CN118713599B - A coaxial dielectric oscillation circuit with low phase noise - Google Patents
A coaxial dielectric oscillation circuit with low phase noise Download PDFInfo
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- CN118713599B CN118713599B CN202411186689.1A CN202411186689A CN118713599B CN 118713599 B CN118713599 B CN 118713599B CN 202411186689 A CN202411186689 A CN 202411186689A CN 118713599 B CN118713599 B CN 118713599B
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- 230000001629 suppression Effects 0.000 abstract description 6
- 238000010586 diagram Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 238000002789 length control Methods 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 238000001228 spectrum Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03B—GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
- H03B5/00—Generation of oscillations using amplifier with regenerative feedback from output to input
- H03B5/30—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element being electromechanical resonator
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03B—GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
- H03B5/00—Generation of oscillations using amplifier with regenerative feedback from output to input
- H03B5/02—Details
- H03B5/04—Modifications of generator to compensate for variations in physical values, e.g. power supply, load, temperature
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Abstract
本发明公开了一种低相位噪声同轴介质振荡电路，属于微波介质振荡器领域，主要解决现有同轴介质振荡电路相位噪声较高的问题。该振荡电路包括第一串联谐振网络，与第一串联谐振网络相连的并联谐振网络，与并联谐振网络相连的第二串联谐振网络，与第二串联谐振网络相连的主谐振网络，以及与第二串联谐振网络和主谐振网络均相连的负阻电路。通过上述设计，本发明具备比传统同轴介质振荡器更低的相位噪声，其输出频率3.25GHz时在频偏100kHz处的相位噪声为‑145dBc/Hz，在频偏1MHz处的相位噪声为‑165dBc/Hz，且还具有比传统同轴介质振荡器更高的输出功率及更好的输出谐波抑制。
The present invention discloses a low phase noise coaxial dielectric oscillator circuit, which belongs to the field of microwave dielectric oscillators and mainly solves the problem of high phase noise of existing coaxial dielectric oscillator circuits. The oscillator circuit includes a first series resonant network, a parallel resonant network connected to the first series resonant network, a second series resonant network connected to the parallel resonant network, a main resonant network connected to the second series resonant network, and a negative resistance circuit connected to both the second series resonant network and the main resonant network. Through the above design, the present invention has a lower phase noise than a traditional coaxial dielectric oscillator, and its phase noise at a frequency deviation of 100kHz is ‑145dBc/Hz when the output frequency is 3.25GHz, and the phase noise at a frequency deviation of 1MHz is ‑165dBc/Hz, and it also has a higher output power and better output harmonic suppression than a traditional coaxial dielectric oscillator.
Description
Technical Field
The invention belongs to the field of microwave dielectric oscillators, and particularly relates to a low-phase-noise coaxial dielectric oscillation circuit.
Background
In the design of a radio frequency circuit, the oscillator has irreplaceable effects and advantages in the application of a radio frequency microwave signal generating circuit, along with the development of the oscillator circuit towards high frequency spectrum purity and low phase noise in the present stage, the phase noise of a traditional LC oscillator is very bad in a plurality of radio frequency microwave circuit systems, and particularly in the scene of low requirements of the phase noise related to frequency deviation of 10 kHz-1 MHz, the phase noise of the traditional LC oscillator can not meet the use requirements. The coaxial dielectric resonator can obtain a lower phase noise index when being applied to an oscillator due to a higher Q value, but the phase noise index of the traditional coaxial dielectric resonator also shows a general property. For example, some commercially available coaxial media oscillator already exists on the market with a phase noise of-135 dBc/Hz at a frequency offset of 100kHz at an output frequency of 3.25 GHz.
In patent CN111416576a, when the output frequency is 5.75GHz, the phase noise at 100kHz of the offset carrier is-131 dBc/Hz, equivalently, the phase noise at 100kHz of the offset carrier is-136 dBc/Hz when converted to 3.25GHz signal output, so that the phase noise level is generally difficult to meet in a scene with higher phase noise requirement.
