High-frequency signal generation circuit with switching internal and external references and adjustable multi-channel frequency and power

Abstract

The present invention provides a high-frequency signal generating circuit capable of switching internal and external references and adjusting multiple frequencies and powers, comprising: a control module, a switching module and a processing module; the control module is used for issuing a reference source signal selection; the switching module is used for switching an input mode of an input signal according to a reference source signal selection instruction, the input mode comprising: an external input reference source signal and a reference source signal generated by the circuit itself; the processing module is used for performing frequency synthesis, frequency branching and power amplification on the input signal after determining the external input reference source signal or the reference source signal generated by the circuit itself, so as to obtain multiple high-frequency signals with controllable target sizes, and the processing module can efficiently synthesize signals of different frequencies and generate high-frequency signals with controllable power and adjustable output paths, thereby solving the defect that high-frequency and high-power homologous clock signals in ground high-speed communication are not adjustable.

Description

Technical Field

[0001] The present invention relates to the field of wireless communication technology, and in particular to a high-frequency signal generating circuit capable of switching internal and external references and adjusting multiple frequency and power. Background Art

[0002] In the high-speed waveform simulation system, the high-speed signal generation board mainly generates the coherent system baseband data modulation output, and the high-speed signal acquisition board mainly completes the coherent system baseband data demodulation and decoding functions. When performing synchronous digital processing on the acquired multi-channel analog signals, multiple ADCs need a clock signal from the same source to parse and compare information; when performing high-speed data processing in this system, a high-power clock source signal is required to match the system parameters. However, for the power divider with an output frequency of more than 8Ghz, even if its power can be more than 10dB, it is still impossible to solve the existing problems at the same time from the aspects of access loss, signal strength and quality, number of output channels, internal and external switching, etc. On the other hand, the power divider will drift with the operating temperature and cannot meet the stability requirements of the clock source signal. Therefore, in the high-speed signal processing system, when multiple analog-to-digital modules perform data processing, the clock signal is required to be of the same source and the power must meet the sampling requirements. Otherwise, it will cause many information errors and poor system communication quality.

[0003] In high-speed waveform simulation systems, ADC samples the input signal in each clock cycle to complete the conversion. This sampling process has stricter requirements on the stability and accuracy of the reference clock signal. If a clock signal with lower frequency and power is used, not only will the ADC have larger errors and interference, but the processing module will also be unable to accurately interpret the information contained in the signal. Even if it can be processed, the error of the processed signal information can reach the GHz level. Comprehensive analysis shows that in high-speed waveform simulation systems, the clock frequency synthesis range is required to be above 8Ghz, and the power variation range is required to be around 20dB.

[0004] In the field of high-speed ground communications, electrical signals output by other devices are converted to digital by ADC after passing through the electrical channel, and large-scale FPGA is used to complete data demodulation and decoding. The electrical channel completes signal filtering, amplification and other processing. When the clock signal has a large frequency deviation, on the one hand, it may exceed the bandwidth of the electrical channel, and the signal cannot be completely sampled by the ADC; on the other hand, large frequency deviation and large frequency change rate increase the difficulty of signal transmission.

[0005] Therefore, how to solve the problem of high-frequency, high-power homologous clock signal input and output in terrestrial high-speed communications has become a technical problem that technical personnel in this field urgently need to solve. Summary of the invention

[0006] The present invention provides a high-frequency signal generating circuit with switching internal and external references and adjustable multi-path frequency and power, so as to solve the defects of the high-frequency signal frequency power and the number of output paths in the prior art ground high-speed communication that are not adjustable.

[0007] In a first aspect, the present invention provides a high-frequency signal generating circuit with switching internal and external references and adjustable multi-channel frequency and power, comprising: a control module, a switching module and a processing module;

[0008] The control module is used to issue a reference source signal selection instruction;

[0009] The switching module is used to switch the input mode of the input signal according to the reference source signal selection instruction, and the input mode includes: an external input reference source signal and a reference source signal generated by the circuit itself;

[0010] The processing module is used to perform frequency synthesis, frequency branching and power amplification on the input signal after determining the external input reference source signal or the reference source signal generated by the circuit itself, so as to obtain multiple high-frequency signals with controllable target sizes.

