CN108206703B - Radio frequency transmitting circuit, transmitter and user terminal - Google Patents
Radio frequency transmitting circuit, transmitter and user terminal Download PDFInfo
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- CN108206703B CN108206703B CN201611185845.8A CN201611185845A CN108206703B CN 108206703 B CN108206703 B CN 108206703B CN 201611185845 A CN201611185845 A CN 201611185845A CN 108206703 B CN108206703 B CN 108206703B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/02—Transmitters
- H04B1/04—Circuits
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/02—Transmitters
- H04B1/04—Circuits
- H04B2001/0408—Circuits with power amplifiers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/02—Transmitters
- H04B1/04—Circuits
- H04B2001/0408—Circuits with power amplifiers
- H04B2001/045—Circuits with power amplifiers with means for improving efficiency
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Abstract
A radio frequency transmitting circuit, a transmitter and a user terminal are provided. The radio frequency transmission circuit includes: input direction coupler, envelope detection circuit, first envelope tracking circuit, second envelope tracking circuit, signal merging circuit and radio frequency power amplifier, wherein: the first envelope tracking circuit is coupled with the signal merging circuit and is suitable for carrying out envelope tracking on a low-frequency part of the envelope signal, the frequency of which is less than a first frequency, so as to generate a first envelope tracking signal which is synchronous with the first signal; the second envelope tracking circuit is coupled with the signal merging circuit and is suitable for carrying out envelope tracking on a high-frequency part of the envelope signal, the frequency of which is greater than a second frequency, and generating a second envelope tracking signal which is synchronous with the first signal, wherein the first frequency is less than or equal to the second frequency. By applying the scheme, the working efficiency of the radio frequency power amplifier can be improved.
Description
Technical Field
The invention relates to the technical field of electronic circuits, in particular to a radio frequency transmitting circuit, a transmitter and a user terminal.
Background
In the current communication system, a signal to be transmitted generated by a transmitting end is usually amplified by a radio frequency power amplifier and then transmitted to a receiving end by an antenna.
In order to improve the working efficiency of the radio frequency power amplifier, before the amplification processing of the radio frequency power amplifier, the envelope of a signal to be transmitted generally needs to be tracked, so that a bias voltage which changes along with the envelope signal can be provided for the radio frequency power amplifier, the working efficiency of the radio frequency power amplifier is improved, and the purpose of improving the working efficiency of the radio frequency power amplifier is achieved.
However, in some cases, it is still difficult to achieve high operating efficiency of the rf power amplifier by the bias voltage provided by the existing circuit for envelope tracking of the signal to be transmitted.
Disclosure of Invention
The invention solves the technical problem of how to improve the working efficiency of the radio frequency power amplifier.
To solve the above technical problem, an embodiment of the present invention provides a radio frequency transmitting circuit, including: input direction coupler, envelope detection circuit, first envelope tracking circuit, second envelope tracking circuit, signal merging circuit and radio frequency power amplifier, wherein: the input directional coupler is coupled with the envelope detection circuit and the radio frequency power amplifier and is suitable for separating a signal to be transmitted into a first signal and a second signal, wherein the first signal is a signal suitable for being transmitted by the radio frequency power amplifier, and the second signal is a signal suitable for providing an envelope signal; the envelope detection circuit, coupled to the first and second envelope tracking circuits, is adapted to separate the envelope signal from the second signal; the first envelope tracking circuit is coupled with the signal merging circuit and is suitable for carrying out envelope tracking on a low-frequency part of the envelope signal, the frequency of which is less than a first frequency, so as to generate a first envelope tracking signal which is synchronous with the first signal; the second envelope tracking circuit is coupled with the signal merging circuit and is suitable for carrying out envelope tracking on a high-frequency part of the envelope signal, the frequency of which is greater than a second frequency, so as to generate a second envelope tracking signal which is synchronous with the first signal, wherein the first frequency is less than or equal to the second frequency; the signal combination circuit is coupled with the radio frequency power amplifier and is suitable for combining the first envelope tracking signal and the second envelope tracking signal to generate a bias voltage supply signal; the radio frequency power amplifier is suitable for outputting the second signal after amplifying the voltage of the signal provided by the bias voltage as the bias voltage.
