CN117318711A - Active hydrogen Zhong Maize signal detection system based on ultra-narrow band phase-locked loop - Google Patents
Active hydrogen Zhong Maize signal detection system based on ultra-narrow band phase-locked loop Download PDFInfo
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- CN117318711A CN117318711A CN202311241319.9A CN202311241319A CN117318711A CN 117318711 A CN117318711 A CN 117318711A CN 202311241319 A CN202311241319 A CN 202311241319A CN 117318711 A CN117318711 A CN 117318711A
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- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 title claims abstract description 47
- 229910052739 hydrogen Inorganic materials 0.000 title claims abstract description 47
- 239000001257 hydrogen Substances 0.000 title claims abstract description 47
- 238000001514 detection method Methods 0.000 title claims abstract description 14
- 239000013078 crystal Substances 0.000 claims description 44
- 238000002156 mixing Methods 0.000 claims description 34
- 230000010355 oscillation Effects 0.000 claims description 10
- 238000001914 filtration Methods 0.000 claims description 6
- 238000013461 design Methods 0.000 claims description 5
- 230000003321 amplification Effects 0.000 claims description 3
- 230000008859 change Effects 0.000 claims description 3
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 3
- 238000001228 spectrum Methods 0.000 claims description 3
- 238000012360 testing method Methods 0.000 abstract description 6
- 230000015572 biosynthetic process Effects 0.000 abstract description 3
- 238000003786 synthesis reaction Methods 0.000 abstract description 3
- 238000011156 evaluation Methods 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 125000004435 hydrogen atom Chemical group [H]* 0.000 description 4
- 238000005259 measurement Methods 0.000 description 4
- 230000006641 stabilisation Effects 0.000 description 3
- 238000011105 stabilization Methods 0.000 description 3
- 238000002955 isolation Methods 0.000 description 2
- 239000002932 luster Substances 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 125000004429 atom Chemical group 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000013100 final test Methods 0.000 description 1
- 230000005283 ground state Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
- H03L7/00—Automatic control of frequency or phase; Synchronisation
- H03L7/26—Automatic control of frequency or phase; Synchronisation using energy levels of molecules, atoms, or subatomic particles as a frequency reference
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
- H03L7/00—Automatic control of frequency or phase; Synchronisation
- H03L7/06—Automatic control of frequency or phase; Synchronisation using a reference signal applied to a frequency- or phase-locked loop
- H03L7/08—Details of the phase-locked loop
- H03L7/099—Details of the phase-locked loop concerning mainly the controlled oscillator of the loop
- H03L7/0995—Details of the phase-locked loop concerning mainly the controlled oscillator of the loop the oscillator comprising a ring oscillator
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
- H03L7/00—Automatic control of frequency or phase; Synchronisation
- H03L7/06—Automatic control of frequency or phase; Synchronisation using a reference signal applied to a frequency- or phase-locked loop
- H03L7/16—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop
- H03L7/18—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop using a frequency divider or counter in the loop
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- Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
Abstract
The invention discloses an active hydrogen Zhong Maize signal detection system based on an ultra-narrow band phase-locked loop. The invention uses ultra-narrow band phase-locked loop and full digital direct frequency synthesis technology, can conveniently convert hydrogen pulse-taking signal to 10MHz signal capable of measuring stability, and ensures that the stability of 10MHz is the same as the pulse-taking signal, and can test the stability of pulse-taking signal of hydrogen atomic clock cavity system by using standard equipment. The invention converts the pulse-taking signal into the standard frequency signal usable by the user in a single module, not only can form the whole clock, but also can realize the detection and evaluation of the pulse-taking signal, and compared with the traditional analog phase-locked receiving scheme, the invention improves the short-term stability index and the phase noise index of the hydrogen atomic clock.
