CN210111952U - Power supply for radio frequency power amplifier - Google Patents
Power supply for radio frequency power amplifier Download PDFInfo
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- CN210111952U CN210111952U CN201920779740.8U CN201920779740U CN210111952U CN 210111952 U CN210111952 U CN 210111952U CN 201920779740 U CN201920779740 U CN 201920779740U CN 210111952 U CN210111952 U CN 210111952U
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Abstract
A power supply for a radio frequency power amplifier, comprising: first and second linear circuits for: respectively carrying out linear amplification on a low-power signal and a high-power signal in the first envelope signal, and respectively providing a first voltage and a second voltage for a radio frequency power amplifier; the low-power signal is a signal with the power proportion of less than or equal to 30% in the envelope signal, and the high-power signal except the low-power signal is a signal with the power proportion of more than or equal to 70% in the envelope signal; a third circuit to: the linearly amplified high power signal is sensed and operated in a constant on-time control mode with a constant on-time or a constant off-time control mode with a constant off-time to provide a third current to the rf power amplifier according to the sensed linearly amplified high power signal. The present disclosure enables linear processing for low power signals and high power signals, respectively, in combination with COT control, thereby improving the efficiency of the power supply.
Description
Technical Field
The present disclosure relates to the field of mobile communications, and more particularly, to a power supply for a radio frequency power amplifier.
Background
In the field of mobile communication, in order to improve the efficiency of the rf power amplifier, a hybrid power supply of a linear amplification unit combined with a switching power supply, which mostly adopts a hysteresis control (hystersis control) technique, may be used. Although the technology can effectively combine the linear amplification and the switching power supply technology to enable the system to achieve stable operation, the switching frequency of the switch in the technology is influenced by the bandwidth of an envelope signal: as the envelope signal bandwidth increases, the switching frequency becomes faster, which presents a challenge to the switching control. In addition, the turn-on time point of the technology has strong sensitivity to output noise, the turn-on time often lags behind the optimal switch time point, and when the technology processes a wide-bandwidth and high-PAPR envelope signal, the output power loss of the switch power supply and the linear amplification related circuit is increased at the same time, thereby causing the efficiency of the whole power supply system to be reduced along with the increase of the bandwidth.
Under the current situation of increasing bandwidth, how to further improve the power efficiency of the rf power amplifier is always a technical problem to be considered in the field.
SUMMERY OF THE UTILITY MODEL
To solve the above technical problem, the present disclosure provides a power supply for a radio frequency power amplifier, including:
a first linear circuit to: performing linear amplification on a low-power signal in the first envelope signal, and providing a first voltage for a radio frequency power amplifier according to the linearly amplified low-power signal; wherein, the low-power signal is a signal with a power ratio of less than or equal to 30% in the envelope signal;
a second linear circuit to: performing linear amplification on high-power signals except the low-power signal in the first envelope signal, and providing a second voltage for the radio-frequency power amplifier according to the linearly amplified high-power signals; wherein the high-power signal except the low-power signal is a signal with power of 70% or more in the envelope signal;
a third circuit to: the linearly amplified high power signal is sensed and operated in a constant on-time control mode with a constant on-time or a constant off-time control mode with a constant off-time to provide a third current to the rf power amplifier according to the sensed linearly amplified high power signal.
Preferably, the first and second liquid crystal materials are,
the first envelope signal is an envelope signal input to the radio frequency power amplifier.
Preferably, the first and second liquid crystal materials are,
obtaining the low power signal and/or the high power signal other than the low power signal in the first envelope signal by any one or any combination of the following: filters, RF detectors, RMS detectors.
Preferably, the first and second liquid crystal materials are,
the power supply further comprises a first mode selection unit for selecting between the constant on-time control mode and the constant off-time control mode.
Preferably, the first and second liquid crystal materials are,
the third circuit comprises a third control unit, a third driving unit and a third inductor;
the third control unit comprises an input end for receiving the sensed linearly amplified high-power signal;
the third control unit further comprises an output terminal for outputting a third control signal to cause the power supply to operate in any one of the following modes: a constant on time control mode with a constant on time, a constant off time control mode with a constant off time;
the third driving unit is used for being connected with the output end of the third control unit and providing a third electric signal to the third inductor based on the third control signal;
and the third inductor is used for providing a third current for the radio frequency power amplifier under the action of a third electric signal.
