Envelope tracking device and radio frequency signal correction method

Abstract

The present disclosure discloses an envelope tracking device, comprising: an arbitrary waveform generator, an envelope tracker, a sampling module, a radio frequency signal generator, a correction module and a radio frequency power amplifier, wherein the envelope tracker is configured to perform envelope tracking on an arbitrary waveform signal sent by the arbitrary waveform generator to output an envelope tracking signal; the sampling module is configured to sample the envelope tracking signal output by the envelope tracker to obtain a sampling signal; the correction module is configured to perform delay correction on a radio frequency signal to be sent by the radio frequency signal generator based on the sampling signal to obtain a delay-corrected radio frequency signal, and the delay-corrected radio frequency signal is coupled with the envelope tracking signal output by the envelope tracker at the radio frequency power amplifier. The present disclosure also discloses a radio frequency signal correction method. The present disclosure synchronizes the timing of the radio frequency signal and the envelope tracking signal by performing timing delay on the radio frequency signal based on the envelope tracking signal.

Description

Technical Field

[0001] This disclosure belongs to the field of signal processing, specifically relating to an envelope tracking device and a radio frequency signal correction method. Background Technology

[0002] In existing envelope tracking devices, because the envelope tracker needs to filter the waveform signal sent by the arbitrary waveform generator, its output envelope tracking signal lags behind the RF signal sent by the RF signal generator at the coupling point of the RF power amplifier. The envelope tracking signal can dynamically adjust the voltage applied to the RF power amplifier. The peak efficiency and peak output power of the RF power amplifier change with the supply voltage. If the envelope tracking signal lags behind the RF signal sent by the RF signal generator, it will cause distortion in the output signal of the RF power amplifier, thereby degrading the output power and linearity of the RF power amplifier.

[0003] Furthermore, because the envelope tracking signal output by the envelope tracker lags behind the RF signal sent by the RF signal generator at the coupling point of the RF power amplifier, the output power and linearity of the RF power amplifier decrease. This makes it difficult for existing envelope tracking devices to achieve optimal operating efficiency. Only when the envelope tracking signal and the RF signal are synchronized can the distortion of the RF power amplifier's output signal be avoided, and the output power and linearity of the RF power amplifier be improved, thereby enabling the envelope tracking device to achieve optimal operating efficiency. Summary of the Invention

[0004] To address the shortcomings of existing technologies, the present disclosure aims to provide an envelope tracking device that can calibrate the radio frequency signal to be transmitted from the radio frequency signal generator to the radio frequency power amplifier, synchronizing it with the envelope tracking signal output by the envelope tracker, thereby improving the output power and linearity of the radio frequency power amplifier and optimizing the working efficiency of existing envelope tracking devices.

[0005] To achieve the above objectives, this disclosure provides the following technical solutions:

[0006] An envelope tracking device includes: an arbitrary waveform generator, an envelope tracker, a sampling module, a radio frequency signal generator, a correction module, and a radio frequency power amplifier, wherein...

[0007] The arbitrary waveform generator is connected to the envelope tracker, and the envelope tracker is used to perform envelope tracking on the arbitrary waveform signal sent by the arbitrary waveform generator to output an envelope tracking signal.

[0008] The sampling module is connected to the envelope tracker, and the sampling module is used to sample the envelope tracking signal output by the envelope tracker to obtain a sampling signal;

[0009] The correction module is connected to the sampling module and the radio frequency signal generator respectively, and is used to perform delay correction on the radio frequency signal to be transmitted by the radio frequency signal generator based on the sampling signal to obtain the delay-corrected radio frequency signal, and couple it with the envelope tracking signal output by the envelope tracker at the radio frequency power amplifier.

[0010] Preferably, the sampling module includes a signal sampler and a register.

[0011] Preferably, the correction module includes a register and a delay.

[0012] Preferably, the device further includes a measurement module for measuring the envelope tracking signal output by the envelope tracker to obtain the current value of the envelope tracking signal.