[0011] According to the present invention, a high-frequency signal generating circuit with switching internal and external references and adjustable multi-path frequency and power is provided, wherein the switching module comprises: a clock branching unit, an internal reference unit and an internal and external switching unit;

[0012] The clock splitting unit is used to split one input signal into multiple input signals;

[0013] The internal reference unit is used to output its own frequency when the input signal is absent;

[0014] The internal and external switching unit is used to switch the input mode of the input signal to an external input reference source signal or a reference source signal generated by the circuit itself.

[0015] According to a high-frequency signal generating circuit with switching internal and external references and adjustable multi-channel frequency and power, the processing module includes a frequency synthesis unit, a homologous branch unit and a power amplification unit;

[0016] The frequency synthesis unit is used to perform frequency synthesis on the input signal to generate any frequency signal within a preset frequency range;

[0017] The homologous branching unit is used to perform frequency branching on the frequency signal to obtain multi-channel frequency-divided signals;

[0018] The power amplification unit is used to amplify the multi-channel frequency-divided signals respectively to obtain multi-channel high-frequency signals with controllable target sizes.

[0019] According to a high-frequency signal generating circuit with switching internal and external references and adjustable multi-path frequency and power, the frequency synthesis unit is specifically used for:

[0020] Determine the phase detection frequency and the required output frequency values;

[0021] Based on the relationship between the frequency band range and the frequency division coefficient, determining the output frequency division coefficient according to the frequency value;

[0022] Determining a voltage controlled oscillator frequency based on the frequency value and the frequency division coefficient;

[0023] The voltage-controlled oscillator frequency and the phase-locked frequency are input into a preset formula, and a frequency signal is output.

[0024] According to a high-frequency signal generating circuit with switching internal and external references and adjustable multi-path frequency and power provided by the present invention, the homologous branching unit is specifically used for:

[0025] Receive control module information and select corresponding working mode by configuring register parameters;

[0026] In the working mode, the control module controls the value of CLKx_OUT through SPI to output at least one arbitrary frequency signal;

[0027] When entering the frequency divider mode, the frequency signal is divided based on a preset method to obtain a required signal frequency.

[0028] According to a high-frequency signal generating circuit with switching internal and external references and adjustable multi-channel frequency and power provided by the present invention, the control module is also used for:

[0029] The phase of the frequency signal is adjusted to be consistent with the phase of the reference source signal, and then redundant interference in the frequency signal is removed through loop filtering to generate a clock signal applied to high-speed data processing.

[0030] According to a high-frequency signal generating circuit with switching internal and external references and adjustable multi-channel frequency and power, the multi-channel frequency division signal includes at least one of high output frequency, ultra-low background noise and extremely low skew clock distribution.

[0031] According to a high-frequency signal generating circuit with switching internal and external references and adjustable multi-channel frequency and power provided by the present invention, the preset frequency range is 10 MHz to 15 GHz.

[0032] According to the present invention, a high-frequency signal generating circuit with switching internal and external references and adjustable multi-channel frequency and power is provided, wherein the multi-channel high-frequency signals with controllable target sizes include: four high-frequency signals with the same phase and amplitude, or four high-frequency signals with the same phase but different amplitudes.

[0033] According to a high-frequency signal generating circuit with switching internal and external references and adjustable multi-channel frequency and power provided by the present invention, the power amplification unit amplifies the 5G-20G frequency division signal by a gain of 20dB.

[0034] The present invention provides a high-frequency signal generating circuit capable of switching internal and external references and adjusting multiple frequencies and powers, comprising: a control module, a switching module and a processing module; the control module is used for issuing a reference source signal selection instruction; the switching module is used for switching the input mode of the input signal according to the reference source signal selection instruction, the input mode comprising: an external input reference source signal and a reference source signal generated by the circuit itself; the processing module is used for performing frequency synthesis, frequency branching and power amplification on the input signal after determining the external input reference source signal or the reference source signal generated by the circuit itself, so as to obtain multiple high-frequency signals with controllable target sizes, and the processing module can efficiently synthesize signals of different frequencies and generate high-frequency signals with controllable power and adjustable output paths, thereby solving the defect that large-frequency and large-power homologous clock signals in ground high-speed communications are not adjustable. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0036] Figure 1 It is a schematic diagram of the principle of a high-frequency signal generating circuit with switching internal and external references and adjustable multi-channel frequency and power provided by this embodiment. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] Figure 1 It is a schematic diagram of the principle of a high-frequency signal generating circuit with switching internal and external references and adjustable multi-channel frequency and power provided by this embodiment.