Preferably, the first and second liquid crystal materials are,
the third driving unit includes: a third switching amplifier, or comprising: an upper power tube and a lower power tube.
Preferably, the first and second liquid crystal materials are,
the third circuit comprises a timing unit for determining the constant on-time or constant off-time.
Preferably, the first and second liquid crystal materials are,
the third circuit includes a comparator to:
(1) when the preset current value I in the third circuitDThe ripple value I of the output current of the second linear circuit is less than or equal toSLWhen the first current is greater than the second current, the first circuit is enabled to operate and provide a first current;
(2) when the preset current value I in the third circuitDGreater than or equal to or greater than the ripple value I of the output current of the second linear circuitSLWhen the third current is not supplied, the third circuit is enabled to supply the third current.
Preferably, the first and second liquid crystal materials are,
the second linear circuit includes a plurality of parallel branches, and:
each branch circuit respectively linearly amplifies a part of signals in the high-power signals and provides corresponding branch circuit voltage according to the linearly amplified part of high-power signals;
and after the voltage superposition of each branch circuit, a second voltage is provided for the radio frequency power amplifier.
Preferably, the first and second liquid crystal materials are,
the first linear circuit includes a first inductor, and the first linear circuit provides a first voltage to the radio frequency power amplifier through mutual inductance between the first inductor and a third inductor in a third circuit.
Through the technical scheme, compared with the traditional hysteresis control, the power supply for the radio frequency power amplifier is novel, and can provide electric energy for the radio frequency power amplifier adaptively according to different power proportions in the envelope signal so as to improve the overall efficiency of the power supply.
Drawings
FIGS. 1-3 are schematic diagrams of power supply configurations shown in various embodiments of the present disclosure;
FIG. 4 is a schematic diagram of a third circuit shown in one embodiment of the present disclosure;
FIGS. 5-6 are schematic diagrams of the structure of the power supply shown in various embodiments of the present disclosure;
fig. 7A (1) is a simulation diagram of a conventional hysteretic control power supply for a 100MHz signal of a first envelope signal when luH smaller inductors are adopted, and fig. 7B (1) is a waveform of a driving unit switch corresponding to a switching power supply portion of the conventional hysteretic control power supply;
fig. 7A (2) is a simulation of the power supply in one embodiment of the present disclosure for the same first envelope signal as a 100MHz signal when luH smaller inductors are used, and fig. 7B (2) is a waveform of the third driving unit switch corresponding to the switching power supply portion of the power supply;
fig. 7C (1) is a simulation diagram of the conventional hysteretic control power supply for a first envelope signal of 100MHz when a large inductance of 50uH is adopted, and fig. 7D (1) is a waveform of a driving unit switch corresponding to a switching power supply portion of the conventional hysteretic control power supply;
fig. 7C (2) is a simulation diagram of the power supply in one embodiment of the present disclosure for a same first envelope signal being a 100MHz signal when a larger inductance of 50uH is used, and fig. 7D (2) is a waveform of a third driving unit switch corresponding to a switching power supply portion of the power supply.
Detailed Description
In the following description, numerous details are set forth to provide a more thorough explanation of embodiments of the present disclosure. It will be apparent, however, to one skilled in the art that the embodiments of the present disclosure may be practiced without these specific details. In other instances, well-known structures and devices are shown in block diagram form, rather than in detail, in order to avoid obscuring embodiments of the present disclosure. Furthermore, features of different embodiments described below may be combined with each other, unless specifically stated otherwise.
The terms "first," "second," and the like as used in this disclosure are used for distinguishing between different objects and not for describing a particular order. Furthermore, "include" and "have," as well as any variations thereof, are intended to cover and not to exclude inclusions. For example, a process, method, system, or article or apparatus that comprises a list of steps or elements is not limited to only those steps or elements but may alternatively include other steps or elements not expressly listed or inherent to such process, method, system, article, or apparatus.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the disclosure, and the embodiment described is a portion of but not all embodiments of the disclosure. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It will be appreciated by those skilled in the art that the embodiments described herein may be combined with other embodiments.