Optionally, the first envelope tracking circuit comprises: a low pass filter, and a DC-DC converter, wherein: the low-pass filter is coupled with the envelope detection circuit and is suitable for performing low-pass filtering on the envelope signal to obtain a low-frequency part of the envelope signal, wherein the frequency of the low-frequency part is less than a first frequency; the DC-DC converter, which is adapted to be coupled to the low pass filter, is adapted to perform envelope tracking on a low frequency portion of the envelope signal having a frequency smaller than a first frequency, resulting in a first envelope tracking signal synchronized with the first signal.
Optionally, the DC-DC converter is a step-up and step-down DC-DC converter.
Optionally, the second envelope tracking circuit comprises: a high pass filter, a linear amplifier, and a switching circuit, wherein: the high-pass filter is coupled with the envelope detection circuit and is suitable for carrying out high-pass filtering on the envelope signal to obtain a high-frequency part of the envelope signal, wherein the frequency of the high-frequency part is greater than a second frequency; the linear amplifier is coupled with the high-pass filter and is suitable for carrying out envelope tracking on a high-frequency part of the envelope signal, the frequency of which is greater than a second frequency, so as to obtain a second envelope tracking signal which is synchronous with the first signal; the switch circuit is coupled with the linear amplifier and is suitable for closing the second envelope tracking circuit and inputting the second envelope tracking signal to the signal combination circuit when the voltage of the second envelope tracking signal is greater than that of the first envelope tracking signal.
Optionally, when the first frequency is equal to the second frequency, the first frequency and the second frequency are frequencies corresponding to a case where the conversion efficiency of the DC-DC converter is seventy percent of the maximum conversion efficiency.
Optionally, the switch circuit is a diode, and an anode of the diode is coupled to the linear amplifier and a cathode of the diode is coupled to the signal combining circuit.
Optionally, the radio frequency transmission circuit further includes: and the delay processing unit is suitable for performing delay processing on at least two of the first envelope tracking signal, the second envelope tracking signal and the first signal so as to synchronize the first envelope tracking signal, the second envelope tracking signal and the first signal.
Optionally, the delay processing unit includes at least two following delays: the first delayer is coupled between the DC-DC converter and the signal merging circuit and is suitable for carrying out time delay processing on a first envelope tracking signal output by the DC-DC converter; the second delayer is coupled between the linear amplifier and the switch circuit and is suitable for carrying out time delay processing on a second envelope tracking signal output by the linear amplifier; and the third delayer is coupled between the input direction coupler and the radio frequency power amplifier and is suitable for carrying out time delay processing on the first signal.
Optionally, the radio frequency transmission circuit further includes: and the clamping circuit is coupled between the signal combining circuit and the radio frequency power amplifier and is suitable for clamping the voltage of the output signal of the signal combining circuit.
The embodiment of the invention also provides a radio frequency transmitter, which comprises any one of the radio frequency transmitting circuits.
The embodiment of the invention also provides the user terminal, and the user terminal comprises any one of the radio frequency transmitters.
Compared with the prior art, the technical scheme of the embodiment of the invention has the following beneficial effects:
by adopting the scheme, the first envelope tracking circuit carries out envelope tracking on the low-frequency part of the envelope signal and the second envelope tracking circuit carries out envelope tracking on the high-frequency part of the envelope signal by setting the first envelope tracking circuit and the second envelope tracking circuit, and the conversion efficiency of the first envelope tracking circuit can be improved and the working efficiency of the radio-frequency power amplifier can also be improved by reasonably setting the first frequency and the second frequency.
