Spiral inductor having variable inductance
View Patent ↗Disclosed is a spiral inductor formed on a semiconductor substrate. The spiral inductor comprises: a metal line forming a spiral pattern on a substrate using conductors having different widths and having open or short-type stubs at one side of each of the conductors; and switching means connection-controlled in accordance with a selection signal for adjusting an inductance and selectively connecting the conductors of the different widths of the metal line. According to the invention, the open or short-type stubs may be formed at one sides of each of the conductors, thereby inducing a parasitic capacitance or parasitic inductance. Based on the inducement of the parasitic capacitance or inductance and selectively connection of the conductors to one another through switching means, it is possible to accurately control a whole inductance value of the spiral inductor, depending on use purposes.
1. A spiral inductor formed on a semiconductor, the spiral inductor comprising:
a first conductor and a second conductor arranged in a spiral pattern in a plane form and having different widths from each other;
a stub connected to one side of the first conductor; and
a switch connection-controlled in accordance with a selection signal, the switch to connect the first conductor to the second conductor if the switch is in an on-position,
wherein if the switch is in an off-position, the first conductor and the second conductor are disconnected from each other, and
wherein the stub is an open-type stub arranged to induce a parasitic capacitance by a dielectric between the first conductor and a ground.
2. The spiral inductor according to claim 1 , wherein the switch comprises a Metal Oxide Semiconductor transistor.
3. An integrated circuit comprising the spiral inductor according to claim 1 .
4. A wireless terminal comprising the spiral inductor according to claim 1 .
5. The spiral inductor according to claim 1 , further comprising:
a via contact connected to the first conductor; and
a switching device arranged between the via contact and a ground,
wherein the via contact is connected to ground if the switching device is in an on-position.
6. A spiral inductor formed on a semiconductor, the spiral inductor comprising:
a first conductor and a second conductor arranged in a spiral pattern in a plane form and having different widths from each other;
a stub connected to one side of the first conductor; and
a switch connection-controlled in accordance with a selection signal, the switch to connect the first conductor to the second conductor if the switch is in an on-position,
wherein if the switch is in an off-position, the first conductor and the second conductor are disconnected from each other, and
wherein the stub is a short-type stub arranged to connect the first conductor to a ground through a via contact.
7. The spiral inductor according to claim 1 , wherein the switch comprises a Metal Oxide Semiconductor transistor.
8. An integrated circuit comprising the spiral inductor according to claim 6 .
9. A wireless terminal comprising the spiral inductor according to claim 6 .
10. The spiral inductor according to claim 6 , further comprising:
a via contact connected to the first conductor; and
a switching device arranged between the via contact and a ground,
wherein the via contact is connected to ground if the switching device is in an on-position.