CN110166004B - Method and device for reducing power consumption of power amplifier - Google Patents
Method and device for reducing power consumption of power amplifier Download PDFInfo
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- CN110166004B CN110166004B CN201910313122.9A CN201910313122A CN110166004B CN 110166004 B CN110166004 B CN 110166004B CN 201910313122 A CN201910313122 A CN 201910313122A CN 110166004 B CN110166004 B CN 110166004B
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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
- H03F1/02—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation
- H03F1/0205—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation in transistor amplifiers
- H03F1/0211—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation in transistor amplifiers with control of the supply voltage or current
- H03F1/0244—Stepped control
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Abstract
The application discloses a method for reducing power consumption of a power amplifier, which comprises the following steps. Step 31: average power tracking is used for the supply voltage of the power amplifier, i.e. a different supply voltage value is used for each transmit power value of the power amplifier. Step 32: the bias voltage or bias current of the power amplifier is discretely controlled, namely, the bias voltage or bias current value of the same power amplifier is adopted for a plurality of adjacent transmission power values of the power amplifier, and the number of all the transmission power values of the power amplifier is larger than that of all the bias voltages or bias current values of the power amplifier. The sequence of steps 31, 32 is either interchanged or performed simultaneously. The method for reducing the power consumption of the power amplifier not only meets the requirement of reducing the power consumption, but also is easy to realize, can meet various radio frequency performance indexes, and can reduce the testing workload.
Description
Technical Field
The present application relates to a control method of a power amplifier.
Background
In a mobile communication system, a User Equipment (UE) has a limited battery capacity due to portability. On the premise of a constant battery capacity, how to reduce the power consumption of the user equipment is an important issue. For the baseband chip in the user equipment, power consumption is mainly concentrated on the transmitting part of the baseband chip, and the transmitting part consumes Power most, namely a Power Amplifier (PA). It can be said that once the power consumption of the power amplifier is controlled, the power consumption of the entire user equipment is also controlled.
In the prior art, in order to control the power consumption of the power amplifier, the power supply Voltage (VCC) of the power amplifier may be adjusted according to different transmission powers. The larger the transmission power is, the higher the supply voltage of the power amplifier is; the smaller the transmit power, the smaller the supply voltage of the power amplifier; thus, the purpose of saving power consumption can be achieved.
Meanwhile, since the current power amplifier is basically controlled by MIPI (Mobile Industry Processor Interface ), this provides a condition for adjusting the Bias Voltage (Bias Voltage) or Bias current (Bias current) of the power amplifier according to different transmit powers. The manufacturer of the power amplifier can provide a parameter list of the bias voltage or bias current of the power amplifier corresponding to different output powers, and the power amplifier can work in the optimal state by using the bias voltage or bias current in the parameter list to achieve the most power-saving state.
Disclosure of Invention
The technical problem to be solved by the application is to provide a method for reducing power consumption of a power amplifier, and meanwhile, test workload is reduced. For this purpose, the present application also provides an apparatus for reducing power consumption of a power amplifier.
In order to solve the technical problems, the application provides a method for reducing power consumption of a power amplifier, which comprises the following steps. Step 31: average power tracking is used for the supply voltage of the power amplifier, i.e. a different supply voltage value is used for each transmit power value of the power amplifier. Step 32: the bias voltage or bias current of the power amplifier is discretely controlled, namely, the bias voltage or bias current value of the same power amplifier is adopted for a plurality of adjacent transmission power values of the power amplifier, and the number of all the transmission power values of the power amplifier is larger than that of all the bias voltages or bias current values of the power amplifier. The sequence of steps 31, 32 is either interchanged or performed simultaneously.
The method for reducing the power consumption of the power amplifier not only meets the requirement of reducing the power consumption, but also is easy to realize, can meet various radio frequency performance indexes, and can reduce the testing workload.
Preferably, in the step 31, the correspondence between the transmission power value and the supply voltage value is obtained in a transmission power calibration phase of the ue. This is a preferred implementation employing average power tracking for the supply voltage.