[0039] like Figure 1As shown, an embodiment of the present invention provides a high-frequency signal generating circuit with switching internal and external references and adjustable multi-channel frequency and power, including: a control module 1, a switching module 2 and a processing module 3. Among them, the switching module 2 and the processing module 3 are both connected to the control module 1, the input signal is input through the switching module 2, and the output signal is output after passing through the processing module 3. The control module 1 is used to issue reference source signal selection instructions, signal processing instructions and output instructions; the switching module 2 is used to switch the input mode of the input signal according to the reference source signal selection instruction, and the input mode includes: an external input reference source signal and a reference source signal generated by the circuit itself; the processing module 3 is used to perform frequency synthesis, frequency division and power amplification on the input signal after determining the external input reference source signal or the reference source signal generated by the circuit itself, so as to obtain multi-channel high-frequency signals with controllable target sizes.

[0040] In a specific implementation process, the control module 1 can be controlled by a field programmable gate array (FPGA) processing chip to perform signal control. The control module 1 controls the switching module 2 according to the instruction to select the way the input signal enters the circuit, which includes the reference source signal entering the circuit from the outside and the reference source signal generated by the circuit itself, and selects any one of the ways to input the input signal into the circuit. The external input reference source signal is usually used when there is an external reference source signal, and the reference source signal generated by the circuit itself is usually used when the external reference source fails or is missing.

[0041] Then, after selecting the reference source signal, the signal enters the processing module 3 for frequency synthesis, so that the clock signal can generate any frequency in the range of 10MHz to 15GHz without using an internal doubler. Then the synthesized frequency signal is divided, so that the divided frequency signal of any branch between one and four can be output, where the frequencies of different branches can be the same or different. Finally, the divided signal is power amplified, and the signals of different branches are amplified by different multiples according to the requirements to obtain a high-frequency signal that meets the target requirements. It is also possible to control the power of the four channels separately, and the four channels can output signals with the same phase and amplitude, or signals with the same phase but different amplitudes, so as to meet various technical requirements. Among them, four channels are only exemplary, and other numbers can also be used.

[0042] Due to frequency synthesis, it can be adjusted by frequency doubling method to synthesize clock signals of any frequency between 10Mhz-15Ghz, which can be applied to a variety of intermediate frequency acquisition projects. In addition, multi-channel output can meet most outputs and is suitable for most practical applications. Compared with power division, the clock signal can be processed and monitored by the control module 1 at any time, and can generate a suitable reference clock signal according to different ADC indicators. The clock signal is stable, the waveform is clean and there is no spurious nearby. The noise index is low overall, which can effectively reduce the impact of noise and improve the estimation performance. It is suitable for extremely low signal-to-noise ratio.

[0043] Further, based on the above embodiment, Figure 1 As shown, the switching module 2 in this embodiment includes: a clock branching unit 21, an internal reference unit 23 and an internal-external switching unit 22; the clock branching unit 21 is used to divide one input signal into multiple input signals; the internal reference unit 23 is used to output its own frequency when there is no input signal; the internal-external switching unit 22 is used to switch the input mode of the input signal to an external input reference source signal or a reference source signal generated by the circuit itself.

[0044] Specifically, the clock branch unit 21, the internal reference unit 23 and the internal and external switching unit 22 are all connected to the control module 1, and the clock branch unit 21 and the internal reference unit 23 are all connected to the switching unit. The clock branch unit 21 can merge multiple input signals to obtain one input signal input into the processing module 3. The internal reference unit 23 is mainly used for frequency comparison, and the phase of the frequency signal can be adjusted to be consistent with the reference source signal through the control module 1. The internal and external switching unit 22 mainly switches the reference source signal according to the instruction of the control module 1. Therefore, through the coordinated work of the clock branch unit 21, the internal reference unit 23 and the internal and external switching unit 22, the selection of the reference source signal is effectively realized, and frequency comparison can be performed. By switching the reference source, signal processing in a variety of different situations can also be met.

[0045] Further, based on the above embodiment, Figure 1 As shown, the processing module 3 in this embodiment includes a frequency synthesis unit 31, a homologous branching unit 32 and a power amplification unit 33; the frequency synthesis unit 31 is used to perform frequency synthesis on the input signal to generate any frequency signal within a preset frequency range; the homologous branching unit 32 is used to perform frequency branching on the frequency signal to obtain multi-channel divided frequency signals; the power amplification unit 33 is used to respectively amplify the multi-channel divided frequency signals to obtain multi-channel high-frequency signals with controllable target sizes.

