CN109768774B - Power supply for envelope tracking - Google Patents
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- CN109768774B CN109768774B CN201711102873.3A CN201711102873A CN109768774B CN 109768774 B CN109768774 B CN 109768774B CN 201711102873 A CN201711102873 A CN 201711102873A CN 109768774 B CN109768774 B CN 109768774B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
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Abstract
The present disclosure discloses a power supply for envelope tracking, comprising: a linear amplification unit for linearly amplifying the first envelope signal and outputting a linearly amplified envelope signal; the first control unit is used for filtering a signal in a certain frequency range in the first envelope signal and outputting a first control signal; a first driving unit for providing a first electric signal based on the first control signal; a superimposing unit for superimposing the linearly amplified envelope signal and the first electrical signal for providing the supply voltage of the radio frequency power amplifier. The present disclosure enables a new power supply for envelope tracking that is capable of more efficiently providing a supply voltage to a radio frequency power amplifier by superimposing at least a first electrical signal to a second electrical signal.
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 a radio frequency power amplifier as a function of the output power transmitted by 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 optimal efficiency point, thereby increasing 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.
Disclosure of Invention
To solve the above technical problem, the present disclosure provides a power supply for envelope tracking, including:
a linear amplification unit for linearly amplifying the first envelope signal and outputting a linearly amplified envelope signal;
the first control unit is used for carrying out filtering processing or frequency conversion processing on a signal in a certain frequency range in the first envelope signal and outputting a first control signal;
a first driving unit for providing a first electric signal based on the first control signal;
a superimposing unit for superimposing the linearly amplified envelope signal and the first electrical signal for providing the supply voltage of the radio frequency power amplifier.
Preferably, the first control unit includes any one of: low-pass filter, band-pass filter, high-pass filter, frequency conversion unit.
Preferably, the first envelope signal is an envelope signal input to the radio frequency power amplifier.
Preferably, the power supply further comprises:
the second control unit is used for responding to a first difference signal of the first envelope signal and a signal of the first electric signal after the first envelope signal and the first electric signal pass through the feedback unit to generate a second control signal;
a second driving unit for providing a second electrical signal based on the second control signal, and the second electrical signal is superimposed to the superimposing unit together with the first electrical signal, the linearly amplified envelope signal, so as to provide the supply voltage of the radio frequency power amplifier.
Preferably, the first and second liquid crystal materials are,
the first driving unit comprises a first switching amplifier and a first inductor;
the second driving unit includes a second switching amplifier and a second inductor.
Preferably, the first and second liquid crystal materials are,
the second control unit is selected from any one of: pulse width modulators, pulse density modulators.
Preferably, the first and second liquid crystal materials are,
the first switching amplifier and the second switching amplifier are selected from any one of the following: a GaN switching amplifier, a Si-based switching amplifier.
In a preferred embodiment of the method of the invention,
the third control unit is used for responding to a second difference signal of the first difference signal and a signal obtained by the second electric signal after passing through the feedback unit to generate a third control signal;
a third driving unit for providing a third electrical signal based on the third control signal, and the third electrical signal is superimposed to the superimposing unit together with the second electrical signal, the first electrical signal, and the linearly amplified envelope signal, so as to provide a supply voltage of the radio frequency power amplifier.
Preferably, the first and second liquid crystal materials are,
the fourth control unit is used for responding to a third difference signal of the second difference signal and a signal obtained after the third electric signal passes through the feedback unit to generate a fourth control signal;
a fourth driving unit for providing a fourth electrical signal based on the fourth control signal, and the fourth electrical signal is superimposed to the superimposing unit together with the third electrical signal, the second electrical signal, the first electrical signal, and the linearly amplified envelope signal, so as to provide the supply voltage of the radio frequency power amplifier.
Preferably, the first and second liquid crystal materials are,
the third driving unit comprises a third switching amplifier and a third inductor;
the fourth driving unit comprises a fourth switching amplifier and a fourth inductor;
the third switching amplifier and the fourth switching amplifier are selected from any one of the following: a GaN switching amplifier, a Si-based switching amplifier;
the third control unit and the fourth control unit are selected from any one of the following units: pulse width modulators, pulse density modulators.