Preferably, in the step 31, the supply voltage value of the power amplifier is defined between a minimum value and a maximum value. This is to keep the power amplifier operating as much as possible in the linear regime.
Further, in the step 32, the correspondence between the transmission power value and the bias voltage or bias current value is obtained by: the adjacent transmitting power values of the power amplifier are divided into a plurality of groups, all the transmitting power values in one group are jointly corresponding to the same bias voltage or bias current value, and the transmitting power values of different groups are corresponding to different bias voltage or bias current values. This is a preferred implementation of discrete control of the bias voltage or bias current, which reduces the power consumption of the power amplifier to some extent, while significantly reducing the test effort.
The application also provides a device for reducing the power consumption of the power amplifier, which comprises the power amplifier, a power supply unit and a biasing unit. The power supply unit supplies power to the power amplifier in an average power tracking mode, namely, different power supply voltage values are adopted for each transmitting power value of the power amplifier. The bias unit supplies bias voltage or bias current to the power amplifier in a discrete control mode, namely, the same bias voltage or bias current value is adopted for a plurality of adjacent transmission power values of the power amplifier, and the number of all the transmission power values of the power amplifier is larger than that of all the bias voltage or bias current values of the power amplifier.
The device for reducing the power consumption of the power amplifier not only meets the requirement of reducing the power consumption, but also is easy to realize, can meet various radio frequency performance indexes, and can reduce the testing workload.
Preferably, the correspondence between the transmission power value adopted by the power supply unit and the supply voltage value is obtained in a transmission power calibration phase of the user equipment. This is a preferred implementation employing average power tracking for the supply voltage.
Preferably, the power supply unit provides a supply voltage value defined between a minimum value and a maximum value. This is to keep the power amplifier operating as much as possible in the linear regime.
Preferably, the correspondence between the transmission power value adopted by the bias unit and the bias voltage or bias current value is obtained by: the adjacent transmitting power values of the power amplifier are divided into a plurality of groups, all the transmitting power values in one group are jointly corresponding to the same bias voltage or bias current value, and the transmitting power values of different groups are corresponding to different bias voltage or bias current values. This is a preferred implementation of discrete control of the bias voltage or bias current, which reduces the power consumption of the power amplifier to some extent, while significantly reducing the test effort.
The technical effects achieved by the present application are as follows. First, a continuous average power tracking mode is adopted to provide a supply voltage, so that different transmission power values correspond to the supply voltage value with the lowest power consumption. Second, the bias voltage (or bias current) is provided by adopting a discrete control mode, so that the power consumption of the power amplifier is reduced to a certain extent, and meanwhile, the testing workload is greatly reduced. Third, the implementation difficulty is simplified, the implementation efficiency is improved, and the working efficiency of the power amplifier is improved.
Drawings
Fig. 1 is a schematic diagram of the energy waste of a power amplifier powered with a fixed voltage.
Fig. 2 is a schematic diagram of energy waste for a power amplifier using variable voltage supply (average power tracking).
Fig. 3 is a flow chart illustrating an embodiment of a method for reducing power consumption of a power amplifier provided herein.
Fig. 4 is a block schematic diagram of one embodiment of an apparatus for reducing power consumption of a power amplifier provided herein.
The reference numerals in the drawings illustrate: reference numeral 41 denotes a power amplifier, 42 denotes a power supply unit, and 43 denotes a bias unit.
Detailed Description
The average power tracking (average power tracking, APT) is to dynamically adjust the supply voltage of the power amplifier according to the different transmit powers of the power amplifier in the user equipment. Taking LTE FDD (Frequency Division Duplexing, frequency division duplex) user equipment as an example, LTE user equipment typically has a minimum transmission time unit of 1ms. Since the transmit power is controlled by a Base Station (BS), the transmit power of the user equipment is often varied. Referring to fig. 1, if a fixed voltage is used to power the power amplifier, it can be seen that approximately 80% of the energy is wasted. Referring to fig. 2, if the power supply voltage is adjusted according to the transmission power of the power amplifier in 1ms, that is, the variable voltage is used to supply power to the power amplifier, the waste of power supply energy can be greatly reduced, and the purpose of power saving is achieved. The black areas in fig. 1 and 2 represent the energy that the power amplifier uses for emission, and the diagonally filled areas represent the portions where the supplied energy is wasted. This is the principle that average power tracking can save power consumption of the power amplifier.
