CN111383826A - Inductance device and control method thereof - Google Patents

Abstract

An inductance device comprises a splayed inductor and a ring coil, wherein the ring coil is arranged around the periphery of the splayed inductor. The splayed inductor comprises an input end and a central tap end, wherein the input end of the splayed inductor is positioned on the first side of the inductor device, and the central tap end is positioned on the second side of the inductor device. The annular coil comprises an input end and a grounding end, the input end of the annular coil is positioned on the first side of the inductance device, and the grounding end is positioned on the second side of the inductance device. The input end of the annular coil is coupled to the input end of the splayed inductor.

Description

Inductive device and control method thereof

technical field

The present case relates to an electronic device and method, and in particular, to an inductive device and a control method thereof.

Background technique

In a direct-up transmitter (direct-up transmitter), if the frequency of the voltage-controlled oscillator (VoltageConreolled Oscillator, VCO) is selected at the same frequency of the power amplifier (Power Amplifier, PA) even harmonic (even harmonic), the voltage The controlled oscillator may be pulled by the power amplifier, which will deteriorate the communication quality.

The conditions in which the VCO is affected by the power amplifier are divided into "coupling between the inductance of the power amplifier and the inductance of the VCO" and "coupling between the power line of the power amplifier and the power line of the VCO". To solve the above problem, the frequency of the VCO can be set at the non-integer frequency of the harmonics of the power amplifier. However, this configuration requires additional components, which not only occupy the space of the overall device, but also may cause other interference conditions. . In addition, if an algorithm is used for correction, since the voltage-controlled oscillator may have many paths affected by the power amplifier, it is difficult to implement the algorithm.

SUMMARY OF THE INVENTION

SUMMARY The purpose of this summary is to provide a simplified summary of the disclosure to give the reader a basic understanding of the disclosure. This summary is not an exhaustive overview of the disclosure, and it is not intended to identify important/critical components of the present embodiments or to delimit the scope of the present disclosure.

One purpose of the content of this case is to provide a solution to the problems existing in the prior art, and the means of solution are as described later.

In order to achieve the above-mentioned purpose, a technical aspect of the content of the present application relates to an inductance device, the inductance device includes a figure-eight inductor and a toroidal coil, and the toroidal coil is arranged around the periphery of the figure-eight inductance. The figure-eight inductor includes an input terminal and a center tap terminal. The input terminal of the figure-eight type inductor is located on the first side of the inductor device, and the center tap terminal is located on the second side of the inductor device. The toroidal coil includes an input terminal and a ground terminal, the input terminal of the toroidal coil is located on the first side of the inductive device, and the ground terminal is located on the second side of the inductive device. The input end of the toroidal coil is coupled to the input end of the figure-eight inductor.

In order to achieve the above purpose, another technical aspect of the content of the present application relates to a control method of an inductive device. The inductive device includes a figure-eight inductor and a toroidal coil, and the toroidal coil is arranged around the periphery of the figure-eight inductance. The terminal and the input terminal of the toroidal coil are both located on the first side of the inductance device, and the center tap terminal of the figure-of-eight inductor and the ground terminal of the toroidal coil are both located on the second side of the inductive device. The control method includes the following steps: when the interference signal is generated by The center tap end is fed, and the interference signal forms currents on the figure-eight inductor and the toroidal coil respectively, wherein the current on the figure-eight inductance is opposite to the current on the toroidal coil.

Therefore, according to the technical content of this case, the inductance device and the control method thereof shown in the embodiment of this case can change the inductance structure in a limited space, and can effectively reduce the coupling phenomenon between the voltage-controlled oscillator and the power amplifier.

After referring to the following embodiments, a person with ordinary knowledge in the technical field to which this case belongs can easily understand the basic spirit and other inventive purposes of this case, as well as the technical means and implementation forms adopted in this case.

Description of drawings

In order to make the above-mentioned and other purposes, features, advantages and embodiments of this case more obvious and easy to understand, the descriptions of the accompanying drawings are as follows:

FIG. 1 is a schematic diagram illustrating an inductor device according to an embodiment of the present invention.

FIG. 2 is a schematic diagram illustrating the operation of an inductive device according to an embodiment of the present invention.