Through the technical scheme, the novel power supply for envelope tracking is realized, and the supply voltage can be more efficiently provided for the radio frequency power amplifier in a mode of at least superposing the first electric signal to the second electric signal.
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 a power supply configuration shown in one embodiment of the present disclosure;
FIG. 3 is a schematic diagram of an envelope shown in one embodiment of the present disclosure in the time domain;
FIG. 4 is a schematic diagram of an envelope shown in one embodiment of the present disclosure in the frequency domain;
FIG. 5 is a schematic diagram of a power supply configuration shown in one embodiment of the present disclosure;
FIG. 6 is a schematic diagram of a power supply configuration shown in one embodiment of the present disclosure;
FIG. 7 is a schematic diagram of a bandwidth distribution shown in one embodiment of the present disclosure;
FIG. 8 is a schematic diagram of a power supply configuration shown in one embodiment of the present disclosure;
FIG. 9 is a schematic diagram of a bandwidth distribution shown in one embodiment of the present disclosure;
fig. 10 is a schematic diagram of a power supply configuration shown in one embodiment of the present disclosure.
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:
a linear amplification unit for linearly amplifying the first envelope signal and outputting a linearly amplified envelope signal;
the first control unit is used for carrying out filtering processing or frequency conversion processing on a signal in a certain frequency range in the first envelope signal and outputting a first control signal;
a first drive unit for providing a first electrical signal based on the first control signal;
a superimposing unit for superimposing the linearly amplified envelope signal and the first electrical signal for providing the supply voltage of the radio frequency power amplifier.
For the embodiment described, the supply voltage of the rf power amplifier is provided by superimposing the linearly amplified envelope signal and the first electrical signal, which is quite different from the prior art in that the supply voltage is provided to the rf power amplifier by simply connecting two currents in parallel, the important point being that: the first control unit and the first driving unit.
Preferably, the first control unit may be one of: the device comprises a low-pass filter, a band-pass filter, a high-pass filter and a frequency conversion unit; more preferably, the first control unit is a digital control unit.
Taking filtering as an example, no matter when the first control unit performs filtering processing or frequency conversion processing on the signal in any frequency range in the first envelope signal, the first control unit has a fixed cut-off frequency, and the output frequency bandwidth is also fixed. Therefore, the bandwidth of the first electric signal obtained by the circuit of the first driving unit does not change along with the frequency and bandwidth change of the first envelope signal, so that the power supply efficiency can be kept in a certain frequency range, and the efficiency is prevented from being reduced along with the drastic change of the bandwidth of the first envelope signal.
This is common knowledge in the field of circuits as regards the matching of time constants or delays between the individual circuits. The disclosure does not intend to design and adjust the time constant, and is not repeated herein.
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.
It can be understood that the first electrical signal in the above embodiments may be a first current signal, or may be a first voltage signal. If the signal is the first current signal, the superposition of the superposition unit on the similar signals can be met only by ensuring that the linearly amplified envelope signal is the current signal; similarly, if the envelope signal is the first voltage signal, the superposition unit can superpose the signals of the same kind only by ensuring that the envelope signal amplified linearly is the voltage signal. Hereinafter, the various electrical signals are similar to each other, and will not be described in detail hereinafter.
It should be noted that, if the power supply of the above embodiment is an analog power supply, then: (1) when the first electrical signal is a first current signal, the circuits corresponding to the first electrical signal and the linearly amplified envelope signal can be connected in parallel to realize a superposition unit; (2) when the first electrical signal is a first voltage signal, circuits corresponding to the first electrical signal and the linearly amplified envelope signal can be connected in series to form a superposition unit; further, if the power supply of the above-described embodiment is a digital power supply, any digital circuit can realize the superimposing unit as long as the digital signal representing the first electric signal, the linearly amplified envelope signal, can be superimposed by these digital circuits. For the various embodiments below, it is similar to this paragraph if the power supply is an analog or digital power supply.
In another embodiment, referring to fig. 2, the power supply further comprises:
the second control unit is used for responding to a first difference signal of the first envelope signal and a signal of the first electric signal after the first envelope signal and the first electric signal pass through the feedback unit to generate a second control signal;
a second driving unit for providing a second electrical signal based on the second control signal, and the second electrical signal is superimposed to the superimposing unit together with the first electrical signal, the linearly amplified envelope signal, so as to provide the supply voltage of the radio frequency power amplifier.
