CN112671343A - Voltage controlled oscillator - Google Patents
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- CN112671343A CN112671343A CN202011566001.4A CN202011566001A CN112671343A CN 112671343 A CN112671343 A CN 112671343A CN 202011566001 A CN202011566001 A CN 202011566001A CN 112671343 A CN112671343 A CN 112671343A
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Abstract
Disclosed herein is a voltage controlled oscillator including: more than two voltage-controlled oscillation cores are bridged on the three-coil transformer with the closed structure; the voltage-controlled oscillation core comprises two transistors which are arranged in parallel at a bridging position respectively; the source end and the drain end of the first transistor are respectively connected with a first coil and a second coil of the three-coil transformer on the first side of the bridging position, and the grid end of the first transistor is connected with a third coil on the second side of the bridging position; a source end and a drain end of the second transistor are respectively connected with the first coil and the second coil on the second side of the bridging position, and a grid end is connected with the third coil on the first side of the bridging position; and a third coil between adjacent voltage-controlled oscillation cores is strongly coupled with the second coil, the first coil is weakly coupled with the third coil, and the first coil is weakly coupled with the second coil. The embodiment of the invention realizes the voltage-controlled oscillator applicable to millimeter waves based on the small inductance design of the three-coil transformer, and provides hardware support for realizing high-purity local oscillation signals.
Description
Technical Field
The present disclosure relates to, but not limited to, radio frequency communication technologies, and more particularly, to a voltage controlled oscillator.
Background
The millimeter wave band is widely applied to communication systems such as radars, fifth generation mobile communication technology (5G) and the like. Taking 5G communication as an example, since the 5G communication adopts a complex digital modulation method, there is a high requirement for the purity of the millimeter wave local oscillation signal, and a local oscillation signal with poor purity may cause an increase in the communication error rate. The purity of the millimeter wave local oscillation signal can be improved by adopting a frequency doubling scheme, but extra power consumption is consumed to amplify weak harmonic components; therefore, in 5G communication, there is a strong demand for a high-purity millimeter wave voltage-controlled oscillator in order to obtain a high-purity local oscillation signal.
Currently, the purity of a millimeter wave voltage-controlled oscillator is limited by the quality factor of the inductor on the millimeter wave band chip, and therefore, it is difficult to realize a small inductor with a high quality factor on the chip.
Disclosure of Invention
The following is a summary of the subject matter described in detail herein. This summary is not intended to limit the scope of the claims.
The embodiment of the invention provides a voltage-controlled oscillator, which can realize a voltage-controlled oscillator applicable to millimeter waves and provide hardware support for providing high-purity local oscillation signals.
An embodiment of the present invention provides a voltage controlled oscillator, including: more than two voltage-controlled oscillation cores are bridged on the three-coil transformer with the closed structure; wherein the content of the first and second substances,
the voltage-controlled oscillation core comprises two transistors which are arranged on two sides of the bridging position in parallel; wherein the content of the first and second substances,
the source end and the drain end of the first transistor are connected with the first coil and the second coil of the three-coil transformer on the first side of the bridging position, and the grid end of the first transistor is connected with the third coil of the three-coil transformer on the second side of the bridging position; the source end and the drain end of the second transistor are connected with the first coil and the second coil of the three-coil transformer on the second side of the bridging position, and the grid end of the second transistor is connected with the third coil of the three-coil transformer on the first side of the bridging position;
and a third coil between adjacent voltage-controlled oscillation cores is strongly coupled with the second coil, the first coil is weakly coupled with the third coil, and the first coil is weakly coupled with the second coil.
In one exemplary embodiment, drain terminals of the first transistor and the second transistor are connected through a first variable capacitor.
In one exemplary embodiment:
the source ends of the first transistor and the second transistor are connected through a second variable capacitor; and/or the presence of a gas in the gas,
and the grid ends of the first transistor and the second transistor are connected through a third variable capacitor.
In one exemplary embodiment:
the center virtual point of the second coil between the adjacent voltage-controlled oscillation cores is connected with a first port of a power supply;
the center virtual place of the third coil between the adjacent voltage-controlled oscillation cores is connected with a second port of the power supply through a preset resistor;
the center virtual ground of the first coil between the adjacent voltage-controlled oscillation cores is grounded.
In an exemplary embodiment, the closure structure comprises: a closed configuration of a centrosymmetric polygon.
In an exemplary embodiment, the closure structure comprises: a closed configuration of centrosymmetric octagons.
In an exemplary embodiment, the number of the voltage-controlled oscillation cores included in the voltage-controlled oscillator is four.
