CN117978097A - Control circuit and method suitable for doherty power amplifier - Google Patents
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Abstract
The invention provides a control circuit suitable for a doherty power amplifier, which comprises a digital-to-analog conversion chip, a main circuit voltage division circuit, an auxiliary circuit voltage division circuit, a power detection circuit and N doherty power amplifiers, wherein each doherty power amplifier comprises a main circuit power amplifier and an auxiliary circuit power amplifier; the digital-to-analog conversion chip provides a main circuit grid voltage and an auxiliary circuit grid voltage, wherein the main circuit grid voltage is respectively input to a main circuit power amplifier in a main circuit voltage dividing circuit and a 1 st Doherty power amplifier, and the auxiliary circuit grid voltage is respectively input to a main circuit power amplifier in an auxiliary circuit voltage dividing circuit and a 1 st Doherty power amplifier; the main circuit voltage dividing circuit and the auxiliary circuit voltage dividing circuit respectively divide the voltage and then output the divided voltage to other power amplifiers; the power detection circuit is used for generating a main path control signal and an auxiliary path control signal. The invention reduces the number of digital-to-analog conversion chips, reduces the complexity of circuit wiring, reduces the circuit area and the whole volume of the base station, and effectively reduces the whole cost.
Description
Technical Field
The invention relates to the field of power amplification, in particular to a control circuit and a control method suitable for a doherty power amplifier.
Background
Personal wireless terminals such as mobile phones, tablet personal computers and smart watches are increasingly popular in daily life, and operators need to continuously deploy multi-band and multi-system base station equipment in order to meet different communication demands.
In various base stations, the rf power amplifier is one of the core modules, and its power consumption often accounts for about 70% of the total power consumption, and its linear performance also relates to the signal quality of the base station. Therefore, it is a key issue in base station design today to study how to compromise and improve the efficiency and linearity capabilities of a radio frequency power amplifier.
Doherty (Doherty) power amplifier is one of the most commonly used techniques in current wireless communication base stations, and includes a main-path power amplifier and an auxiliary-path power amplifier. The working principle is that the grid bias voltages of the main power amplifier and the auxiliary power amplifier are respectively configured through the control circuit so that the main power amplifier and the auxiliary power amplifier work in proper states; with the increase of input power, dynamic traction is carried out between the two, and high-efficiency and high-linearity output within a certain output power range is realized.
However, in the practical design process, it is found that, in order to satisfy the requirements of multiple operators and multiple wireless terminals, the current wireless base station often integrates multiple frequency bands, multiple types of radio frequency power amplifiers, and multiple channels of Active Antenna System (AAS) base stations such as 32/64 in a single wireless base station, which is also increasing. Accordingly, this also presents challenges and difficulties for the control circuit design of the radio frequency power amplifier. The control circuit for the radio frequency power amplifier adopts a one-to-one grid voltage circuit control architecture, a large number of digital-to-analog conversion chips are used, and the difficulties in circuit wiring and layout and the increase of the whole volume and cost are brought. Therefore, research on a new control circuit architecture suitable for various radio frequency power amplifiers is of great significance to the design of the current wireless base station equipment.
As shown in fig. 1, the classical doherty power amplifier is composed of a power divider, a main power amplifier, an auxiliary power amplifier, and corresponding matching circuits. The bias grid voltage is configured through the control circuit, so that the main circuit power amplifier works in class AB, and the auxiliary circuit power amplifier works in class C. When the input signal power is smaller, the auxiliary power amplifier is in a non-conducting state and presents a high-resistance state, and the signals all enter the main power amplifier through the power distributor; when the input signal is gradually increased, the auxiliary power amplifier is started, and the main power amplifier is pulled, so that part of the input signal enters the auxiliary power amplifier.