Referring to fig. 1, in one embodiment, the present disclosure proposes a power supply for a radio frequency Power Amplifier (PA), comprising:
a first linear circuit to: linearly amplifying the low power signal S2 in the first envelope signal S1, and providing a first voltage V to a radio frequency Power Amplifier (PA) according to the linearly amplified low power signalc1(ii) a Wherein, the low-power signal is a signal with a power ratio of less than or equal to 30% in the envelope signal;
a second linear circuit to: linearly amplifying the high power signal S3 except the low power signal S2 in the first envelope signal S1, and providing a second voltage V to a radio frequency Power Amplifier (PA) according to the linearly amplified high power signalc2(ii) a Wherein the high-power signal S3 except the low-power signal is a signal with 70% or more of power in the envelope signal;
a third circuit to: sensing the linearly amplified high power signal and operating in a constant on-time control mode with a constant on-time or a constant off-time control mode with a constant off-time, in order to determine the power level of the high power signal based on the sensed power levelThe linearly amplified high power signal provides a third current I to a radio frequency Power Amplifier (PA)SW。
For the above embodiment:
in one aspect, first and second linear circuits linearly amplify low and high power signals, respectively, and provide a first voltage V to a radio frequency Power Amplifier (PA)c1And a second voltage Vc2；
On the other hand, according to the characteristic that the high-power signal belongs to the envelope signal and has high power ratio, the third circuit provides a third current I to the radio frequency Power Amplifier (PA) by utilizing a COT control mode (a constant on-time control mode or a constant off-time control mode)SW；
This allows the above embodiment to function as follows:
firstly, the envelope signals with high power and low power are classified and processed through two linear circuits, and a traditional signal modulation processing unit does not need to be designed for the envelope signals with high power and low power, so that the complexity of a power supply is reduced;
secondly, the envelope signals with high power and low power are classified and processed through the two linear circuits, so that the peak-to-average ratio (PAPR) of the whole envelope signals is improved, the PAPR of input signals in the two linear circuits is reduced, the swing of output voltages of the first linear circuit and the second linear circuit is reduced, correspondingly, the power loss of the first linear circuit and the second linear circuit is reduced, and the power efficiency is improved;
third, the first and second linear circuits provide a first voltage V to a radio frequency Power Amplifier (PA)c1And a second voltage Vc2Meaning that in the above embodiments, the first and second linear circuits can act as voltage sources, and then, in the case that the first and second linear circuits are not involved in supplying current, this not only reduces the power loss of the first and second linear circuits and improves the efficiency of the power supply, but also improves the capability of the power supply to handle bandwidth under the same condition;
fourthly, besides the characteristics brought by the first and second linear circuits, the third circuit provides a third current to the radio frequency power amplifier under the dual actions of the high power signal and COT control (constant on-time control mode or constant off-time control mode): on one hand, the on-off of the third circuit is separated from the influence of the envelope signal bandwidth, which is beneficial to the switching frequency of the power supply, thereby reducing the power loss in the switching process, reducing the influence of noise on the system, enhancing the stability of the system, keeping the characteristic of frequency jitter and EMI resistance in the traditional hysteresis control loop, and limiting the range of the frequency jitter, so that the efficiency of the power supply is improved on the premise of not influencing the linearity of the system; on the other hand, since the high-power signal accounts for more than 70% of the power proportion of the whole envelope signal, the third current is closer to the average value of the currents, so that the power output by the power supply is closer to the RMS (root mean square) signal in the envelope signal, and a novel envelope tracking power supply with significance can be realized in engineering.
That is to say, compared with the prior art, the power supply in the above embodiment not only processes the low power signal and the high power signal respectively, but also makes full use of the advantages of linear amplification and COT control, so that on one hand, the efficiency and stability of the power supply are improved, and on the other hand, the overall efficiency of the power supply is not affected by the bandwidth expansion.
It will be appreciated that, preferably, a high power signal will have a power in the envelope signal of more than 80-90%, which will better balance the frequency of the power switch with the efficiency of the power supply. Accordingly, this means that the percentage of low power signals is 10-20%.
This is common knowledge in the field of circuits, as regards the matching of the time constants or delays of the individual circuits themselves. The disclosure does not focus on how to design and adjust the time constant, and therefore, the detailed description thereof is omitted. It is to be understood that the power supply of the above embodiments may be an analog power supply, or may be a digital power supply, as long as the power supply can be implemented as an analog circuit or a digital circuit.
In addition, the above embodiment prefers the constant on-time mode when the rf power amplifier is judged to be lightly loaded or unloaded. This is because the constant on-time mode is more advantageous to reduce the switching loss and improve the power supply efficiency at light load or no load than the increase in the switching loss and the reduction in the power supply efficiency at light load caused by the constant off-time mode.
