TWI627643B - Variable inductor - Google Patents

Abstract

A variable inductor for connecting a first external component and a second external component, the variable inductor comprising: a main conductor having a first node and a second node, the first node Connecting the first external component, the second node is for connecting the second external component; a first secondary conductor is magnetically coupled to the main conductor; a first switch is connected to the first time on both sides thereof a stage conductor; wherein the first secondary conductor forms a single loop structure having two variable current paths that are operated by the state of the first switch. Thereby, by using the magnetic field coupling principle, the main signal does not pass through the lossy switch, so as to prepare a variable inductor with a large adjustable range of values and a large adjustable value.

Description

Variable inductor

This invention relates to an inductor, and more particularly to a variable inductor for use in a radio frequency circuit or multi-band circuit design.

In the development of the past few decades, the integrated circuit has become a complete industrial structure of the upper, middle and lower reaches, and its production technology is the origin of modern micro-production technology, whether it is integrated circuit, MEMS, optoelectronic technology, communication. The production of technology and other products is related to the micro-fabrication technology of integrated circuits. At the same time, with the integration of circuit processing technology, such as wireless communication, network connection, computing, etc., the technology of manufacturing RF integrated circuits (RFIC) has also developed. This enables smaller, smaller, lower cost RF integrated circuits to be continuously manufactured.

In the prior art, many circuits use reactive components such as containers and inductors. In some applications, a reactive component must be changed within a specific range. Conventionally, a set of inductors is often used to turn on the A suitable combination of inductors or inductors in the group is used to obtain different inductance values, but such a design must occupy a considerable amount of space, and its conversion cost is high, and the series coupled switches can reduce the performance of the inductor.

Therefore, there is a great need in the industry to develop a variable inductor that can be used in RF circuit or multi-band circuit design. Reason, changing the equivalent inductance and coupling factor of the secondary coil, so that the inductance of the main coil changes, and the effect of the variable inductance is achieved, so that the existing adjustable inductance can be improved, and the adjustable range of the inductance value is small, and the analysis is small. The problem is low degree, poor durability, and severe bias problems, so as to prepare a variable inductor with a large range of adjustable inductance values and a large adjustable value.

In view of the above disadvantages of the prior art, the main object of the present invention is to provide a variable inductor that integrates a main conductor, a first secondary conductor, a first switch, etc., to prepare a wide range of adjustable inductance values. A variable inductor with a large adjustable value.

In order to achieve the above object, according to one aspect of the present invention, a variable inductor is provided for connecting a first external component and a second external component, the variable inductor comprising: a main conductor having a first node for connecting the first external component, the second node for connecting the second external component; a first secondary conductor magnetically coupled to the primary conductor; a first switch having two sides connected to the first secondary conductor; wherein the first secondary conductor forms a single loop structure having two variable current paths, the two variable current paths being by the first switch State operation.

The medium variable inductor further includes a second switch, two sides of the second switch are respectively connected to the first secondary conductor, and the first secondary conductor is formed as a single with four variable current paths Loop structure, the four variables The current path is operated by the states of the first and second switches.

The present invention also includes a third switch having two sides connected to the first secondary conductor, respectively, and the first secondary conductor is formed as a single loop structure having eight variable current paths, the eight The variable current path is operated by the states of the first, second, and third switches.

The variable inductor of the present invention further includes: a second secondary conductor magnetically coupled to the main conductor; a fourth switch connected to the second secondary conductor on both sides; wherein the second secondary conductor A single loop structure is formed having two variable current paths that are operated by the state of the fourth switch.

In the above, a fifth switch is further included, the two sides of the fifth switch are respectively connected to the second secondary conductor, and the second secondary conductor is formed as a single-loop structure having four variable current paths, and the fourth The variable current paths are operated by the states of the fourth and fifth switches.

The variable inductor of the present invention further includes a sixth switch, the two sides of the sixth switch being respectively connected to the second secondary conductor, and the second secondary conductor being formed to have eight variable current paths a single loop configuration, the eight variable current paths being operated by states of the fourth, fifth and sixth switches; wherein the first secondary conductor is disposed on one side of the primary conductor and the second secondary a conductor disposed on the other side of the primary conductor; wherein the first node is disposed at one end of the primary conductor, the second node is disposed at another end of the primary conductor; wherein the variable inductor is integrated in a radio frequency Integrated circuit; The first switch is implemented by a CMOS (Complementary Metal Oxide Semiconductor) or PCB (Printed Circuit Board) block assembly.

