A frequency source generating device

Abstract

The present application relates to the technical field of frequency source device, especially to a frequency source generating device, the device comprises: reference signal input end; three power dividers, including first output end, second output end and third output end, the reference signal is divided into: first path signal, second path signal and third path signal; mixing unit, including: frequency multiplier, connecting the first output end; frequency divider, connecting the second output end; first frequency mixer, connecting the frequency multiplier output end; second frequency mixer, connecting the frequency divider output end, the first frequency mixer output end connects the second frequency mixer input end; phase-locked loop, including first input end, second input end, fourth output end, fifth output end, the first input end, fourth output end are connected with mixing unit, the second input end connects the third output end; the feedback signal of fourth output end is handled by phase-locked loop after the frequency mixing processing of mixing unit, and the first target frequency signal is output from the fifth output end; the miniaturization of low noise frequency source is realized.

Description

Technical Field

[0001] This invention relates to the field of frequency source device technology, and more particularly to a frequency source generating device. Background Technology

[0002] Existing low-noise frequency sources mostly use harmonic mixing circuits and switching filter circuits. However, due to the relatively large size of harmonic mixing circuits and switching filter circuits, it is impossible to miniaturize low-noise frequency sources.

[0003] Therefore, how to reduce the size of low-noise frequency sources is a technical problem that urgently needs to be solved. Summary of the Invention

[0004] In view of the above problems, the present invention is proposed to provide a frequency source generating apparatus that overcomes or at least partially solves the above problems.

[0005] This invention provides a frequency source generator, comprising:

[0006] The reference signal input terminal is used to input a reference signal of a preset frequency;

[0007] A three-way power divider is connected to the reference signal input terminal, and the three-way power divider includes a first output terminal, a second output terminal, and a third output terminal. The three-way power divider is used to divide the reference signal into three signals, and the three signals include: a first signal, a second signal, and a third signal.

[0008] A mixing unit includes: a frequency multiplier connected to a first output terminal for multiplying a first signal to obtain a first output signal; a frequency divider connected to a second output terminal for dividing a second signal to obtain a second output signal; a first mixer connected to the output terminal of the frequency multiplier; and a second mixer connected to the output terminal of the frequency divider, wherein the output terminal of the first mixer is connected to the input terminal of the second mixer.

[0009] A phase-locked loop (PLL) includes a first input terminal, a second input terminal, a fourth output terminal, and a fifth output terminal. The first input terminal is connected to the mixer unit, the second input terminal is connected to the third output terminal, and the fourth output terminal is connected to the mixer unit for outputting a feedback signal.

[0010] The feedback signal from the fourth output terminal is mixed by the mixing unit, processed by the phase-locked loop, and then output as the first target frequency signal from the fifth output terminal.

[0011] Furthermore, the fourth output terminal of the phase-locked loop is connected to the input terminal of the first mixer, and the output terminal of the second mixer is connected to the first input terminal.

[0012] Furthermore, it also includes a band-stop filter connected between the first input terminal and the second mixer output terminal.

[0013] Furthermore, the phase-locked loop includes:

[0014] The phase detector, low-pass filter, voltage-controlled oscillator, and coupler are connected in sequence.

[0015] The phase detector has an N-division terminal as the first input terminal, an R-division terminal as the second input terminal, a coupling terminal as the fourth output terminal, and a through terminal as the fifth output terminal.

[0016] Furthermore, it also includes:

[0017] The anti-reverse crosstalk unit includes a first amplifier, an attenuator, and a second amplifier connected in sequence, and the anti-reverse crosstalk unit is connected between the fourth output terminal and the first mixer input terminal.

[0018] Furthermore, it also includes:

[0019] The control unit is used to control the first output signal output by the frequency multiplier and the feedback signal output by the fourth output terminal of the phase-locked loop according to the first target frequency signal, and to output the second target frequency signal after the second mixing by adjusting the division factor of the frequency divider.

[0020] Furthermore, the frequency multiplier, the frequency divider, the first target frequency of the first target frequency signal, the second target frequency of the second target frequency signal, and the preset frequency of the reference signal satisfy a preset relationship:

[0021] N1=f0 / (|f T -N2*f0|-50)

[0022] Where N1 is the division factor of the frequency divider, N2 is the multiplication factor of the frequency multiplier, f0 is the preset frequency of the reference signal, and f T 50 is the first target frequency of the first target frequency signal, and 50 is the second target frequency of the second target frequency signal.

[0023] Furthermore, when the first target frequency of the first target frequency signal is 4 to 8 GHz, the multiplier of the frequency multiplier is any value between 1 and 3.