FIG. 3 is a schematic diagram illustrating the operation of an inductive device according to an embodiment of the present invention.

FIG. 4 is a schematic diagram illustrating the operation of an inductive device according to an embodiment of the present invention.

FIG. 5 is a schematic flowchart illustrating a control method of an inductive device according to an embodiment of the present application.

FIG. 6 is a schematic diagram illustrating experimental data of an inductive device according to an embodiment of the present invention.

In accordance with common practice, the various features and components in the figures are not drawn to scale, but are drawn to best represent the specific features and components relevant to the present case. Furthermore, the same or similar reference numerals are used to refer to similar components/components among the different drawings.

Symbol Description:

100 Inductive Devices

110 Inductive devices

111 Input

113 Center tap end

120 toroid

121 Input

123 Ground terminal

500 method

510-520 steps

600 VCO

C1-C3 experimental curve

I1-I4 current

Ic bus current

In Interference signal

Is Surround Current

T1-T2 transistors

Detailed ways

In order to make the description of the present disclosure more detailed and complete, the following provides an illustrative description for the implementation aspects and specific embodiments of the present case; but this is not the only form of implementing or using the specific embodiments of the present case. The features of various specific embodiments as well as method steps and sequences for constructing and operating these specific embodiments are encompassed in the detailed description. However, other embodiments may also be utilized to achieve the same or equivalent function and sequence of steps.

Unless otherwise defined in this specification, the scientific and technical terms used herein have the same meanings as understood and commonly used by those of ordinary skill in the technical field to which this case belongs. In addition, unless contradicting the context, the singular noun used in this specification covers the plural form of the noun; and the plural noun used also covers the singular form of the noun.

FIG. 1 is a schematic diagram illustrating an inductive device 100 according to an embodiment of the present invention. As shown in the figure, the inductor device 100 includes a figure-of-eight inductor 110 and a toroidal coil 120 . In addition, the figure-of-eight inductor 110 includes an input end 111 and a center tap end 113 , and the toroidal coil 120 includes an input end 121 and a ground end 123 . The crossing in the middle of the figure-eight inductor 110 can be realized by a bridging structure, but the present application is not limited to this.

Structurally, the toroidal coil 120 is disposed around the periphery of the figure-of-eight inductor 110 . However, the present application is not limited to the shape of the toroidal coil 120 shown in FIG. 1 , which is only used to illustrate one implementation manner. In other implementations, the shape of the toroidal coil 120 may also be adjacent to the figure-eight inductor. 110 to present a shape similar to a gourd, or set to other suitable shapes according to actual needs. It should be noted that the figure-eight inductor 110 and the toroidal coil 120 can be disposed on the same metal layer, however, the figure-eight inductor 110 and the toroidal coil 120 can also be disposed on different metal layers according to requirements.

Please continue to refer to FIG. 1 , the center tap terminal 113 of the figure-eight inductor 110 and the ground terminal 123 of the toroidal coil 120 are both located on one side of the inductor device (the upper side in the figure), and the input terminal 111 of the figure-eight inductor 110 is connected to the toroid. The input ends 121 of the coil 120 are all located on the other side of the inductor device (the lower side in the figure).

In one embodiment, the input end 121 of the toroidal coil 120 is coupled to the input end 111 of the figure-of-eight inductor 110 . For example, please refer to FIG. 2 , which is a schematic diagram illustrating the operation of an inductive device 100 according to an embodiment of the present application, which is used to illustrate the differential mode signal of the inductive device 100 by operating current (not shown in the figure). The voltage controlled oscillator (VCO) 600 is controlled, and the oscillating signal generated by the VCO 600 is fed into the input terminal 111 of the figure-of-eight inductor 110 to form a surrounding current Is on the figure-of-eight inductor 110 . The oscillating signal is a sine wave signal, and FIG. 2 shows the flow of the oscillating signal around the current Is in the first half cycle.