Further, since the DC-DC converter has a high conversion efficiency at low frequency, the DC-DC converter and the switching circuit are provided in the first envelope tracking circuit, so that the switching circuit is turned on when the voltage of the first envelope tracking signal is greater than the threshold voltage, and further the DC-DC converter mainly performs envelope tracking on the envelope signal at low frequency, thereby improving the working efficiency of the radio frequency power amplifier as much as possible.
Further, the frequency division point of the first envelope tracking circuit and the second envelope tracking circuit is set to be the frequency corresponding to the maximum conversion efficiency of the DC-DC converter, so that the working efficiency of the radio frequency power amplifier can be maximized.
Furthermore, a clamping circuit is arranged in the high-frequency envelope tracking circuit, so that the radio frequency power amplifier can be prevented from being damaged due to overlarge voltage of the second envelope tracking signal.
Drawings
Fig. 1 is a schematic circuit diagram of an rf transmitting circuit according to an embodiment of the present invention;
FIG. 2 is a schematic circuit diagram of another RF transmitting circuit according to an embodiment of the present invention;
fig. 3 is a schematic circuit diagram of a radio frequency transmitting circuit according to another embodiment of the present invention.
Detailed Description
At present, a direct current level (DC-DC) converter is generally used to track an envelope of a signal to be transmitted, so as to provide a bias voltage for a radio frequency power amplifier, thereby improving the working efficiency of the radio frequency power amplifier. However, as the operating frequency of the DC-DC converter increases, the switching loss of the DC-DC converter increases, and the conversion efficiency of the DC-DC converter decreases, so that the effect of increasing the operating efficiency of the rf power amplifier is not achieved.
Aiming at the problems of the DC-DC converter, an improved scheme is as follows: the linear amplifier is adopted to replace a DC-DC converter, namely, the linear amplifier tracks the envelope of a signal to be transmitted, and then provides a bias voltage for the radio frequency power amplifier. However, this solution does not improve the operating efficiency of the rf power amplifier well due to the inherent low conversion efficiency of the linear amplifier.
In view of the above problems, the present invention provides a radio frequency transmitting circuit, where the radio frequency transmitting circuit is provided with a first envelope tracking circuit and a second envelope tracking circuit at the same time, the first envelope tracking circuit performs envelope tracking on a low-frequency part of the envelope signal, and the second envelope tracking circuit performs envelope tracking on a high-frequency part of the envelope signal, and by reasonably setting a first frequency and a second frequency, the conversion efficiency of the first envelope tracking circuit can be improved, and the working efficiency of the radio frequency power amplifier can also be improved.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
Referring to fig. 1, an embodiment of the present invention provides a radio frequency transmission circuit 1, where the radio frequency transmission circuit 1 may include: an input directional coupler 11, an envelope detection circuit 12, a first envelope tracking circuit 13, a second envelope tracking circuit 14, a signal combining circuit 15 and a radio frequency power amplifier 16, wherein:
the input directional coupler 11, coupled to the envelope detection circuit 12 and the rf power amplifier 16, is adapted to split a signal to be transmitted s0 into a first signal s1 and a second signal s2, the first signal s1 being a signal adapted to be transmitted through the rf power amplifier 16, the second signal s2 being a signal adapted to provide an envelope signal s 3;
the envelope detection circuit 12, coupled to the first envelope tracking circuit 13 and the second envelope tracking circuit 14, is adapted to separate the envelope signal s3 from the second signal s 2;
the first envelope tracking circuit 13, coupled to the signal combining circuit 15, is adapted to perform envelope tracking on a low frequency portion of the envelope signal s3 having a frequency lower than a first frequency f1, and generate a first envelope tracking signal n1 synchronized with the first signal s 1;
the second envelope tracking circuit 14, coupled to the signal combining circuit 15, is adapted to perform envelope tracking on a high frequency portion of the envelope signal s3 with a frequency greater than a second frequency f2, and generate a second envelope tracking signal n2 synchronized with the first signal s1, where the first frequency f1 is less than or equal to the second frequency f 2;
the signal combination circuit 15, coupled to the rf power amplifier 16, is adapted to combine the first envelope tracking signal n1 and the second envelope tracking signal n2 to generate a bias voltage providing signal p 1;
the rf power amplifier 16 is adapted to output the second signal s2 by amplifying the voltage of the bias voltage providing signal p1 as a bias voltage.