Referring to fig. 2, in another embodiment,
the third circuit comprises a third control unit 31, a third drive unit 32, a third inductance L33;
the third control unit 31 comprises an input for receiving the sensed linearly amplified high power signal;
the third control unit 31 further comprises an output for outputting a third control signal to cause the power supply to operate in any one of the following modes: a constant on time control mode with a constant on time, a constant off time control mode with a constant off time;
a third driving unit 32, configured to be connected to an output terminal of the third control unit and provide a third electrical signal to a third inductor L33 based on the third control signal;
a third inductor for providing a third current I to the RF power amplifier under the action of a third electric signalSW。
For the above embodiments, the third control unit 31 may be any COT control unit capable of implementing COT control. As for COT, two kinds are included: constant On Time, i.e., Constant On Time; and a Constant Off Time, i.e., Constant Off Time. It should be noted that the present disclosure does not focus on the innovative implementation of the COT control unit, and therefore, various COT control units in the prior art can be referred to, including a timer or a timer that may be involved in COT control, or other circuits or functional units cooperating with the timer or the timer, and the purpose of the present disclosure is mainly to calculate and determine a corresponding constant on-time or constant off-time.
It can be understood that, obviously different from the power supply implementing the hysteresis control after filtering in the prior art, the third circuit does not need to adopt the filtering unit and the hysteresis control, but quickly responds and adjusts the on-time or the off-time of the third driving unit through the third control unit, thereby improving the efficiency. That is to say, compared with the prior art that filtering and post-filtering hysteresis control are adopted, the above embodiment adopts COT control, so that the frequency of the third driving unit is not limited by equivalent load, hysteresis, loop delay, input signals and the like, and the method has the advantages of simple scheme, high efficiency, capability of eliminating control signal jitter, and capability of reducing noise; moreover, the COT control response speed is high, and the method is very suitable for application scenes such as envelope tracking which require large input signal bandwidth and are convenient to expand.
More particularly, it is to be noted that: when the power supply operates in the constant on-time mode or the constant off-time mode by controlling the third driving unit 32, this means that the third driving unit 32 enables the power supply to have the characteristics of the switching power supply, and since the power supply includes the first and second linear circuits, the power supply is a hybrid envelope tracking power supply combining the characteristics of the linear amplification characteristic and the switching power supply characteristic. However, with the rapid development of wireless communication technology, the 5G commercial era is about to start, and the 6G technology has also entered into the research stage, and in the face of the rapid increase of various service data such as the mobile internet, the internet of things and so on, the power peak-to-average power ratio (PAPR) of the radio frequency input signal is getting larger and larger, which results in that the linear amplification technology of constant voltage power supply has low efficiency under the situation of larger PAPR.
The above embodiments obviously help to solve the problem that the linear amplification technology has low efficiency under the condition of large peak-to-average ratio PAPR, which results in reduced efficiency of the whole power supply, because the above embodiments further control the third driving unit to make the power supply operate in the constant on-time mode or the constant off-time mode based on the sensed high-power signal in addition to the first and second linear circuits, which helps to increase the duty ratio of the switching power supply in the whole power supply and reduce the power consumption duty ratio of the linear circuits according to the high-power signal with higher duty ratio, thereby fully exerting the advantage of high efficiency of the switching power supply. As such, the above-described embodiments contribute to further improving the efficiency of the overall power supply.
In another embodiment, the first envelope signal is an envelope signal input to the radio frequency power amplifier.
For the embodiment, when the first envelope signal is the envelope signal input to the radio frequency power amplifier, as in most of the prior art solutions, the embodiment uses the radio frequency (i.e. RF) input signal as the reference signal for envelope tracking, and the embodiment also uses the envelope signal input to the radio frequency power amplifier from the signal source to realize envelope tracking. However, this is not meant to exclude other first envelope signals from the present disclosure, and it will be apparent that the relevant embodiments are not limited to the source of the envelope signals in accordance with the principles disclosed in the present disclosure in order to achieve the technical effects of the various embodiments described above.
In another embodiment, the power supply further comprises a first mode selection unit for selecting between the constant on-time control mode and the constant off-time control mode.
For this embodiment, an implementation of the mode selection is given, i.e. the selection is made by the first mode selection unit. It is understood that the selection may be implemented by hardware circuitry, or by software calculations. In addition, whether by hardware circuit or software calculation, as described above, when the rf power amplifier is determined to be under light load or idle load, the constant on-time control mode may be further preferred.