Disclosure of Invention
The invention aims to provide a low-phase-noise coaxial medium oscillating circuit, which mainly solves the problem that the phase noise of the conventional coaxial medium oscillating circuit is higher.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
a low phase noise coaxial dielectric oscillation circuit includes a first series resonant network, a parallel resonant network connected to the first series resonant network, a second series resonant network connected to the parallel resonant network, a main resonant network connected to the second series resonant network, and a negative resistance circuit connected to both the second series resonant network and the main resonant network.
Further, in the present invention, the first series resonant network is constituted by a capacitor C1, a coaxial dielectric resonator T1, and a capacitor C2; one end of the capacitor C1 is grounded, the other end of the capacitor C1 is directly connected with one end of the coaxial dielectric resonator T1, and the other end of the coaxial dielectric resonator T1 is directly connected with one end of the capacitor C2; the other end of the capacitor C2 is connected to the parallel resonant network.
Further, in the invention, the parallel resonant network is formed by directly connecting a capacitor C3 and a coaxial dielectric resonator T2; one end of the capacitor C3 and one end of the coaxial dielectric resonator T2 which are connected with the other end of the capacitor C2, and the other ends of the capacitor C3 and the coaxial dielectric resonator T2 are respectively grounded; the connected end of the capacitor C3 and the coaxial dielectric resonator T2 is also connected to the second series resonant network.
Further, in the present invention, the second series resonant network is formed by directly connecting a capacitor C4 and a coaxial dielectric resonator T3; the free end of the capacitor C4 is connected with the capacitor C3 and one connected end of the coaxial dielectric resonator T2; the other end of the coaxial dielectric resonator T3 is connected to the main resonant network.
Further, in the present invention, the main resonance network includes a capacitor C6, a capacitor C7, a capacitor C8, a capacitor C11, a coaxial dielectric resonator T4, a resistor R4, and an inductor L2; wherein one end of the capacitor C6 is connected with the other end of the coaxial dielectric resonator T3; the other end of the capacitor C6 is connected with one end of the capacitor C7, the other end of the capacitor C7 is connected with one end of the capacitor C8 and one end of the coaxial dielectric resonator T4, the other end of the capacitor C8 is grounded, one end of the inductor L2 and one end of the capacitor C11 are both connected with the other end of the coaxial dielectric resonator T4, one end of the resistor R4 is connected with the other end of the inductor L2, and the other end of the resistor R4 and the other end of the capacitor C11 are grounded respectively; the common terminal of the capacitor C6 and the capacitor C7, and the common terminal of the coaxial dielectric resonator T4, the inductor L2, and the capacitor C11 are connected to a negative resistance circuit.
Further, in the present invention, the negative resistance circuit includes a transistor Q1 having a base connected to a common terminal of the capacitor C6 and the capacitor C7, an emitter connected to the common terminal of the coaxial dielectric resonator T4, an inductor L2, and the capacitor C11, an inductor L3 having one end connected to a collector of the transistor Q1, a capacitor C13, a resistor R6, and a resistor R7 connected in series, a capacitor C10 having one end connected to the collector of the transistor Q1 and the other end grounded, a capacitor C12 having one end connected to the common terminal of the inductor L3 and the capacitor C13 and the other end grounded, a resistor R5 having one end connected to the common terminal of the capacitor C13 and the resistor R6 and the other end grounded, an inductor L1 connected to the collector of the transistor Q1, a resistor R1 having one end connected to the common terminal of the inductor L1 and the other end connected to the base of the transistor Q1, a resistor R2 having one end connected to the base of the transistor Q1 and the other end grounded, a resistor R3 having one end connected to the base of the other end of the resistor C1 and the other end grounded, a resistor R1 having the other end connected to the other end of the resistor R1 and the other end grounded, and the capacitor C9 connected to the other end of the resistor C1 and the other end grounded; the common end of the resistor R1 and the capacitor C5 is used as an access point J1 of the oscillating circuit direct current power supply VCC; the common terminal of the resistor R6 and the resistor R7 is used as the output terminal of the oscillating circuit.
Further, in the present invention, the lengths of the coaxial dielectric resonator T1, the coaxial dielectric resonator T2 and the coaxial dielectric resonator T3 are all 1/4The length of the coaxial dielectric resonator T4 is 1/10; Wherein the method comprises the steps ofIs the wavelength of the oscillating output signal.