In the factory stage, the user equipment needs to calibrate the transmitting power in order to meet the protocol requirements and the production requirements. After calibration, the accuracy of the transmitting power of the user equipment can be greatly improved. The implementation of average power tracking is mainly done in the calibration phase, i.e. different supply voltages are used for the power amplifier depending on the transmit power at the time of calibration. After calibration, the power supply voltage value and the transmitting power value of the power amplifier are correspondingly filled into a calibration table, and the calibration table is burnt into a nonvolatile memory (such as flash) of the user equipment for the user equipment to use. When transmitting, the user equipment searches the power supply voltage of the corresponding power amplifier in the calibration table according to the transmitting power of the user equipment, and then controls the direct current-direct current (DC-DC) converter to provide the power supply voltage of the power amplifier.
The implementation of average power tracking is divided into two types. This is continuous average power tracking if each transmit power of the power amplifier corresponds to a different power amplifier supply voltage. Referring to table 1, a calibration table of continuous average power tracking is described for each transmit power P (n) of the power amplifier, and the supply voltage VCC (n) of the power amplifier is different. If several transmit powers of a power amplifier all correspond to the supply voltage of the same power amplifier, this is a discrete average power tracking.
Table 1: calibration table for continuous average power tracking
On the premise of meeting the radio frequency performance specified by the protocol, the power supply voltage of the power amplifier can be reduced as much as possible to achieve the most power saving. Obviously, continuous average power tracking is more power efficient than discrete average power tracking because it is done that each transmit power can use a different supply voltage. Continuous average power tracking, however, requires testing for each transmit power to meet radio frequency performance, taking more time. Discrete average power tracking, while not capable of minimizing the supply voltage for each transmit power, is relatively easy to implement.
Since current power amplifiers are mostly MIPI controlled, this provides the convenience of modifying the bias voltage (or bias current) of the power amplifier. The power amplifier vendor will also provide a list of parameters of the optimum bias voltage (or bias current) for the different transmit powers. If for power saving purposes it is the best approach that each transmit power of the power amplifier corresponds to a different supply voltage and a different bias voltage (or bias current). Referring to table 2, a look-up table of continuous average power tracking and continuous Bias control is described, wherein each transmit power P (n) of the power amplifier corresponds to a different power amplifier supply voltage VCC (n) and a different power amplifier Bias voltage (or Bias current) Bias (n).
Table 2: lookup tables for continuous average power tracking and continuous bias control
The control method for continuous average power tracking and continuous bias can naturally minimize the power consumption of the power amplifier, but the difficulty of realizing continuous two-dimensional control of the power amplifier is high, and the radio frequency performance can not meet the index easily due to the difference between chips. To implement this method, the workload is huge, the test task is heavy, and it is not cost-effective in terms of efficiency.
The application provides a hybrid average power tracking method, which not only can dynamically adjust the power supply voltage of a power amplifier according to different transmitting power of the power amplifier in user equipment, but also can use the bias voltage of different power amplifiers according to different transmitting power of the power amplifier, and simultaneously simplifies the realization method so as to achieve the final purpose of saving power consumption of the power amplifier. The hybrid average power tracking method is preferably applied in LTE and WCDMA user equipment.
Referring to fig. 3, the hybrid average power tracking method is actually a control method for continuous average power tracking and discrete offset, and one embodiment of the method includes the following steps.
Step 31: average power tracking is used for the supply voltage of the power amplifier, i.e. a different supply voltage value is used for each transmit power value of the power amplifier. The correspondence between the transmit power value and the supply voltage value is, for example, obtained during a transmit power calibration phase of the user equipment.
