CN113595505A - Anti-interference X-waveband voltage-controlled oscillator - Google Patents
Anti-interference X-waveband voltage-controlled oscillator Download PDFInfo
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- CN113595505A CN113595505A CN202110712030.5A CN202110712030A CN113595505A CN 113595505 A CN113595505 A CN 113595505A CN 202110712030 A CN202110712030 A CN 202110712030A CN 113595505 A CN113595505 A CN 113595505A
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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
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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
- H03B5/08—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance
- H03B5/12—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance active element in amplifier being semiconductor device
- H03B5/1203—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance active element in amplifier being semiconductor device the amplifier being a single transistor
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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
- H03B5/08—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance
- H03B5/12—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance active element in amplifier being semiconductor device
- H03B5/1237—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance active element in amplifier being semiconductor device comprising means for varying the frequency of the generator
- H03B5/124—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance active element in amplifier being semiconductor device comprising means for varying the frequency of the generator the means comprising a voltage dependent capacitance
- H03B5/1243—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance active element in amplifier being semiconductor device comprising means for varying the frequency of the generator the means comprising a voltage dependent capacitance the means comprising voltage variable capacitance diodes
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
An anti-interference X-band voltage-controlled oscillator utilizes a built-up circuit to improve the anti-interference capability of the X-band voltage-controlled oscillator from the circuit structure, and the circuit of the voltage-controlled oscillator is transformed, so that a low-frequency signal is inhibited from being conducted to a variable capacitance diode through the transformed circuit, the low-frequency signal cannot be modulated onto the working frequency of an oscillator, and cannot be amplified by a positive feedback amplifier; the impedance of the added circuit is low resistance at the oscillation frequency, so that extra circuit loss is not introduced, and the functional performance of the oscillator is not influenced; and the sensitive parameter phase noise of the oscillator is not influenced, so that the anti-interference capability of the voltage-controlled oscillator is fundamentally improved, and the stability of the whole frequency source system and the communication system is improved.
Description
Technical Field
The invention relates to an anti-interference X-band voltage-controlled oscillator, and belongs to the field of oscillator circuit design.
Background
From the perspective of feedback, the voltage-controlled oscillator can be divided into two parts, one part is a resonant network with a frequency-selecting function and is composed of a variable capacitance diode and an LC element, and the other part is an amplifier with positive feedback, namely a negative resistance and is composed of a triode and an LC element. After the voltage-controlled oscillator is powered on, the resonant network selects a signal with a specific frequency to be selected and sent to the positive feedback amplifier; the signal is positively fed back and cyclically amplified until the amplification amount of the amplifier is the same as the attenuation amount of the resonant network, and the signal is stable. The voltage-controlled oscillator generates a signal with a specific frequency from nothing, so the voltage-controlled oscillator can also be regarded as an amplifier with a large gain for the signal with the frequency, which is why the interference resistance of the voltage-controlled oscillator is poor.
In the anti-interference and anti-electromagnetic compatibility design of a frequency source system, the voltage-controlled oscillator is usually prevented from being interfered in a mode that the whole voltage-controlled oscillator is physically far away from an interference source, namely parts such as a digital processing part and a switching power supply, or a whole radio frequency part and the interference source part are in single-point common ground, and the like, and people rarely reform the voltage-controlled oscillator circuit, so that the anti-interference capability of the voltage-controlled oscillator is improved, and related patents are not inquired. Now, as the integration degree of products is higher and higher, despite measures such as relatively far away in physics and common ground in a single point, the voltage controlled oscillator is interfered, so that the stability of a frequency source system and the whole communication system is affected, and therefore, the work of modifying the voltage controlled oscillator circuit to improve the anti-interference capability thereof is urgent and necessary.
Disclosure of Invention
The technical problem solved by the invention is as follows: the anti-interference X-band voltage-controlled oscillator is provided for solving the problem that the traditional voltage-controlled oscillator is difficult to avoid interference by methods such as being far away from an interference source and sharing the ground by a single point in the prior art.
