CN110719083B - Surface acoustic wave voltage-controlled oscillator and electronic equipment - Google Patents
Surface acoustic wave voltage-controlled oscillator and electronic equipment Download PDFInfo
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- CN110719083B CN110719083B CN201911105799.XA CN201911105799A CN110719083B CN 110719083 B CN110719083 B CN 110719083B CN 201911105799 A CN201911105799 A CN 201911105799A CN 110719083 B CN110719083 B CN 110719083B
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
- H03H9/02—Details
- H03H9/125—Driving means, e.g. electrodes, coils
- H03H9/145—Driving means, e.g. electrodes, coils for networks using surface acoustic waves
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
- H03H9/25—Constructional features of resonators using surface acoustic waves
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
- H03H9/46—Filters
- H03H9/64—Filters using surface acoustic waves
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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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- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Oscillators With Electromechanical Resonators (AREA)
Abstract
The invention relates to a surface acoustic wave voltage-controlled oscillator and electronic equipment, which solve the problem that the oscillator cannot work at negative voltage. The SAW voltage controlled oscillator comprises an amplifier, a SAW delay line and a phase shifting network. The amplifier cascade and the SAW delay line form a series positive feedback loop. The varactor and the inductor-capacitor form a resonant loop. And a variable phase shifting network is formed by adding a variable capacitance diode into the resonant circuit, and the capacitance value of the variable capacitance diode is changed by changing the bias voltage of the variable capacitance diode according to the characteristics of the variable capacitance diode, so that the phase of the resonant circuit is changed, and the purpose of frequency offset is achieved. The oscillator has the characteristics of simple circuit, large voltage control range, low phase noise, good vibration resistance, high reliability, high linearity and the like.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a surface acoustic wave voltage-controlled oscillator and an electronic device.
Background
The surface acoustic wave voltage-controlled oscillator is an oscillation source with high stability and low phase noise. The method has the advantages of high fundamental frequency, large frequency modulation frequency, good stability, low phase noise and the like. Compared with a quartz crystal oscillator, the high-frequency-stability phase-locked oscillator has large voltage-controlled frequency offset, and compared with an LC oscillator, the high-frequency-locked oscillator has excellent phase noise and frequency temperature stability. Because of these excellent properties, they find applications in radar, navigation, satellite communications, remote control telemetry, and the like. Surface acoustic wave voltage controlled oscillators are also used in civilian television systems, communication systems, and instrument manufacturing.
The SAW voltage-controlled oscillator is used for frequency modulation, the output frequency changes along with the change of the input voltage, but the input voltage of the traditional SAW voltage-controlled oscillator can only be positive voltage, and when negative voltage is input, the SAW voltage-controlled oscillator cannot work, so that the application of the device is limited.
Disclosure of Invention
In the prior art, when a negative voltage is input, the surface acoustic wave voltage-controlled oscillator cannot work, and in order to solve the technical problems, the invention provides the surface acoustic wave voltage-controlled oscillator, which is characterized in that: the system comprises a surface acoustic wave delay line 1, a first amplifier A, a second amplifier B and a phase shifting network; the surface acoustic wave delay line, the first amplifier A and the second amplifier B are sequentially connected to form a circulating feedback network; the phase shifting network comprises: the output end of the first amplifier A is connected with the anode of a first varactor A9, the output end of the second amplifier B is connected with the anode of a second varactor B20, the voltage-controlled voltage is respectively connected with the anode of the first varactor A9 and the anode of the second varactor B20, and the cathodes of the first varactor A9 and the second varactor A are respectively grounded in an alternating current manner and are both connected with the first voltage dividing circuit; the two varactors are connected with the two amplifiers through capacitors.
The invention has the beneficial effects that: the two diodes are not connected in parallel but are separately and independently distributed at the output ends of the two amplifiers, the phase shifting network is separately and respectively placed at the output ends of the amplifiers, but not together, the input range of the control voltage of the surface acoustic wave voltage-controlled oscillator is expanded, the positive voltage control and the negative voltage control can be performed, and the oscillator has the characteristics of simple circuit, wide application occasion, large voltage control range, low phase noise, good vibration resistance, high reliability, high linearity and the like.
Further, a power supply connected to each of the amplifiers via an inductor
Further, the third amplifier C: for buffer amplifying a feedback signal in the feedback network; the third amplifier C is inserted into the annular loop and is arranged at the output end of the second amplifier B.
The above-mentioned further beneficial effect is: the signal amplified by the second amplifier B is buffered and amplified by the triode C27.
