CN118264213A - Power amplifier with slowly-varying power regulation function - Google Patents
Power amplifier with slowly-varying power regulation function Download PDFInfo
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- CN118264213A CN118264213A CN202311817407.9A CN202311817407A CN118264213A CN 118264213 A CN118264213 A CN 118264213A CN 202311817407 A CN202311817407 A CN 202311817407A CN 118264213 A CN118264213 A CN 118264213A
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Abstract
The invention discloses a power amplifier with a gradual change power regulation function, which comprises a PA core amplifying circuit and a power supply module with an output voltage adjustable function, wherein the gradual change power regulation method comprises the following steps: the PA core amplifying circuit is fixed, and the power is adjusted by adjusting the power supply module. The invention has the advantages that the PA core is fixed and unchanged, and the power is adjusted by adjusting the power supply of the PA core.
Description
Technical Field
The invention relates to the technical field of semiconductor integrated circuits, in particular to a power amplifier with a slowly-varying power regulation function.
Background
The Power Amplifier (PA) is widely applied to a wireless transmitter, and is required to push out larger output power as the final stage of an emitter, and often relates to an application scene of a switching power amplifier so as to meet the application scene of a system. Because the power amplifier consumes larger current and has larger output power, larger overshoot voltage and current generally exist in the output of the power amplifier during rapid switching, and the power amplifier and the later-stage module can be burnt. Furthermore, for systems applied to amplitude modulation, such as application scenarios where ASK modulation is implemented by a switching PA, fast switching may lead to spectral broadening and momentary abrupt changes in signal energy may deteriorate the quality of the signal. A PA with a gradual power regulation is then necessary.
The basic principle of operation of a known PA is to draw energy from a power supply to convert it into output power. The general scheme for implementing power regulation is shown in fig. 2 below, where the supply voltage of the PA core is kept unchanged, and the output power is changed by adjusting the current of the PA core (for example, the PA core is connected in parallel by a multi-stage array, and the partial sub-array cells are turned off to implement the regulation function), so that when the scheme is applied, a larger signal still exists on the turned-off sub-cell devices due to the larger signal amplitude of the PA output, which may cause overvoltage damage of the sub-cell devices, thereby affecting the service life.
Disclosure of Invention
In order to solve the technical problems, the invention provides a power amplifier with a gradual change power regulation function, which is divided into two parts, namely a PA core amplifying circuit (PA core) and a power supply module. Different from a general power regulation scheme, the invention realizes the gradual increase and the gradual decrease of the output power of the PA in the opening and closing processes by gradually regulating the power supply voltage of the PA core.
The technical scheme adopted is as follows:
the utility model provides a power amplifier with slowly change power regulation function, power amplifier includes PA core amplification circuit and has the adjustable function of output voltage's power supply module, slowly change power regulation's method does: the PA core amplifying circuit is fixed, and the power is adjusted by adjusting the power supply module.
The power amplifier with the slowly-varying power adjusting function is fixed, the PA core is unchanged, and the power supply of the PA core is adjusted so as to realize power adjustment.
Further preferably, the PA core amplifying circuit gradually increases the power supply from turn-off to turn-on to realize slow power increase; the method comprises the following steps:
Setting the total time for the power of the PA core amplifying circuit to slowly rise (namely, the power is changed from 0 to the maximum power) as Will take the total timeIs divided into n steps, each step being of the timeThenOutput voltage generated by power supply moduleThe average power output by the PA core amplifying circuit is respectively。
Further preferred embodiments of the present invention provide a total time ofThe step number n is selected so that the power variation ratio of the power amplifierMeet the design requirement and the power change ratioThe formula is as follows:
Wherein, For the PA on-time period,Is the PA maximum output power.
Further preferred is the technical proposal of the invention, the regulationAnd the step number n can adjust the rising rate of the power rampRate of rise of power rampThe following are provided:
Wherein, The total time for the PA core amplifying circuit power to rise slowly, i.e., the total time for the power to change from 0 to maximum power.
Further preferably, the method is also used for switching the PA core amplifying circuit from on to off and reducing the power ramp rateThe following are provided:
Wherein, The total time for the PA core amplifying circuit power to slowly drop, i.e., the total time for the power to change from maximum power to 0.
