Adjustable differential inductor

• US 20060066431A1
• Filed: 10/05/2004
• Published: 03/30/2006
• Est. Priority Date: 09/14/2004
• Status: Abandoned Application

• Current Assignee: Avago Technologies General IP PTE Limited (Broadcom, Inc.)
• Original Assignee: Avago Technologies General IP PTE Limited (Broadcom, Inc.)
• Inventors: Zhang, Lijun, Anand, Seema B.
• Application Number:
  US10/958,607
• Publication Number:
  US 20060066431A1
• Time in Patent Office: Days
• US Class Current: 336/137
• CPC Class Codes: H01F 21/12 discontinuously variable, e.g. tapped
• CPC Class Codes: H03F 2200/372 Noise reduction and elimination in amplifier
• CPC Class Codes: H03F 3/45179 using MOSFET transistors as the active amplifying circuit H03F3/45278 takes precedence
• CPC Class Codes: H03J 2200/15 Tuning of resonator by means of digitally controlled inductor bank

Abstract

An adjustable differential inductor includes a first winding section, a second winding section, a third winding section, a fourth winding section, and a switching network operably coupled to configure the first, second, third, and fourth windings for a first differential inductance in a first mode and to configure two of the first, second, third, and fourth windings for a second differential inductance in a second mode.

Claims

1. An adjustable differential inductor comprises:

a first winding section;

a second winding section;

a third winding section;

a fourth winding section; and

a switching network operably coupled to configure the first, second, third, and fourth windings for a first differential inductance in a first mode and to configure two of the first, second, third, and fourth windings for a second differential inductance in a second mode.

2. The adjustable differential inductor of claim 1, wherein the switching network comprises:

a first switch having a first node and a second node, wherein the first node of the first switch is coupled to a common node of the first and second winding sections and the second node of the first switch is coupled a ground reference; and

a second switch having a first node and a second node, wherein the first node of the second switch is coupled to the ground reference and the second node of the second switch is coupled to a common node of the third and fourth winding sections, wherein a common node of the second and third winding sections is coupled to the ground reference.

3. The adjustable differential inductor of claim 1, wherein the switching network comprises:

a first switch having a first node and a second node, wherein the first node of the first switch is coupled to a common node of the first and second winding sections and the second node of the first switch is coupled a ground reference;

a second switch having a first node and a second node, wherein the first node of the second switch is coupled to a common node of the second and third winding sections and the second node of the second switch is coupled to the ground reference; and

a third switch having a first node and a second node, wherein the first node of the third switch is coupled to a common node of the third and fourth winding sections and the second node of the third switch is coupled to the ground reference.

4. The adjustable differential inductor of claim 1, wherein the switching network comprises:

a first switch coupled in series with a first node of the first winding section, wherein a second node of the first winding section is coupled to a first node of the second winding section;

a second switch coupled in series with the first node of the second winding section, wherein a second node of the second winding section is coupled to a first node of the third winding section;

a third switch coupled in series with a second node of the third winding section, wherein the second node of the third winding section is coupled to a first node of the fourth winding section; and

a fourth switch coupled in series with a second node of the fourth winding section, wherein the second node of the third winding section is coupled to a first node of the fourth winding section, wherein the second node of the second winding section is coupled to a ground reference.

5. The adjustable differential inductor of claim 1 comprises:

the first mode corresponding to a carrier frequency of 2.4 GHz; and

the second mode corresponding to a carrier frequency of 5 GHz.

6. A radio frequency integrated circuit (RFIC) comprises:

a low noise amplifier operably coupled to amplify inbound radio frequency (RF) signals to produce amplified RF signals;

a down conversion module operably coupled to convert the amplified inbound RF signals into low intermediate frequency (IF) inbound signals based on a receiver local oscillation;

analog to digital conversion module operably coupled to convert the low IF inbound signals into inbound low IF digital signals;

processing module operably coupled to convert the inbound low IF digital signals into inbound data and to convert outbound data into outbound low IF digital signals;

digital to analog conversion module operably coupled to convert the outbound low IF digital signals into outbound low IF signals;

up conversion module operably coupled to convert the outbound low IF signals into outbound RF signals based on a transmitter local oscillation;

power amplifier operably coupled to amplify the outbound RF signals; and

a local oscillation module operably coupled to produce the receiver local oscillation and the transmitter local oscillation, wherein at least one of the low noise amplifier, the down conversion module, the up conversion module, and the power amplifier include an adjustable differential inductor that includes;

a first winding section;

a second winding section;

a third winding section;

a fourth winding section; and

a switching network operably coupled to configure the first, second, third, and fourth windings for a first differential inductance in a first mode and to configure two of the first, second, third, and fourth windings for a second differential inductance in a second mode.

7. The RFIC of claim 6, wherein the switching network comprises:

a first switch having a first node and a second node, wherein the first node of the first switch is coupled to a common node of the first and second winding sections and the second node of the first switch is coupled a ground reference; and

a second switch having a first node and a second node, wherein the first node of the second switch is coupled to the ground reference and the second node of the second switch is coupled to a common node of the third and fourth winding sections, wherein a common node of the second and third winding sections is coupled to the ground reference.

8. The RFIC of claim 6, wherein the switching network comprises:

a first switch having a first node and a second node, wherein the first node of the first switch is coupled to a common node of the first and second winding sections and the second node of the first switch is coupled a ground reference;

a second switch having a first node and a second node, wherein the first node of the second switch is coupled to a common node of the second and third winding sections and the second node of the second switch is coupled to the ground reference; and

a third switch having a first node and a second node, wherein the first node of the third switch is coupled to a common node of the third and fourth winding sections and the second node of the third switch is coupled to the ground reference.

9. The RFIC of claim 6, wherein the switching network comprises:

a first switch coupled in series with a first node of the first winding section, wherein a second node of the first winding section is coupled to a first node of the second winding section;

a second switch coupled in series with the first node of the second winding section, wherein a second node of the second winding section is coupled to a first node of the third winding section;

a third switch coupled in series with a second node of the third winding section, wherein the second node of the third winding section is coupled to a first node of the fourth winding section; and

a fourth switch coupled in series with a second node of the fourth winding section, wherein the second node of the third winding section is coupled to a first node of the fourth winding section, wherein the second node of the second winding section is coupled to a ground reference.

10. The RFIC of claim 6, wherein the adjustable differential inductor comprises:

the first mode corresponding to a carrier frequency of 2.4 GHz; and

the second mode corresponding to a carrier frequency of 5 GHz.