For this embodiment, it is equivalent to obtain the signals corresponding to the frequency ranges that are processed by the first control unit by obtaining the first difference signal by subtracting the first envelope signal from the signal of the first electrical signal after passing through the feedback unit. Further, the embodiment generates the second control signal with the first difference signal, and finally obtains the second electric signal by the second driving unit and superimposes it into the superimposing unit. Therefore, the signal finally output by the superposition unit is more complete and approaches to the complete frequency range covered by the envelope signal more, and the efficiency of the power supply is improved.
Referring to fig. 3, a broken-dashed-dotted line 10 represents a voltage corresponding to the second electrical signal, a broken-dashed line 20 represents a voltage corresponding to the first electrical signal, a dashed-dotted line 30 represents a voltage corresponding to the linearly amplified envelope signal, and a solid line 40 represents a total envelope voltage converted by superimposing the second electrical signal, the first electrical signal, and the linearly amplified envelope signal.
With further reference to fig. 4, fig. 4 is a representation of the time domain signal of fig. 3 in the frequency domain.
The above-mentioned embodiment is further characterized in that the first electrical signal, the second electrical signal and the third electrical signal are all related to the first envelope signal, so that the above-mentioned embodiment enables a power supply for envelope tracking. It can be understood that the first electrical signal and the second electrical signal are generated based on the first control signal and the second control signal on the premise that the first envelope signal exists.
In another embodiment of the present invention, the substrate is,
the first driving unit comprises a first switching amplifier and a first inductor;
the second driving unit includes a second switching amplifier and a second inductor.
It can be understood that the switching amplifier is suitable for the occasion with higher frequency. The current in each branch circuit is stored and released through the corresponding first inductor and the second inductor.
In a further embodiment of the method according to the invention,
the second control unit is selected from any one of: pulse width modulators, pulse density modulators. This embodiment is intended to limit the choice of control unit.
In a further embodiment of the method according to the invention,
the first switching amplifier and the second switching amplifier are selected from any one of the following: a GaN switching amplifier, a Si-based switching amplifier. It is clear that this embodiment is for higher frequency signals, since the switching frequency of GaN switching amplifiers can reach very high levels. Similarly, Si-based switching amplifiers (i.e., Si-based switching amplifiers, also known as Si-based switching amplifiers) with high switching frequencies may also be used. It will be appreciated that the relevant switching amplifiers may have more options if not required for higher frequency signals. For the various embodiments of the present disclosure, the selection of the switching amplifier depends on the frequency range of the signal it processes.
In another embodiment, the power supply further comprises:
the third control unit is used for responding to a second difference signal of the first difference signal and a signal obtained by the second electric signal after passing through the feedback unit to generate a third control signal;
a third driving unit for providing a third electrical signal based on the third control signal, and the third electrical signal is superimposed to the superimposing unit together with the second electrical signal, the first electrical signal, and the linearly amplified envelope signal, so as to provide a supply voltage of the radio frequency power amplifier.
For the embodiment, the second difference signal is obtained by subtracting the first difference signal and the second electric signal after passing through the feedback unit, similar to the first difference signal, the signal finally output by the superimposing unit of the embodiment is more complete and approaches to the complete frequency range covered by the envelope signal, and the efficiency of the power supply is still maintained.
It can be appreciated that the power supply may further comprise:
the fourth control unit is used for responding to a third difference signal of the second difference signal and a signal of the third electric signal after passing through the feedback unit to generate a fourth control signal;
a fourth driving unit for providing a fourth electrical signal based on the fourth control signal, and the fourth electrical signal is superimposed to the superimposing unit together with the third electrical signal, the second electrical signal, the first electrical signal, and the linearly amplified envelope signal so as to provide the supply voltage of the radio frequency power amplifier.
Obviously, compared with the previous embodiment, the final output signal of the superimposing unit of this embodiment is more complete and closer to the complete frequency range covered by the envelope signal, and the efficiency of the power supply is still maintained.