Description
Technical Field
The invention relates to an atomic clock, in particular to an electronic part of an active hydrogen atomic clock, belongs to the technical field of time-frequency measurement, and particularly relates to an active hydrogen Zhong Maize signal detection system based on an ultra-narrow band phase-locked loop. The high-integration narrow-band phase-locked pulse-taking signal detection device is used for converting a physical signal output by the resonant cavity into a 10MHz user signal, and is an indispensable important part for forming an active hydrogen atomic clock and evaluating a hydrogen atomic resonant cavity bubble system. Other types of narrowband phase-locked receiver designs may also be referenced.
Background
Atomic clocks are precision time measurement tools as a core device to build and maintain modern time scales. The active hydrogen atomic clock is a microwave atomic clock, and meets the technical requirements of the next generation navigation system, time frequency measurement, space science experiment and space engineering of China on the very high-precision miniaturized space active hydrogen atomic clock. The active hydrogen atomic clock complete machine is composed of a dielectric low-loss microwave resonant cavity bubble system and an electronics part. After hydrogen atoms pass through an atom preparation system and a collimation system, the hydrogen atoms in the (F=1, mF=0) state are injected into a storage bubble in a microwave resonant cavity, and under the combined action of the high-Q-value microwave cavity, self-excited oscillation is generated in the transition process between two hyperfine energy levels of the hydrogen atom ground states (F=1, mF=0) and (F=0, mF=0) in the storage bubble, so that a high-precision and high-stability hydrogen atom resonance pulse signal is generated. The quality of the pulse signal output by the bubble system is evaluated, usually by using a spectrum analyzer, but the stability cannot be evaluated.
Disclosure of Invention
In view of the above, the invention provides an active hydrogen Zhong Maize signal detection system based on an ultra-narrow band phase-locked loop, which can convert a pulse-to-luster signal into a standard frequency signal usable by a user in a single module, not only can form a whole clock, but also can realize detection and evaluation of the pulse-to-luster signal, and compared with the traditional analog phase-locked receiving scheme, the invention improves the short-term stability index and the phase noise index of a hydrogen atomic clock, and the full-digital loop can accurately adjust the output frequency, thereby meeting the requirement of accurate and adjustable output frequency of the active hydrogen atomic clock and obtaining good effects.
The invention relates to an active hydrogen Zhong Maize signal detection system based on an ultra-narrow band phase-locked loop, which comprises a mixing amplifying circuit, a crystal oscillator frequency multiplication amplifying circuit, a digital direct frequency synthesizer, a digital narrow band phase-locked loop and an output buffer circuit, wherein the mixing amplifying circuit is used for hydrogen pulse signals;
the crystal oscillator frequency multiplication amplifying circuit firstly multiplies a local crystal oscillator signal of 10MHz into a signal of 100MHz, then multiplies the frequency into a signal of 1.4GHz, amplifies and filters the frequency multiplied signal, and then divides the frequency multiplied signal into 2 paths by the power divider, wherein one path is used as J2 output, and local oscillation is observed; the other path participates in the frequency mixing of the frequency mixing amplifying circuit of the hydrogen pulse signal;
the frequency mixing amplifying circuit of the hydrogen pulse signal is used for amplifying the received hydrogen pulse signal 1.420405751 GHz+/-40 kHz, mixing with the 1.4GHz signal after frequency multiplication of the local crystal oscillator, and obtaining a 20.405751MHz signal after band-pass filtering; after the mixing 20.405751MHz signal is amplified, the signal is divided into 2 paths by a power divider, and one path of amplified signal is output as J5 and used for observing the frequency spectrum of the pulse-taking signal; the other path participates in the phase-locked loop to realize phase locking;
the digital direct frequency synthesizer is used for taking the 100MHz signal after frequency multiplication of the local crystal oscillator as a reference to synthesize a 405.571kHz signal with an accurate mantissa;
the phase-locked loop takes a 20MHz signal obtained by mixing a 20.405751MHz signal output by a mixing amplifying circuit of a hydrogen pulse signal and a 405.571kHz signal output by a digital direct frequency synthesizer as a reference signal to carry out phase locking on a local crystal oscillator signal of 10 MHz;
the output buffer circuit divides the local crystal oscillator signal into 2 paths by utilizing a power divider, and the local crystal oscillator signal is amplified and filtered to be used as J3 output and J4 output.