As previously mentioned, in another embodiment, the third circuit comprises a timing unit for determining the constant on-time or constant off-time.
It should be noted that, as to how to determine the constant on-time or the constant off-time, all corresponding means in the prior art can be adopted, and this disclosure is not repeated herein. It is also possible that the timing unit is provided in the third control unit or as a separate unit of the third circuit.
In another embodiment of the present invention, the substrate is,
obtaining the low power signal and/or the high power signal other than the low power signal in the first envelope signal by any one or any combination of the following: filters, RF detectors, RMS detectors.
For this embodiment, the aim is to detect a low power signal and/or a high power signal in order to classify the two. It will be appreciated that for the first and second linear circuits, the low power signal and the high power signal may be detected by selecting different filters and/or RF detectors (also called RF power detectors, such as ADI, a corresponding product of Analog devices) and/or RMS detectors (also called RMS response power detectors) depending on the characteristics of the low power signal and the high power signal in terms of frequency and power, respectively. It should be noted that, in order to balance the frequency of the power switch and the efficiency of the power supply, the definitions of the low power signal and the high power signal may be adjusted by the filter, the RF detector and the RMS detector, i.e. the power ratio in the definitions may be increased or decreased.
In another embodiment, preferably, since the envelope signal includes the low power signal and the high power signal, only the low power signal/high power signal may be detected, and the remaining high power signal/low power signal may be obtained by performing a difference operation on the detected low power signal/high power signal by the envelope signal.
In another embodiment, as shown in fig. 3, if only a low frequency filtering unit (i.e. a low frequency filter of the filters) is employed in the second linear circuit, then:
on one hand, since the low frequency filtering unit can filter out the unwanted high frequency signal (note that it corresponds to the low power signal) in S1, the low frequency signal S3 (i.e. the high power signal S3) with higher power ratio is allowed to pass, and the linear amplification is completed in the second control unit and the second voltage is provided to the rf power amplifier;
on the other hand, since the first linear circuit and the second linear circuit are in a parallel relationship in fig. 3, the remaining signal except for the high power signal S3, i.e., the low power signal S2, enters the first linear circuit, it linearly amplifies the low power signal S2 by the first control unit and supplies the first voltage to the rf power amplifier in the case where the first linear circuit is not provided with a filter.
That is, with this embodiment, it is possible to achieve separate processing of high-power and low-power signals by the first and second linear circuits by merely providing a low-frequency filtering unit in the second linear circuit. It will be appreciated that when the first and second control units effect linear amplification, they may comprise linear amplifiers.
Referring to fig. 4, in another embodiment,
the third driving unit includes: a third switching amplifier, or comprising: an upper power tube and a lower power tube.
It can be understood that the switching amplifier is obviously used to implement a driving unit of a switching power supply;
for this embodiment, referring to fig. 4, taking the third driving unit including the upper power transistor M1 and the lower power transistor M2 as an example:
as shown in fig. 4, the third driving unit includes an upper power transistor M1 and a lower power transistor M2, wherein one end of M1 is connected to VDD power, one end of M2 is grounded, the common end of M1 and M2 is an output end, and the gates of M1 and M2 are respectively connected to the output end of the control unit, and are turned on or off based on the gate voltage provided by the third control unit.
In another embodiment of the present invention, the substrate is,
the third circuit includes a comparator to:
(1) when the preset current value I in the third circuitDThe ripple value I of the output current of the second linear circuit is less than or equal toSLWhen the third circuit is enabled and provides a third current ISW；
(2) When the preset current value I in the third circuitDGreater than or equal to or greater than the ripple value I of the output current of the second linear circuitSLWhen the third current is not supplied, the third circuit is enabled to supply the third current.
For this embodiment, although the second linear circuit can be regarded as a voltage source, in practical engineering applications, the ripple value of the output current is unavoidable, and in order to achieve a higher power efficiency, it utilizes the ripple value I of the output current of the second linear circuitSLTo control the operation of the third circuit. It will be appreciated that the comparator may be a separate unit in the third circuit or may be part of the third control unit in combination with the previously described embodiments. Further, the output current ripple value may be compared withThe third currents together provide current to the rf power amplifier as will be described in more detail below.