[0024] One or more technical solutions in the embodiments of the present invention have at least the following technical effects or advantages:

[0025] This invention provides a frequency source generating device, comprising: a reference signal input terminal for inputting a reference signal of a preset frequency; a power divider connected to the reference signal input terminal, the power divider including a first output terminal, a second output terminal, and a third output terminal, the power divider being used to divide the reference signal into three signals, the three signals including: a first signal, a second signal, and a third signal; and a mixing unit, comprising: a frequency multiplier connected to the first output terminal for multiplying the first signal to obtain a first output signal; and a frequency divider connected to the second output terminal for dividing the second signal to obtain a second output signal; and a third frequency divider. A first mixer is connected to the output of a frequency multiplier; a second mixer is connected to the output of a frequency divider; the output of the first mixer is connected to the input of the second mixer; a phase-locked loop (PLL) includes a first input, a second input, a fourth output, and a fifth output. The first input is connected to a mixing unit, the second input is connected to a third output, and the fourth output is connected to the mixing unit to output a feedback signal. The feedback signal from the fourth output is mixed by the mixing unit, then processed by the PLL, and a first target frequency signal is output from the fifth output. By using a frequency multiplier and a frequency divider to replace the original harmonic mixing circuit and switching filter circuit, the miniaturization of the low-noise frequency source is achieved. Attached Figure Description

[0026] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0027] Figure 1 A schematic diagram of the frequency source signal generator in an embodiment of the present invention is shown;

[0028] Figure 2 A schematic diagram of the specific structure of the frequency signal generating device in an embodiment of the present invention is shown;

[0029] Figure 3 A schematic diagram illustrating the simulation of the signal from the frequency source signal generator in an embodiment of the present invention is shown. Detailed Implementation

[0030] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present 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 the disclosure to those skilled in the art.

[0031] Embodiments of the present invention provide a frequency source generating device, such as... Figure 1 As shown, it includes:

[0032] Reference signal input terminal 101 is used to input a reference signal of a preset frequency;

[0033] The three-way power divider 102 is connected to the reference signal input terminal 101, and the three-way power divider 102 includes a first output terminal OUT1, a second output terminal OUT2 and a third input terminal. The three-way power divider is used to divide the reference signal into three signals, which include: a first signal, a second signal and a third signal.

[0034] The mixing unit 103 includes: a frequency multiplier 1031 connected to a first output terminal OUT1, used to multiply the frequency of a first signal to obtain a first output signal; a frequency divider 1032 connected to a second output terminal OUT2, used to divide the frequency of a second signal to obtain a second output signal; a first mixer 1033 connected between a fourth output terminal OUT4 and the output terminal of the frequency multiplier 1031; and a second mixer 1034 connected between the output terminal of the first mixer 1033 and the output terminal of the frequency divider 1032.

[0035] Phase-locked loop 104 includes a first input terminal N, a second input terminal R, a fourth output terminal OUT4, and a fifth output terminal OUT5. The first input terminal N is connected to the mixer unit 103, the second input terminal R is connected to the third output terminal OUT3, and the fourth output terminal OUT4 is connected to the mixer unit 103 for outputting feedback signals.

[0036] The feedback signal from the fourth output terminal OUT4 is processed by the mixing unit 103, then processed by the phase-locked loop 104, and the first target frequency signal is output from the fifth output terminal OUT5.

[0037] In a specific implementation, the fourth output terminal OUT4 of the phase-locked loop 104 is connected to the input terminal of the first mixer 1033, and the output terminal of the second mixer 1034 is connected to the first input terminal OUT1, thereby realizing closed-loop control of the phase-locked loop 104.

[0038] The frequency source generating device further includes a control unit, which controls the first output signal output by the frequency multiplier 1031 and the feedback signal output by the fourth output terminal OUT4 of the phase-locked loop 104 according to the target frequency signal, and controls the output of the second target frequency signal after the second mixing by the second mixer 1034 by adjusting the division factor of the frequency divider 1032. The second target frequency signal has a second target frequency of 50MHz.

[0039] In specific implementation methods, such as Figure 2As shown, the frequency source generating device includes a band-stop filter 105 connected between the first input terminal OUT1 and the output terminal of the second mixer 1034, used to reduce the spurious intensity of the second target frequency signal output after the second mixing, so as to improve the strength of the useful signal.