In a specific implementation, the first frequency f1 may be equal to the second frequency f2, or may not be equal to the second frequency f 2. When the first frequency f1 and the second frequency f2 are equal, only two envelope tracking circuits, namely the first envelope tracking circuit 13 and the second envelope tracking circuit 14, are arranged in the radio frequency transmission circuit 1. When the first frequency f1 is not equal to the second frequency f2, in addition to the first envelope tracking circuit and the second envelope tracking circuit, another envelope tracking circuit may be further disposed in the radio frequency transmitting circuit 1 to track the envelope signal s3 of the frequency between the first frequency f1 and the second frequency f 2. The other envelope tracking circuit may include only one envelope tracking circuit, or may include a plurality of envelope tracking circuits, which is not limited in particular. The circuit structure of the other envelope tracking circuit is not limited as long as the envelope signal s3 having a frequency between the first frequency f1 and the second frequency f2 can be tracked.
By properly setting the first frequency f1 and the second frequency f2, the conversion efficiency of the first envelope tracking circuit 13 and the second envelope tracking circuit 14 can be maximized, and the operating efficiency of the rf power amplifier 16 can be maximized.
In specific implementations, the first envelope tracking circuit 13 may have various circuit configurations, and is not particularly limited as long as the low-frequency portion of the envelope signal s3 can be envelope-tracked.
In an embodiment of the present invention, referring to fig. 2, the first envelope tracking circuit 13 may include: a low pass filter 131 and a DC-DC converter 132, wherein:
the low-pass filter 131 is coupled to the envelope detection circuit 12 and adapted to perform low-pass filtering on the envelope signal s3 to obtain a low-frequency portion of the envelope signal s3 with a frequency smaller than the first frequency f 1;
the DC-DC converter 132, which is adapted to be coupled to the low pass filter 131, is adapted to perform envelope tracking on a low frequency portion of the envelope signal s3 having a frequency lower than the first frequency f1, resulting in a first envelope tracking signal n1 synchronized with the first signal s 1.
Since the DC-DC converter 132 has low switching loss and high conversion efficiency when operating at a low frequency, the DC-DC converter 132 can be used to perform envelope tracking on the low-frequency part of the envelope signal s3, so as to ensure the conversion efficiency when performing envelope tracking on the envelope signal s3 at a low frequency.
In a specific implementation, the DC-DC converter 132 may include various types, for example, the DC-DC converter 132 may be a step-up DC-DC converter, a step-down DC-DC converter, or a step-up step-down DC-DC converter.
In specific implementation, the second envelope tracking circuit 14 may have various circuit structures, and is not particularly limited as long as it can perform envelope tracking on a high-frequency portion of the envelope signal s3, which has a frequency greater than the second frequency f 2.
In an embodiment of the present invention, the second envelope tracking circuit 14 may include: a high pass filter 141, a linear amplifier 142, and a switching circuit 143, wherein:
the high-pass filter 141, coupled to the envelope detection circuit 12, is adapted to perform high-pass filtering on the envelope signal s3 to obtain a high-frequency portion of the envelope signal with a frequency greater than a second frequency f 2;
the linear amplifier 142, coupled to the high-pass filter 141, is adapted to perform envelope tracking on a high-frequency portion of the envelope signal s3 with a frequency greater than a second frequency f2, resulting in a second envelope tracking signal n2 synchronized with the first signal s 1;
the switch circuit 143, coupled to the linear amplifier 142, is adapted to close the second envelope tracking circuit and input the second envelope tracking signal n2 to the signal combining circuit 15 when the voltage of the second envelope tracking signal n2 is greater than the voltage of the first envelope tracking signal n 1.
