ADJUSTABLE INDUCTOR AND WIDEBAND VOLTAGE CONTROLLED OSCILLATOR

• US 20090174493A1
• Filed: 04/18/2008
• Published: 07/09/2009
• Est. Priority Date: 01/09/2008
• Status: Abandoned Application

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Lee, Heung-bae, Choi, Kyu-don, Bang, Hee-mun, Cha, Choong-yul, Jeon, Sang-yoon, Jung, Sung-jae
• Application Number:
  US12/105,599
• Publication Number:
  US 20090174493A1
• Time in Patent Office: Days
• US Class Current: 331/181
• CPC Class Codes: H01F 17/0006 Printed inductances printed coils for dynamo-electric machines H02K3/26; printed circuits H05K
• CPC Class Codes: H01F 21/12 discontinuously variable, e.g. tapped
• CPC Class Codes: H03B 2201/0208 the means being an element with a variable capacitance, e.g. capacitance diode
• CPC Class Codes: H03B 2201/0216 the means being an element with a variable inductance
• CPC Class Codes: H03B 5/1215 the current source or degeneration circuit being in common to both transistors of the pair, e.g. a cross-coupled long-tailed pair
• CPC Class Codes: H03B 5/1228 the amplifier comprising one or more field effect transistors
• CPC Class Codes: H03B 5/124 the means comprising a voltage dependent capacitance
• CPC Class Codes: H03B 5/1243 the means comprising voltage variable capacitance diodes
• CPC Class Codes: H03B 5/1256 the means comprising a variable inductance
• CPC Class Codes: H03B 5/1296 the feedback circuit comprising a transformer

Abstract

An adjustable inductor includes a first conductor line to receive an alternating current (AC) signal, a second conductor line configured in a loop arrangement, to generate an inducting current upon receiving the AC signal at the first conductor line, and a switch to adjust an inductance of the first conductor line by switching a loop connection of the second conductor line according to an external control signal.

Claims

1. An adjustable inductor comprising:

a first conductor line to receive an alternating current (AC) signal;

a second conductor line configured in a loop arrangement, to generate an inducting current upon receiving the AC signal at the first conductor line; and

a switch to adjust an inductance of the first conductor line by switching a loop connection of the second conductor line according to an external control signal.

2. The adjustable inductor of claim 1, wherein the first conductor line is arranged within the second conductor line and configured in a loop arrangement.

3. The adjustable inductor of claim 2, wherein the first conductor line is configured in a symmetrical arrangement, both vertically and horizontally, with reference to an imaginary line crossing a center.

4. The adjustable inductor of claim 1, wherein the first conductor line is arranged co-planar with the second conductor line, and configured in a multi-spiral structure.

5. The adjustable inductor of claim 1, wherein the second conductor line is configured in a symmetrical arrangement, both vertically and horizontally, with reference to an imaginary line crossing a center.

6. The adjustable inductor of claim 5, further comprising a substrate to support the first and second conductor lines, wherein the first and second conductor lines are arranged co-planar with each other.

7. The adjustable inductor of claim 1, wherein the switch switches so that the second conductor line becomes a closed loop when the switch is turned on in response to the external control signal, and becomes an open loop when the switch is turned off in response to the external control signal.

8. A wideband voltage controlled oscillator comprising:

an adjustable capacitor;

an adjustable inductor to provide an inductance in response to an alternating current (AC) signal, and to vary the inductance by selectively using an inducing current generated in response to the AC signal; and

an adjuster to vary an oscillation frequency by varying a capacitance of the adjustable capacitor and an inductance of the adjustable inductor.

9. The wideband voltage controlled oscillator of claim 8, wherein the adjustable inductor comprises:

a first conductor line to receive the AC signal;

a second conductor line configured in a loop arrangement, to generate an inducing current in response to the AC signal received at the first conductor line; and

a switch to adjust an inductance of the first conductor line, by switching a loop connection of the second conductor line in accordance with a control signal applied from the adjuster.

10. The wideband voltage controlled oscillator of claim 9, wherein the first conductor line is arranged within the second conductor line, and configured in a loop arrangement.

11. The wideband voltage controlled oscillator of claim 10, wherein the first conductor line is configured in a symmetrical arrangement, both vertically and horizontally, with reference to an imaginary line crossing a center.

12. The wideband voltage controlled oscillator of claim 9, wherein the first conductor line is arranged co-planar with the second conductor line, and configured in a multi-spiral structure.

13. The wideband voltage controlled oscillator of claim 9, wherein the second conductor line is configured in a symmetrical arrangement, both vertically and horizontally, with reference to an imaginary line crossing a center.

14. The wideband voltage controlled oscillator of claim 13, wherein the adjustable inductor further comprises a substrate to support the first and second conductor lines, and the first and second conductor lines are arranged co-planar with each other.

15. The wideband voltage controlled oscillator of claim 9, wherein the switch switches so that the second conductor line becomes a closed loop when the switch is turned on in response to the external control signal, and becomes an open loop when the switch is turned off in response to the external control signal.