Compared with the prior art, the invention has the following beneficial effects:
(1) The oscillating circuit of the invention, due to the unique resonant circuit design, in particular, a coaxial resonator T4 is added between the emitter of a transistor Q1 and a capacitor C7 and a capacitor C8, meanwhile, a series resonant load formed by the capacitor C1, a coaxial dielectric resonator T1 and a capacitor C2, and a series resonant network formed by the capacitor C4 and the coaxial dielectric resonator T3 are loaded on the base of the transistor through a capacitor C6, so that the oscillating circuit has lower phase noise than the traditional coaxial dielectric oscillator, the phase noise at the frequency offset of 100kHz is 145dBc/Hz at the output frequency of 3.25GHz, and the phase noise at the frequency offset of 1MHz is 165dBc/Hz. For example, in patent CN111416576a, at an output frequency of 5.75GHz, the phase noise is-131 dBc/Hz at 100kHz of the offset carrier, equivalently, the phase noise is-136 dBc/Hz at 100kHz of the offset carrier when converted to 3.25GHz signal output, whereas the oscillating circuit of the present invention produces a 3.25GHz signal with-145 dBc/Hz at 100kHz of the frequency offset, which is 9dB better than the phase noise output by the circuit in patent CN111416576 a.
(2) The oscillating circuit of the invention also has higher output power and better output harmonic suppression than the traditional coaxial medium oscillator under the condition of lower phase noise than the traditional coaxial medium oscillator.
Drawings
Fig. 1 is a schematic block diagram of the circuit of the present invention.
Fig. 2 is a schematic diagram of circuit structure connection of a first series resonant network, a parallel resonant network, and a second series resonant network in the present invention.
Fig. 3 is a schematic circuit diagram of a main resonant network in the present invention.
Fig. 4 is a schematic circuit diagram of a negative resistance circuit according to the present invention.
Fig. 5 is a graph of the output phase noise of the coaxial dielectric oscillator according to the present invention.
FIG. 6 is a graph of the spectrum obtained by the present invention.
Detailed Description
The invention will be further illustrated by the following description and examples, which include but are not limited to the following examples.
As shown in fig. 1, the low-phase noise coaxial dielectric oscillating circuit disclosed by the invention comprises a first series resonance network, a parallel resonance network connected with the first series resonance network, a second series resonance network connected with the parallel resonance network, a main resonance network connected with the second series resonance network, and a negative resistance circuit connected with both the second series resonance network and the main resonance network.
As shown in fig. 2, in the present embodiment, the first series resonant network is constituted by a capacitor C1, a coaxial dielectric resonator T1, and a capacitor C2; one end of the capacitor C1 is grounded, the other end of the capacitor C1 is directly connected with one end of the coaxial dielectric resonator T1, and the other end of the coaxial dielectric resonator T1 is directly connected with one end of the capacitor C2; the other end of the capacitor C2 is connected to the parallel resonant network. The coaxial dielectric resonator T1 and the capacitor C1 form series resonance, the resonance frequency is consistent with the output frequency of the oscillator, and then loose coupling is realized through the capacitor C2 and the rear-stage main resonance circuit, so that the Q value of the whole circuit is favorably provided, and better phase noise index is realized.
As shown in fig. 2, in the present embodiment, the parallel resonant network is formed by directly connecting a capacitor C3 and a coaxial dielectric resonator T2; one end of the capacitor C3 and one end of the coaxial dielectric resonator T2 which are connected with the other end of the capacitor C2, and the other ends of the capacitor C3 and the coaxial dielectric resonator T2 are respectively grounded; the connected end of the capacitor C3 and the coaxial dielectric resonator T2 is also connected to the second series resonant network. The coaxial dielectric resonator T2 and the capacitor C3 are connected in parallel to ground, whereby the near-end phase noise of the output signal can be reduced.