In an exemplary embodiment, four voltage-controlled oscillation cores are uniformly distributed in four directions of the octagonal structure.
The application includes: more than two voltage-controlled oscillation cores are bridged on the three-coil transformer with the closed structure; the voltage-controlled oscillation core comprises two transistors which are arranged in parallel at a bridging position respectively; in the two transistors, a source end and a drain end of a first transistor are respectively connected with a first coil and a second coil of a three-coil transformer on a first side of a bridging position, and a grid end of the first transistor is connected with a third coil on a second side of the bridging position; the source end and the drain end of the second transistor are respectively connected with the first coil and the second coil on the second side of the bridging position, and the grid end of the second transistor is connected with the third coil on the first side of the bridging position; and a third coil between adjacent voltage-controlled oscillation cores is strongly coupled with the second coil, the first coil is weakly coupled with the third coil, and the first coil is weakly coupled with the second coil. The embodiment of the invention realizes the voltage-controlled oscillator applicable to millimeter waves based on the small inductance design of the three-coil transformer, and provides hardware support for realizing high-purity local oscillation signals.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the example serve to explain the principles of the invention and not to limit the invention.
Fig. 1 is a block diagram of a voltage controlled oscillator according to an embodiment of the present invention;
fig. 2 is a schematic circuit diagram of another voltage controlled oscillator according to an embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without conflict.
The steps illustrated in the flow charts of the figures may be performed in a computer system such as a set of computer-executable instructions. Also, while a logical order is shown in the flow diagrams, in some cases, the steps shown or described may be performed in an order different than here.
Fig. 1 is a block diagram of a voltage-controlled oscillator according to an embodiment of the present invention, as shown in fig. 1, including: more than two voltage-controlled oscillation cores which are bridged on the three-coil transformer with the closed structure according to preset distribution (in the figure, the octagon three-coil transformer comprises four bridged voltage-controlled oscillation cores as an illustration); wherein the content of the first and second substances,
the voltage-controlled oscillation core comprises two transistors which are arranged on two sides of the bridging position in parallel; wherein the content of the first and second substances,
the source end and the drain end of the first transistor are connected with the first coil and the second coil of the three-coil transformer on the first side of the bridging position, and the grid end of the first transistor is connected with the third coil of the three-coil transformer on the second side of the bridging position; the source end and the drain end of the second transistor are connected with the first coil and the second coil of the three-coil transformer on the second side of the bridging position, and the grid end of the second transistor is connected with the third coil of the three-coil transformer on the first side of the bridging position;
and a third coil between adjacent voltage-controlled oscillation cores is strongly coupled with the second coil, the first coil is weakly coupled with the third coil, and the first coil is weakly coupled with the second coil.
It should be noted that, in the embodiment of the present invention, a voltage-controlled oscillator including two or more voltage-controlled oscillation cores may be understood as a multi-core voltage-controlled oscillator (Mutli-core VCO), which refers to an oscillator including a plurality of voltage-controlled oscillation units.
The application includes: more than two voltage-controlled oscillation cores are bridged on the three-coil transformer with the closed structure; the voltage-controlled oscillation core comprises two transistors which are arranged in parallel at a bridging position respectively; in the two transistors, a source end and a drain end of a first transistor are respectively connected with a first coil and a second coil of a three-coil transformer on a first side of a bridging position, and a grid end of the first transistor is connected with a third coil on a second side of the bridging position; the source end and the drain end of the second transistor are respectively connected with the first coil and the second coil on the second side of the bridging position, and the grid end of the second transistor is connected with the third coil on the first side of the bridging position; and a third coil between adjacent voltage-controlled oscillation cores is strongly coupled with the second coil, the first coil is weakly coupled with the third coil, and the first coil is weakly coupled with the second coil. The embodiment of the invention realizes the voltage-controlled oscillator applicable to millimeter waves based on the small inductance design of the three-coil transformer, and provides hardware support for realizing high-purity local oscillation signals.
It should be noted that the strong coupling and the weak coupling between the coils can be adjusted by adjusting the length of the coils and/or the center distance of the coils with interaction, and the coupling strength between the coils can be determined in a simulation manner. In addition, the coils of the three-coil transformer connected with the gate terminal, the source terminal and the drain terminal can be set by a person skilled in the art according to the relevant principle, and when different connection modes are set, the required local oscillation signals can be obtained through parameter adjustment.
In an exemplary embodiment, the drain terminals of the first transistor and the second transistor are connected by a first variable capacitor.