Referring to fig. 5, taking as an example that the first control unit 10 includes a low-pass filter:
the low-pass filter 10 can maintain power supply efficiency and prevent efficiency from being reduced when the bandwidth is increased, and is characterized in that the low-pass filter 10 comprises a linear amplifier LR, a switching amplifier SR1, an inductor L1 and a first control unit 10, an input signal Vin passes through the linear amplifier LR to obtain an envelope signal A, an input end of the first control unit 10 is coupled with an envelope signal R of the input signal Vin from the input end of the linear amplifier LR, the first control unit 10 has a fixed cut-off frequency, the output frequency bandwidth of the first control unit is fixed, the envelope signal R passes through a series circuit of the first control unit 10, the switching amplifier SR1 and the inductor L1 to obtain a low-frequency envelope signal B, and the bandwidth of the low-frequency envelope signal B does not change along with the frequency bandwidth of the input signal Vin. In view of low pass filtering, the first driving unit may employ a switching amplifier or a linear amplifier.
Further, in another embodiment, see fig. 6:
the envelope signal R of the input signal Vin is coupled, the first control unit 10 adopts a low-pass filter with a low-pass filtering function of a fixed cut-off frequency, the second control unit 20 adopts a band-pass filtering function with a fixed cut-off frequency, because the input of the second control unit 20 is derived from the difference between the envelope signal R and the signal of the low-frequency envelope signal B passing through the feedback unit, the bandwidth of the signal passing through the second control unit is positioned outside the cut-off frequency of the first control unit 10, the bandwidth distribution is shown in FIG. 7, wherein, the bandwidth between B1-B2 is controlled by the first control unit 10, the bandwidth between B1-B3 and B2-B4 is determined by the second control unit 20, the serial circuit of the second control unit 20, the switching amplifier SR2 and the inductor L2 realizes the bandwidth expansion of the input signal Vin, and the detection of the signal outside the cut-off frequency of the low-frequency filter, and obtaining a detection voltage envelope signal D. The envelope signal A, the envelope signal B and the envelope signal D are superposed and synthesized to form a signal envelope which is closer to the envelope signal R, and the efficiency is improved.
Further, in another embodiment, the power supply for envelope tracking shown in fig. 8 additionally includes a third control unit 30, a switching amplifier SR3, and an inductor L3, based on the power supply shown in fig. 6. The third control unit 30, the switching amplifier SR3 and the inductor L3 are connected in series in sequence, wherein the envelope signal R passes through the series circuit of the first control unit 10, the switching amplifier SR1 and the inductor L1 to obtain a low-frequency envelope signal B, the series circuit of the second control unit 20, the switching amplifier SR2 and the inductor L2 to obtain an envelope signal D, the signal at the input end of the third control unit 30 is subtracted from the signal at the input end of the second control unit 20 and the signal after the envelope signal D passes through the feedback unit to obtain a signal H filtered by the series circuit of the second control unit 20, the switching amplifier SR2 and the inductor L2 in the envelope signal R, and the envelope signal E is obtained after passing through the series circuit of the third control unit 30, the switching amplifier SR3 and the inductor L3, and the bandwidth of the envelope signal E is outside the bandwidth of the envelope signal D, as shown in fig. 9, the third control unit 30 is a filter circuit with a fixed bandwidth, which can pass at a higher frequency than the second control unit 20, the bandwidth between B3-B5 and B4-B6 being determined by the third control unit 30. The superposition synthesis of the envelope signal A, the envelope signal B, the envelope signal D and the envelope signal E approaches the envelope signal R more.
Further, as shown in fig. 10, on the basis of the design of fig. 8, a series circuit of a fourth control unit 40, a switching amplifier SR4, and an inductor L4 is added, wherein an input signal of the fourth control unit 40 is an envelope signal K obtained by subtracting a signal of an envelope signal E after passing through a feedback unit from an envelope signal H, and after passing through a series circuit of a third control unit 30, a switching amplifier SR3, and an inductor L3, an envelope signal F is obtained, and a frequency of the envelope signal F is higher than a frequency of the envelope signal E, and the fourth control unit 40 is a filter circuit with a fixed bandwidth, and a frequency that can pass through the filter circuit is higher than a frequency of the third control unit 30. The superposition synthesis of the envelope signal A, the envelope signal B, the envelope signal D, the envelope signal E and the envelope signal F further approaches the envelope signal R.