Step 32: discrete control is used for the bias voltage (or bias current) of the power amplifier, i.e. the bias voltage (or bias current) value of the same power amplifier is used for several adjacent transmit power values of the power amplifier, the number of all transmit power values of the power amplifier being greater than the number of all bias voltage (or bias current) values of the power amplifier. For example, the power amplifier has E kinds for the transmission power and F kinds for the bias voltage (or bias current), and E > F. The correspondence between the transmission power value and the bias voltage (or bias current) value is obtained, for example, as follows: the adjacent transmitting power values of the power amplifier are divided into a group, the transmitting power values in one group are close, all transmitting power values in one group are divided into a plurality of groups, the transmitting power values in one group correspond to the same one bias voltage (or bias current) value, and the transmitting power values in different groups correspond to different bias voltage (or bias current) values.
The sequence of steps 31, 32 is either interchanged or performed simultaneously.
Referring to table 3, a look-up table of continuous average power tracking and discrete bias control is shown, which describes the supply voltage VCC (n) of the power amplifier for each transmit power P (n) of the power amplifier. The transmission power values of indexes 1 to n are set one, which collectively correspond to the same one Bias voltage (or Bias current) Bias (1). The transmission power values of the indices m to m+k are set m, which collectively correspond to the same one Bias voltage (or Bias current) Bias (m). The transmission power values of the indexes N to n+p are set N, which collectively correspond to the same one Bias voltage (or Bias current) Bias (N).
Table 3: lookup tables for continuous average power tracking and discrete bias control
In the hybrid average power tracking method, the transmitting power value and the power supply voltage value corresponding to each bias voltage (or bias current) value are actually measured, and all radio frequency indexes specified by a protocol need to be met. One bias voltage (or bias current) value corresponds to a plurality of different transmit power values, each corresponding to a different supply voltage value.
The supply voltage value of the power amplifier is typically defined between a minimum value VCC (min) and a maximum value VCC (max). After the transmit power of the power amplifier is below a certain value, the supply voltage is kept at a minimum value VCC (min). When the transmission power of the power amplifier is larger than a certain value, the power amplifier can be operated in a linear section under high power so as not to bring the power amplifier into a saturated state as much as possible, and the power supply voltage is kept at a maximum value VCC (max).
Referring to fig. 4, the present application further provides an apparatus for reducing power consumption of a power amplifier, and one embodiment of the apparatus includes a power amplifier 41, a power supply unit 42, and a bias unit 43.
The power supply unit 42 supplies power to the power amplifier 41 in an average power tracking manner, that is, a different power supply voltage value is used for each transmission power value of the power amplifier 41. The correspondence between the transmit power value and the supply voltage value is, for example, obtained during a transmit power calibration phase of the user equipment.
The bias unit 43 provides bias voltages (or bias currents) for the power amplifier 41 in a discrete control manner, that is, the same bias voltage (or bias current) value is used for several adjacent transmit power values of the power amplifier 41, and the number of all transmit power values of the power amplifier is greater than the number of all bias voltage (or bias current) values of the power amplifier. The correspondence between the transmission power value and the bias voltage (or bias current) value is obtained, for example, as follows: the adjacent transmitting power values of the power amplifier are divided into a group, the transmitting power values in one group are close, all transmitting power values in one group are divided into a plurality of groups, the transmitting power values in one group correspond to the same one bias voltage (or bias current) value, and the transmitting power values in different groups correspond to different bias voltage (or bias current) values.
Preferably, the supply voltage value provided by the supply unit 42 is defined between a minimum value VCC (min) and a maximum value VCC (max). After the transmit power of the power amplifier is below a certain value, the supply voltage is kept at a minimum value VCC (min). When the transmission power of the power amplifier is larger than a certain value, the power amplifier can be operated in a linear section under high power so as not to bring the power amplifier into a saturated state as much as possible, and the power supply voltage is kept at a maximum value VCC (max).