[0046] Specifically, the frequency synthesis unit 31, the homologous branch unit 32 and the power amplification unit 33 are respectively connected to the control module 1, and the control module 1 is sequentially connected to the frequency synthesis unit 31, the homologous branch unit 32 and the power amplification unit 33 to output the signal. When the reference source signal is switched, the signal will enter the frequency synthesis unit 31 for frequency synthesis, and the control module 1 can adjust the phase of the frequency signal to be consistent with the reference source signal, and then remove the redundant interference near the frequency signal through the loop filter circuit. The final generated clock signal can be applied to the high-speed data processing reference clock (JESD204B).

[0047] After the synthesis, the frequency signal enters the homologous branching unit 32 for frequency branching, which can divide one, two, three or four high output frequency, ultra-low background noise (about -160dBc / Hz) and extremely low skew clock distribution (output to output skew 1ps). The device has four high-frequency output clocks and one low-frequency auxiliary clock output. For high-frequency clocks, it supports buffer mode and frequency division mode. The homologous branching unit 32 can distribute multi-channel, low-skew, ultra-low noise local oscillator signals to multiple mixers.

[0048] The divided signal then enters the power amplifier unit 33, which can amplify the gain of about 20dB for 5G-20G signals. The control module 1 adjusts the signal power according to actual needs or actual input signals to achieve the optimal output on the transmission link. It can output four signals with the same phase and amplitude, or signals with the same phase but different amplitudes to meet different actual needs.

[0049] The high-frequency signal generating circuit of the present invention with switching internal and external references and adjustable multi-channel frequency power has the advantage of adjusting the frequency range, can synthesize 10Mhz-15Ghz clock signals, and can be applied to a variety of intermediate frequency acquisition projects. It has the advantage of adjusting the power range, can amplify the power of the clock signal by about 20Db, and can adjust four channels of the same power output at the same time, and can also adjust four channels of different power outputs. It has the advantage of internal and external switching, and can realize the internal and external switching of the reference source signal.

[0050] Furthermore, the specific working process of the frequency synthesis unit in this embodiment is as follows: firstly, the phase detection frequency is set to 1Mhz, and then the required output frequency value is confirmed ( ), match the corresponding frequency range according to the value to obtain the output frequency division coefficient (CHDIV). The relationship between the frequency range and the frequency division coefficient is shown in Table 1. Then, according to formula (1), the voltage-controlled oscillator frequency f is calculated. VCO (Frequency of voltage controlled oscillator) value;

[0051] (1)

[0052] in, Indicates the desired output frequency value, f VCO Represents the voltage-controlled oscillator frequency, and CHDIV represents the frequency division coefficient.

[0053]

[0054] Table 1

[0055] Calculate f VCO Value and phase detection frequency (f PD ) is 1Mh, and then according to the preset formula (2), the value of PLL_N can be calculated. The control module analyzes all the calculation results and configures the above parameters to synthesize the required output frequency (fout).

[0056] (2)

[0057] in, Indicates the VCO frequency division coefficient. When fout enters the homologous branch unit, the branch process is as follows: First, the control module 1 selects the corresponding working mode by configuring the register parameters, enters the buffer mode when CLK_MUX is set to 0, and then enables the channel output when CLKx_EN is set to 1. Finally, the control module 1 controls the value of CLKx_OUT through SPI to output multiple frequency signals. The multiple channels can be at least one of 1-4 channels. CLKx_OUT indicates clock output, CLK_MUX indicates clock output mode switching, CLKx_EN indicates enabling a channel output, CLK_DIV indicates clock division, CLKOUTx_EN indicates enabling a channel, and CLKOUTx_PWR indicates the power of a channel.

[0058] The homologous branch unit 32 also has a frequency division function. When CLK_MUX is set to 1, it enters the frequency divider mode. By controlling CLK_DIV, frequency division can be performed, as shown in Table 2, until the required signal frequency is output.

[0059]

[0060] Table 2

[0061] The power of the divided signal can also be fine-tuned. The control module 1 configures parameters such as CLKOUTx_EN / CLKOUTx_PWR according to Table 3 to achieve the change of signal power from the minimum value to the maximum value.

