CN109286374B - Power supply for envelope tracking - Google Patents
Power supply for envelope tracking Download PDFInfo
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- CN109286374B CN109286374B CN201710589788.8A CN201710589788A CN109286374B CN 109286374 B CN109286374 B CN 109286374B CN 201710589788 A CN201710589788 A CN 201710589788A CN 109286374 B CN109286374 B CN 109286374B
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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
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/189—High frequency amplifiers, e.g. radio frequency amplifiers
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/20—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers
- H03F3/21—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers with semiconductor devices only
- H03F3/211—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers with semiconductor devices only using a combination of several amplifiers
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F2200/00—Indexing scheme relating to amplifiers
- H03F2200/451—Indexing scheme relating to amplifiers the amplifier being a radio frequency amplifier
Abstract
The present disclosure discloses a power supply for envelope tracking, comprising: the frequency conversion unit is used for carrying out frequency conversion processing on the first envelope signal and outputting a first frequency conversion signal; a first control unit for generating a first control signal in response to the first frequency-converted signal; a first drive unit for providing a first varying envelope voltage based on the first control signal; a delay unit for performing delay processing on the first envelope signal and outputting a first delayed signal; a second driving unit for providing a second envelope voltage based on the first delay signal; and the superposition unit is used for superposing the first variable-frequency envelope voltage and the second envelope voltage so as to provide a complete envelope voltage of the radio-frequency power amplifier. The present disclosure enables a new power supply for envelope tracking capable of providing a supply voltage to a radio frequency power amplifier by superimposing a first, variable frequency envelope voltage and a second envelope voltage.
Description
Technical Field
The present disclosure relates to the field of mobile communications, and more particularly, to a power supply for envelope tracking.
Background
In the field of mobile communications, power supplies with envelope tracking capabilities may be used in order to improve the efficiency of radio frequency power amplifiers.
Envelope tracking may dynamically change the supply voltage of the radio frequency power amplifier with the transmitted output power of the radio frequency power amplifier. Envelope tracking may also dynamically adjust the supply voltage of the power amplifier to track the amplitude of the envelope of the rf input signal.
When the signal envelope becomes large, the supply voltage is boosted; when the signal envelope becomes small, the supply voltage is lowered. In this way, the RF power amplifier can operate in a large part of the operating range, close to its optimum efficiency point, thereby improving the energy utilization of the mobile communication device.
How to further improve the efficiency of a power supply for envelope tracking is always a technical problem to be considered in the art.
Drawings
FIG. 1 is a schematic diagram of a power supply configuration shown in one embodiment of the present disclosure;
FIG. 2 is a schematic diagram of an envelope shown in one embodiment of the present disclosure;
FIG. 3 is a schematic diagram of a power supply configuration shown in one embodiment of the present disclosure;
fig. 4 is a schematic diagram of a power supply configuration shown in yet another embodiment of the present disclosure.
Disclosure of Invention
To solve the above technical problem, the present disclosure provides a power supply for envelope tracking, including:
the frequency conversion unit is used for carrying out frequency conversion processing on the first envelope signal and outputting a first frequency conversion signal;
a first control unit for generating a first control signal in response to the first frequency-converted signal;
a first drive unit for providing a first varying envelope voltage based on the first control signal;
a delay unit for performing delay processing on the first envelope signal and outputting a first delayed signal;
a second driving unit for providing a second envelope voltage based on the first delay signal;
and the superposition unit is used for superposing the first variable-frequency envelope voltage and the second envelope voltage so as to provide a supply voltage of the radio-frequency power amplifier.
Preferably, the frequency conversion unit includes any one or any combination of the following: low pass filter, band pass filter, high pass filter.
Preferably, the first control unit comprises any one of: pulse width modulators, pulse density modulators.
Preferably, the first driving unit includes a switching amplifier, and the second driving unit includes a linear amplifier.
Preferably, the delay unit comprises any type of delay circuit or buffer circuit.
Preferably, when the frequency of the first envelope signal belongs to a first set threshold interval, and/or when the amplitude of the first envelope signal belongs to a second set threshold interval, the frequency conversion unit outputs the first frequency conversion signal.
Preferably, the first driving unit further comprises an inductor, and the switching amplifier is connected to the linear amplifier through the inductor.
Preferably, the first driving unit includes a first high frequency switching amplifier and a second high frequency switching amplifier, and a switching frequency of the first high frequency switching amplifier is different from a frequency of the second high frequency switching amplifier.
Preferably, the second drive unit comprises an LDO or a class a or class AB linear amplifier.
Preferably, the superposition unit comprises a power tube.
Through the technical scheme, the novel power supply for envelope tracking is realized, and the supply voltage can be provided for the radio frequency power amplifier in a mode of superposing the first voltage and the second voltage.