The technical scheme for solving the technical problems is as follows:
an anti-interference X-band voltage-controlled oscillator comprises an oscillation triode U1, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a choke inductor L1, a choke inductor L2, a choke inductor L5, a filter capacitor C1, a filter capacitor C2, a capacitor C5, a feedback capacitor C6, a capacitor C7, an output coupling capacitor C3, a coupling capacitor C4, a varactor diode D1, an inductor L3, an inductor L4 and a capacitor C8, wherein:
one end of a resistor R1 is connected with a power supply end, the other end of the resistor R1 is connected with one end of a resistor R3 and one end of a choke inductor L1, a filter capacitor C2 is arranged between the resistor R3 and the ground, the other end of a resistor R3 is respectively connected with one end of a resistor R2 and one end of a choke inductor L2, the filter capacitor C1 is arranged between the choke inductor L2 and the ground, and the other end of the resistor R2 is grounded;
the other end of the choke inductor L2 is connected with the base of the oscillating triode U1 and one end of the feedback capacitor C6, the collector of the oscillating triode U1 is connected with the other end of the choke inductor L1, the output coupling capacitor C3 is arranged between the output end and the collector of the oscillating triode U1, the emitter of the oscillating triode U1 is respectively connected with the other end of the feedback capacitor C6 and one end of the choke inductor L5;
the other end of the feedback capacitor C6 is connected with one end of a coupling capacitor C4, the other end of the coupling capacitor C4 is respectively connected with one end of an inductor L3 and one end of an inductor L4, the other end of the inductor L3 is connected with the anode of a variable capacitance diode D1, the cathode of the variable capacitance diode D1 is respectively connected with an external electric regulation end and one end of a capacitor C5, and the other end of the capacitor C5 is grounded;
the other end of the choke inductor L5 is respectively connected with one end of a capacitor C7 and one end of a resistor R4, and the other end of the capacitor C7 and the other end of the resistor R4 are grounded;
the other end of the inductor L4 is connected with one end of a capacitor C8 and one end of a resistor R5, and the other end of the capacitor C8 and the other end of the resistor R5 are both grounded.
The resistor R1, the resistor R2, the resistor R3 and the resistor R4 provide direct current bias for the oscillating triode U1, the capacitor C7 provides an alternating current path for the oscillating triode U1 and influences output frequency, the coupling capacitor C4 influences the output frequency of the oscillating triode U1, and the inductor L4 provides direct current bias for the varactor D1.
The feedback capacitor C6 is a capacitor between the emitter and the base, and can be replaced by a parasitic capacitor of the oscillating triode under certain conditions.
The resistor R5 provides direct current bias for the varactor D1, and the capacitor C8 is used for providing an alternating current path and performs impedance on low-frequency interference signals with the resistor R5 to improve interference resistance.
The low-frequency interference signal is conducted by a ground terminal along an increasing circuit consisting of a resistor R5 and a capacitor C8.
The network impedance Zn calculation method of the increasing circuit consisting of the resistor R5 and the capacitor C8 comprises the following steps:
wherein ω is 2 × pi × f, and f is the working frequency.
The network impedance Zn calculation method of the increasing circuit consisting of the resistor R5 and the capacitor C8 comprises the following steps:
in the formula, ω is 2 × pi × f, f is the working frequency, Zn is in a high impedance state at the low frequency spurious frequency, and Zn is in a low impedance state at the oscillation frequency, without additional circuit loss.
The value C of the capacitor C8 needs to satisfy
In the formula (f)1Spurious frequencies of low frequency, f2The oscillator frequency is a high frequency.
The value of the resistor R5 is not less than 1k omega, and
wherein f is the operating frequency, and C is the capacitance of the capacitor C8.
The Q value of the capacitor C8 is determined according to the Q values of C4 and C6.