The bandwidth expansion is realized in a multi-stage parallel mode, and the bandwidth of each stage is fixed, so that the method can expand the bandwidth while ensuring the efficiency, modularize each stage and simplify the circuit design; and meanwhile, envelope signals applied to the power amplifier are more complete and have higher efficiency due to the multi-stage parallel envelope signal tracking.
Furthermore, the multi-stage parallel bandwidth expansion can be infinite.
Further, each of the control units 10 to 40 has a different frequency threshold or threshold interval, the frequency threshold or threshold interval of the ith driving unit corresponds to the frequency threshold or threshold interval of the ith control unit, and the different frequency thresholds or threshold intervals are arranged in order on the frequency band.
The control unit, the switching amplifier and the low-frequency filter in each stage of parallel circuit can be integrated in one circuit and can be realized by a digital circuit or an analog circuit.
In summary, the most prominent technical effects of the present disclosure are: due to the existence of the superposition unit and the continuous expansion based on the signal difference, this means that the present embodiment can be applied to the future 5 th generation mobile communication technology, the 6 th generation mobile communication technology and even the newer technology, and is not limited to the 4 th generation mobile communication technology represented by LTE or the 3 rd generation mobile communication technology represented by WCDMA.
Another technical effect of the present disclosure is that the linearly amplified envelope signal, the first electrical signal, and even the second electrical signal, the third electrical signal, etc. are all derived from the same envelope signal, and it is on this premise that the above embodiments can achieve a power supply for envelope tracking and maintain a certain efficiency level.
By combining the two technical effects, namely, the method can be taken into consideration in the aspects of different frequencies, the bandwidth can be expanded at certain efficiency, the method can be well downward compatible, and can be oriented to the future, so that the requirement of the future mobile communication technology on the aspect of power supply of the radio frequency power amplifier is met.
In combination with the foregoing, it is obvious that if the embodiments of the present disclosure need to fully function as a superposition unit, a combination of a switching amplifier and a linear amplifier is a preferable choice, but this does not mean that each driving unit can only select a certain amplifier. The reason is that: whether a switching amplifier or a linear amplifier is adopted, according to the principle of the disclosure, the bandwidth expansion can be realized on the basis of certain efficiency all the time.
In addition to the foregoing frequency, delay, for envelope tracking, when the above-described switching amplifier or linear amplifier is employed, amplitude adjustment of the envelope signal may also 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.
Furthermore, although the foregoing discloses that the first control unit comprises any one of: low pass filter, band pass filter, high pass filter. Referring to the envelope representation in fig. 3, since the envelope signal corresponds to radio frequency signals of a plurality of frequencies, then for different frequencies, a low pass filter, a band pass filter, a high pass filter, or even a combination thereof can be selected in a targeted manner:
for example, if a low pass filter is used, the envelope signal corresponding to the first frequency interval range can be passed through the low pass filter and used to derive a low pass filtered signal and further used to supply a certain current through a certain drive unit. If a band pass filter is used, the envelope signal corresponding to the second range of frequency intervals can be passed through the band pass filter and used to derive a band filtered signal and further be used to provide a certain current through a certain drive unit. If a high pass filter is used, the envelope signal corresponding to the third frequency interval range can be passed through the high pass filter and used to derive a high frequency filtered signal and further used to provide a certain current through a certain drive 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.
For the purposes of this disclosure, it is significant to employ a combination of low pass filters, band pass filters and high pass filters, for example: when the single filter cannot well perform the function of the first control unit, cannot well apply to the envelope signal with a wide frequency range, and further cannot well perform the function of the power supply for envelope tracking according to the present disclosure, then the filter unit may be a combination type: for example, the filtering unit includes a low pass filter and a band pass filter and/or a high pass filter, so as to perform envelope tracking more accurately. Depending on the nature of the envelope signal and the application of the power supply bias. It will be readily appreciated that in the case of such a combination, the respective drive units also preferably have drive circuits corresponding to the various filters, for example the various corresponding switching amplifiers.
Further, in a broader aspect, each control unit such as the first control unit, the second control unit, etc. may include not only a filter, but also a frequency conversion unit, which is used to implement a similar scheme through a frequency conversion process instead of a simple filtering process.