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 embodiments of the invention 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.
Referring to fig. 1, the present disclosure proposes a power supply for envelope tracking, comprising:
the frequency conversion unit is used for carrying out frequency conversion processing on the first envelope signal and outputting a first frequency conversion signal;
a first control unit for generating a first control signal in response to the first frequency-converted signal;
a first drive unit for providing a first varying envelope voltage based on the first control signal;
a delay unit for performing delay processing on the first envelope signal and outputting a first delayed signal;
a second driving unit for providing a second envelope voltage based on the first delay signal;
and the superposition unit is used for superposing the first variable-frequency envelope voltage and the second envelope voltage so as to provide a supply voltage of the radio-frequency power amplifier.
For the described embodiment, the supply voltage of the rf power amplifier is provided by superimposing the first voltage and the second voltage, which is distinct from the prior art in which the supply voltage is provided to the rf power amplifier by a single voltage or two currents in parallel. Both the first and second envelope voltages are related to the first envelope signal, so that the above embodiments can achieve a power supply for envelope tracking. It can be understood that the first variable-frequency envelope voltage and the second envelope voltage are generated on the basis of the first control signal and the first delay signal on the premise that the first envelope signal exists.
Since the envelope signal corresponds to radio frequency signals of multiple frequencies, the above embodiment includes a frequency conversion unit, so as to obtain a first frequency conversion signal after frequency conversion of the first envelope signal, and further, the first frequency conversion signal is used for providing a first frequency conversion envelope voltage through the first driving unit. The important points of the present embodiment are: the frequency conversion unit is not simply filtering but provides the frequency converted signal according to a filtering process. On the premise that the first envelope signal is present, the variable frequency signal is directed to the first envelope signal, so that the first control unit generates the first control signal based on the variable frequency signal, and on the basis, the first variable frequency envelope voltage is further provided by the first drive unit. It can be appreciated that the first converted envelope voltage differs from the first envelope signal at least in frequency and is used for envelope tracking.
In addition, the frequency conversion unit has a time constant, which causes the first frequency conversion envelope voltage and the first envelope signal to have a time delay effect, so that the delay unit also performs a delay process and is further used for providing the second envelope voltage through the second driving unit. It can be seen that the second envelope voltage also has a time delay effect with the first envelope signal. In fact, there are no ideal devices or cells without delay effects.
As far as the matching problem of the delay effect is concerned, this is common knowledge in the field of circuits. The disclosure does not refer to how to design and match the time constants of the delay circuits, and is not described herein. In another embodiment, the delay cells comprise any type of delay circuit or buffer circuit, whether analog or digital.
It should be noted that, if the power supply in the above embodiment is an analog power supply, the circuits corresponding to the first variable-frequency envelope voltage and the second envelope voltage may be connected in series to implement the superimposing unit; if the power supply of the above-described embodiment is a digital power supply, any digital circuit can be used to realize the superimposing unit as long as the digital signal representing the first envelope voltage and the digital signal representing the second envelope voltage can be superimposed.
Referring to fig. 2, from top to bottom, the uppermost red curve 10 illustrates the first converted envelope voltage, the middle blue curve 20 illustrates the second envelope voltage, and the lowermost black curve 30 illustrates the envelope signal to be tracked that is input to the rf power amplifier.
It should be noted that, since the first driving unit is controlled by the first control signal, in combination with the state of the art and the development thereof, it is preferable that, in another embodiment, the first control unit includes any one of the following: pulse width modulators, pulse density modulators. However, the first control unit is not limited thereto.
Similarly, in another embodiment, the first drive unit comprises a switching amplifier. Thus, a pulse width modulator or a pulse density modulator, or even a combination thereof, may cooperate with one or more switching amplifiers to provide a first converted envelope voltage, and may be a multi-stage parallel configuration, e.g., each stage comprising at least one pulse width modulator and one switching amplifier, multiplexed and then converted to a voltage signal, thereby forming various embodiments of the present disclosure.
In another embodiment, the second drive unit comprises a linear amplifier.
Based on the characteristics of the envelope signal itself, in combination with the foregoing, it is obvious that the embodiments of the present disclosure have respective characteristics of the switching amplifier and the linear amplifier, and the combination of the switching amplifier and the linear amplifier is a preferred choice if the overlapping effect of the first envelope voltage and the second envelope voltage needs to be fully exerted, but this does not mean that the first and second driving units are limited thereto as long as they are suitable for envelope tracking.
That is, for envelope tracking, in addition to the foregoing frequency, delay, when the above-described switching amplifier or linear amplifier is employed, amplitude adjustment of the envelope signal may be involved. Various amplifiers are used for different amplitude adjustment, and many aspects are disclosed in the prior art, and the disclosure does not attempt to propose a new amplitude adjustment means, and is not described in detail herein.