The source ends of the first transistor and the second transistor are connected through a second variable capacitor; and/or the presence of a gas in the gas,
the gate terminals of the first transistor and the second transistor are connected through a third variable capacitor.
According to the embodiment of the invention, the source ends of the first transistor and the second transistor are connected through the second variable capacitor, so that the adjustment precision of the voltage-controlled oscillator is improved. In a similar way, the grid ends of the first transistor and the second transistor are connected through the third variable capacitor, so that the adjusting precision of the voltage-controlled oscillator is improved.
The embodiment of the invention forms a virtual ground point at the center position of the adjacent voltage-controlled oscillator of the three-coil transformer.
In one illustrative example, embodiments of the invention:
the center virtual point of the second coil between the adjacent voltage-controlled oscillation cores is connected with the first port of the power supply; the center virtual point of a third coil between the adjacent voltage-controlled oscillation cores is connected with a second port of the power supply through a preset resistor; the center virtual ground of the first coil between the adjacent voltage-controlled oscillation cores is grounded.
It should be noted that, in the embodiment of the present invention, two or more oscillator cores are connected to the same voltage source during operation, and parameters of the voltage source may be determined by a person skilled in the art according to parameters of local oscillation signals that need to be generated.
In one illustrative example, a three-coil transformer of an embodiment of the present invention includes: the three-coil transformer is a closed structure and has a polygonal shape with a symmetrical center.
In an illustrative example, a centrosymmetric polygon in an embodiment of the present invention may include, but is not limited to: equilateral triangles, squares, and other centrosymmetric polygons with a greater number of sides.
It should be noted that, in theory, the three-coil transformation may also be a closed structure of a non-centrosymmetric polygon, and the closed structure of the centrosymmetric polygon is more suitable for the application design and the product production process.
In one exemplary embodiment, a closure structure of an embodiment of the present invention includes: a closed configuration of centrosymmetric octagons.
In an exemplary embodiment, the number of voltage controlled oscillation cores included in the voltage controlled oscillator according to the embodiment of the present invention is four.
In one exemplary embodiment, four voltage-controlled oscillation cores are uniformly distributed in four directions of an octagonal structure.
In an exemplary example, the voltage-controlled oscillator according to the embodiment of the present invention may be applied to a scene of a local oscillator signal at a millimeter wave level.
Fig. 2 is a schematic diagram of a circuit configuration of another voltage-controlled oscillator according to an embodiment of the present invention, and as shown in fig. 2, four oscillator cores are uniformly bridged in four directions of an octagonal three-coil transformer, and adjacent oscillator cores are connected through a gate terminal, a source terminal, and a drain terminal of a transistor; and a voltage source is connected between two adjacent oscillator cores.
According to the embodiment of the invention, the voltage-controlled oscillator can have small inductance with high quality factor by using the coil design of the three-coil transformer. The voltage-controlled oscillator is realized based on the design of a three-coil transformer, the coupling of the first coil and the second coil is fed back to the source end of the transistor, the amplitude of a voltage-controlled oscillation signal is improved, and the phase noise is reduced, so that the purity of a local oscillation signal is improved. In addition, when the number of the voltage-controlled oscillation cores is increased, the phase noise is optimized correspondingly, and the phase noise can be optimized by 3 decibels (db) by taking 4 voltage-controlled oscillation cores to be increased to 8 voltage-controlled oscillation cores as an example.
"one of ordinary skill in the art will appreciate that all or some of the steps of the methods, systems, functional modules/units in the devices disclosed above may be implemented as software, firmware, hardware, and suitable combinations thereof. In a hardware implementation, the division between functional modules/units mentioned in the above description does not necessarily correspond to the division of physical components; for example, one physical component may have multiple functions, or one function or step may be performed by several physical components in cooperation. Some or all of the components may be implemented as software executed by a processor, such as a digital signal processor or microprocessor, or as hardware, or as an integrated circuit, such as an application specific integrated circuit. Such software may be distributed on computer readable media, which may include computer storage media (or non-transitory media) and communication media (or transitory media). The term computer storage media includes volatile and nonvolatile, removable and non-removable media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data, as is well known to those of ordinary skill in the art. Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, Digital Versatile Disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other medium which can be used to store the desired information and which can accessed by a computer. In addition, communication media typically embodies computer readable instructions, data structures, program modules or other data in a modulated data signal such as a carrier wave or other transport mechanism and includes any information delivery media as known to those skilled in the art. "
Claims (8)
1. A voltage controlled oscillator comprising: more than two voltage-controlled oscillation cores are bridged on the three-coil transformer with the closed structure; wherein the content of the first and second substances,
the voltage-controlled oscillation core comprises two transistors which are arranged on two sides of the bridging position in parallel; wherein the content of the first and second substances,
the source end and the drain end of the first transistor are connected with the first coil and the second coil of the three-coil transformer on the first side of the bridging position, and the grid end of the first transistor is connected with the third coil of the three-coil transformer on the second side of the bridging position; the source end and the drain end of the second transistor are connected with the first coil and the second coil of the three-coil transformer on the second side of the bridging position, and the grid end of the second transistor is connected with the third coil of the three-coil transformer on the first side of the bridging position;
and a third coil between adjacent voltage-controlled oscillation cores is strongly coupled with the second coil, the first coil is weakly coupled with the third coil, and the first coil is weakly coupled with the second coil.
