 is a waveform corresponding to the first control signal; the solid line waveform corresponding to PA _ EN2 is a waveform corresponding to the second control signal; the broken-line waveform corresponding to the T1 is a change curve of the junction temperature of the output transistor Q12 along with time when the waveform corresponding to the control signal is the broken-line waveform corresponding to the PA _ EN 1; the solid-line waveform corresponding to the T2 is a variation curve of the junction temperature of the output transistor Q12 along with time when the waveform corresponding to the control signal is the solid-line waveform corresponding to the PA _ EN 2;
the dotted line waveform corresponding to Gn1 is the gain of the power amplifier circuit when the offset compensation module is not provided and the waveform corresponding to the control signal is the dotted line waveform corresponding to PA _ EN 1;
the solid line waveform corresponding to Gn2 is the gain of the power amplifier circuit when the bias compensation module is not provided and the waveform corresponding to the control signal is the solid line waveform corresponding to PA _ EN 2;
the dashed line waveform corresponding to Gy1 is the gain of the power amplifier circuit when the waveform corresponding to the control signal is the dashed line waveform corresponding to PA _ EN1 and the offset compensation module is provided;
the solid line waveform of Gy2 is the gain of the power amplifier circuit when the control signal corresponds to the solid line waveform of PA _ EN2 with the offset compensation module.
As can be seen from Gn1, Gn2 and Gy1, Gy2 in fig. 10, when the power amplifier circuit does not include the offset compensation module 13, the gain is switched from the second control signal to the first control signal, the gain is decreased significantly, and when the power amplifier circuit includes the offset compensation module 13, the gain is switched from the second control signal to the first control signal, the gain tends to be uniform;
the reason for this variation is that the gain of the conventional power amplifier circuit can have a difference of more than 1dB between the duty cycles of 10% (second control signal) and 90% (first control signal). The output power is reduced due to the reduction of the gain, so that the communication speed of the system is influenced, and the change of the gain is caused by the change of the junction temperature of the output transistor and the junction temperature of the driving transistor, so that a bias compensation module is added to compensate the bias current of the driving transistor, and the change can be reduced.
The present invention also provides an electronic device comprising the above-mentioned DEVM compensation circuit for a power amplifier or power amplifier.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (16)
1. A power amplifier circuit is characterized by comprising a driving stage module, an output stage module, a first bias module, a second bias module and a bias compensation module;
the bias compensation module is configured to monitor the temperature of the output stage module to obtain an output stage temperature; the bias compensation module is also configured to monitor the temperature of the environment where the power amplifier is located, and obtain the environment temperature;
the bias compensation module is connected with a control signal, and is electrically connected with the input end of the first bias module and used for: when the duty ratio of the control signal is changed, generating a bias compensation current according to the output stage temperature and the environment temperature, and feeding the bias compensation current back to the first bias module; the duty ratio is a duty ratio control signal for switching a first level signal and a second level signal in the control signal;
the first bias module is connected with the control signal, and is electrically connected with the driving stage module so as to feed back the first bias voltage to the driving stage module according to the bias compensation current when the control signal is the first level signal;
the second bias module is connected with the control signal and is electrically connected with the output stage module so as to feed back the second bias voltage to the output stage module when the control signal is the first level signal;
a first end of the driving stage module is connected with an original input signal, a second end of the driving stage module is electrically connected with a first end of the output stage module, so that the original input signal is amplified based on the first bias voltage to obtain an amplified signal, and the amplified signal is transmitted to the output stage module;
the second end of the output stage module is directly or indirectly electrically connected with an antenna so as to amplify the received amplified signal based on the second bias voltage to obtain a target signal, and the target signal is directly or indirectly transmitted to the antenna.
2. The power amplifier circuit of claim 1, wherein the bias compensation module comprises a temperature difference detection unit, a compensation control unit;
the temperature difference detection unit is configured to monitor the output stage temperature and the ambient temperature to generate a temperature difference signal from the output stage temperature and the ambient temperature, the temperature difference signal being indicative of a temperature difference between the output stage temperature and the ambient temperature;
the output end of the temperature difference detection unit is electrically connected with the first input end of the compensation control unit so as to transmit the temperature difference signal to the compensation control unit;
the second input end of the compensation control unit is connected to the control signal, the output end of the compensation control unit is electrically connected with the input end of the first bias module, when the duty ratio of the control signal is changed, the bias compensation current is generated according to the temperature difference signal, and the bias compensation current is fed back to the first bias module.
3. The power amplifier circuit of claim 2, wherein the temperature difference detecting unit includes a first temperature sensitive element, a second temperature sensitive element, and a subtractor,
the voltage value or the resistance value of the first temperature sensitive element is matched with the temperature of the output stage, the first end of the first temperature sensitive element is electrically connected with the first input end of the subtracter, and the second end of the first temperature sensitive element is grounded;
the voltage value or the resistance value of the second temperature sensitive element is matched with the ambient temperature, the first end of the second temperature sensitive element is electrically connected with the second input end of the subtracter, and the second end of the second temperature sensitive element is grounded;
and the output end of the subtracter is electrically connected with the first input end of the compensation control unit.