Preferably, a mixer amplifier circuit of hydrogen pulse signals is designed in a structure form of a first three stages of mixers and a second stage of mixers after band-pass filtering.
Preferably, a 20MHz signal obtained by mixing pulse-length signals through a narrow-band phase-locked loop and a 10MHz signal obtained by dividing crystal oscillator power are subjected to phase locking control on the 10MHz constant-temperature crystal oscillator through a digital phase discriminator, and the design of a ultra-narrow loop filter and the use of 10MHz phase discrimination frequency enable the output of the 10MHz crystal oscillator to reflect the frequency stability of the input pulse-length signals and ensure the phase noise index of the 10MHz signal; and the frequency stability of the pulse signal output by the cavity bubble system is evaluated by measuring the frequency stability of the local crystal oscillator 10MHz signal.
Preferably, the intermediate frequency direct frequency synthesizer module uses 100MHz as a reference, outputs a 405kHz low intermediate frequency signal with an accurate mantissa, mixes with a 20.405MHz signal of which the pulse-like signal is reduced to a high intermediate frequency through mixing to obtain a 20MHz phase discrimination reference signal, modifies the mantissa of the output signal of the direct frequency synthesizer through a digital interface, and can directly change the mantissa of the 20MHz phase discrimination signal, thereby finely adjusting the frequency of the 10MHz signal given by the crystal oscillator.
The beneficial effects are that:
the invention uses ultra-narrow band phase-locked loop and full digital direct frequency synthesis technology, can conveniently convert hydrogen pulse-taking signal to 10MHz signal which is convenient for stability measurement, ensures that the stability of 10MHz is the same as that of pulse-taking signal, and can test the stability of pulse-taking signal of cavity bubble system by using standard equipment. In addition, the device can also be used for forming a complete machine of the hydrogen atomic clock, and the direct frequency synthesis technology is used for carrying out frequency conversion, so that the error between a pulse signal and a theoretical value can be conveniently corrected after the complete machine is formed with a cavity bubble system, and the adjustment of the output frequency difference E-15 level of the hydrogen atomic clock is realized.
Drawings
Fig. 1 is a schematic block diagram of an active hydrogen Zhong Maize signal detection system based on an ultra-narrow band phase locked loop of the present invention.
The figure is a basic schematic diagram of a pulse-length detection system, and a hydrogen pulse-length signal mixing amplifying circuit, an all-digital narrow-band phase-locked circuit, an output buffer circuit, a direct frequency synthesizer and other modules are highly integrated in one module. All the functions are realized. The mixing amplifying circuit of the hydrogen pulse signal uses a scheme of front three stages and rear two stages, so that the best noise coefficient index can be obtained while the pulse signal reaching the mixer can be ensured to reliably push the mixer. The narrow-band phase-locked loop uses a full-digital structure, the phase-locked control of the 10MHz constant-temperature crystal oscillator is carried out on the 20MHz signal obtained by mixing the pulse-folded signals and the 10MHz signal obtained by dividing the crystal oscillator power through the digital phase discriminator, and the design of the ultra-narrow-band loop filter and the use of the 10MHz phase discrimination frequency enable the output of the 10MHz crystal oscillator to reflect the frequency stability of the input pulse-folded signals and ensure the phase noise index of the 10MHz signal.
The output buffer circuit uses a structure of two-stage amplification plus filter, so that isolation between output signals is ensured, frequency traction effect is reduced, and the output buffer circuit has important significance for obtaining final test indexes. The intermediate frequency direct frequency synthesizer module uses 100MHz as a reference, outputs a 405kHz low intermediate frequency signal with an accurate mantissa, mixes with a 20.405MHz signal of which the pulse signal is reduced to a high intermediate frequency through mixing to obtain a 20MHz phase discrimination reference signal, modifies the mantissa of the output signal of the direct frequency synthesizer through a digital interface, and can directly change the mantissa of the 20MHz phase discrimination signal, thereby finely adjusting the frequency of a 10MHz signal given by a crystal oscillator.