Referring to fig. 5, in another embodiment,
the first linear circuit includes a first inductor L12, and the first linear circuit provides the first voltage V to the RF power amplifier through the mutual inductance between the first inductor L12 and a third inductor L33 in the third circuit by using the third inductorc1。
Referring to fig. 6, in another embodiment,
the first linear circuit comprises a first capacitor C12, and a first voltage V is provided for the radio frequency power amplifier through a first capacitor C12c1。
In combination with the other embodiments, when the output current ripple value I of the second linear circuitSLThe ripple value I of the output current can be enabled when the third circuit is in operationSLCan be adjusted to the third current ISWTogether supplying a current I to a radio frequency power amplifierm。
In another embodiment of the present invention, the substrate is,
the second linear circuit includes a plurality of parallel branches, and:
each branch circuit respectively linearly amplifies a part of signals in the high-power signals and provides corresponding branch circuit voltage according to the linearly amplified part of high-power signals;
and after the voltage superposition of each branch circuit, a second voltage is provided for the radio frequency power amplifier.
It can be understood that, since the envelope signal includes signals with different frequencies and corresponding power ratios, the high-power signal is detected according to the frequency and/or power by using multiple branches connected in parallel, as before, the low-power signal and the high-power signal are detected separately, and this parallel scheme is to provide the second voltage to the rf power amplifier more efficiently. This, of course, increases the cost and complexity of the associated circuitry. One skilled in the art can trade off circuit complexity against power efficiency depending on the application.
In a similar manner, the first and second substrates are,
the first linear circuit may also include multiple parallel branches, and:
each branch circuit respectively linearly amplifies a part of signals in the low-power signals and provides corresponding branch circuit voltage according to the linearly amplified part of low-power signals;
the superposed voltages of the branches provide a first voltage to the radio frequency power amplifier.
Further, when the second linear circuit includes a plurality of parallel branches,
the third circuit may also sense a portion of the high-power signal linearly amplified by each branch of the second linear circuit through each branch of the third circuit corresponding to each branch of the second linear circuit one to one, and even further, according to a current value preset by each branch of the third circuit and a ripple value of an output current of each branch of the second linear circuit, each branch of the third circuit may operate in a COT mode, so as to superimpose currents output by each branch of the third circuit and provide the third current to the rf power amplifier.
Fig. 7A (1) to 7D (2) are graphs showing simulation effects of a conventional hysteretic control circuit and a COT control mode circuit adopted by the third control unit 31 of the present disclosure after modulating the same envelope signal and the same inductance, where modulation for a 100MHz signal is exemplarily shown, and the COT control module of the present disclosure has a lower switching frequency, a current closer to the envelope signal, and an optimal on-time point of the COT is optimized. As shown in fig. 7A (1), fig. 7B (1), fig. 7A (2), and fig. 7B (2), when both the conventional hysteretic control circuit and the COT control mode circuit of the present disclosure adopt luH small inductors, because the inductance is small, the output current ripple of the second control unit 22 is large, the system delay is small, and the speed of reflecting the envelope tracking becomes fast; for example, as shown in fig. 7C (1), fig. 7D (1), fig. 7C (2), and fig. 7D (2), when both the conventional hysteretic control circuit and the COT control mode circuit of the present disclosure adopt a large inductance of 50uH, because the inductance is relatively large, the current ripple of the second control unit 22 is reduced, the system delay is large, the reflection speed for envelope tracking is slow, but the current is closer to the average value, so the power output by the system is closer to the RMS signal in the envelope signal, the overall power consumption consumed by the linear circuit is reduced, the switching frequency of the COT control module is further reduced, and the system efficiency is improved.
Furthermore, in some embodiments, the control unit may be provided on a chip or processor (e.g., silicon) of the digital transmitter. Furthermore, the driving unit may also be provided on a chip or processor of the digital transmitter. More broadly, the remaining units may also be provided on the relevant chip or processor. The above power supply may naturally also be provided on the chip or processor of the digital transmitter.
Embodiments of the present disclosure may be implemented in hardware or in software, depending on the particular implementation requirements. The implementation may be performed using a digital storage medium (e.g., a floppy disk, DVD, blu-ray, CD, ROM, PROM, EPROM, EEPROM, or FLASH memory) having electronically readable control signals stored thereon. Accordingly, the digital storage medium may be computer-readable.
In some embodiments, a programmable logic device (e.g., a field programmable gate array) may be used to perform some or all of the functions of the methods described herein. In some embodiments, a field programmable gate array may cooperate with a microprocessor to implement the power supplies described herein.