Therefore, the doherty power amplifier needs to be controlled by a control circuit when in operation, so that the main circuit power amplifier and the auxiliary circuit power amplifier are respectively in proper states. If a plurality of die core sheets are used for controlling the grid voltage of the doherty power amplifier one by one, a control circuit of the doherty power amplifier is bulked; in an Active Antenna System (AAS) base station of 32 channels or 64 channels, the cost is greatly increased. If the grid voltage multiplexing control circuit scheme is directly adopted, namely, one bias voltage is supplied to main-path power amplifiers or auxiliary-path power amplifiers of a plurality of power amplifiers; the scheme can reduce the number of digital-to-analog conversion chips used, but because the power amplifier has batch fluctuation difference, the static working points of the power amplifier are far away, so that the power amplifier cannot be in an optimal working state, and the efficiency and the linearity performance are reduced; and the static working point deviation among different power amplifiers is larger, which is not suitable for the design of the multi-band and multi-system wireless base station.
Disclosure of Invention
Aiming at the problems existing in the prior art, the control circuit and the method for the doherty power amplifier are provided, the dynamic voltage division is carried out by switching off the radio frequency diode, the grid voltage bias of the power amplifier can be finished by using fewer digital-to-analog conversion chips, and meanwhile, the efficiency and the linearity capability of each power amplifier are ensured.
The first aspect of the present invention provides a control circuit suitable for a doherty power amplifier, comprising a digital-to-analog conversion chip, a main circuit voltage dividing circuit, an auxiliary circuit voltage dividing circuit, a power detection circuit and N doherty power amplifiers, wherein each doherty power amplifier comprises a main circuit power amplifier and an auxiliary circuit power amplifier; the digital-to-analog conversion chip provides a main circuit grid voltage and an auxiliary circuit grid voltage, wherein the main circuit grid voltage is respectively input to a main circuit power amplifier in a main circuit voltage dividing circuit and a1 st Doherty power amplifier, and the auxiliary circuit grid voltage is respectively input to a main circuit power amplifier in an auxiliary circuit voltage dividing circuit and a1 st Doherty power amplifier; the main circuit voltage dividing circuit is used for dividing the main circuit grid voltage according to a main circuit control signal and respectively transmitting the divided voltage to a main circuit power amplifier in the 2 nd to N th Doherty power amplifiers; the auxiliary circuit voltage dividing circuit is used for dividing the auxiliary circuit grid voltage according to an auxiliary circuit control signal and respectively transmitting the divided voltage to a main circuit power amplifier in the 2 nd to N th Doherty power amplifiers; the power detection circuit receives the power output by all the main power amplifier and the auxiliary power amplifier and generates a main control signal and an auxiliary control signal.
Further, the main circuit voltage dividing circuit comprises M microstrip circuits and at least 1 branch circuit which are sequentially connected in series; the 1 st microstrip circuit receives the main circuit gate voltage, and the M th microstrip circuit outputs the voltage after voltage division; the branch comprises a radio frequency diode and a branch microstrip circuit, one end of the radio frequency diode is connected between any adjacent microstrip circuits, and the other end of the radio frequency diode is connected to the branch microstrip circuit; the radio frequency diode is controlled to be turned on or turned off by a main control signal, wherein M is larger than 2.
Further, the main circuit voltage dividing circuit further comprises a main circuit voltage dividing bias circuit, and the main circuit voltage dividing bias circuit is used for receiving a main circuit control signal and generating bias voltage to a radio frequency diode in the main circuit voltage dividing circuit to control the radio frequency diode to be turned on or turned off.
Further, the auxiliary circuit voltage dividing circuit includes: comprises M microstrip circuits and at least 1 branch circuit which are connected in series in sequence; the 1 st microstrip circuit receives the gate voltage of the auxiliary circuit, and the M th microstrip circuit outputs the voltage after voltage division; the branch comprises a radio frequency diode and a branch microstrip circuit, one end of the radio frequency diode is connected between any adjacent microstrip circuits, and the other end of the radio frequency diode is connected to the branch microstrip circuit; the radio frequency diode is controlled to be conducted or closed by an auxiliary circuit control signal.
Further, the auxiliary circuit voltage dividing circuit further comprises an auxiliary circuit voltage dividing bias circuit, and the auxiliary circuit voltage dividing bias circuit is used for receiving an auxiliary circuit control signal and generating bias voltage to a radio frequency diode in the auxiliary circuit voltage dividing circuit to control the radio frequency diode to be conducted or closed.