Since the linear amplifier 142 operates at a high frequency, the conversion efficiency is higher than that of the DC-DC converter 132, and therefore, the conversion efficiency of the envelope signal s3 at a high frequency can be ensured by envelope tracking the high frequency portion of the envelope signal s3 by the linear amplifier 142.
In a specific implementation, the switch circuit 143 may have various circuit structures, for example, the switch circuit 143 may be a diode, and the anode of the diode is coupled to the linear amplifier 142 and the cathode of the diode is coupled to the signal combining circuit 15.
As the operating frequency increases, the conversion efficiency of the DC-DC converter 132 gradually decreases, and the voltage of the first envelope tracking signal n1 also decreases. When the voltage of the second envelope tracking signal n2 is greater than the voltage of the first envelope tracking signal n1, the diode 143 is turned on, and the bias voltage is provided for the rf power amplifier 16 by the voltage of the second envelope tracking signal n2 in combination with the first envelope tracking signal n1, so that the operating efficiency of the rf power amplifier 16 is the highest.
When the operating frequency is low, the conversion efficiency of the DC-DC converter 132 is high, and the voltage of the first envelope tracking signal n1 is generally higher than the voltage of the second envelope tracking signal n 2. At this time, the diode 143 is turned off, and the bias voltage is provided to the rf power amplifier 16 by the first envelope tracking signal n1 alone. The DC-DC converter 132 can maximize the operating efficiency of the rf power amplifier 16 due to its high conversion efficiency at low frequencies.
In a specific implementation, in order to ensure that the rf power amplifier 16 can normally operate, a clamping circuit 17 may be disposed between the signal combining circuit 15 and the rf power amplifier 16, and the clamping circuit 17 clamps the voltage of the bias voltage providing signal p1, which is the output signal of the signal combining circuit 15, so that the voltage of the bias voltage providing signal p1 is between the supply voltage of the rf power amplifier 16 and the minimum operating voltage, and the rf power amplifier 16 is prevented from being damaged due to an excessive voltage of the bias voltage providing signal p 1.
In an implementation, when the first frequency f1 and the second frequency f2 are equal, the first frequency f1 and the second frequency f2 may be determined according to the conversion efficiency of the DC-DC converter 132. In general, in order to ensure the maximum operating efficiency of the rf power amplifier 16, frequencies corresponding to the conversion efficiency of the DC-DC converter 132 being seventy percent of the maximum conversion efficiency may be used as the first frequency f1 and the second frequency f 2. Of course, other frequency values may be set as the first frequency f1 and the second frequency f2, and are specifically selected according to the actual conditions of the first envelope tracking circuit 13 and the second envelope tracking circuit 14.
In an embodiment of the present invention, referring to fig. 3, in order to synchronize the first envelope tracking signal n1, the second envelope tracking signal n2 and the first signal s1, the rf transmitting circuit 1 may further include: a delay processing unit adapted to delay at least two of the first envelope tracking signal n1, the second envelope tracking signal n2, and the first signal s1 such that the first envelope tracking signal, the second envelope tracking signal, and the first signal are synchronized.
In a specific implementation, the delay processing unit may include at least two of the first delay unit 181, the second delay unit 182, and the third delay unit 183. The first delay unit 181 is coupled between the DC-DC converter 132 and the signal combining circuit 15, and is adapted to delay the first envelope tracking signal n1 output by the DC-DC converter 132. The second delay unit 182 is coupled between the linear amplifier 142 and the switch circuit 143, and is adapted to delay the second envelope tracking signal n2 output from the linear amplifier 142. The third delay 183 is coupled between the input directional coupler 11 and the rf power amplifier 16, and is adapted to delay the first signal s 1.
In a specific implementation, the delay processing unit may only include any two of the first delay unit 181, the second delay unit 182, and the third delay unit 183, or may simultaneously include the first delay unit 181, the second delay unit 182, and the third delay unit 183. How to set up the delay is can be selected according to the delay conditions among the first envelope tracking signal n1, the second envelope tracking signal n2 and the first signal s 1.