In summary, the method and the device for reducing the power consumption of the power amplifier provided by the application not only give consideration to the low power consumption requirement of the power amplifier, but also reduce the control difficulty, are easy to meet the radio frequency performance index, and reduce the testing workload.
The foregoing is merely a preferred embodiment of the present application and is not intended to limit the present application. Various modifications and changes may be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.
Claims (8)
1. A method for reducing power consumption of a power amplifier, comprising the steps of:
step 31: the power supply voltage of the power amplifier is tracked by adopting average power, namely, the power supply voltage of the power amplifier is dynamically adjusted according to different transmitting power of the power amplifier, and each transmitting power value of the power amplifier adopts different power supply voltage values;
step 32: the bias voltage or bias current of the power amplifier is controlled in a discrete mode, namely different bias voltages or bias currents are used according to different groups of transmitting power of the power amplifier, a plurality of adjacent transmitting power values of the power amplifier are divided into a group of bias voltages or bias current values of the same power amplifier, and the number of all transmitting power values of the power amplifier is larger than that of all bias voltages or bias current values of the power amplifier;
the power supply voltage of the power amplifier corresponding to each transmitting power and the same bias voltage or bias current corresponding to each group of transmitting power of the power amplifier are recorded in a lookup table;
the sequence of steps 31, 32 is either interchanged or performed simultaneously.
2. The method according to claim 1, wherein in the step 31, the correspondence between the transmission power value and the supply voltage value is obtained in a transmission power calibration phase of the ue.
3. The method of reducing power consumption of a power amplifier according to claim 1, wherein in step 31, the supply voltage value of the power amplifier is defined between a minimum value and a maximum value.
4. The method for reducing power consumption of a power amplifier according to claim 1, wherein in the step 32, the correspondence between the transmission power value and the bias voltage or bias current value is obtained by: the adjacent transmitting power values of the power amplifier are divided into a plurality of groups, all the transmitting power values in one group are jointly corresponding to the same bias voltage or bias current value, and the transmitting power values of different groups are corresponding to different bias voltage or bias current values.
5. The device for reducing the power consumption of the power amplifier is characterized by comprising the power amplifier, a power supply unit and a biasing unit;
the power supply unit supplies power to the power amplifier in an average power tracking mode, namely, dynamically adjusting the power supply voltage of the power amplifier according to different transmitting power of the power amplifier, and adopting different power supply voltage values for each transmitting power value of the power amplifier;
the bias unit adopts a discrete control mode to provide bias voltage or bias current for the power amplifier, namely different bias voltage or bias current is used according to different groups of transmitting power of the power amplifier, a plurality of adjacent transmitting power values of the power amplifier are divided into a group and the same one bias voltage or bias current value is adopted, and the number of all transmitting power values of the power amplifier is larger than that of all the bias voltage or bias current values of the power amplifier;
the supply voltage of the power amplifier, which is different from each other, and the bias voltage or bias current, which is the same from each group of power amplifiers, are recorded in a lookup table.
6. The apparatus for reducing power consumption of a power amplifier according to claim 5, wherein the correspondence between the transmission power value and the supply voltage value employed by the power supply unit is obtained during a transmission power calibration phase of the user equipment.
7. The apparatus for reducing power consumption of a power amplifier according to claim 5, wherein the power supply unit provides a supply voltage value defined between a minimum value and a maximum value.
8. The apparatus for reducing power consumption of a power amplifier according to claim 5, wherein the correspondence between the transmission power value employed by the bias unit and the bias voltage or bias current value is obtained by: the adjacent transmitting power values of the power amplifier are divided into a plurality of groups, all the transmitting power values in one group are jointly corresponding to the same bias voltage or bias current value, and the transmitting power values of different groups are corresponding to different bias voltage or bias current values.
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| 异相与超宽带射频功率放大器的设计;朱雄辉;《中国优秀硕士学位论文全文数据库信息科技辑》(第3（2019年）期);I135-109 * |
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