A second aspect of the present invention proposes a control method for a doherty power amplifier, which is applied to the control circuit for a doherty power amplifier according to the first aspect of the present invention, comprising:
Step 1, obtaining a rated grid voltage value of each doherty power amplifier through grid voltage calibration;
Step 2, determining the resistance of the main circuit voltage dividing circuit according to the required voltage dividing scheme and the rated grid voltage value, and controlling the main circuit control signal to switch on and off the radio frequency diode on the main circuit voltage dividing circuit;
and 3, determining the resistance of the auxiliary circuit voltage dividing circuit according to the required voltage dividing scheme and the rated grid voltage value, and controlling the auxiliary circuit control signal to switch on and off the radio frequency diode on the main circuit voltage dividing circuit.
Further, step 4 is included, in the power back-off state, the main circuit voltage dividing circuit is unchanged, and the auxiliary circuit voltage dividing circuit is set to be non-conductive, namely, the auxiliary circuit power amplifiers of the 2 nd to N doherty power amplifiers are in the off state.
Further, step 5 is further included, and when the power is further backed down, the main circuit voltage dividing circuit and the auxiliary circuit voltage dividing circuit are not conducted, and only the 1 st power amplifier is in a working state.
Further, the partial pressure scheme includes:
1) Maximum partial pressure setting:
For the 2 nd to nth doherty power amplifiers, the output voltages are M2 and P2, i.e. the maximum gate voltage bias; under the configuration, better linear performance can be obtained;
2) Minimum partial pressure setting:
for the 2 nd to nth doherty power amplifiers, the output voltages are Mn and Pn, i.e., the minimum gate voltage bias; under the configuration, better efficiency can be obtained;
3) Average partial pressure setting:
For the 2 nd to nth doherty power amplifiers, the output voltages are (m2+m3+ … … +mn)/(N-1) and (p2+p3+ … … +pn)/(N-1), with this configuration, a more balanced performance and efficiency are obtained;
Wherein M1, M2, … …, mn are the rated main gate voltage values of the main power amplifier of the N doherty power amplifiers, and P1, P2, … …, pn are the rated main gate voltage values of the auxiliary power amplifier of the N doherty power amplifiers.
Compared with the prior art, the beneficial effects of adopting the technical scheme are as follows: the invention is applied to the doherty power amplifier in the design of the wireless base station, can reduce the number of digital-to-analog conversion chips used while guaranteeing the efficiency and the linear performance of the power amplifier, reduces the complexity of circuit wiring, reduces the circuit area and the whole volume of the base station, and effectively reduces the whole cost.
Drawings
Fig. 1 is a schematic diagram of a typical doherty power amplifier.
Fig. 2 shows a control circuit for a doherty power amplifier according to the present invention.
FIG. 3 is a schematic diagram of a main circuit voltage divider circuit according to an embodiment of the invention.
FIG. 4 is a graph comparing the efficiency of the present invention with that of the conventional scheme.
Detailed Description
Embodiments of the present application are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar modules or modules having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the application. On the contrary, the embodiments of the application include all alternatives, modifications and equivalents as may be included within the spirit and scope of the appended claims.
Example 1
In order to ensure the efficiency and the linearity performance of the power amplifier, the number of digital-to-analog conversion chips is reduced, the wiring complexity of a circuit is reduced, the circuit area and the whole size of a base station are reduced, and the whole cost is effectively reduced. The embodiment of the invention provides a control circuit suitable for a doherty power amplifier. The scheme is as follows:
Referring to fig. 2, the control circuit includes a digital-to-analog conversion chip, a main circuit voltage dividing circuit, an auxiliary circuit voltage dividing circuit, a power detection circuit and N doherty power amplifiers.