[0040] Next, the second target frequency signal enters the phase-locked loop 104, which includes a phase detector 1041, a low-pass filter 1042, a voltage-controlled oscillator 1043, and a coupler 1044 connected in sequence. The N-division terminal of the phase detector 1041 serves as the first input terminal N, the R-division terminal serves as the second input terminal R, the coupling terminal of the coupler 1044 serves as the fourth output terminal OUT4, and the through terminal serves as the fifth output terminal OUT5.

[0041] After the second target frequency signal passes through the first input terminal N of the phase-locked loop 104, a 50NHz phase detection signal is output. This phase detection signal is compared with the reference signal input at the second input terminal OUT2. The phase error signal is output from the CP terminal of the phase detector 1041 to the low-pass filter 1042. After being filtered by the low-pass filter 1042, the control voltage of the voltage-controlled oscillator 1043 is formed. The feedback signal is fed back to the phase detector 1041 through the coupler 1044. During the feedback process, the signal is mixed by the mixing unit 103.

[0042] In an optional embodiment, to prevent the mixed signal from backtracking onto the first target frequency signal, the frequency source generating device further includes an anti-backtracking unit 106, which includes a first amplifier 1061, an attenuator 1062, and a second amplifier 1063 connected in sequence. The anti-backtracking unit 106 is connected between the fourth output terminal OUT4 and the input terminal of the first mixer 1033, thereby improving the spurious emissions of the frequency source.

[0043] In order for the signal source generator to output the first target frequency signal, the multiplication factor of the frequency multiplier 1031, the division factor of the frequency divider 1032, and the second target frequency of the second target frequency signal need to be set, so that the signal source generator can output the first target frequency signal.

[0044] Specifically, the multiplication factor of the frequency multiplier 1031, the division factor of the frequency divider 1032, the first target frequency of the first target frequency signal, the second target frequency of the second target frequency signal, and the preset frequency of the reference signal satisfy a preset relationship:

[0045] N1=f0 / (|f T -N2*f0|-50)

[0046] Where N1 is the division factor of frequency divider 1032, N2 is the multiplication factor of frequency multiplier 1031, f0 is the preset frequency of reference signal, and f T 50 is the first target frequency of the first target frequency signal, and 50 is the second target frequency of the second target frequency signal.

[0047] In a specific implementation, if the first target frequency of the first target frequency signal is 4 to 5.6 GHz, the multiplier 1031 has a multiplication factor of 1; if the first target frequency of the first target frequency signal is 5.6 to 7.2 GHz, the multiplier has a multiplication factor of 2; and if the first target frequency of the first target frequency signal is 7.2 to 8 GHz, the multiplier has a multiplication factor of 3.

[0048] Specifically, when the multiplier 1031 has a multiplier of 1, the frequency of the signal output by the multiplier 1031 is 4.8 GHz; when the multiplier 1031 has a multiplier of 2, the frequency of the signal output by the multiplier 1031 is 6.4 GHz; and when the multiplier 1031 has a multiplier of 3, the frequency of the signal output by the multiplier 1031 is 8 GHz. The frequency of the signal obtained after the first mixing is between 50 MHz and 800 MHz.

[0049] Next, after the second mixing, the second target frequency signal is output, which is a fixed 50MHz.

[0050] Then, after processing by the phase-locked loop 104, the first target frequency signal, i.e., 4 to 8 GHz, is finally output from the fifth output terminal OUT5. Specifically, when the frequency of the signal output by the frequency multiplier 1031 is 4.8 GHz, the fifth output terminal OUT5 outputs a signal of 4 to 5.6 GHz; when the frequency of the signal output by the frequency multiplier 1031 is 6.4 GHz, the fifth output terminal OUT5 outputs a signal of 5.6 to 7.2 GHz; and when the frequency of the signal output by the frequency multiplier 1031 is 8 GHz, the fifth output terminal OUT5 outputs a signal of 7.2 to 8 GHz.

[0051] Of course, the first target frequency signal can be set arbitrarily, which will not be described in detail in this embodiment of the invention.

[0052] With a reference signal of 1.6 GHz, the phase noise is 140 dBc / Hz@1 kHz. Theoretical calculations show that the phase noise at an output of 8 GHz is approximately -126 dBc / Hz@1 kHz. The simulation results are as follows: Figure 3 As shown in the figure. Simulation results show that at an output frequency of 8 GHz, the phase noise is -125.83 dBc / Hz@1 kHz, reaching the theoretical limit of phase noise.