2. The voltage controlled oscillator of claim 1, wherein drain terminals of the first transistor and the second transistor are connected by a first variable capacitance.
3. The voltage controlled oscillator of claim 2, wherein:
the source ends of the first transistor and the second transistor are connected through a second variable capacitor; and/or the presence of a gas in the gas,
and the grid ends of the first transistor and the second transistor are connected through a third variable capacitor.
4. The method of claim 1, wherein:
the center virtual point of the second coil between the adjacent voltage-controlled oscillation cores is connected with a first port of a power supply;
the center virtual place of the third coil between the adjacent voltage-controlled oscillation cores is connected with a second port of the power supply through a preset resistor;
the center virtual ground of the first coil between the adjacent voltage-controlled oscillation cores is grounded.
5. The voltage controlled oscillator of claim 1, wherein the closed structure comprises: a closed configuration of a centrosymmetric polygon.
6. The voltage controlled oscillator of claims 1 to 5, wherein the closed structure comprises: a closed configuration of centrosymmetric octagons.
7. The VCO according to claim 6, wherein the number of said VCO cores included in said VCO is four.
8. The VCO according to claim 7, wherein said four voltage controlled oscillator cores are uniformly distributed in four directions in said octagonal structure.
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| CN202011566001.4A CN112671343A (en) | 2020-12-25 | 2020-12-25 | Voltage controlled oscillator |
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|---|---|---|---|---|
| US20090184774A1 (en) * | 2008-01-17 | 2009-07-23 | National Taiwan University | Transistor voltage-controlled oscillator |
| US20150214891A1 (en) * | 2014-01-30 | 2015-07-30 | Qualcomm Incorporated | Transformer feedback voltage controlled oscillator (vco) |
| EP3109935A1 (en) * | 2015-06-26 | 2016-12-28 | IMEC vzw | Coupling element for differential hybrid coupler |
| US20180269833A1 (en) * | 2017-03-16 | 2018-09-20 | Infineon Technologies Ag | System and method for a dual-core vco |
| US20200136556A1 (en) * | 2018-06-29 | 2020-04-30 | Taiwan Semiconductor Manufacturing Company, Ltd. | Oscillator circuit, device, and method |
| CN111342775A (en) * | 2018-12-19 | 2020-06-26 | 天津大学青岛海洋技术研究院 | Dual-core oscillator based on current multiplexing and transformer coupling buffer amplifier |
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- 2020-12-25 CN CN202011566001.4A patent/CN112671343A/en active Pending
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|---|---|---|---|---|
| US20090184774A1 (en) * | 2008-01-17 | 2009-07-23 | National Taiwan University | Transistor voltage-controlled oscillator |
| US20150214891A1 (en) * | 2014-01-30 | 2015-07-30 | Qualcomm Incorporated | Transformer feedback voltage controlled oscillator (vco) |
| CN105940603A (en) * | 2014-01-30 | 2016-09-14 | 高通股份有限公司 | Transformer feedback voltage controlled oscillator (vco) |
| EP3109935A1 (en) * | 2015-06-26 | 2016-12-28 | IMEC vzw | Coupling element for differential hybrid coupler |
| US20180269833A1 (en) * | 2017-03-16 | 2018-09-20 | Infineon Technologies Ag | System and method for a dual-core vco |
| US20200136556A1 (en) * | 2018-06-29 | 2020-04-30 | Taiwan Semiconductor Manufacturing Company, Ltd. | Oscillator circuit, device, and method |
| CN111342775A (en) * | 2018-12-19 | 2020-06-26 | 天津大学青岛海洋技术研究院 | Dual-core oscillator based on current multiplexing and transformer coupling buffer amplifier |
Non-Patent Citations (1)
| Title |
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| 李英男;: "低相噪、低功耗连续调谐双核压控振荡器", 南京大学学报(自然科学), no. 02 * |
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