Each doherty power amplifier includes a main path power amplifier and an auxiliary path power amplifier. The main circuit power amplifier and the auxiliary circuit power amplifier can respectively work in class AB and class C through grid voltage bias. When the input signal is smaller, the main power amplifier is in a working state, the auxiliary power amplifier is in a closing state, and the single tube works to obtain better efficiency; when the input signal is increased, the auxiliary power amplifier is turned on, and part of the input signal enters the auxiliary path through the power divider, and the main power amplifier and the auxiliary power amplifier work simultaneously at the moment to obtain better linear performance.
In order to realize dynamic voltage division, in the embodiment, a main circuit voltage division circuit and an auxiliary circuit voltage division circuit are introduced. The digital-to-analog conversion chip provides a main circuit gate voltage and an auxiliary circuit gate voltage, wherein the main circuit gate voltage is respectively input to a main circuit power amplifier in the main circuit voltage dividing circuit and the 1 st doherty power amplifier, and the auxiliary circuit gate voltage is respectively input to a main circuit power amplifier in the auxiliary circuit voltage dividing circuit and the 1 st doherty power amplifier.
Specifically, the main circuit voltage dividing circuit is used for dividing the main circuit gate voltage according to the main circuit control signal and respectively sending the divided voltage to the main circuit power amplifier in the 2 nd to N th Doherty power amplifiers. The auxiliary circuit voltage dividing circuit is used for dividing the auxiliary circuit grid voltage according to an auxiliary circuit control signal and sending the divided voltage to a main circuit power amplifier in the 2 nd to N th Doherty power amplifiers respectively.
The main control signal and the auxiliary control signal required by the main voltage dividing circuit and the auxiliary voltage dividing circuit are determined according to the output power of the Doherty power amplifier obtained by the power detection circuit in real time, so that the voltage dividing capacity of the voltage dividing circuit is dynamically adjusted, and the power amplification efficiency is improved.
Referring to fig. 3, the main circuit voltage divider circuit includes M microstrip circuits and at least 1 branch circuit connected in series; the 1 st microstrip circuit receives the main circuit gate voltage, and the M th microstrip circuit outputs the voltage after voltage division; the branch comprises a radio frequency diode and a branch microstrip circuit, one end of the radio frequency diode is connected between any adjacent microstrip circuits, and the other end of the radio frequency diode is connected to the branch microstrip circuit; the radio frequency diode is controlled to be turned on or turned off by a main control signal, wherein M is larger than 2. In one embodiment, the M microstrip circuits and the branch microstrip circuit may be the same or different.
In practical application, the number of the branches and the microstrip circuits in the main circuit voltage dividing circuit is selected according to the requirement. For the main voltage divider circuit, when all the radio frequency diodes are in the off state, the input voltage is all supplied to the output voltage, i.e. in the non-voltage dividing state. When one of the radio frequency diodes is in a conducting state, the voltage dividing circuit is equivalent to a resistor to ground in parallel, and only partial voltage is output; when a plurality of or all of the radio frequency diodes are in a conducting state, the voltage dividing circuit is equivalent to a plurality of resistors to ground which are connected in parallel, and the output voltage of the voltage dividing circuit also changes correspondingly. The more the radio frequency diodes are designed on the voltage dividing circuit, the larger and finer the voltage dividing range.
In one embodiment, the main voltage dividing circuit further includes a main voltage dividing bias circuit, and the main voltage dividing bias circuit is configured to receive the main control signal and generate a bias voltage to a radio frequency diode in the main voltage dividing circuit, and control the radio frequency diode to be turned on or turned off.
In one embodiment, the auxiliary circuit voltage divider circuit includes: comprises M microstrip circuits and at least 1 branch circuit which are connected in series in sequence; the 1 st microstrip circuit receives the gate voltage of the auxiliary circuit, and the M th microstrip circuit outputs the voltage after voltage division; the branch comprises a radio frequency diode and a branch microstrip circuit, one end of the radio frequency diode is connected between any adjacent microstrip circuits, and the other end of the radio frequency diode is connected to the branch microstrip circuit; the radio frequency diode is controlled to be conducted or closed by an auxiliary circuit control signal. In one embodiment, the auxiliary voltage dividing circuit further comprises an auxiliary voltage dividing bias circuit, and the auxiliary voltage dividing bias circuit is used for receiving an auxiliary control signal and generating bias voltage to a radio frequency diode in the auxiliary voltage dividing circuit to control the radio frequency diode to be turned on or turned off.