For example, when the delay processing unit only includes the first delay unit 181 and the second delay unit 182, the first envelope tracking signal n1 is delayed by the first delay unit 181 so that the first envelope tracking signal n1 is synchronized with the first signal s1, and the second envelope tracking signal n2 is delayed by the second delay unit 182 so that the second envelope tracking signal n2 is synchronized with the first signal s 1.
For another example, the delay processing unit may include only the first delay unit 181 and the third delay unit 183, the first envelope tracking signal n1 is delayed by the first delay unit 181 so that the first envelope tracking signal n1 is synchronized with the second envelope tracking signal n2, and the first signal s1 is delayed by the third delay unit 183 so that the first signal s1 is synchronized with the second envelope tracking signal n 2.
The embodiment of the present invention further provides a radio frequency transmitter, which may include any one of the radio frequency transmitting circuits 1 described above. And processing the signal to be transmitted by using the radio frequency transmitting circuit 1 and outputting the processed signal to an antenna.
The embodiment of the invention also provides a user terminal, which can comprise the radio frequency transmitter in the embodiment. The user terminal may communicate with a base station or other devices using the radio frequency transmitter.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (11)
1. A radio frequency transmission circuit, comprising: input direction coupler, envelope detection circuit, first envelope tracking circuit, second envelope tracking circuit, signal merging circuit and radio frequency power amplifier, wherein:
the input directional coupler is coupled with the envelope detection circuit and the radio frequency power amplifier and is suitable for separating a signal to be transmitted into a first signal and a second signal, wherein the first signal is a signal suitable for being transmitted by the radio frequency power amplifier, and the second signal is a signal suitable for providing an envelope signal;
the envelope detection circuit, coupled to the first and second envelope tracking circuits, is adapted to separate the envelope signal from the second signal;
the first envelope tracking circuit is coupled with the signal merging circuit and is suitable for carrying out envelope tracking on a low-frequency part of the envelope signal, the frequency of which is less than a first frequency, so as to generate a first envelope tracking signal which is synchronous with the first signal;
the second envelope tracking circuit is coupled with the signal merging circuit and is suitable for carrying out envelope tracking on a high-frequency part of the envelope signal, the frequency of which is greater than a second frequency, so as to generate a second envelope tracking signal which is synchronous with the first signal, wherein the first frequency is less than or equal to the second frequency;
the signal combination circuit is coupled with the radio frequency power amplifier and is suitable for combining the first envelope tracking signal and the second envelope tracking signal to generate a bias voltage supply signal;
the radio frequency power amplifier is suitable for outputting the second signal after amplifying the voltage of the signal provided by the bias voltage as the bias voltage;
when the voltage of the first envelope tracking signal is higher than the voltage of the second envelope tracking signal, the signal combination circuit provides the first envelope tracking signal as the bias voltage; when the voltage of the first envelope tracking signal is smaller than the voltage of the second envelope tracking signal, the signal combination circuit takes the signal obtained by combining the first envelope tracking signal and the second envelope tracking signal as the bias voltage supply signal.
2. The radio frequency transmit circuit of claim 1, wherein the first envelope tracking circuit comprises: a low pass filter, and a DC-DC converter, wherein:
the low-pass filter is coupled with the envelope detection circuit and is suitable for performing low-pass filtering on the envelope signal to obtain a low-frequency part of the envelope signal, wherein the frequency of the low-frequency part is less than a first frequency;
the DC-DC converter, which is adapted to be coupled to the low pass filter, is adapted to perform envelope tracking on a low frequency portion of the envelope signal having a frequency smaller than a first frequency, resulting in a first envelope tracking signal synchronized with the first signal.
3. The radio frequency transmission circuit according to claim 2, wherein the DC-DC converter is a step-up and step-down type DC-DC converter.