The above summary and the following detailed description and drawings are intended to further illustrate the manner, means and effects of the present invention in achieving its intended purpose. Other purposes and advantages of this creation will be explained in the following description and drawings.

210‧‧‧Main conductor

220‧‧‧First secondary conductor

240‧‧‧Printed circuit board

230‧‧‧Second secondary conductor

S1‧‧‧ first switch

S2‧‧‧ second switch

S3‧‧‧ third switch

S4‧‧‧fourth switch

S5‧‧‧ fifth switch

S6‧‧‧ sixth switch

N1‧‧‧ first node

N2‧‧‧ second node

1 is a schematic structural view of a variable inductor of the present invention;

The embodiments of the present invention are described by way of specific examples, and those skilled in the art can readily understand the advantages and effects of the present invention from the disclosure of the present disclosure.

Please refer to FIG. 1 , which is a schematic structural view of a variable inductor according to the present invention. As shown, the structure includes a main conductor 210 , a first secondary conductor 220 , a second secondary conductor 230 , and a first switch S1 . a second switch S2, a third switch S3, and a fourth switch S4. The main conductor 210 has a first node N1 and a second node N2. The second secondary conductor 230 is magnetically coupled to the main conductor 210. The fourth switch S4 is in a state of operating the two variable current paths. The structure includes a fifth switch S5 and a sixth switch S6. The fifth switch S5 and the sixth switch S6 and the fifth switch S5 are formed with four Single-loop structure of variable current path, the sixth switch S6 is formed to have eight variable current paths The single-loop structure performs the four variable current path operations through the fourth switch S4 and the fifth switch S5; and performs eight variable current path operations through the fourth switch S4, the fifth switch S5, and the sixth switch S3, wherein The above switch structure is implemented by a CMOS (not shown) or printed circuit board 240 (PCB) block assembly.

The above-described embodiments are merely illustrative of the features and functions of the present invention and are not intended to limit the scope of the technical content of the present invention. Any person skilled in the art can modify and change the above embodiments without departing from the spirit and scope of the creation. Therefore, the scope of protection of this creation should be as listed in the scope of the patent application described later.

Claims (7)

A variable inductor for connecting a first external component and a second external component, the variable inductor comprising: a main conductor having a first node and a second node, the first node Connecting the first external component, the second node is for connecting the second external component; a first secondary conductor is magnetically coupled to the primary conductor; a second secondary conductor is magnetically coupled to the primary conductor; a first switch having two sides connected to the first secondary conductor; a second switch connected to the first secondary conductor on both sides; and a third switch connected to the first side on the two sides a fourth switch having two sides connected to the second secondary conductor; wherein the first secondary conductor forms a single loop structure having eight variable current paths, the eight variable current paths being The states of the first, second, and third switches operate to form a single loop structure having two variable current paths that are operated by the state of the fourth switch. The variable inductor of claim 1, further comprising a fifth switch, the two sides of the fifth switch are respectively connected to the second secondary conductor, and the second secondary conductor is formed to have A single loop configuration of four variable current paths that are operated by the states of the fourth and fifth switches. The variable inductor of claim 2, further comprising a sixth switch, two sides of the sixth switch are respectively connected to the second secondary conductor, and the second secondary conductor is formed to have A single loop configuration of eight variable current paths that are operated by the states of the fourth, fifth, and sixth switches. The variable inductor of claim 3, wherein the first secondary conductor is disposed on one side of the primary conductor and the second secondary conductor is disposed on the other side of the primary conductor . The variable inductor of claim 4, further comprising a fifth switch, the two sides of the fifth switch are respectively connected to the second secondary conductor, and the second secondary conductor is formed to have A single loop configuration of four variable current paths that are operated by the states of the fourth and fifth switches. The variable inductor of claim 5, further comprising a sixth switch, two sides of the sixth switch are respectively connected to the second secondary conductor, and the second secondary conductor is formed to have A single loop configuration of eight variable current paths that are operated by the states of the fourth, fifth, and sixth switches. The variable inductor of claim 6, wherein the first secondary conductor is disposed on one side of the primary conductor and the second secondary conductor is disposed on the other side of the primary conductor .