Fig. 2 is a schematic block diagram of a power supply circuit, the system realizes all functions in one module, the structure is complex, the frequency components are numerous, meanwhile, the measured pulse-gloss signal-110 dB power is very small, the system needs to ensure that the stability of the output signals of two paths of final 10MHz crystal oscillators is not lost, the design of the power supply system is crucial, therefore, the crystal oscillators are selected to be independently supplied with +12v, the low noise amplifier in the mixing amplifying circuit of the hydrogen pulse-gloss signal is independently supplied with +8v, other general amplifiers and digital phase-locked loop +5v are supplied with power, and the direct frequency synthesizer (DDS) is in a 3.3V power supply structure, each path uses a low-voltage difference linear power supply to carry out cascade transformation, and the final effect meets the requirements.
Detailed Description
The invention will now be described in detail by way of example with reference to the accompanying drawings.
The invention provides an active hydrogen Zhong Maize signal detection system based on an all-digital ultra-narrow band phase-locked loop, wherein an input signal is a pulse signal 1.420405751 GHz+/-40 kHz output by a physical part of a hydrogen clock, and is used as a reference signal of the phase-locked loop to lock a 10MHz voltage-controlled crystal oscillator, and the output signal is two paths of 10MHz sinusoidal signals (shown in figures 1J3 and J4) which are mutually isolated and have completely consistent power and performance, one path of 20 MHz+/-40 k pulse signal high intermediate frequency test output signal (shown in figure 1J 5) and one path of 1400MHz local oscillation test signal (shown in figure 1J 2). The whole set of system enables the output signal of the voltage-controlled crystal oscillator to have the accuracy and stability of hydrogen pulse signals.
The functional block diagram of the active hydrogen Zhong Maize signal detection system based on the ultra-narrow band phase-locked loop is shown in fig. 1, and specifically comprises the following parts:
(1) Mixing amplifying circuit for hydrogen pulse signal
The mixing amplifying circuit of the hydrogen pulse signal is mainly used for amplifying the pulse signal output by the physical part of the received hydrogen clock, mixing the pulse signal with a local oscillator signal and amplifying the mixing signal. After mixing and amplifying the pulse-taking signal, the pulse-taking signal is divided into two paths by an equal-proportion power divider, one path of signal is mixed with 1400MHz local oscillation signal by an amplifier to obtain a high intermediate frequency test signal of 20MHz + -40 kHz, and the high intermediate frequency test signal is filtered and amplified to be output as J5 for conveniently observing and calculating the working conditions of the pulse-taking signal amplifying circuit and the local oscillation circuit. The other path is further mixed with 405kHz signals generated by an intermediate frequency direct frequency synthesizer, and finally 20MHz signals are sent into a narrow-band digital phase-locked loop to serve as references, and phase discrimination is carried out on the signals with the frequency of 10MHz of the crystal oscillator, so that the narrow-band phase-locked loop is formed.
In the embodiment, the hydrogen pulse signal 1.420405751 GHz+/-40 kHz input by the J1 port is amplified by a three-stage series-connected low-noise microwave amplifier (noise coefficient is smaller than 0.4) and then mixed with a local oscillation signal to obtain a 20.405751 MHz+/-40 kHz signal. The local oscillation signal is obtained by 10 times frequency of a 10MHz signal output by a local constant temperature voltage controlled crystal oscillator to obtain a 100MHz signal, and then 14 times frequency of the 100MHz signal to obtain a 1.4GHz signal, wherein the 1.4GHz signal is amplified by an amplifier and filtered by a filter to be used as the local oscillation signal to participate in mixing of the pulse-like signal; after mixing the pulse-folded signal with a local 1.4GHz local oscillation signal, filtering a cavity frequency locking frequency modulation signal of +/-40 kHz by a band-pass filter, and amplifying by adopting a two-stage series-connection low-noise microwave amplifier. After mixing and amplifying pulse-taking signals, the pulse-taking signals are divided into two paths by a power divider, one path of signals are amplified by an amplifier and then output as J5, and the other path of signals are used as reference signals to enter a phase-locked loop.