[0013] Preferably, the measurement module includes diodes D1 and D2 connected in parallel, and inductors L1 and L2 are connected in parallel between D1 and D2.

[0014] Preferably, the measurement module includes an RC oscillation circuit, which is connected in series with an inductor L.

[0015] Preferably, the measurement module includes a rectifier bridge circuit and an inductor connected in parallel.

[0016] This disclosure also provides a radio frequency signal correction method, including the following steps:

[0017] S100: The sampling module samples the envelope tracking signal output by the envelope tracker to obtain a sampling signal;

[0018] S200: Input the sampled signal into the correction module to perform delay correction on the radio frequency signal input from the radio frequency signal generator and stored in the correction module, so as to obtain the corrected radio frequency signal.

[0019] Compared with the prior art, the beneficial effects of this disclosure are as follows:

[0020] 1. The RF signal is delayed by using a calibration module in conjunction with a register. The peak value of the RF signal is compared with that of the sampled signal obtained from the envelope tracking signal. The peak values ​​of the two signals are calibrated so that the delay of the RF signal is synchronized with the timing of the sampled signal, thus completing the calibration.

[0021] 2. The peak current output of the envelope tracker is detected by the measurement module. Compared with the existing technology that uses a current probe to measure the output current of the envelope tracker online, it is difficult to measure the output current of the envelope tracker online. The power of the envelope tracker and the RF power amplifier can be measured online respectively when they are combined.

[0022] 3. The calibration module, in conjunction with the measurement module, enables direct online measurement and calibration at the input or output of the envelope tracker. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of an envelope tracking device according to an embodiment of this disclosure;

[0024] Figure 2 This is a circuit diagram of a measurement module according to another embodiment of this disclosure;

[0025] Figure 3 This is a circuit diagram of a measurement module according to another embodiment of this disclosure;

[0026] Figure 4 This is a circuit diagram of a measurement module according to another embodiment of this disclosure;

[0027] The markings in the attached diagram are explained as follows:

[0028] 1. Arbitrary waveform generator; 2. Envelope tracker; 3. Measurement module; 4. Sampling module; 5. RF signal generator; 6. Calibration module; 7. RF power amplifier. Detailed Implementation

[0029] The following will refer to the appendix. Figures 1 to 4 Specific embodiments of this disclosure are described in detail. While specific embodiments of this disclosure are shown in the accompanying drawings, it should be understood that this disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of this disclosure to those skilled in the art.

[0030] It should be noted that certain terms are used in the specification and claims to refer to specific components. Those skilled in the art will understand that different terms may be used to refer to the same component. This specification and claims do not distinguish components based on differences in terminology, but rather on differences in function. The terms "comprising" or "including" used throughout the specification and claims are open-ended and should be interpreted as "comprising but not limited to." The following descriptions are preferred embodiments for carrying out this disclosure; however, these descriptions are for the purpose of understanding the general principles of the specification and are not intended to limit the scope of this disclosure. The scope of protection of this disclosure is determined by the appended claims.

[0031] To facilitate understanding of the embodiments of this disclosure, further explanations and descriptions will be provided below with reference to the accompanying drawings and specific embodiments. The accompanying drawings do not constitute a limitation on the embodiments of this disclosure.

[0032] In one embodiment, such as Figure 1 As shown, this disclosure provides an envelope tracking device, including: an arbitrary waveform generator, an envelope tracker, a sampling module, an RF signal generator, a correction module, and an RF power amplifier, wherein...

[0033] The arbitrary waveform generator is connected to the envelope tracker, and the envelope tracker is used to perform envelope tracking on the arbitrary waveform signal sent by the arbitrary waveform generator to output an envelope tracking signal.

[0034] The sampling module is connected to the envelope tracker, and the sampling module is used to sample the envelope tracking signal output by the envelope tracker to obtain a sampling signal;

[0035] The correction module is connected to the sampling module and the radio frequency signal generator respectively, and is used to perform delay correction on the radio frequency signal to be transmitted by the radio frequency signal generator based on the sampling signal to obtain the delay-corrected radio frequency signal, and couple it with the envelope tracking signal output by the envelope tracker at the radio frequency power amplifier.