In another embodiment, the frequency conversion unit includes any one or any combination of the following: low pass filter, band pass filter, high pass filter.
It can be seen that the embodiments relate to the profiling of frequency conversion units. In connection with the envelope illustration in fig. 2, since the envelope signal corresponds to radio frequency signals of a plurality of frequencies, a low pass filter, a band pass filter, and a high pass filter can be selected for different frequencies.
For example, if a low pass filter is used, the envelope signal corresponding to the first frequency interval range can be passed through the filter and used to derive the first converted signal and further used by the first drive unit to provide the first converted envelope voltage. If a band pass filter is used, the envelope signal corresponding to the second frequency interval range can pass the filter and be used to derive the first frequency converted signal and further be used to provide the first frequency converted envelope voltage by the first drive unit. If a high pass filter is used, the envelope signal corresponding to the third frequency interval range can pass through the filter and be used to derive the first converted signal and further be used to provide the first converted envelope voltage by the first driving unit. As the name implies, the first frequency interval range is often lower than the second frequency interval range, and the second frequency interval range is lower than the third frequency interval range, in terms of the threshold value or the threshold value range of the frequency.
Preferably, the low-pass filter is mainly used, mainly in order to enable the part of the envelope curve in the envelope signal corresponding to the first frequency interval range, where the peak is larger or the envelope is larger, to be used for providing the first voltage. However, band-pass and high-pass filters are still significant, for example: when the single filter cannot well perform the function of the frequency conversion unit, the single filter cannot be well applied to envelope signals with a wider frequency range, and further cannot well perform the function of the power supply for envelope tracking disclosed by the disclosure, then the frequency conversion unit may be of a combined type, and may further include a band-pass filter and/or a high-pass filter, thereby performing envelope tracking more accurately. It is easy to understand that in this combination case, the first driving unit also preferably has corresponding driving circuits corresponding to various filters, such as various corresponding switching amplifiers.
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.
Furthermore, embodiments of the present disclosure do not exclude feedback control or feedforward control, which need to be considered as practical, or a combination of both. According to control theory, in the case of feedback control, in combination with feedforward control, it is possible to have better control capability for some systems.
Further, the present disclosure allows for further integration of feedback and/or feedforward control to better control errors and delays, including but not limited to envelope delays and error compensation, provided that the fundamental requirements for efficiency of radio frequency power amplifiers are met.
In another embodiment, the frequency conversion unit outputs the first frequency conversion signal when the frequency of the first envelope signal belongs to a first set threshold interval and/or when the amplitude of the first envelope signal belongs to a second set threshold interval.
As already mentioned above, the envelope signal often relates to different amplitudes and different frequencies, as seen in connection with fig. 2, and the above-mentioned embodiments are fully explained with regard to the selection of the frequency converting unit. However, the present embodiment may only be directed to the frequency, in other words, whether the frequency conversion unit works or not and how to work, may be controlled by the frequency of the envelope signal, for example, the first setting threshold interval described in the present embodiment.
Since the present embodiment includes a parallel scheme, that is, when the amplitude of the first envelope signal belongs to a second set threshold interval, the frequency conversion unit may also output the first frequency conversion signal. Obviously, this situation may also be controlled with respect to the amplitude, in other words, whether the frequency converter unit is operating or not and how it is operating, for example by said second set threshold interval. From an engineering point of view, at higher frequencies, control by amplitude is easier to achieve than control by frequency. However, this does not prevent the implementation of a frequency conversion unit controlled jointly by both frequency and amplitude factors.
Further, in another embodiment, when the frequency conversion unit includes a multi-pass filter, such as the low-pass filter and the band-pass filter described above (or in a broader sense, a filter in a class a frequency interval range and a filter in a class b frequency interval range, where the class a frequency interval range and the class b frequency interval range do not overlap), in addition to the first set threshold interval of the previous embodiment, the frequency conversion unit may further include: and when the amplitude of the first envelope signal is within a second set threshold interval, the frequency conversion unit outputs a second frequency conversion signal.
In this case, when the first driving unit includes at least two switching amplifiers, the first control unit is further configured to generate a second control signal in response to the second variable frequency signal; a first drive unit further configured to provide a first varying envelope voltage based on the second control signal. Thus, the frequency conversion unit may comprise multiple filters of different characteristics and generate different frequency converted signals, the first control unit may generate different control signals in response to the different frequency converted signals, and the first drive unit may provide the first frequency converted envelope voltage based on the different control signals.