(2) Output buffer circuit
The output buffer circuit mainly carries out output buffer on J3 and J4 signals used by a user, the output buffer uses a telling operational amplifier to carry out cascading, and uses a high-order LC filter to carry out filtering and impedance matching at the output end, so that the power of two paths of output signals is regulated, the isolation degree is increased, the frequency traction effect of a load on a constant-temperature crystal oscillator is avoided, and the filter improves the harmonic suppression degree of the output signals.
Specifically, after the 10MHz signal output by the local constant temperature voltage controlled crystal oscillator is amplified by an amplifier and is subjected to power division by a power divider, two paths of signals J3 and J4 are output for users to use, and before the signals are provided for the users to use, the output signals of the power divider are amplified by a secondary radio frequency amplifier, filtered by a passive filter and then output to the users.
(3) Phase-locked circuit
Amplifying and mixing the pulse-taking signals to obtain 20.405751MHz signals; the 20.405751MHz signal is divided into two paths by a power divider, and one path of signal is amplified and then is output as J5; after the other path of amplified and filtered, the amplified and filtered signal is mixed with a 405.571kHz signal generated by a digital direct frequency synthesizer DDS to generate a 20MHz signal; the digital phase-locked loop uses 20MHz as a reference of the digital phase-locked loop, simplifies a circuit, fully uses a partial frequency function in the digital phase-locked loop, and finally uses 10MHz as a phase discrimination frequency, thereby avoiding phase noise loss and introducing extra noise caused by the phase discrimination after the frequency multiplication of a 10MHz signal to 20 MHz. The 20MHz is used as a reference signal to enter a phase-locked loop PLL to lock a 10MHz crystal oscillator. The phase-locked loop uses an all-digital phase-locked loop, and the loop bandwidth is set to be smaller than 100mHz, so that noise outside the loop width can be filtered, and the frequency stability of a locked 10MHz signal is completely consistent with that of a pulse signal. The frequency stability of the 10MHz signal can be conveniently tested by using a standard instrument, so that the frequency stability of the pulse signal output by the cavity bubble system can be evaluated by measuring the 10MHz signal and the frequency stability of the pulse signal output by the crystal oscillator is completely consistent.
In addition, the phase-locked loop synthesizes 405.571kHz signal by using a digital direct frequency synthesizer, and the digital interface is used for adjusting the accurate mantissa of 405.571kHz signal, which is equivalent to changing the frequency of the reference signal of the phase-locked loop, so that the frequency of the phase-locked loop constant temperature crystal oscillator of 10MHz can be directly changed. When the device and the cavity bubble system are used for forming the whole hydrogen atomic clock, the frequency accuracy of the output signal of the whole clock can be adjusted to the E-15 level through the digital interface, so that the frequency accuracy of the output signal of the whole clock reaches the E-14 level, and the clock has the capability of being controlled by other frequency sources.
(4) Power supply circuit
The system provides +12V power supply, in consideration of the anti-interference problem in the highly integrated module, +12V is supplied to a 10MHz crystal oscillator for use after filtering, +8V is generated through voltage stabilization and is supplied to a low noise amplifier for independent use, a common amplifier and a digital phase-locked loop are powered by +5V generated through voltage stabilization of +8V, a direct frequency synthesizer (DDS) is powered by +3.3V generated through voltage stabilization of +5V, and a power supply system is used for cascade transformation through a low-dropout linear power supply. The mutual influence of the power supplies of all parts is reduced, the analog and digital parts are not interfered with each other, and the function of the whole machine is realized.