Please continue to refer to FIG. 2 , because the current flowing in and out of the node of the input end 111 is equal to the current flowing out. Based on the flow direction of the surrounding current Is, a magnetic field penetrating the drawing will be formed above the figure-8 inductor 110 , and a magnetic field penetrating the drawing will be formed below the figure-8 inductor 110 . The magnetic fields of the two cancel each other out. Therefore, No induced eddy current (eddy current) is formed on the toroidal coil 120, so that the quality factor (Q) of the figure-eight inductor 110 itself is not reduced. In other embodiments, the input terminal 111 of the figure-eight inductor 110 includes a first terminal and a second terminal, and the surrounding current Is can be fed from the first terminal on the left side of the figure, and flows around the figure-eight type inductor 110, and then shown in the figure The second end on the right side of the center flows out.

In one embodiment, the distance between the figure-eight inductor 110 and the toroidal coil 120 is less than about 1 to 5 times the inductance line width of the figure-eight inductor 110 . However, this case is not limited to this, and the above distance can be configured as an appropriate multiple of the inductor line width according to actual needs.

In another embodiment, the input end 121 of the toroidal coil 120 is coupled to the input end 111 of the figure-of-eight inductor 110 . For example, please refer to FIG. 3 , which is a schematic diagram illustrating the operation of an inductive device 100 according to an embodiment of the present application, which is used to illustrate the common mode signal of the inductive device 100 , the input end 121 of the toroidal coil 120 It is coupled to the input end 111 of the figure-eight inductor 110 . At this time, when an interference signal In is fed from the center tap terminal 113 , the interference signal In forms a current on the figure-eight inductance 110 and the toroidal coil 120 respectively. The interference signal In may be coupled into the figure-eight inductor 110 from a power amplifier (PA) (not shown in the figure), but the present application is not limited to this. As shown in FIG. 3 , the current of the interference signal In on the figure-of-eight inductor 110 is opposite to the current on the toroidal coil 120 . In one embodiment, the interference signal In includes noise current (Inoise), but the present application is not limited to this.

Please continue to refer to FIG. 3 , the interference signal In forms the first current I1 and the second current I2 on opposite sides of the figure-of-eight inductor 110 . As shown in the figure, both the first current I1 and the second current I2 flow from the second side (eg, the upper side in the figure) to the first side (eg, the lower side in the figure) of the inductive device 100 . The first current I1 and the second current I2 are combined at the input end 111 of the figure-of-eight inductor 110 to form a combined current Ic. Then, the bus current Ic is fed from the input end 121 of the toroidal coil 120, and the third current I3 and the fourth current I4 are formed on the opposite sides of the toroidal coil 120, and the third current I3 and the fourth current I4 are both driven by the inductor The first side (eg, the lower side in the figure) of the device 100 flows to the ground terminal 123 on the second side (eg, the upper side in the figure). It can be seen from this that the currents I1 and I2 on the figure-of-eight inductor 110 flow from the second side of the inductor device 100 to the first side, while the currents I3 and I4 on the toroidal coil 120 flow from the second side of the inductor device 100 to the first side; Therefore, the current in the figure-8 inductor 110 is opposite to the current in the toroidal coil 120 , so that the magnetic field induced by the current in the figure-8 inductor 110 and the magnetic field induced by the current in the toroidal coil 120 cancel each other out.

FIG. 4 is a schematic diagram illustrating the operation of an inductive device 100 according to an embodiment of the present invention. As shown in the figure, since the figure-eight type inductor 110 is used in this case, because the magnetic field of the figure-eight type inductor 110 cancels out, compared with the symmetrical type inductance, the difference between the power amplifier (not shown in the figure) and the voltage-controlled oscillator 600 can be additionally improved. isolation. The coupling between the power line of the power amplifier and the power line of the VCO 600 is a common mode signal for the VCO 600 . The signal of the power amplifier is a signal carrying modulation data. Therefore, if the voltage-controlled oscillator 600 operates at the even harmonic frequency of the power amplifier, the modulation signal is a common-mode interference signal In for the voltage-controlled oscillator 600 . .