[0036] I understand; once coupled, a signal can be emitted.

[0037] In another embodiment, the sampling module includes a signal sampler and a register.

[0038] In this embodiment, the signal sampler is connected to the measurement module to continuously sample the envelope tracking signal flowing through the measurement module to obtain a sampled signal, and then the sampled signal is stored in a register.

[0039] In another embodiment, the correction module includes a register and a delay.

[0040] In this embodiment, the register in the calibration module stores the radio frequency (RF) signal to be transmitted sent by the RF signal generator, and the sampled signal output from the sampling module is also stored in the register after entering the calibration module. Furthermore, this embodiment also includes a delay unit in the calibration module. By adjusting the delay time of the delay unit, the peak values ​​of the sampled signal and the RF signal to be transmitted stored in the register are calibrated, thus delaying the transmission timing of the RF signal to be transmitted and synchronizing it with the sampling signal timing. Therefore, when the RF signal to be transmitted, synchronized with the sampling signal timing, returns from the calibration module to the RF signal generator and is then output to the RF power amplifier, it is synchronized with the envelope tracking signal sent from the envelope tracker to the RF power amplifier in terms of transmission timing, thereby overcoming the problem of asynchronous transmission between these two signals in existing envelope tracking devices.

[0041] The current signal output by the measurement module is an analog current quantity. After being converted into a digital signal, it is stored in the register of the calibration module via the sampling module. Similarly, the register in the RF signal generator also stores the RF signal emitted by the baseband. The timing of the RF signal is adjusted by the delay of the calibration module to synchronize it with the peak calibration of the current signal output by the measurement module. Finally, the RF signal generator outputs the calibrated RF signal to the RF power amplifier.

[0042] In another embodiment, such as Figure 2 As shown, the measurement module includes diodes D1 and D2 connected in parallel, and inductors L1 and L2 are connected in parallel between D1 and D2.

[0043] In this embodiment, the anode of diode D1 is connected to both the output terminal of the envelope tracker and one side of inductor L1. The cathode of diode D1 is connected to the anode of diode D2 through inductor L2. The cathode of diode D2 is connected to the other side of inductor L1 and then connected to the RF power amplifier.

[0044] The coupling inductor and current-limiting diode do not directly measure the current output by the envelope tracker, but indirectly measure the peak current of the envelope tracker. Specifically, both D1 and D2 have threshold values. When the current exceeds the threshold values ​​of D1 and D2, L2 senses and outputs Iout. When the current is less than the values ​​of D1 and D2, no current flowing through L1 is output. By measuring the current on L2 at the output terminal, the output current of the envelope tracker can be obtained according to the turns ratio of L1 and L2.

[0045] In another embodiment, such as Figure 3 As shown, the measurement module includes an RC oscillation circuit, which is connected in parallel with inductor L1.

[0046] In this embodiment, inductor L1 is connected in parallel with the RC oscillation circuit. The current flowing through inductor L1 is sensed by capacitor C, and the magnitude of the current in the envelope tracking signal output by the envelope tracker can be calculated based on the following formula:

[0047]

[0048]

[0049] Among them, V CX I represents the voltage across the capacitor. L DCR represents the inductor current, and L represents the internal resistance of the inductor. X R represents the inductance. X C represents the resistance value in the oscillating circuit. X The capacitance of the capacitor in the oscillating circuit is represented by , S represents the cross-sectional area of ​​the inductor coil, and Kτ represents the sensing coefficient.

[0050] In another embodiment, such as Figure 4 As shown, the measurement module includes a rectifier bridge circuit and an inductor connected in parallel.

[0051] In this embodiment, the voltage drop generated by the current Io through the inductor is sensed by the voltage across the bridge rectifier. When the output threshold is greater than the peak voltage of the rectifier bridge, Iout represents Io.