In one embodiment, the auxiliary circuit voltage dividing circuit may be the same as the main circuit voltage dividing circuit, or may be different, and the number of the radio frequency diodes/branches and the microstrip circuits may be adjusted according to the requirements, but the working mode of the auxiliary circuit voltage dividing circuit is similar to that of the main circuit voltage dividing circuit, and will not be described in detail.
Referring to fig. 2, the operation is described by taking a 1-N architecture as an example, and under this architecture, only one two digital-to-analog conversion chips are needed to complete the power supply of the gate voltage of the N-doherty power amplifier.
The main circuit grid voltage directly supplies power to the main circuit power amplifier of the doherty power amplifier 1, and after passing through the main circuit voltage dividing circuit, the main circuit grid voltage of the doherty power amplifier 2 to the doherty power amplifier N is supplied; the auxiliary gate voltage directly supplies power to the auxiliary power amplifier of the doherty power amplifier 1, and after passing through the auxiliary voltage dividing circuit, the auxiliary gate voltage of the doherty power amplifier 2 to the doherty power amplifier N is supplied.
According to the determined voltage division scheme, the voltage division circuit is combined, and the radio frequency diode on the voltage division circuit is controlled to be switched on and off through the main circuit control signal and the auxiliary circuit control signal respectively, so that voltage division is completed.
When the power detection circuit detects that the power is reduced, the radio frequency diode on the voltage dividing circuit is controlled to be turned on and off through the main circuit control signal and the auxiliary circuit control signal, so that the voltage dividing scheme is changed, the linearity performance is ensured, and meanwhile, the better efficiency is obtained.
Referring to fig. 4, there are shown an efficiency curve of a conventional doherty power amplifier and an efficiency curve of the doherty power amplifier under the control circuit according to the present invention, and it can be seen that the control circuit according to the present invention can effectively improve efficiency under the same output power.
Example 2
The present embodiment 1 proposes a control method applied to a doherty power amplifier, applied to the control circuit applied to a doherty power amplifier proposed in embodiment 1, comprising:
and step 1, obtaining the rated grid voltage value of each doherty power amplifier through grid voltage calibration.
In the embodiment, rated main path gate voltage values of N doherty power amplifiers are set to be M1, M2, … … and Mn respectively, and M1 is more than M2 is more than … … and Mn is more than … …; the gate voltage values of the fixed auxiliary circuits are P1, P2, … … and Pn respectively, and P1> P2> … … > Pn.
And 2, determining the resistance of the main circuit voltage dividing circuit according to the required voltage dividing scheme and the rated grid voltage value, and controlling the main circuit control signal to switch on and off the radio frequency diode on the main circuit voltage dividing circuit.
The voltage division scheme needs to be set according to products with different power levels and different frequency bands, and the voltage division scheme is also an advantage that the voltage division scheme can be flexibly applied to various designs. The following are common initial partial pressure schemes:
1) Maximum partial pressure setting:
For the doherty power amplifier 2 to the doherty power amplifier N, the output voltages are M2 and P2, i.e. the maximum gate voltage bias; under the configuration, better linear performance can be obtained;
2) Minimum partial pressure setting:
For the doherty power amplifier 2 to the doherty power amplifier N, the output voltages are Mn and Pn, i.e. the minimum gate voltage bias; under the configuration, better efficiency can be obtained;
3) Average partial pressure setting:
For the doherty power amplifier 2 to the doherty power amplifier N, the output voltages are (m2+m3+ … … +mn)/(N-1) and (p2+p3+ … … +pn)/(N-1), and a more balanced performance and efficiency are obtained with this configuration.
And 3, determining the resistance of the auxiliary circuit voltage dividing circuit according to the required voltage dividing scheme and the rated grid voltage value, and controlling the auxiliary circuit control signal to switch on and off the radio frequency diode on the main circuit voltage dividing circuit.