The above-described embodiments are merely illustrative of the principles of the present disclosure. It is to be understood that modifications and variations of the arrangements and details described herein will be apparent to those skilled in the art. It is the intention, therefore, to be limited only as indicated by the scope of the claims appended hereto, and not by the specific details presented by way of the description and illustration of the embodiments presented herein.
Claims (10)
1. A power supply for a radio frequency power amplifier, comprising:
a first linear circuit to: performing linear amplification on a low-power signal in the first envelope signal, and providing a first voltage for a radio frequency power amplifier according to the linearly amplified low-power signal; wherein, the low-power signal is a signal with a power ratio of less than or equal to 30% in the envelope signal;
a second linear circuit to: performing linear amplification on high-power signals except the low-power signal in the first envelope signal, and providing a second voltage for the radio-frequency power amplifier according to the linearly amplified high-power signals; wherein the high-power signal except the low-power signal is a signal with power of 70% or more in the envelope signal;
a third circuit to: the linearly amplified high power signal is sensed and operated in a constant on-time control mode with a constant on-time or a constant off-time control mode with a constant off-time to provide a third current to the rf power amplifier according to the sensed linearly amplified high power signal.
2. The power supply of claim 1, wherein,
the first envelope signal is an envelope signal input to the radio frequency power amplifier.
3. The power supply of claim 1, wherein,
obtaining the low power signal and/or the high power signal other than the low power signal in the first envelope signal by any one or any combination of the following: filters, RF detectors, RMS detectors.
4. The power supply of claim 1, wherein,
the power supply further comprises a first mode selection unit for selecting between the constant on-time control mode and the constant off-time control mode.
5. The power supply of claim 1, wherein,
the third circuit comprises a third control unit, a third driving unit and a third inductor;
the third control unit comprises an input end for receiving the sensed linearly amplified high-power signal;
the third control unit further comprises an output terminal for outputting a third control signal to cause the power supply to operate in any one of the following modes: a constant on time control mode with a constant on time, a constant off time control mode with a constant off time;
the third driving unit is used for being connected with the output end of the third control unit and providing a third electric signal to the third inductor based on the third control signal;
and the third inductor is used for providing a third current for the radio frequency power amplifier under the action of a third electric signal.
6. The power supply of claim 1, wherein,
the third driving unit includes: a third switching amplifier, or comprising: an upper power tube and a lower power tube.
7. The power supply of claim 1, wherein,
the third circuit comprises a timing unit for determining the constant on-time or constant off-time.
8. The power supply of claim 1, wherein,
the third circuit includes a comparator to:
(1) when the preset current value I in the third circuitDThe ripple value I of the output current of the second linear circuit is less than or equal toSLWhen the first current is greater than the second current, the first circuit is enabled to operate and provide a first current;
(2) when the preset current value I in the third circuitDGreater than or equal to or greater than the ripple value I of the output current of the second linear circuitSLWhen the third current is not supplied, the third circuit is enabled to supply the third current.
9. The power supply of claim 1, wherein,
the second linear circuit includes a plurality of parallel branches, and:
each branch circuit respectively linearly amplifies a part of signals in the high-power signals and provides corresponding branch circuit voltage according to the linearly amplified part of high-power signals;
and after the voltage superposition of each branch circuit, a second voltage is provided for the radio frequency power amplifier.
10. The power supply of claim 5, wherein,
the first linear circuit includes a first inductor, and the first linear circuit provides a first voltage to the radio frequency power amplifier through mutual inductance between the first inductor and a third inductor in a third circuit.
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| CN201920779740.8U CN210111952U (en) | 2019-05-27 | 2019-05-27 | Power supply for radio frequency power amplifier |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110365296A (en) * | 2019-05-27 | 2019-10-22 | 陕西亚成微电子股份有限公司 | A kind of power supply for radio-frequency power amplifier |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110365296A (en) * | 2019-05-27 | 2019-10-22 | 陕西亚成微电子股份有限公司 | A kind of power supply for radio-frequency power amplifier |
| WO2020238898A1 (en) * | 2019-05-27 | 2020-12-03 | 陕西亚成微电子股份有限公司 | Power supply for radio-frequency power amplifier |
| CN110365296B (en) * | 2019-05-27 | 2024-02-13 | 陕西亚成微电子股份有限公司 | Power supply for radio frequency power amplifier |
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