[0052] It should be noted that existing methods for measuring the envelope tracking signal current of envelope trackers typically use a current probe. After the current probe measures the current signal, an oscilloscope is needed to analyze the signal to obtain the current value, making real-time online measurement difficult. However, methods such as... Figures 2 to 4 The circuit shown measures the envelope tracking signal without requiring an oscilloscope. After obtaining the envelope tracking signal, the current value can be obtained through simple calculation, thus enabling real-time online measurement of the current signal.

[0053] It should be further noted that the arbitrary waveform generator, envelope tracker, radio frequency signal generator, radio frequency power amplifier, signal sampler and register in the sampling module, and register and delayer in the correction module mentioned above all use existing instruments, and this disclosure does not involve any improvement to the circuit structure of any of the above instruments.

[0054] In another embodiment, this disclosure also provides a radio frequency signal correction method, comprising the following steps:

[0055] S100: The sampling module samples the envelope tracking signal output by the envelope tracker to obtain a sampling signal;

[0056] S200: Input the sampled signal into the correction module to perform delay correction on the radio frequency signal input from the radio frequency signal generator and stored in the correction module, so as to obtain the corrected radio frequency signal.

[0057] While the invention has been described above with reference to exemplary embodiments, the scope of protection of the invention is not limited to the embodiments described above. It will be apparent to those skilled in the art that various changes and modifications in form and detail can be made without departing from the scope and spirit of the invention. The scope of the invention is defined only by the appended claims and their equivalents.

Claims

1. An envelope tracking device, comprising: The system includes an arbitrary waveform generator, an envelope tracker, a sampling module, an RF signal generator, a correction module, and an RF power amplifier. The arbitrary waveform generator is connected to the envelope tracker, and the envelope tracker is used to perform envelope tracking on the arbitrary waveform signal sent by the arbitrary waveform generator to output an envelope tracking signal. The sampling module is connected to the envelope tracker, and the sampling module is used to sample the envelope tracking signal output by the envelope tracker to obtain a sampling signal; The correction module is connected to the sampling module and the radio frequency signal generator respectively, and is used to perform delay correction on the radio frequency signal to be transmitted by the radio frequency signal generator based on the sampling signal to obtain the delay-corrected radio frequency signal, and couple it with the envelope tracking signal output by the envelope tracker at the radio frequency power amplifier; in, The correction module includes a register and a delay; The register in the calibration module stores the radio frequency signal to be transmitted sent by the radio frequency signal generator, and the sampled signal output by the sampling module is also stored in the register after entering the calibration module. By adjusting the delay time of the delay unit to calibrate the peak values ​​of the sampled signal and the radio frequency signal to be transmitted stored in the register, the transmission timing of the radio frequency signal to be transmitted can be delayed, thereby synchronizing with the timing of the sampled signal. Thus, when the radio frequency signal to be transmitted, which is synchronized with the timing of the sampled signal, is returned from the calibration module to the radio frequency signal generator and then output to the radio frequency power amplifier, it can be synchronized with the envelope tracking signal sent to the radio frequency power amplifier by the envelope tracker in terms of transmission timing.

2. The apparatus according to claim 1, wherein, The sampling module includes a signal sampler and a register.

3. The apparatus according to claim 1, wherein, The device also includes a measurement module for measuring the envelope tracking signal output by the envelope tracker to obtain the current value of the envelope tracking signal.

4. The apparatus according to claim 3, wherein, The measurement module includes diodes D1 and D2 connected in parallel, and inductors L1 and L2 are connected in parallel between D1 and D2.

5. The apparatus according to claim 3, wherein, The measurement module includes an RC oscillation circuit, which is connected in parallel with the inductor L.

6. The apparatus according to claim 3, wherein, The measurement module includes a rectifier bridge circuit and an inductor connected in parallel.

7. A radio frequency signal correction method based on the envelope tracking device as described in claim 1, comprising the following steps: S100: The sampling module samples the envelope tracking signal output by the envelope tracker to obtain a sampling signal; S200: Input the sampled signal into the correction module to perform delay correction on the radio frequency signal input from the radio frequency signal generator and stored in the correction module, so as to obtain the corrected radio frequency signal.

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