In summary, the above embodiments are only preferred embodiments of the present invention, and are not intended to limit the scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (5)
1. An active hydrogen Zhong Maize signal detection system based on an ultra-narrow band phase-locked loop is characterized by comprising a mixing amplification circuit, a crystal oscillator frequency multiplication amplification circuit, a digital direct frequency synthesizer, a digital narrow band phase-locked loop and an output buffer circuit of hydrogen pulse signals;
the crystal oscillator frequency multiplication amplifying circuit firstly multiplies a local crystal oscillator signal of 10MHz into a signal of 100MHz, then multiplies the frequency into a signal of 1.4GHz, amplifies and filters the frequency multiplied signal, and then divides the frequency multiplied signal into 2 paths by the power divider, wherein one path is used as J2 output, and local oscillation is observed; the other path participates in the frequency mixing of the frequency mixing amplifying circuit of the hydrogen pulse signal;
the frequency mixing amplifying circuit of the hydrogen pulse signal is used for amplifying the received hydrogen pulse signal 1.420405751 GHz+/-40 kHz, mixing with the 1.4GHz signal after frequency multiplication of the local crystal oscillator, and obtaining a 20.405751MHz signal after band-pass filtering; after the mixing 20.405751MHz signal is amplified, the signal is divided into 2 paths by a power divider, and one path of amplified signal is output as J5 and used for observing the frequency spectrum of the pulse-taking signal; the other path participates in the phase-locked loop to realize phase locking;
the digital direct frequency synthesizer is used for taking the 100MHz signal after frequency multiplication of the local crystal oscillator as a reference to synthesize a 405.571kHz signal with an accurate mantissa;
the phase-locked loop takes a 20MHz signal obtained by mixing a 20.405751MHz signal output by a mixing amplifying circuit of a hydrogen pulse signal and a 405.571kHz signal output by a digital direct frequency synthesizer as a reference signal to carry out phase locking on a local crystal oscillator signal of 10 MHz;
the output buffer circuit divides the local crystal oscillator signal into 2 paths by utilizing a power divider, and the local crystal oscillator signal is amplified and filtered to be used as J3 output and J4 output.
2. The system of claim 1, wherein the mixer amplifier circuit for the hydrogen pulse signal is designed using a three-stage mixer-bandpass filtered two-stage configuration.
3. The system of claim 1, wherein the 20MHz signal obtained by mixing the pulse-taking signal through the narrow-band phase-locked loop and the 10MHz signal obtained by dividing the crystal oscillator power are phase-locked through the digital phase discriminator to control the 10MHz constant temperature crystal oscillator, the ultra-narrow-band loop filter design and the use of the 10MHz phase discrimination frequency enable the output of the 10MHz crystal oscillator to reflect the frequency stability of the input pulse-taking signal and ensure the phase noise index of the 10MHz signal; and the frequency stability of the pulse signal output by the cavity bubble system is evaluated by measuring the frequency stability of the local crystal oscillator 10MHz signal.
4. The system of claim 1 wherein the frequency of the 10MHz signal provided by the crystal is fine tuned by modifying the mantissa of the direct frequency synthesizer output signal to change the mantissa of the 20MHz phase discrimination signal to adjust the accuracy of the crystal output frequency.
5. The system of claim 1, wherein the amplifier in the mixer amplifier circuit for hydrogen pulse signal uses a low noise amplifier with a noise figure less than 0.4, the low noise amplifier being powered by +8v alone, the common amplifier being powered by +5v and the digital phase locked loop being powered by +12v alone, the crystal oscillator being powered by 3.3V.
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| CN202311241319.9A CN117318711A (en) | 2023-09-25 | 2023-09-25 | Active hydrogen Zhong Maize signal detection system based on ultra-narrow band phase-locked loop |
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| CN202311241319.9A CN117318711A (en) | 2023-09-25 | 2023-09-25 | Active hydrogen Zhong Maize signal detection system based on ultra-narrow band phase-locked loop |
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