Compared with the prior art, the invention has the beneficial effects that:
the invention has the advantages of 1: the degree of freedom in the adjustment of the ramp rate is greater. As in the case of the present invention, And n can be implemented by a digital scheme, with relatively smaller area and higher degrees of freedom when implemented on-chip.
The invention has the advantages of 2: the implementation of the regulation function is put on the power supply regulation, which is more beneficial to the improvement of the performance of the PA core main circuit. Particularly in the application scene of higher signal frequency, the performance of the PA core is more sensitive to the parasitic effect of the switch, and no extra switching device is introduced in the PA core, so that the optimal performance of the main circuit is realized.
The invention has the advantages of 3: the damage to the device caused by adjusting the power in a larger power interval range is effectively improved, and the long-term service life is prolonged. As in the power amplifier designed on an IC chip by adopting a MOSFET, the power is regulated between Pmax-delta and Pmax, wherein Pmax is the maximum output power of the power amplifier, delta P is the relative Pmax to the power regulation quantity, and delta P < < Pmax. If general power adjustment is adopted, the sub-cell output port turned off by the PA core still has larger signal swing, particularly a sub-nm low-voltage domain process, so that the device cannot be damaged due to the swing of the amplitude in a short term, but the device performance is degraded and even the device is damaged due to long-term use, so that the function is affected. The problem is not existed in the invention, and in the invention, in the power setting lower than Pmax, the voltage seen by the output end of the PA core device is less than or equal to Vspu _PA corresponding to the maximum power.
Drawings
FIG. 1 is a schematic diagram of a power amplifier module structure according to the present invention;
FIG. 2 is a schematic diagram of a prior art power amplifier module;
FIG. 3 is a schematic diagram of power regulation of the power amplifier of the present invention;
Fig. 4 is a schematic diagram of a module structure of a power amplifier in embodiment 1;
FIG. 5 is a schematic diagram of the power regulation of example 1;
Fig. 6 is a schematic diagram of a module structure of a power amplifier in embodiment 2;
Fig. 7 is a schematic diagram of power adjustment of case 4 of embodiment 2.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail with reference to the accompanying drawings, fig. 1 to 7 and examples. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention. In addition, the technical features of the embodiments of the present invention described below may be combined with each other as long as they do not collide with each other.
As shown in fig. 1, the present embodiment is a power amplifier with a gradual power adjustment function, including a PA core amplifying circuit (PA core) and a power supply module, where the PA core amplifying circuit is fixed, and the power is adjusted by adjusting a power supply of the PA core amplifying circuit, and the specific method is as follows: the power supply is gradually increased from turn-off to turn-on of the PA core amplifying circuit so as to realize slow power increase; that is, when the PA core amplifying circuit is switched off to on, the output voltage of the power supply module is switched onGradually increasing, thereby realizing slow power increase; likewise, by taking the output voltage of the power supply module fromGradually decreasing, thereby achieving a slow power reduction.
The basic principle of the invention is shown in figure 1. Unlike a general power regulation scheme, the power regulation is realized by regulating the power supply of the PA core, wherein the PA core is fixed.
The power adjustment scheme of the present invention is shown in fig. 3. By adjusting the power supply of the PA core, the power can be slowly increased and decreased, and the changing rate can be adjusted. The PA gradually increases the power supply from off to on to achieve a slow increase in power, wherein the total time from off to on is track_up, the total number of steps is n, the time per step is tstep_i (i=1, 2, …, n), then track_up=tstep_1+tstep_2+ … +tstep_n, and the slow rising rate can be adjusted by adjusting tstep_i and the number of steps n.
Similar schemes may be employed to achieve a slow power reduction when the same PA is switched from on to off.
Examples of specific applications
Such as in a wireless transmitter system employing ASK or OOK modulation, the modulation application is achieved by adjusting the PA power. Taking OOK application as an example, the PA is turned on or off at the baseband rate required by the system to implement OOK modulation. Taking the invention as an example, a switch control signal related to the baseband speed can be used, the control signal has the function of gradual change regulation, and a power supply module with the function of adjustable output voltage, such as an LDO (low dropout linear regulator), is designed in a matching way, so that the output voltage of the power supply module can be adjusted to meet the application of the invention.