Please continue to refer to FIG. 4. In this embodiment, the VCO 600 includes cross-coupled transistors T1, T2 and capacitors, wherein the transistors T1 and T2 may be N-type metal oxide semiconductor field effect transistors (NMOS FETs), P-type Metal Oxide Semiconductor Field Effect Transistor (PMOS FET) or Complementary Metal Oxide Semiconductor Field Effect Transistor (CMOS FET), this case is not limited to this. In one implementation, the transistor T1 includes a first terminal, a first control terminal and a second terminal. The first terminal is coupled to the input terminal 111 of the figure-eight inductor 110 , and the second terminal is coupled to the input terminal of the loop coil 120 . 121. The transistor T2 includes a third terminal, a second control terminal and a fourth terminal, the third terminal is coupled to the input terminal 111 of the figure-eight inductor 110 and the first control terminal of the transistor T1, and the second control terminal is coupled to the transistor T1 The first end of the loop coil 120 is coupled to the input end 121 of the fourth end of the loop coil 120 . The capacitor is coupled between the first end of the transistor T1 and the third end of the transistor T2.

When the transistors T1 and T2 are turned on at the same time and the waveform of the VCO 600 passes through the zero-crossing point, the VCO 600 is most easily disturbed by noise. In this case, a single-turn figure-of-eight inductor 110 is used, and the toroidal coil 120 surrounding the common-mode signal flow path can effectively reduce the common-mode inductance value to L(1-m), where m is the coupling coefficient of the inductor. When the waveform of the voltage-controlled oscillator 600 is close to the zero-crossing point, it is also the state most easily disturbed by the common mode signal. At this time, the transistors T1 and T2 are turned on at the same time, and the common mode interference signal In is evenly distributed into two channels, and the Returning to the ground terminal 123, the common-mode inductance value can be reduced by L(1-m), and the degree of pulling the voltage-controlled oscillator by the power amplifier can be improved.

FIG. 5 is a schematic flowchart of a control method 500 of an inductive device according to an embodiment of the present invention. As shown in the figure, the control method 500 of the inductive device includes the following steps:

Step 510 : When the interference signal is fed from the center tap terminal, the interference signal forms currents on the figure-eight inductor and the toroidal coil respectively, wherein the current on the figure-of-eight inductor is opposite to the current on the toroidal coil.

Step 520: When the oscillating signal is fed from the input end of the figure-eight inductor, the oscillating signal forms a surrounding current on the figure-eight inductor.

For easy understanding of the control method 500 of the inductive device, please refer to FIGS. 2 , 3 and 5 together. In step 510 , when the interference signal In is fed from the center tap terminal 113 , the interference signal In forms currents on the figure-of-eight inductor 110 and the toroidal coil 120 respectively, and the current on the figure-of-eight inductor 110 is opposite to the current on the toroidal coil 120 . Towards. In one embodiment, the interference signal In includes a noise current (I _noise ), but the present application is not limited to this.

In step 520 , when the oscillating signal of the voltage-controlled oscillator 600 is fed from the input terminal 111 of the figure-of-eight inductor 110 , the oscillating signal forms a surrounding current Is on the figure-of-eight inductor 110 .

In one embodiment, the step of forming currents on the figure-eight inductor 110 and the toroidal coil 120 according to the interference signal In includes: forming a first current I1 and a second current on opposite sides of the figure-8 inductor 110 according to the interference signal In I2, wherein the first current I1 and the second current I2 both flow from the second side of the inductance device 100 to the first side; and the first current I1 and the second current I2 are combined at the input end 111 of the figure-eight inductor 110 to form a combined current Ic .

In one embodiment, the step of forming currents on the figure-eight inductor 110 and the loop coil 120 according to the interference signal In includes: forming a third current I3 and a fourth current I4 on opposite sides of the loop coil 120 according to the bus current Ic , wherein the third current I3 and the fourth current I4 both flow from the first side of the inductance device 100 to the second side.

In one embodiment, the surrounding current Is only surrounds the figure-eight inductor 110 . In another embodiment, the input terminal 111 of the figure-eight inductor 110 includes a first terminal and a second terminal, wherein the surrounding current Is is fed into the figure-eight inductor 110 from the first terminal and flows around the figure-eight inductor 110 and flows out from the second terminal. In other embodiments, the interference signal In is a common mode signal, and the oscillation signal is a differential mode signal.