As shown in fig. 2, in the present embodiment, the second series resonant network is formed by directly connecting a capacitor C4 and a coaxial dielectric resonator T3; the free end of the capacitor C4 is connected with the capacitor C3 and one connected end of the coaxial dielectric resonator T2; the other end of the coaxial dielectric resonator T3 is connected to the main resonant network. The coaxial dielectric resonator T3 and the capacitor C4 form a series resonant network, but the resonant frequency is slightly higher than the output frequency of the oscillator, so that the resonant network integrally shows high Q-factor, the Q value of the integral oscillating circuit is further improved, and the phase noise of an output signal is further reduced. The Q value here is the quality factor of the resonator.
As shown in fig. 3, in the present embodiment, the main resonance network includes a capacitor C6, a capacitor C7, a capacitor C8, a capacitor C11, a coaxial dielectric resonator T4, a resistor R4, and an inductor L2; wherein one end of the capacitor C6 is connected with the other end of the coaxial dielectric resonator T3; the other end of the capacitor C6 is connected with one end of the capacitor C7, the other end of the capacitor C7 is connected with one end of the capacitor C8 and one end of the coaxial dielectric resonator T4, the other end of the capacitor C8 is grounded, one end of the inductor L2 and one end of the capacitor C11 are both connected with the other end of the coaxial dielectric resonator T4, one end of the resistor R4 is connected with the other end of the inductor L2, and the other end of the resistor R4 and the other end of the capacitor C11 are grounded respectively; the common terminal of the capacitor C6 and the capacitor C7, and the common terminal of the coaxial dielectric resonator T4, the inductor L2, and the capacitor C11 are connected to a negative resistance circuit. The core idea of the partial circuit is that a coaxial dielectric resonator T4 is connected between a capacitor C7, a capacitor C8 and an emitter of a transistor Q1 in a bridging way, so that the high Q value of a main vibration circuit is realized, the length control of the coaxial dielectric resonator T4 is important, the length control of the coaxial dielectric resonator T4 is controlled to be 1/10 of the wavelength of an output signal, and compared with a traditional oscillating circuit, the design is a unique innovation and is an important method for realizing low phase noise. Resistor R4 primarily determines the dc operating current of transistor Q1 and inductor L2 achieves choking of the ac signal, although this inductor may be eliminated, with resistor R4 directly connected to the transistor emitter, but the oscillating signal will achieve better phase noise when inductor L2 is present. The capacitor C11 is connected to the emitter of the transistor Q1, and thus decoupling of the ac signal is achieved, which also contributes to stable operation of the oscillating circuit.
As shown in fig. 4, in this embodiment, the negative resistance circuit includes a transistor Q1 having a base connected to the common terminal of the capacitor C6 and the capacitor C7, an emitter connected to the common terminal of the coaxial dielectric resonator T4, the inductor L2, and the capacitor C11, an inductor L3 having one end connected to the collector of the transistor Q1, a capacitor C13, a resistor R6, and a resistor R7, a capacitor C10 having one end connected to the collector of the transistor Q1 and the other end grounded, a capacitor C12 having one end connected to the common terminal of the inductor L3 and the capacitor C13 and the other end grounded, a resistor R5 having one end connected to the common terminal of the capacitor C13 and the resistor R6 and the other end grounded, an inductor L1 having one end connected to the collector of the transistor Q1, a resistor R2 having the other end connected to the common terminal of the inductor L1 and the other end connected to the base of the transistor Q1, a resistor R3 having one end connected to the base of the transistor Q1 and the other end grounded, a resistor R1 having the other end connected to the other end of the capacitor C1 and the other end grounded, and a capacitor C9 connected to the other end of the resistor C1 and the other end grounded; the common end of the resistor R1 and the capacitor C5 is used as an access point J1 of the direct current power supply VCC of the oscillating circuit, and the resistor R1, the capacitor C5 and the capacitor C9 realize filtering of input power supply noise; the common terminal of the resistor R6 and the resistor R7 is used as the output terminal of the oscillating circuit. The resistor R4 forms a direct current path with the inductor L2 in the negative resistance circuit and the emitter of the transistor Q1, so that the resistor R4 serves as a current limiting resistor to limit the operating current of the transistor Q1. The transistor Q1 and its peripheral bias circuit mainly realize the generation of negative resistance, which is an indispensable part for forming stable oscillation of the oscillation circuit, and the peripheral bias circuit includes a resistor R1, a resistor R2, an inductor L2, and a resistor R4. The resistor R5, the resistor R6 and the resistor R7 form an attenuator, so that standing waves of the output port of the whole oscillator can be effectively reduced, and good matching of the output end is realized. Capacitor C10 achieves matching of the collector output of transistor Q1, inductor L3 and capacitor C12 achieve matching of the output of transistor Q1 and harmonic suppression of the output signal, and capacitor C13 achieves blocking.