Compared with the prior art, the invention has the advantages that:
according to the anti-interference X-waveband voltage-controlled oscillator, the low-frequency signal is prevented from being conducted to the variable capacitance diode through the improved circuit, so that the low-frequency signal cannot be modulated onto the working frequency of the oscillator and cannot be amplified by the positive feedback amplifier, the anti-interference capability of the voltage-controlled oscillator is fundamentally improved, meanwhile, the sensitive parameter phase noise of the oscillator is not influenced, the stability of the whole frequency source system and the communication system is improved, meanwhile, the whole circuit design is convenient for the integration of the whole frequency source system, and the miniaturization design is achieved.
Drawings
FIG. 1 is a schematic diagram of a typical X-band voltage controlled oscillator circuit provided by the present invention;
FIG. 2 is a schematic diagram of an improved anti-interference X-band voltage-controlled oscillator circuit provided by the invention;
fig. 3 is a schematic diagram showing comparison of response results to interference signals before and after the interference rejection provided by the present invention;
Detailed Description
The utility model provides an anti-interference X wave band voltage controlled oscillator, utilizes the increase circuit of structure, from the structural interference killing feature who has improved X wave band voltage controlled oscillator of circuit, carries out voltage controlled oscillator circuit transformation, and voltage controlled oscillator circuit concrete structure is as follows:
the circuit comprises an oscillation triode U1, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a choke inductor L1, a choke inductor L2, a choke inductor L5, a filter capacitor C1, a filter capacitor C2, a capacitor C5, a feedback capacitor C6, a capacitor C7, an output coupling capacitor C3, a coupling capacitor C4, a varactor diode D1, an inductor L3, an inductor L4 and a capacitor C8, wherein:
one end of a resistor R1 is connected with a power supply end, the other end of the resistor R1 is connected with one end of a resistor R3 and one end of a choke inductor L1, a filter capacitor C2 is arranged between the resistor R3 and the ground, the other end of a resistor R3 is respectively connected with one end of a resistor R2 and one end of a choke inductor L2, the filter capacitor C1 is arranged between the choke inductor L2 and the ground, and the other end of the resistor R2 is grounded;
the other end of the choke inductor L2 is connected with the base of the oscillating triode U1 and one end of the feedback capacitor C6, the collector of the oscillating triode U1 is connected with the other end of the choke inductor L1, the output coupling capacitor C3 is arranged between the output end and the collector of the oscillating triode U1, the emitter of the oscillating triode U1 is respectively connected with the other end of the feedback capacitor C6 and one end of the choke inductor L5;
the other end of the feedback capacitor C6 is connected with one end of a coupling capacitor C4, the other end of the coupling capacitor C4 is respectively connected with one end of an inductor L3 and one end of an inductor L4, the other end of the inductor L3 is connected with the anode of a variable capacitance diode D1, the cathode of the variable capacitance diode D1 is respectively connected with an external electric regulation end and one end of a capacitor C5, and the other end of the capacitor C5 is grounded;
the other end of the choke inductor L5 is respectively connected with one end of a capacitor C7 and one end of a resistor R4, and the other end of the capacitor C7 and the other end of the resistor R4 are grounded;
the other end of the inductor L4 is connected with one end of a capacitor C8 and one end of a resistor R5, and the other end of the capacitor C8 and the other end of the resistor R5 are both grounded.
In terms of functions, the resistor R1, the resistor R2, the resistor R3 and the resistor R4 provide direct current bias for the oscillating triode U1, the capacitor C7 provides an alternating current path for the oscillating triode U1 and affects output frequency, the coupling capacitor C4 affects output frequency of the oscillating triode U1, and the inductor L4 provides direct current bias for the varactor diode D1;
the feedback capacitor C6 is a capacitor between the emitter and the base, and can be replaced by a parasitic capacitor of the oscillating triode under a certain condition;
the resistor R5 provides direct current bias for the variable capacitance diode D1, the capacitor C8 is used for providing an alternating current path, and the resistor R5 and the capacitor C8 perform impedance on low-frequency interference signals so as to improve the anti-interference capacity;
the low-frequency interference signal is conducted by a ground terminal along an adding circuit consisting of a resistor R5 and a capacitor C8.