FIG. 6 is a schematic diagram illustrating experimental data of an inductive device 100 according to an embodiment of the present invention. As shown in the figure, when the VCO 600 is not disturbed, its experimental curve is C1. Taking the frequency of 100.0 kHz as an example, the phase noise at this time is -90.39 dBc/Hz. When a high-frequency noise is fed into the inductance device 100 without the toroidal coil 120 of the present application, the experimental curve is C3. Also taking 100.0 kHz as an example, the phase noise at this time is increased to -71.83 dBc/Hz. However, once the inductance device 100 with the toroidal coil 120 of the present application is used, the experimental curve is C2. Also taking 100.0 kHz as an example, the phase noise at this time is reduced to -86.07 dBc/Hz. The inductance device 100 of the toroidal coil 120 of the present application can indeed effectively reduce the interference to the voltage-controlled oscillator 600 .

It can be seen from the above embodiments of the present case that the application of the present case has the following advantages. The inductance device and the control method thereof shown in the embodiment of the present application can change the inductance structure in a limited space, and can effectively reduce the coupling phenomenon between the voltage-controlled oscillator and the power amplifier.

Although the above embodiments disclose specific examples of this case, they are not intended to limit this case. Those with ordinary knowledge in the technical field to which this case belongs can, without departing from the principles and spirit of this case, carry out Various changes and modifications, therefore, the scope of protection in this case should be defined by the scope of the patent application attached hereto.

Claims (10)

1. An inductive device comprising: A figure-of-eight inductor, including: an input terminal on a first side of the inductive device; and a center tap terminal on a second side of the inductive device; and A toroidal coil, arranged around the periphery of the figure-eight inductor, includes: an input terminal on the first side of the inductive device; and a ground terminal located on the second side of the inductive device; Wherein the input end of the toroidal coil is coupled to the input end of the figure-eight inductor. 2 . The inductor device of claim 1 , wherein the input end of the loop coil is coupled to the input end of the figure-eight inductor through an oscillator. 3 . 3. The inductance device of claim 2, wherein when an interference signal is fed from the center tap terminal, the interference signal forms currents on the figure-eight inductor and the toroidal coil respectively, wherein the current on the figure-eight inductance Opposite of the current on the toroid. 4. The inductance device of claim 3, wherein the interference signal forms a first current and a second current on opposite sides of the figure-of-eight inductor, wherein both the first current and the second current are generated by the The second side of the inductor device flows to the first side, and the first current and the second current are combined at the input end of the figure-eight inductor to form a combined current, wherein the combined current is fed by the input end of the toroidal coil. A third current and a fourth current are formed on opposite sides of the loop coil, and both the third current and the fourth current flow from the first side to the second side of the inductance device. 5 . The inductor device of claim 3 , wherein when an oscillating signal is fed from the input end of the figure-eight inductor, the oscillating signal forms a surrounding current on the figure-eight inductor. 6 . 6. The inductance device of claim 5, wherein the surrounding current only flows around the figure-8 inductor, wherein the input end of the figure-8 inductor comprises a first terminal and a second terminal, and the surrounding current is generated by the The first end feeds into and flows around the figure-eight inductor, and flows out from the second end of the input end. 7 . The inductance device according to claim 1 , wherein the distance between the figure-eight inductor and the toroidal coil is smaller than 1 to 5 times the inductance line width of the figure-eight inductor. 8 . 8. The inductive device according to any one of claims 5 to 6, wherein the interference signal is a common mode signal, and the oscillation signal is a differential mode signal. 9 . The inductor device of claim 1 , wherein the figure-eight inductor and the toroidal coil are disposed on the same metal layer, or the figure-eight inductor and the toroidal coil are disposed on different metal layers. 10 . 10. A control method for an inductive device, wherein the inductive device comprises a figure-eight inductor and a toroidal coil, the toroidal coil is arranged around the periphery of the figure-eight inductance, wherein an input end of the figure-eight inductance is connected to the toroidal coil An input end of the inductance device is located on a first side of the inductance device, and a center tap end of the figure-of-eight inductor and a ground end of the toroidal coil are located on a second side of the inductance device, wherein the control method includes: When an interference signal is fed from the center tap terminal, the interference signal forms currents on the figure-eight inductor and the toroidal coil respectively, wherein the current on the figure-eight inductance is opposite to the current on the toroid.

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