According to the aforementioned conditions and the prescribed voltage division scheme, the main gate voltage output of the doherty power amplifier 1 is M1, and then the main gate voltage output to the remaining doherty power amplifiers is (m2+m3+ … … +mn)/f (Pout, M2, M3, …, mn), where Pout is the output power detected by the power detection circuit; and combining with the design of the main circuit voltage dividing circuit, calculating to obtain a main circuit voltage dividing resistor R1, and controlling the main circuit control signal to switch on and off the radio frequency diode on the main circuit voltage dividing circuit.
According to the aforementioned conditions and the prescribed voltage division scheme, the auxiliary gate voltage output of the doherty power amplifier 1 is P1, and then the auxiliary gate voltage output to the remaining doherty power amplifiers is (p2+p3+ … … +pn)/f (Pout, P2, P3, …, pn), where Pout is the detected output power. And combining with the design of a voltage dividing circuit, calculating to obtain a voltage dividing resistor Rm1 of the auxiliary circuit, and controlling the switching-on and switching-off of the radio frequency diode on the voltage dividing circuit of the auxiliary circuit by an auxiliary circuit control signal.
In one embodiment, if the power detection circuit detects that the doherty power amplifier is in the back-off state, the main circuit voltage division circuit is unchanged, and the auxiliary circuit voltage division circuit is set to be non-conductive, i.e. the auxiliary circuit power amplifiers of the 2 nd to N th doherty power amplifiers are in the off state, thereby improving the power amplification efficiency.
Further, if the power continues to fall back, the main circuit voltage dividing circuit and the auxiliary circuit voltage dividing circuit are not conducted, and only the 1 st doherty power amplifier is in a working state, so that the efficiency is further improved, the standby power consumption is reduced, and the like.
The control method provided by the embodiment changes the control signal of the voltage dividing circuit according to the change of the system power, so that the grid voltage level output to the doherty power amplifier is changed, and the doherty power amplifier works in different states, so that the efficiency is improved.
It should be noted that, in the description of the embodiments of the present invention, unless explicitly specified and limited otherwise, the terms "disposed," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; may be directly connected or indirectly connected through an intermediate medium. The specific meaning of the above terms in the present invention will be understood in detail by those skilled in the art; the accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
While embodiments of the present application have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the application, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the application.
Claims (9)
1. The control circuit is characterized by comprising a digital-to-analog conversion chip, a main circuit voltage division circuit, an auxiliary circuit voltage division circuit, a power detection circuit and N doherty power amplifiers, wherein each doherty power amplifier comprises a main circuit power amplifier and an auxiliary circuit power amplifier; the digital-to-analog conversion chip provides a main circuit grid voltage and an auxiliary circuit grid voltage, wherein the main circuit grid voltage is respectively input to a main circuit power amplifier in a main circuit voltage dividing circuit and a1 st Doherty power amplifier, and the auxiliary circuit grid voltage is respectively input to a main circuit power amplifier in an auxiliary circuit voltage dividing circuit and a1 st Doherty power amplifier; the main circuit voltage dividing circuit is used for dividing the main circuit grid voltage according to a main circuit control signal and respectively transmitting the divided voltage to a main circuit power amplifier in the 2 nd to N th Doherty power amplifiers; the auxiliary circuit voltage dividing circuit is used for dividing the auxiliary circuit grid voltage according to an auxiliary circuit control signal and respectively transmitting the divided voltage to a main circuit power amplifier in the 2 nd to N th Doherty power amplifiers; the power detection circuit receives the power output by all the main power amplifier and the auxiliary power amplifier and generates a main control signal and an auxiliary control signal.
2. The control circuit for a doherty power amplifier of claim 1 wherein the main path voltage divider circuit comprises M microstrip circuits and at least 1 branch in series in sequence; the 1st microstrip circuit receives the main circuit gate voltage, and the M th microstrip circuit outputs the voltage after voltage division; the branch comprises a radio frequency diode and a branch microstrip circuit, one end of the radio frequency diode is connected between any adjacent microstrip circuits, and the other end of the radio frequency diode is connected to the branch microstrip circuit; the radio frequency diode is controlled to be turned on or turned off by a main control signal, wherein M is larger than 2.