Further, the output signal of the feedback network is connected to the fourth amplifier D, and the fourth amplifier D is used for buffering and amplifying the output signal before outputting.
The above-mentioned further beneficial effect is: the output signal of the feedback network is buffer amplified by a fourth amplifier D before being output.
Further, an inductor for isolating alternating current signals from a power supply is connected between the first voltage dividing circuit and the two varactors.
The above-mentioned further beneficial effect is: isolating the alternating current signal in the phase shifting network from the power supply.
Further, a second voltage dividing circuit is connected between the anodes of the two varactors and the voltage-controlled voltage; the second voltage dividing circuit comprises a first resistor J8, a second resistor K19 and a third resistor F13; one end of the first resistor J8 is directly connected with the anode of the first varactor A9; the other end of the first resistor J8 is connected with one end of the third resistor F13 and one end of the second resistor K19; the other end of the second resistor K19 is respectively connected with the output end of the second amplifier B and the anode of the second varactor B20; the other end of the third resistor F13 is connected to voltage-controlled voltage.
The above-mentioned further beneficial effect is: the anode voltage of the varactor can be changed by those skilled in the art by adjusting the resistance ratio as desired.
Further, the voltage control circuit further comprises a first inductor E12 connected in series with the voltage control voltage.
The above-mentioned further beneficial effect is: isolating the alternating current signal in the phase-shifting network from the voltage-controlled voltage.
Further, the first voltage dividing circuit comprises a fourth resistor E10, a fifth resistor G22, a sixth resistor I25 and a seventh resistor H24; one end of the fourth resistor E10 is connected to the cathode of the first varactor A9, and the other end is connected to one end of the fifth resistor G22, one end of the seventh resistor H24, and one end of the sixth resistor I25; the other end of the fifth resistor G22 is connected with the cathode of the second varactor B20; the other end of the sixth resistor I25 is grounded; the other end of the seventh resistor H24 is connected with the power supply.
The above-mentioned further beneficial effect is: the resistance ratio can be adjusted as needed by those skilled in the art to vary the cathode voltage of the varactor.
The invention also relates to an electronic device comprising any one of the above-mentioned saw voltage-controlled oscillators.
Drawings
Fig. 1 is a schematic diagram of a saw vco according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a saw vco according to an embodiment of the present invention.
1. The SAW delay line 1, 2, phase shifting network, 3, power supply, 4, first capacitor A2, 5, second capacitor B6, third capacitor H29, 7, first varactor A9, 8, second varactor B20, 9, first inductor E12, 10, first resistor J8, 11, second resistor K19, 12, third resistor F13, fourth capacitor D11, 14, fifth capacitor E21, 15, fourth resistor E10, 16, fifth resistor G22, 17, second inductor F23, 18, sixth resistor I25, 19, seventh resistor H24. Second inductor F23, 21, first triode A4, 22, third inductor A3, 23, eighth resistor A5, 24, second triode B15, 25, fourth inductor B14, 26, ninth resistor B16, 27, fifth inductor C26, 28, tenth resistor C28, 29, third triode C27, 30, sixth capacitor G18, 31, sixth inductor D31, 32, eleventh resistor D34, 33, fourth triode D33, 34, seventh capacitor I30, 35, eighth capacitor J32, 36, ninth capacitor C7, 37, tenth capacitor F17.
Detailed Description
In the following description, for purposes of explanation and not limitation, specific details are set forth such as the particular system architecture, interfaces, techniques, etc., in order to provide a thorough understanding of the present invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known devices, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.
Fig. 1 is a schematic diagram of a saw voltage-controlled oscillator according to an embodiment of the present invention, including a saw delay line 1, a first amplifier a, a second amplifier B, and a phase shift network; the surface acoustic wave delay line, the first amplifier A and the second amplifier B are connected to form an annular loop; the phase shifting network comprises a first varactor A9 and a second varactor B20; the anode of the first varactor A9 is connected with the output end of the first amplifier A.
The output signal of the surface acoustic wave delay line 1 is amplified by a first amplifier A, then enters a phase shift network formed by a first varactor A9, completes phase shift of the signal, enters a second amplifier B again for amplification after phase shift is completed, enters a phase shift network formed by a varactor B20 for phase shift again after amplification, and is amplified by a fourth triode D33 for output, and the other path is fed back to the input end of the surface acoustic wave delay line 1. After the surface wave delay line 1 finishes the frequency selection and phase shift of the signals, the signals enter the first amplifier and the second amplifier again for amplification. The surface wave delay line 1, the first amplifier A and the second amplifier B form a positive feedback network, and the circuit can start vibration and work normally as long as the gain of the network is larger than 1 and the phase is an integral multiple of 2 pi. The cathodes of the first varactor A9 and the second varactor B20 are not directly connected to ground, but are connected to a power supply through a first voltage dividing circuit, so that when the input voltage is negative, the first varactor A9 and the second varactor B20 are in a reverse bias state, and the first varactor A9 and the second varactor B20 are in a normal working state.