4. The radio frequency transmit circuit of claim 2, wherein the second envelope tracking circuit comprises: a high pass filter, a linear amplifier, and a switching circuit, wherein:
the high-pass filter is coupled with the envelope detection circuit and is suitable for carrying out high-pass filtering on the envelope signal to obtain a high-frequency part of the envelope signal, wherein the frequency of the high-frequency part is greater than a second frequency;
the linear amplifier is coupled with the high-pass filter and is suitable for carrying out envelope tracking on a high-frequency part of the envelope signal, the frequency of which is greater than a second frequency, so as to obtain a second envelope tracking signal which is synchronous with the first signal;
the switch circuit is coupled with the linear amplifier and is suitable for closing the second envelope tracking circuit and inputting the second envelope tracking signal to the signal combination circuit when the voltage of the second envelope tracking signal is greater than that of the first envelope tracking signal.
5. The radio frequency transmission circuit according to claim 4, wherein when the first frequency is equal to the second frequency, the first frequency and the second frequency are frequencies corresponding to a conversion efficiency of the DC-DC converter being seventy percent of a maximum conversion efficiency.
6. The radio frequency transmit circuit of claim 4, wherein the switching circuit is a diode having an anode coupled to the linear amplifier and a cathode coupled to the signal combining circuit.
7. The radio frequency transmit circuit of claim 4, wherein the radio frequency transmit circuit further comprises: and the delay processing unit is suitable for performing delay processing on at least two of the first envelope tracking signal, the second envelope tracking signal and the first signal so as to synchronize the first envelope tracking signal, the second envelope tracking signal and the first signal.
8. The radio frequency transmission circuit according to claim 7, wherein the delay processing unit includes at least two of the following delays:
the first delayer is coupled between the DC-DC converter and the signal merging circuit and is suitable for carrying out time delay processing on a first envelope tracking signal output by the DC-DC converter;
the second delayer is coupled between the linear amplifier and the switch circuit and is suitable for carrying out time delay processing on a second envelope tracking signal output by the linear amplifier;
and the third delayer is coupled between the input direction coupler and the radio frequency power amplifier and is suitable for carrying out time delay processing on the first signal.
9. The radio frequency transmit circuit of claim 1, wherein the radio frequency transmit circuit further comprises: and the clamping circuit is coupled between the signal combining circuit and the radio frequency power amplifier and is suitable for clamping the voltage of the output signal of the signal combining circuit.
10. A radio frequency transmitter comprising the radio frequency transmission circuit as claimed in any one of claims 1 to 9.
11. A user terminal comprising the radio frequency transmitter of claim 10.
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| CN201611185845.8A CN108206703B (en) | 2016-12-20 | 2016-12-20 | Radio frequency transmitting circuit, transmitter and user terminal |
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| CN105811893A (en) * | 2016-04-20 | 2016-07-27 | 广东工业大学 | Circuit structure of envelope tracking radio frequency power amplifier |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| GB2511733B (en) * | 2013-02-01 | 2020-08-19 | Snaptrack Inc | 2G support for 2G and 3G/4G envelope tracking modulator |
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| CN104185953A (en) * | 2012-02-09 | 2014-12-03 | 天工方案公司 | Apparatus and methods for envelope tracking |
| CN105210289A (en) * | 2012-11-14 | 2015-12-30 | 谷歌技术控股有限责任公司 | Supply transitions in an envelope tracked power amplifier |
| CN105103441A (en) * | 2013-02-01 | 2015-11-25 | 追踪有限公司 | Improved efficiency for linear amplifier of envelope tracking modulator |
| CN103518322A (en) * | 2013-03-26 | 2014-01-15 | 华为技术有限公司 | Digital envelope signal amplification circuit, method and envelope tracking power amplifier |
| WO2015182962A1 (en) * | 2014-05-28 | 2015-12-03 | Samsung Electronics Co., Ltd. | Apparatus and method for removing noise of power amplifier in mobile communication system |
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