3. The control circuit for a doherty power amplifier of claim 2 wherein the main circuit voltage divider circuit further comprises a main circuit voltage divider bias circuit for receiving the main circuit control signal and generating a bias voltage to the rf diode in the main circuit voltage divider circuit to control the rf diode to turn on or off.
4. The control circuit for a doherty power amplifier of claim 1 wherein the auxiliary circuit voltage divider circuit comprises: comprises M microstrip circuits and at least 1 branch circuit which are connected in series in sequence; the 1 st microstrip circuit receives the gate voltage of the auxiliary circuit, and the M th microstrip circuit outputs the voltage after voltage division; the branch comprises a radio frequency diode and a branch microstrip circuit, one end of the radio frequency diode is connected between any adjacent microstrip circuits, and the other end of the radio frequency diode is connected to the branch microstrip circuit; the radio frequency diode is controlled to be conducted or closed by an auxiliary circuit control signal.
5. The control circuit for a doherty power amplifier of claim 4 wherein the auxiliary voltage divider circuit further comprises an auxiliary voltage divider bias circuit for receiving an auxiliary control signal and generating a bias voltage to a radio frequency diode in the auxiliary voltage divider circuit for controlling the radio frequency diode to turn on or off.
6. A control method applied to a doherty power amplifier, applied to the control circuit applied to a doherty power amplifier as claimed in any one of claims 1 to 5, characterized by comprising:
Step 1, obtaining a rated grid voltage value of each doherty power amplifier through grid voltage calibration;
Step 2, determining the resistance of the main circuit voltage dividing circuit according to the required voltage dividing scheme and the rated grid voltage value, and controlling the main circuit control signal to switch on and off the radio frequency diode on the main circuit voltage dividing circuit;
and 3, determining the resistance of the auxiliary circuit voltage dividing circuit according to the required voltage dividing scheme and the rated grid voltage value, and controlling the auxiliary circuit control signal to switch on and off the radio frequency diode on the main circuit voltage dividing circuit.
7. The method of claim 6, further comprising step 4, wherein in the power back-off state, the main circuit voltage divider circuit is unchanged, and the auxiliary circuit voltage divider circuit is set to be non-conductive, i.e., the auxiliary circuit power amplifiers of the 2 nd to nth doherty power amplifiers are in an off state.
8. The method of claim 7, further comprising step 5, wherein the main voltage divider circuit and the auxiliary voltage divider circuit are both set to be non-conductive when the power is further backed off, and only the 1 st power amplifier is in operation.
9. The method for controlling a doherty power amplifier of claim 7, wherein the voltage dividing scheme comprises:
1) Maximum partial pressure setting:
For the 2 nd to nth doherty power amplifiers, the output voltages are M2 and P2, i.e. the maximum gate voltage bias; under the configuration, better linear performance can be obtained;
2) Minimum partial pressure setting:
for the 2 nd to nth doherty power amplifiers, the output voltages are Mn and Pn, i.e., the minimum gate voltage bias; under the configuration, better efficiency can be obtained;
3) Average partial pressure setting:
For the 2 nd to nth doherty power amplifiers, the output voltages are (m2+m3+ … … +mn)/(N-1) and (p2+p3+ … … +pn)/(N-1), with this configuration, a more balanced performance and efficiency are obtained;
Wherein M1, M2, … …, mn are the rated main gate voltage values of the main power amplifier of the N doherty power amplifiers, and P1, P2, … …, pn are the rated main gate voltage values of the auxiliary power amplifier of the N doherty power amplifiers.
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| CN202311866439.8A CN117978097A (en) | 2023-12-28 | 2023-12-28 | Control circuit and method suitable for doherty power amplifier |
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| CN202311866439.8A CN117978097A (en) | 2023-12-28 | 2023-12-28 | Control circuit and method suitable for doherty power amplifier |
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