On the basis of the above embodiment, fig. 2 is a schematic diagram of a saw voltage controlled oscillator according to an embodiment of the present invention, including a saw delay line 1, a first amplifier a, a second amplifier B, and a phase shift network; the surface acoustic wave delay line, the first amplifier A and the second amplifier B are sequentially connected through a first capacitor A2, a second capacitor B6 and a third capacitor H29 respectively to form an annular loop; the phase shifting network comprises a first varactor A9, a second varactor B20, a first inductor E12, a first resistor J8, a second resistor K19 and a third resistor F13; the anode of the first varactor A9 is connected with the output end of the first amplifier A and one end of the first resistor J8; the other end of the first resistor J8 is connected with one end of the first inductor E12 and one end of the second resistor K19; the other end of the second resistor K19 is respectively connected with the output end of the second amplifier B and the anode of the second varactor B20; the cathode of the first varactor A9 and the cathode of the second varactor B20 are grounded; the other end of the first inductor E12 is connected with one end of the third resistor F13; the other end of the third resistor F13 is connected with voltage-controlled voltage; the cathode of the first varactor A9 and the cathode of the second varactor B20 are grounded through a fourth capacitor D11 and a fifth capacitor E21, respectively. The cathode of the first varactor A9 and the cathode of the second varactor B20 are respectively connected with one end of a second inductor F23 through a fourth resistor E10 and a fifth resistor G22, and the second inductor F23 is grounded through a sixth resistor I25; the power supply is connected with one end of a seventh resistor H24, and the other end of the seventh resistor H24 is connected with the connection part of the fifth resistor G22 and the second inductor F23.
The output signal of the surface acoustic wave delay line 1 is amplified by a first triode A4, then enters a phase shifting network formed by a first varactor A9, the phase shifting of the signal is completed, enters a second triode B15 again for amplification after the phase shifting is completed, and enters a phase shifting network formed by a varactor B20 for phase shifting again. After the signal subjected to twice amplification and phase shift is amplified by the third triode C27, the signal is divided into two paths, one path is amplified by the fourth triode D33 and then output, and the other path is fed back to the input end of the surface wave delay line 1. After the surface wave delay line 1 finishes the frequency selection and phase shift of signals, the signals enter a triode again for amplification. The surface wave delay line 1, the first triode A4 and the second triode B15 form a positive feedback network, and the circuit can start vibration and work normally as long as the gain of the network is larger than 1 and the phase is an integral multiple of 2 pi. The cathodes of the first varactor A9 and the second varactor B20 are not directly connected to ground, but are connected to a power supply through a first voltage dividing circuit, so that when the input voltage is negative, the first varactor A9 and the second varactor B20 are in a reverse bias state, and the first varactor A9 and the second varactor B20 are in a normal working state.
The invention can work at positive voltage and negative voltage, which expands the application range and occasion of the product. In particular, the conventional sine wave frequency modulation can be used, and the prior art cannot be used. The application scene comprises products containing the oscillator radar, satellites, navigation, remote control and remote measurement, television systems and communication systems.
In the invention, the first varactor A9 and the second varactor B20 are separated and are respectively and independently distributed behind the first triode A4 and the second triode B15, thereby improving the linearity of voltage control. The linearity of the invention is + -2%. Compared with the prior art, the index performance is obviously improved.
The embodiment of the invention provides electronic equipment, which comprises the electronic products of the oscillators in the embodiment, such as radar, satellite, television, communication equipment and the like.
The reader will appreciate that in the description of this specification, a description of terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
While embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the invention.