4. The power amplifier circuit of claim 3, wherein the temperature difference detecting unit further comprises a first resistor and a second resistor, the first temperature sensitive element is a first diode, the second temperature sensitive element is a second diode,
the voltage value of the first diode is matched with the temperature of the output stage, the anode of the first diode is electrically connected with the first end of the first resistor and the first input end of the subtracter, and the cathode of the first diode is grounded;
the voltage value of the second diode is matched with the ambient temperature, the anode of the second diode is electrically connected with the first end of the second resistor and the second input end of the subtracter, and the cathode of the second diode is grounded;
the second end of the first resistor and the second end of the second resistor are electrically connected with a first power supply.
5. The power amplifier circuit of claim 2, wherein the compensation control unit comprises an analog-to-digital converter, a controller, and a current source sub-unit;
the input end of the analog-to-digital converter is electrically connected with the output end of the temperature difference detection unit, the enable end of the analog-to-digital converter is connected with the control signal, and when the duty ratio of the control signal is changed, the temperature difference signal is subjected to analog-to-digital conversion to obtain a digital temperature difference signal;
the output end of the analog-to-digital converter is electrically connected with the input end of the controller so as to transmit the digital temperature difference signal to the controller;
the output end of the controller is electrically connected with the input end of the current source subunit so as to control the current source subunit to generate bias compensation current according to the digital temperature difference signal;
the output end of the current source subunit is electrically connected with the input end of the first bias module so as to feed back the bias compensation current to the first bias module.
6. The power amplifier circuit of claim 5, wherein the current source subunit comprises M current sources and M switches, a first terminal of each switch is electrically connected to the output terminal of the controller, a second terminal of each switch is electrically connected to a first terminal of a current source, a second terminal of each current source is electrically connected to the input terminal of the first bias module, and the controller controls the number of switches closed in the M switches according to the digital temperature difference signal to control the magnitude of the bias compensation current.
7. The power amplifier circuit of claim 1, wherein the first bias module comprises a first bias transistor, a first bias current source,
the first end of the first bias current source is electrically connected with a second power supply, the controlled end of the first bias current source is connected with the control signal, and the second end of the first bias current source is electrically connected with the control electrode of the first bias transistor;
a control electrode of the first bias transistor is electrically connected with an output end of the bias compensation module;
the first pole of the first bias transistor is electrically connected with the third power supply, and the second pole of the first bias transistor is electrically connected with the first end of the driving stage module.
8. The power amplifier circuit of claim 1, wherein the second bias module comprises a second bias transistor, a second bias current source,
a first end of the second bias current source is electrically connected with a fourth power supply, a controlled end of the second bias current source is connected to the control signal, and a second end of the second bias current source is electrically connected with a control electrode of the second bias transistor;
the first pole of the second bias transistor is electrically connected with a third power supply, and the second pole of the second bias transistor is electrically connected with the first end of the output stage module.
9. The power amplifier circuit of claim 1, wherein the driver stage module comprises a driving transistor, a control electrode of the driving transistor is electrically connected to the output terminal of the first bias module, a first electrode of the driving transistor is electrically connected to a third power supply directly or indirectly, and a second electrode of the driving transistor is grounded.
10. The power amplifier circuit of claim 9, wherein the driver stage module comprises a driving inductor, a first terminal of the driving inductor is electrically connected to the first pole of the driving transistor, and a second terminal of the driving inductor is electrically connected to the third power supply.
11. The power amplifier circuit of claim 1, wherein the output stage module comprises an output transistor, a control electrode of the output transistor is electrically connected to the output terminal of the second bias module, a first electrode of the output transistor is electrically connected to a third power supply directly or indirectly, and a second electrode of the output transistor is grounded.
12. The power amplifier circuit of claim 9, wherein the output stage module comprises an output inductor, a first terminal of the output inductor being electrically connected to the first pole of the output transistor, and a second terminal of the output inductor being electrically connected to the third power supply.
13. The power amplifier circuit of claim 1, further comprising a first capacitor and a second capacitor,
the first end of the first capacitor is connected to the original input signal, and the second end of the first capacitor is electrically connected to the first end of the driving stage module;
the first end of the second capacitor is electrically connected with the second end of the driving stage module, and the second end of the second capacitor is electrically connected with the first end of the output stage module.
14. The power amplifier circuit of claim 1, further comprising an output matching module, a first end of the output matching module being electrically connected to a second end of the output stage module, a second end of the output matching module being electrically connected to the antenna.
15. The power amplifier circuit of claim 1, wherein the driver stage module, the output stage module, the first bias module, and the second bias module are disposed on a first circuit board, and the bias compensation module is partially disposed on a second circuit board.
16. An electronic device comprising the power amplifier circuit of any one of claims 1 to 15.
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| CN202110436459.6A CN113206643A (en) | 2021-04-22 | 2021-04-22 | Power amplifier circuit and electronic device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110436459.6A CN113206643A (en) | 2021-04-22 | 2021-04-22 | Power amplifier circuit and electronic device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116915197A (en) * | 2023-09-06 | 2023-10-20 | 上海安其威微电子科技有限公司 | Power amplifier bias adjusting circuit and power amplifier chip |
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- 2021-04-22 CN CN202110436459.6A patent/CN113206643A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116915197A (en) * | 2023-09-06 | 2023-10-20 | 上海安其威微电子科技有限公司 | Power amplifier bias adjusting circuit and power amplifier chip |
| CN116915197B (en) * | 2023-09-06 | 2023-12-08 | 上海安其威微电子科技有限公司 | Power amplifier bias adjusting circuit and power amplifier chip |
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