The network impedance Zn of the increasing circuit consisting of the resistor R5 and the capacitor C8 is
Where ω is 2 × pi × f, and f is the operating frequency. Zn is in a high-impedance state at the low-frequency stray frequency, so that the high attenuation of the low-frequency stray is realized, and the anti-interference effect is achieved; meanwhile, Zn is low in oscillation frequency, extra circuit loss is not introduced, and the functional performance of the oscillator is not affected.
The value C of the capacitor C8 needs to satisfy
(wherein f1Spurious frequencies of low frequency, f2The oscillator frequency is a high frequency. )
The value of the resistor R5 is more than or equal to 1k omega
(where f is the operating frequency and C is the capacitance of capacitor C8.)
The capacitor C8 participates in the oscillation of the voltage-controlled oscillator, and the quality factor Q value of the C8 is close to the quality factor Q values of the C4 and the C6, so that the C8 can not deteriorate the phase noise of the whole oscillator.
The following is further illustrated with reference to specific examples:
in this embodiment, as shown in fig. 1, which is a schematic diagram of a typical X-band voltage-controlled oscillator, U1 is an oscillating triode, R1, R2, R3, and R4 provide a dc bias for the oscillating triode, inductors L1, L2, and L5 are choke inductors, capacitors C1, and C2 are filter capacitors, capacitor C6 is a feedback capacitor between an emitter and a base, and can be replaced by a parasitic capacitor of the oscillating triode under a high frequency condition, capacitor C7 provides an ac path and affects a final output frequency, capacitor C3 is an output coupling capacitor, and capacitor C4 is a coupling capacitor between a resonant circuit and the base of the oscillating triode and affects the final output frequency; varactor D1, capacitor C1, inductors L3, L4 are resonant circuits, wherein inductor L4 is grounded while providing a dc bias to varactor D1.
The impedance of the inductor and the capacitor is a function of frequency, the inductor is electrified with direct current to throttle high-frequency alternating current, and low impedance is presented to low-frequency signals; the capacitor is connected with high-frequency alternating current, cuts off direct current and presents high impedance for low-frequency signals.
The improved circuit structure of the voltage-controlled oscillator is shown in fig. 2, and a resistor R5 and a capacitor C8 which are connected in parallel are added to a ground terminal of an inductor L4. Thus, resistor R5 provides a dc bias for varactor D1 and capacitor C8 provides an ac path for the oscillation frequency. Meanwhile, the C8 presents high resistance to low-frequency interference signals, and the R5 has certain impedance to the low-frequency signals, so that the low-frequency interference signals conducted from the ground end are prevented from being conducted into the resonant loop, and the anti-interference capability is improved.
The response effect on the low-frequency interference signal before and after the modification based on the modified circuit of the invention is shown in fig. 3. The resistor R5 and the capacitor C8 which are connected in parallel are added to the ground terminal in the circuit, so that the low-frequency interference signal conducted from the ground terminal is inhibited from being conducted to the resonant loop, and the anti-interference capability of the X-frequency band voltage-controlled oscillator is fundamentally improved.
Although the present invention has been described with reference to the preferred embodiments, it is not intended to limit the present invention, and those skilled in the art can make variations and modifications of the present invention without departing from the spirit and scope of the present invention by using the methods and technical contents disclosed above.
Those skilled in the art will appreciate that the details of the invention not described in detail in this specification are well within the skill of those in the art.