Referring to fig. 3, in another embodiment, the first driving unit further includes an inductor, and the switching amplifier is connected to the second driving unit through the inductor; the superposition unit comprises a power tube. In this way, when the first drive unit is selected to be the switching amplifier and the second drive unit is selected to be the linear amplifier, the output end of the switching amplifier is connected with one end of the inductor, and the other end of the inductor is connected with the input end of the power tube; the output end of the linear amplifier is connected with the control end of the power tube, and one input end of the linear amplifier is connected with the output end of the power tube; the first voltage provided by the first driving unit stores and releases energy through the inductor. And the power tube superposes the first voltage and a second voltage provided by the second driving unit, thereby providing a supply voltage for the radio frequency power amplifier. In fig. 3, P1 denotes a switching amplifier in the first driving unit, P2 denotes a linear amplifier in the second driving unit, and M denotes a power tube. The second driving unit may also be a low voltage step-down regulator (abbreviated as LDO).
Referring to fig. 4, further, in another embodiment, the other end of the inductor is connected to both the input terminal of the power transistor and the power terminal of the linear amplifier, and one input terminal of the linear amplifier is connected to the output terminal of the power transistor; the linear amplifier and the power tube superpose the first voltage and a second voltage provided by the second driving unit, so that a supply voltage is provided for the radio frequency power amplifier. Furthermore, although the superimposing unit is implemented by a power tube in this embodiment, since the envelope signal is not a direct current signal, the superimposing unit does not exclude the implementation using a transformer or a capacitor: a first voltage may be input to a first coil of the transformer, and a second voltage may be input to a second coil of the transformer; it is also possible to input the first voltage to one end of the capacitor and the second voltage to the other end of the capacitor.
In another embodiment, the first driving unit includes a first high frequency switching amplifier, a second high frequency switching amplifier, and a switching frequency of the first high frequency switching amplifier is different from a frequency of the second high frequency switching amplifier.
In combination with the foregoing embodiments, the present embodiment is limited to the case where the first driving unit includes a plurality of switching amplifiers with different characteristics, and particularly includes switching amplifiers with different frequencies.
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 invention 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, R0M, PR0M, EPR0M, EEPR0M, 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 in the description and illustrations of the embodiments presented herein.
Claims (8)
1. A power supply for envelope tracking, comprising:
the frequency conversion unit is used for carrying out frequency conversion processing on the first envelope signal and outputting a first frequency conversion signal;
a first control unit for generating a first control signal in response to the first frequency-converted signal;
a first drive unit for providing a first varying envelope voltage based on the first control signal;
a delay unit for performing delay processing on the first envelope signal and outputting a first delayed signal;
a second driving unit for providing a second envelope voltage based on the first delay signal;
a superimposing unit for superimposing the first and second converted envelope voltages to provide a supply voltage for a radio frequency power amplifier;
wherein, the frequency conversion unit comprises any one of the following or any combination thereof: a low-pass filter, a band-pass filter, a high-pass filter;
when the frequency of the first envelope signal belongs to a first set threshold interval and/or when the amplitude of the first envelope signal belongs to a second set threshold interval, the frequency conversion unit outputs the first frequency conversion signal.
2. The power supply of claim 1, wherein the first control unit comprises any one of: pulse width modulators, pulse density modulators.
3. The power supply of claim 1, wherein the first drive unit comprises a switching amplifier and the second drive unit comprises a linear amplifier.
4. The power supply of claim 1, wherein the delay unit comprises any type of digital or analog type, delay circuit, or buffer circuit.
5. The power supply of claim 3, wherein the first drive unit further comprises an inductor, and the switching amplifier is connected to the second drive unit through the inductor.
6. The power supply as claimed in claim 3, wherein the first driving unit includes a first high frequency switching amplifier, a second high frequency switching amplifier, and a switching frequency of the first high frequency switching amplifier is different from a frequency of the second high frequency switching amplifier.
7. The power supply of claim 3, wherein the second drive unit comprises an LDO or a class A or AB linear amplifier.
8. The power supply of claim 1, wherein the superposition cell comprises a power tube.
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| CN201710589788.8A CN109286374B (en) | 2017-07-19 | 2017-07-19 | Power supply for envelope tracking |
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| CN201710589788.8A CN109286374B (en) | 2017-07-19 | 2017-07-19 | Power supply for envelope tracking |
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| CN109286374B true CN109286374B (en) | 2021-03-02 |
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| CN110138343A (en) * | 2019-05-27 | 2019-08-16 | 陕西亚成微电子股份有限公司 | A kind of power supply for radio-frequency power amplifier based on feedback |
| CN113839627A (en) * | 2020-06-24 | 2021-12-24 | 中兴通讯股份有限公司 | Envelope amplifier, envelope tracking power amplifier and signal processing method |
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