[0053] One or more technical solutions in the embodiments of the present invention have at least the following technical effects or advantages:

[0054] This invention provides a frequency source generating device, comprising: a reference signal input terminal for inputting a reference signal of a preset frequency; a power divider connected to the reference signal input terminal, the power divider including a first output terminal, a second output terminal, and a third output terminal, the power divider being used to divide the reference signal into three signals, the three signals including: a first signal, a second signal, and a third signal; and a mixing unit, comprising: a frequency multiplier connected to the first output terminal for multiplying the first signal to obtain a first output signal; and a frequency divider connected to the second output terminal for dividing the second signal to obtain a second output signal; and a third frequency divider. A first mixer is connected to the output of a frequency multiplier; a second mixer is connected to the output of a frequency divider; the output of the first mixer is connected to the input of the second mixer; a phase-locked loop (PLL) includes a first input, a second input, a fourth output, and a fifth output. The first input is connected to a mixing unit, the second input is connected to a third output, and the fourth output is connected to the mixing unit to output a feedback signal. The feedback signal from the fourth output is mixed by the mixing unit, then processed by the PLL, and a first target frequency signal is output from the fifth output. By using a frequency multiplier and a frequency divider to replace the original harmonic mixing circuit and switching filter circuit, the miniaturization of the low-noise frequency source is achieved.

[0055] Although preferred embodiments of the invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including both the preferred embodiments and all changes and modifications falling within the scope of the invention.

[0056] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A frequency source generating device, characterized in that, include: The reference signal input terminal is used to input a reference signal of a preset frequency; A three-way power divider is connected to the reference signal input terminal, and the three-way power divider includes a first output terminal, a second output terminal, and a third output terminal. The three-way power divider is used to divide the reference signal into three signals, and the three signals include: a first signal, a second signal, and a third signal. A mixing unit includes: a frequency multiplier connected to a first output terminal for multiplying a first signal to obtain a first output signal; a frequency divider connected to a second output terminal for dividing a second signal to obtain a second output signal; a first mixer connected to the output terminal of the frequency multiplier; and a second mixer connected to the output terminal of the frequency divider, wherein the output terminal of the first mixer is connected to the input terminal of the second mixer. A phase-locked loop (PLL) includes a first input terminal, a second input terminal, a fourth output terminal, and a fifth output terminal. The first input terminal is connected to the mixer unit, the second input terminal is connected to the third output terminal, and the fourth output terminal is connected to the mixer unit for outputting a feedback signal. The feedback signal from the fourth output terminal is mixed by the mixing unit, processed by the phase-locked loop, and then output from the fifth output terminal as the first target frequency signal. The fourth output terminal of the phase-locked loop is connected to the input terminal of the first mixer, and the output terminal of the second mixer is connected to the first input terminal.

2. The frequency source generating device as described in claim 1, characterized in that, Also includes: A band-stop filter is connected between the first input terminal and the second mixer output terminal.

3. The frequency source generating device as described in claim 1, characterized in that, The phase-locked loop includes: The phase detector, low-pass filter, voltage-controlled oscillator, and coupler are connected in sequence. The phase detector has an N-division terminal as the first input terminal, an R-division terminal as the second input terminal, a coupling terminal as the fourth output terminal, and a through terminal as the fifth output terminal.

4. The frequency source generating device as described in claim 1, characterized in that, Also includes: The anti-reverse crosstalk unit includes a first amplifier, an attenuator, and a second amplifier connected in sequence, and the anti-reverse crosstalk unit is connected between the fourth output terminal and the first mixer input terminal.

5. The frequency source generating device as described in claim 1, characterized in that, Also includes: The control unit is used to control the first output signal output by the frequency multiplier and the feedback signal output by the fourth output terminal of the phase-locked loop according to the first target frequency signal, and to output the second target frequency signal after the second mixing by adjusting the division factor of the frequency divider.

6. The frequency source generating device as described in claim 1, characterized in that, The frequency multiplier, the frequency divider, the first target frequency of the first target frequency signal, the second target frequency of the second target frequency signal, and the preset frequency of the reference signal satisfy a preset relationship: ； in, The division ratio of the frequency divider. The multiplier is the frequency multiplier. The preset frequency for the reference signal, 50 is the first target frequency of the first target frequency signal, and 50 is the second target frequency of the second target frequency signal.

7. The frequency source generating apparatus as described in claim 6, characterized in that, When the first target frequency of the first target frequency signal is 4~5.6GHz, the multiplier is 1; When the first target frequency of the first target frequency signal is 5.6~7.2GHz, the multiplier is 2; When the first target frequency of the first target frequency signal is 7.2~8GHz, the multiplier is 3.

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