Example 1
The method is applied to a wireless transmitter system for realizing ASK or OOK modulation by adjusting PA power. The application is shown in the following figures 4 and 5, and consists of a digital control logic circuit, a power supply module with an output voltage adjustable function and a PA core main body amplifying circuit. Wherein the signal PA_EN is a control signal generated under the condition of meeting the modulation rate requirement of the system, and the control signal is generated by a digital logic circuit,Controlling a power supply module with an adjustable function to generate corresponding output voltageThe corresponding average power of the PA core outputs are respectivelyThe corresponding time is respectively. Whether this function is used or not introduces a power change ratio of:
The rate of slow power rise or fall is:
Wherein the method comprises the steps of For the PA on-time period,Is the PA maximum output power.
Such as setting=0, =0, ThenNamely the PA without a gradual change adjusting function;
Such as setting =3，，ThenNamely, the total power of the PA is reduced by 10% after the slow-change adjusting function is used;
In certain cases, n and The rate of ramp can be adjusted and the power change introduced by this function.
Example 2
In the inventionAndThere may be a combination of the following:
case 1: ；
case 2: ；
case 3:
Case 4:
The implementation can be realized by changing the digital logic circuit function in fig. 4 to have the corresponding logic function. As for case 4 The application of (a) is shown in figures 6 and 7.
Example 3
The present embodiment is also applicable to a system that does not need to have a power adjustment function, but needs to have an on-off function. The basic implementation principle is the same as that of embodiment 1. Only 1 step is provided=1，The overshoot effect possibly introduced in the rapid switching process of the high-power module PA can be reduced under the condition of extremely low power loss.
It will be readily appreciated by those skilled in the art that the foregoing description is merely a preferred embodiment of the invention and is not intended to limit the invention, but any modifications, equivalents, improvements or alternatives falling within the spirit and principles of the invention are intended to be included within the scope of the invention.
Claims (5)
1. The power amplifier with the function of slowly varying power regulation is characterized by comprising a PA core amplifying circuit and a power supply module with the function of adjustable output voltage, wherein the method for slowly varying power regulation comprises the following steps: the PA core amplifying circuit is fixed, and the power is adjusted by adjusting the power supply module.
2. The power amplifier with a gradual power regulation function according to claim 1, wherein the PA core amplifying circuit gradually increases the power supply from off to on to achieve a gradual increase in power; the method comprises the following steps:
setting the total time of the slow power rise of the PA core amplifying circuit as Will take the total timeIs divided into n steps, each step being of the timeThenOutput voltage generated by power supply moduleThe average power output by the PA core amplifying circuit is respectively。
3. The power amplifier with a slow varying power regulating function as claimed in claim 2, wherein the total time isThe step number n is selected so that the power variation ratio of the power amplifierMeet the design requirement and the power change ratioThe formula is as follows:
，
Wherein, For the PA on-time period,Is the PA maximum output power.
4. A power amplifier with a gradual power regulation function according to claim 3, wherein the regulation isAnd the step number n can adjust the rising rate of the power rampRate of rise of power rampThe following are provided:
，
Wherein, The total time for the PA core amplifying circuit power to slowly rise.
5. The power amplifier with a gradual power regulation function as claimed in claim 4, wherein the method is also used for switching the PA core amplifying circuit from on to off, the power gradual falling rateThe following are provided:
，
Wherein, The total time for the PA core amplifying circuit to slowly power down.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311817407.9A CN118264213A (en) | 2023-12-27 | 2023-12-27 | Power amplifier with slowly-varying power regulation function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311817407.9A CN118264213A (en) | 2023-12-27 | 2023-12-27 | Power amplifier with slowly-varying power regulation function |
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| Publication Number | Publication Date |
|---|---|
| CN118264213A true CN118264213A (en) | 2024-06-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311817407.9A Pending CN118264213A (en) | 2023-12-27 | 2023-12-27 | Power amplifier with slowly-varying power regulation function |
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| CN (1) | CN118264213A (en) |
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- 2023-12-27 CN CN202311817407.9A patent/CN118264213A/en active Pending
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