More preferably, referring to fig. 10, as mentioned above, based on the principle disclosed in the present disclosure, a further multi-stage expansion is performed based on the structure of the driving units and the control unit and their continuous use of signal differences, wherein: the first driving unit may include a high-speed or ultra-high-speed switching amplifier such as GaN, the second driving unit may include a fast switching amplifier, the third driving unit may include a medium-speed switching amplifier, and the fourth driving unit may include a slow switching amplifier. Correspondingly, each different switching amplifier is controlled by the control signal sent by the different control unit. It should be noted that the super high speed, the fast speed, the medium speed, and the slow speed are mutually related and have clear meanings. The high frequency and the low frequency are also mutually related concepts. These relative concepts are all in keeping with the conventional wisdom in the field of mobile communications technology and are all clear concepts. Thus, the bandwidth that this disclosure can realize fairly even, be the notch cuttype expands step by step.
By now, it can be understood that: without considering power consumption or cost performance, fig. 8 or 10 and its embodiment belong to the preferred embodiment in the present disclosure, taking fig. 10 as an example, it covers a wide range of high, medium and low frequencies comprehensively, and each range is different or non-overlapping. The two preferred embodiments are characterized in that the two preferred embodiments are refined, fully cover related bandwidths, and utilize signal differences to realize bandwidth expansion for multiple times, so that the output height of the superposition unit approaches to the first envelope signal. In contrast to fig. 6, fig. 8 and 10 do not show a feedback unit, but illustrate feedback control.
In summary, the present disclosure can be applied to future 5 th generation mobile communication technology, 6 th generation mobile communication technology, and even newer technology, without being limited to 4 th generation mobile communication technology represented by LTE or 3 rd generation mobile communication technology represented by WCDMA.
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 generally, 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 should 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 by the scope of the following patent claims and not by the specific details presented by way of the description and illustration of the embodiments herein.
Claims (5)
1. A power supply for envelope tracking, comprising: the device comprises a linear amplification unit, N control units, N driving units, N-1 feedback units and a superposition unit; a linear amplification unit for linearly amplifying the first envelope signal and outputting a linearly amplified envelope signal;
the first control unit in the N control units is used for carrying out filtering processing or frequency conversion processing on a signal in a certain frequency range in the first envelope signal and outputting a first control signal; the first control unit comprises a filter unit or a frequency conversion unit; the filter unit comprises a low-pass filter, a band-pass filter and/or a high-pass filter; a first drive unit of the N drive units for providing a first electrical signal based on the first control signal;
the ith control unit in the N control units is used for responding to the ith-1 difference value of the ith-2 difference value signal and the signal fed back by the ith-1 feedback unit when i is greater than 2, and outputting an ith control signal; when i =2, the controller is used for responding to the i-1 difference value of the first envelope signal and the signal fed back by the i-1 feedback unit and outputting an i control signal; the ith control unit comprises a pulse width modulator or a pulse density modulator;
an ith driving unit of the N driving units for providing an ith electric signal based on the ith control signal;
each control unit has different frequency threshold values or threshold value intervals, the frequency threshold value or threshold value interval of the ith driving unit corresponds to the frequency threshold value or threshold value interval of the ith control unit, and the frequency threshold value or threshold value range of the ith control unit and the frequency threshold value or threshold value interval of the (i-1) th control unit are sequentially arranged on a frequency band;
a superimposing unit for superimposing the linearly amplified envelope signal and the N electrical signals in order to provide a supply voltage for the radio frequency power amplifier;
wherein i is less than or equal to N, and both i and N are positive integers which are more than or equal to 2.
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 or 2, wherein: the first driving unit comprises a first switching amplifier and a first inductor; the second driving unit includes a second switching amplifier and a second inductor.
4. The power supply of claim 3, wherein: the first switching amplifier and the second switching amplifier are selected from any one of the following: a GaN switching amplifier, a Si-based switching amplifier.
5. The power supply of claim 1, wherein: the ith driving unit comprises an ith switching amplifier and an ith inductor; the ith switching amplifier is selected from any one of: a GaN switching amplifier, a Si-based switching amplifier.
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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 |
| 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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