Claims (5)
1. A surface acoustic wave voltage controlled oscillator, characterized by: comprising the steps of (a) a step of,
the surface acoustic wave delay line (1), a first amplifier (A), a second amplifier (B) and a phase shifting network;
the surface acoustic wave delay line, the first amplifier (A) and the second amplifier (B) are sequentially connected to form a circulating feedback network;
the phase shifting network comprises:
the output end of the first amplifier (A) is connected with the anode of a first varactor (A9), the output end of the second amplifier (B) is connected with the anode of a second varactor (B20), the voltage-controlled voltage is respectively connected with the anode of the first varactor (A9) and the anode of the second varactor (B20), and the cathodes of the first varactor and the second varactor are respectively grounded in an alternating current manner and are both connected with the first voltage dividing circuit;
the two varactors are connected with the two amplifiers through capacitors;
further comprises: a power supply connected to each of said amplifiers through an inductance;
an inductor for isolating alternating current signals from a power supply is connected between the first voltage dividing circuit and the two varactors;
a second voltage dividing circuit is connected between the anodes of the two varactors and the voltage-controlled voltage;
the second voltage dividing circuit comprises a first resistor (J8), a second resistor (K19) and a third resistor (F13);
one end of the first resistor (J8) is directly connected with the anode of the first varactor (A9);
the other end of the first resistor (J8) is connected with one end of the third resistor (F13) and one end of the second resistor (K19);
the other end of the second resistor (K19) is respectively connected with the output end of the second amplifier (B) and the anode of the second varactor (B20);
the other end of the third resistor (F13) is connected with voltage-controlled voltage;
the first voltage dividing circuit comprises a fourth resistor (E10), a fifth resistor (G22), a sixth resistor (I25) and a seventh resistor (H24);
one end of the fourth resistor (E10) is connected with the cathode of the first varactor (A9), and the other end of the fourth resistor (E10) is connected with one end of the fifth resistor (G22), one end of the seventh resistor (H24) and one end of the sixth resistor (I25);
the other end of the fifth resistor (G22) is connected with the cathode of the second varactor (B20);
the other end of the sixth resistor (I25) is grounded;
the other end of the seventh resistor (H24) is used for being connected with the power supply.
2. A saw voltage controlled oscillator according to claim 1, wherein: also included is a method of manufacturing a semiconductor device,
third amplifier (C): for buffer amplifying a feedback signal in the feedback network;
the third amplifier (C) is inserted into the annular loop and is arranged at the output end of the second amplifier (B).
3. A saw voltage controlled oscillator according to claim 1 or 2, characterized in that: also included is a method of manufacturing a semiconductor device,
and the fourth amplifier (D) is connected with the output signal of the feedback network and is used for buffering and amplifying the output signal before outputting.
4. A saw voltage controlled oscillator according to claim 1, wherein: also included is a method of manufacturing a semiconductor device,
a first inductance (E12) of the voltage-controlled voltage is connected in series.
5. An electronic device comprising the saw voltage controlled oscillator of any one of claims 1 to 4.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911105799.XA CN110719083B (en) | 2019-11-13 | 2019-11-13 | Surface acoustic wave voltage-controlled oscillator and electronic equipment |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911105799.XA CN110719083B (en) | 2019-11-13 | 2019-11-13 | Surface acoustic wave voltage-controlled oscillator and electronic equipment |
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| CN110719083A CN110719083A (en) | 2020-01-21 |
| CN110719083B true CN110719083B (en) | 2023-08-04 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4560951A (en) * | 1983-02-17 | 1985-12-24 | Siemens Aktiengesellschaft | Voltage-controlled oscillator with surface-wave transmission line |
| US4581592A (en) * | 1983-05-03 | 1986-04-08 | R F Monolithics, Inc. | Saw stabilized oscillator with controlled pull-range |
| US5329256A (en) * | 1993-06-30 | 1994-07-12 | Motorola, Inc. | Tunable oscillator having a non-reflective saw resonator |
| TW349292B (en) * | 1996-02-14 | 1999-01-01 | Rf Monolithics | Feedback oscillator circuit using a saw resonator filter |
| CN102761316A (en) * | 2007-11-29 | 2012-10-31 | Nlt科技股份有限公司 | Delay element, variable delay line, and voltage controlled oscillator, as well as display device and system comprising the same |
-
2019
- 2019-11-13 CN CN201911105799.XA patent/CN110719083B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4560951A (en) * | 1983-02-17 | 1985-12-24 | Siemens Aktiengesellschaft | Voltage-controlled oscillator with surface-wave transmission line |
| US4581592A (en) * | 1983-05-03 | 1986-04-08 | R F Monolithics, Inc. | Saw stabilized oscillator with controlled pull-range |
| US5329256A (en) * | 1993-06-30 | 1994-07-12 | Motorola, Inc. | Tunable oscillator having a non-reflective saw resonator |
| TW349292B (en) * | 1996-02-14 | 1999-01-01 | Rf Monolithics | Feedback oscillator circuit using a saw resonator filter |
| CN102761316A (en) * | 2007-11-29 | 2012-10-31 | Nlt科技股份有限公司 | Delay element, variable delay line, and voltage controlled oscillator, as well as display device and system comprising the same |
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| CN110719083A (en) | 2020-01-21 |
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