In this embodiment, the transistor is a high-frequency bipolar transistor with a maximum collector current of not less than 100mA, the coaxial dielectric resonator is a resonator with a dielectric constant of 37 and a Q value of not less than 300, and the lengths of the coaxial dielectric resonator T1, the coaxial dielectric resonator T2, and the coaxial dielectric resonator T3 are all 1/4The length of the coaxial dielectric resonator T4 is 1/10; Wherein the method comprises the steps ofIs the wavelength of the oscillating output signal.
In the embodiment, the resistor R1 is a resistor of RT0603 series, the other resistors are precise resistors of RC0201FR series, the capacitors are GRM 1885C1H series high-frequency capacitors, and the inductors are 0402CS series high-frequency winding inductors.
In this embodiment, the resistance of the resistor R2 and the resistor R3 is generally 1-2kΩ, and the resistance of the resistor R1 is generally 5-20Ω. The resistance of resistor R4 is typically less than 1kΩ.
The implementation results of the design and the embodiment show that the coaxial medium oscillating circuit is effective, is suitable for board-level circuits, is particularly suitable for small-size low-phase noise application scenes, can effectively obtain low-phase noise oscillating signals, and realizes phase noise indexes of-145 dBc/Hz at a frequency offset of 100kHz and-165 dBc/Hz at a frequency offset of 1 MHz; the phase noise is shown in fig. 5. The phase noise of the oscillating signal obtained by the circuit is 10dB better than that of the oscillating circuit of the traditional coaxial medium, which clearly has a larger performance advantage, and according to the output signal spectrogram of the oscillating circuit of fig. 6, the output power of the oscillating circuit is 7.3dBm, and the second harmonic power is-10 dBm, namely the second harmonic suppression is-17.3 dBc in the embodiment.
When the oscillating circuit according to the invention is applied, higher harmonic suppression can be obtained by adjusting the values of the inductor L3 and the capacitor C12, but the output power will vary somewhat. When adjusting harmonic suppression, adjusting the value of capacitor C10 is avoided, as variations in capacitor C10 can affect the phase noise of the output signal.
The above embodiment is only one of the preferred embodiments of the present invention, and should not be used to limit the scope of the present invention, but all the insubstantial modifications or color changes made in the main design concept and spirit of the present invention are still consistent with the present invention, and all the technical problems to be solved are included in the scope of the present invention.
Claims (5)
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104953982A (en) * | 2015-07-23 | 2015-09-30 | 安徽华东光电技术研究所 | Method for improving coaxial-cavity dielectric oscillator |
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| JPH08307150A (en) * | 1995-04-27 | 1996-11-22 | Sumitomo Metal Mining Co Ltd | Microwave oscillator |
| US6297704B1 (en) * | 1999-09-30 | 2001-10-02 | Nortel Networks Corporation | Oscillation circuits featuring coaxial resonators |
| CN106877819B (en) * | 2016-11-21 | 2020-08-11 | 成都仕芯半导体有限公司 | Voltage controlled oscillator based on composite resonator |
| CN109921807A (en) * | 2018-04-02 | 2019-06-21 | 南京邮电大学 | A kind of broadband chaotic oscillating circuit |
| CN115865026A (en) * | 2022-11-22 | 2023-03-28 | 三微电子科技(苏州)有限公司 | Microwave voltage-controlled oscillator with low phase noise |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104953982A (en) * | 2015-07-23 | 2015-09-30 | 安徽华东光电技术研究所 | Method for improving coaxial-cavity dielectric oscillator |
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