[0062]

[0063] Table 3

[0064] Through frequency synthesis and frequency splitting, it can synthesize 10Mhz-15Ghz clock signals, and can also adjust four outputs of the same power at the same time, or four outputs of different powers. This effectively solves the problem of high-frequency and high-power homologous clock signals being unadjustable in ground high-speed communications.

[0065] The device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Ordinary technicians in this field can understand and implement it without paying creative labor.

[0066] Through the description of the above implementation methods, those skilled in the art can clearly understand that each implementation method can be implemented by means of software plus a necessary general hardware platform, and of course, can also be implemented by hardware. Based on this understanding, the above technical solution is essentially or the part that contributes to the prior art can be embodied in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a disk, an optical disk, etc., including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or some parts of the embodiments.

[0067] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A high-frequency signal generating circuit with switching internal and external references and adjustable multi-channel frequency and power, characterized in that: include: Control module, switching module and processing module; The control module is used to issue a reference source signal selection instruction; The switching module is used to switch the input mode of the input signal according to the reference source signal selection instruction, and the input mode includes: an external input reference source signal and a reference source signal generated by the circuit itself; The processing module is used to perform frequency synthesis, frequency division and power amplification on the input signal after determining the external input reference source signal or the reference source signal generated by the circuit itself, so as to obtain multiple high-frequency signals with controllable target sizes; The processing module includes a frequency synthesis unit, a homologous branching unit and a power amplification unit; the frequency synthesis unit is used to perform frequency synthesis on the input signal to generate any frequency signal within a preset frequency range; the homologous branching unit is used to perform frequency branching on the frequency signal to obtain multi-channel frequency division signals; the power amplification unit is used to amplify the multi-channel frequency division signals respectively to obtain multi-channel high-frequency signals with controllable target sizes; The frequency synthesis unit is specifically used to: determine the phase-locked frequency and the required output frequency value; determine the output frequency division coefficient according to the frequency value based on the relationship between the frequency range and the frequency division coefficient; determine the voltage-controlled oscillator frequency based on the frequency value and the frequency division coefficient; input the voltage-controlled oscillator frequency and the phase-locked frequency into a preset formula, and output a frequency signal; The homologous branch unit is specifically used for: receiving control module information to select a corresponding working mode by configuring register parameters; in the working mode, the control module controls the value of CLKx_OUT through SPI to output at least one arbitrary frequency signal; when entering the divider mode, the frequency signal is divided based on a preset method to obtain the required signal frequency.

2. The high-frequency signal generating circuit with switching internal and external references and adjustable multi-channel frequency and power according to claim 1, characterized in that: The switching module includes: a clock splitting unit, an internal reference unit and an internal and external switching unit; The clock splitting unit is used to split one input signal into multiple input signals; The internal reference unit is used to output its own frequency when the input signal is absent; The internal and external switching unit is used to switch the input mode of the input signal to an external input reference source signal or a reference source signal generated by the circuit itself.

3. The high-frequency signal generating circuit with switching internal and external references and adjustable multi-channel frequency and power according to claim 1, characterized in that: The control module is also used for: The phase of the frequency signal is adjusted to be consistent with the phase of the reference source signal, and then redundant interference in the frequency signal is removed through loop filtering to generate a clock signal applied to high-speed data processing.

4. The high-frequency signal generating circuit with switching internal and external references and adjustable multi-channel frequency and power according to claim 1, characterized in that: The multi-channel frequency division signal includes at least one of high output frequency, ultra-low background noise and extremely low skew clock distribution.

5. The high-frequency signal generating circuit with switching internal and external references and adjustable multi-channel frequency and power according to any one of claims 1 to 4, characterized in that: The preset frequency range is 10 MHz to 15 GHz.

6. The high-frequency signal generating circuit with switching internal and external references and adjustable multi-channel frequency and power according to any one of claims 1 to 4, characterized in that: The multiple high-frequency signals of which the target sizes are respectively controllable include: four high-frequency signals of the same phase and amplitude, or four high-frequency signals of the same phase and different amplitudes.

7. The high-frequency signal generating circuit with switching internal and external references and adjustable multi-channel frequency and power according to any one of claims 1 to 4, characterized in that: The power amplifier unit amplifies the 5G-20G frequency division signal by a gain of 20dB.

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