Claims (10)
1. An anti-interference X-band voltage-controlled oscillator, characterized by: the circuit comprises an oscillation triode U1, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a choke inductor L1, a choke inductor L2, a choke inductor L5, a filter capacitor C1, a filter capacitor C2, a capacitor C5, a feedback capacitor C6, a capacitor C7, an output coupling capacitor C3, a coupling capacitor C4, a varactor diode D1, an inductor L3, an inductor L4 and a capacitor C8, wherein:
one end of a resistor R1 is connected with a power supply end, the other end of the resistor R1 is connected with one end of a resistor R3 and one end of a choke inductor L1, a filter capacitor C2 is arranged between the resistor R3 and the ground, the other end of a resistor R3 is respectively connected with one end of a resistor R2 and one end of a choke inductor L2, the filter capacitor C1 is arranged between the choke inductor L2 and the ground, and the other end of the resistor R2 is grounded;
the other end of the choke inductor L2 is connected with the base of the oscillating triode U1 and one end of the feedback capacitor C6, the collector of the oscillating triode U1 is connected with the other end of the choke inductor L1, the output coupling capacitor C3 is arranged between the output end and the collector of the oscillating triode U1, the emitter of the oscillating triode U1 is respectively connected with the other end of the feedback capacitor C6 and one end of the choke inductor L5;
the other end of the feedback capacitor C6 is connected with one end of a coupling capacitor C4, the other end of the coupling capacitor C4 is respectively connected with one end of an inductor L3 and one end of an inductor L4, the other end of the inductor L3 is connected with the anode of a variable capacitance diode D1, the cathode of the variable capacitance diode D1 is respectively connected with an external electric regulation end and one end of a capacitor C5, and the other end of the capacitor C5 is grounded;
the other end of the choke inductor L5 is respectively connected with one end of a capacitor C7 and one end of a resistor R4, and the other end of the capacitor C7 and the other end of the resistor R4 are grounded;
the other end of the inductor L4 is connected with one end of a capacitor C8 and one end of a resistor R5, and the other end of the capacitor C8 and the other end of the resistor R5 are both grounded.
2. The anti-jamming X-band voltage controlled oscillator of claim 1, wherein:
the resistor R1, the resistor R2, the resistor R3 and the resistor R4 provide direct current bias for the oscillating triode U1, the capacitor C7 provides an alternating current path for the oscillating triode U1 and influences output frequency, the coupling capacitor C4 influences the output frequency of the oscillating triode U1, and the inductor L4 provides direct current bias for the varactor D1.
3. The anti-jamming X-band voltage controlled oscillator of claim 2, wherein:
the feedback capacitor C6 is a capacitor between the emitter and the base, and can be replaced by a parasitic capacitor of the oscillating triode under certain conditions.
4. The anti-jamming X-band voltage controlled oscillator of claim 2, wherein:
the resistor R5 provides direct current bias for the varactor D1, and the capacitor C8 is used for providing an alternating current path and performs impedance on low-frequency interference signals with the resistor R5 to improve interference resistance.
5. The anti-jamming X-band voltage controlled oscillator of claim 4, wherein:
the low-frequency interference signal is conducted by a ground terminal along an increasing circuit consisting of a resistor R5 and a capacitor C8.
6. The anti-jamming X-band voltage controlled oscillator of claim 4, wherein:
the network impedance Zn calculation method of the increasing circuit consisting of the resistor R5 and the capacitor C8 comprises the following steps:
wherein ω is 2 × pi × f, and f is the working frequency.
7. The anti-jamming X-band voltage controlled oscillator of claim 6, wherein:
the network impedance Zn calculation method of the increasing circuit consisting of the resistor R5 and the capacitor C8 comprises the following steps:
in the formula, ω is 2 × pi × f, f is the working frequency, Zn is in a high impedance state at the low frequency spurious frequency, and Zn is in a low impedance state at the oscillation frequency, without additional circuit loss.
8. The anti-jamming X-band voltage controlled oscillator of claim 6, wherein:
the value C of the capacitor C8 needs to satisfy
In the formula (f)1Spurious frequencies of low frequency, f2The oscillator frequency is a high frequency.
9. The anti-jamming X-band voltage controlled oscillator of claim 6, wherein:
the value of the resistor R5 is not less than 1k omega, and
wherein f is the operating frequency, and C is the capacitance of the capacitor C8.
10. The anti-jamming X-band voltage controlled oscillator of claim 6, wherein:
the Q value of the capacitor C8 is determined according to the Q values of C4 and C6.
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| CN113595505B CN113595505B (en) | 2023-08-29 |
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| CN117713812A (en) * | 2024-02-04 | 2024-03-15 | 安徽矽磊电子科技有限公司 | Broadband oscillator for phase-locked loop |
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| CN113595505B (en) | 2023-08-29 |
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