System for reducing power consumption in a local oscillator

• US 20060217098A1
• Filed: 03/22/2005
• Published: 09/28/2006
• Est. Priority Date: 03/22/2005
• Status: Abandoned Application

• Current Assignee: Skyworks Solutions Incorporated
• Original Assignee: Skyworks Solutions Incorporated
• Inventors: Anderson, Jeffrey Karl, Hatcher, Geoffrey, Zachan, Jeffrey M.
• Application Number:
  US11/086,107
• Publication Number:
  US 20060217098A1
• Time in Patent Office: Days
• US Class Current: 455/255
• CPC Class Codes: H03B 5/04 Modifications of generator to compensate for variations in physical values, e.g. power supply, load, temperature
• CPC Class Codes: H04B 1/109 by improving strong signal performance of the receiver when strong unwanted signals are present at the receiver input
• CPC Class Codes: H04W 52/0245 according to signal strength
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

A system for reducing power consumption of a local oscillator (LO) chain is disclosed. Embodiments of the system for reducing power consumption of a local oscillator chain include adjusting a bias control signal to the local oscillator depending on a noise parameter of the local oscillator. In one embodiment, the measured receive signal level is analyzed to derive an appropriate local oscillator bias control signal, which minimizes power consumption in the local oscillator.

Claims

1. A local oscillator (LO) chain bias control system, comprising:

means for adjusting a bias control signal to a local oscillator (LO) depending on a noise parameter of the local oscillator.

2. The LO chain bias control system of claim 1, wherein the noise parameter is dependent upon a strength of a receive signal.

3. The LO chain bias control system of claim 2, further comprising:

means for increasing a level of the bias control system when the receive signal weakens.

4. The LO chain bias control system of claim 2, further comprising:

means for decreasing a level of the bias control system when the receive signal strengthens.

5. The LO chain bias control system of claim 2, wherein the means for adjusting a bias control signal to a local oscillator (LO) further comprises means for detecting a power level of the receive signal.

6. The LO chain bias control system of claim 5, wherein the means for adjusting a bias control signal to a local oscillator (LO) means is responsive to the detected power level of the receive signal.

7. The LO chain bias control system of claim 1, wherein the means for adjusting a bias control signal to a local oscillator (LO) further comprises means for determining the level of the LO bias control signal according to a baseband LO power control element.

8. The LO chain bias control system of claim 7, wherein the means for adjusting a bias control signal to a local oscillator (LO) means is responsive to the baseband LO power control element.

9. A method for controlling the bias power supplied to a local oscillator (LO) chain, comprising:

adjusting a bias control signal to a local oscillator (LO) depending on a noise parameter of the local oscillator.

10. The method of claim 9, wherein the noise parameter is dependent upon a strength of a receive signal.

11. The method of claim 10, further comprising increasing a level of the bias control system when the receive signal weakens.

12. The method of claim 10, further comprising decreasing a level of the bias control system when the receive signal strengthens.

13. The method of claim 10, further comprising detecting a power level of the receive signal.

14. The method of claim 13, wherein the adjusting a bias control signal to a local oscillator (LO) is responsive to a detected power level of the receive signal.

15. The method of claim 9, further comprising determining the level of the LO bias control signal using a baseband LO power control element.

16. The method of claim 15, further comprising adjusting a bias control signal to a local oscillator (LO) according to the baseband LO power control element.

17. A system for controlling the bias power supplied to a local oscillator (LO) chain located in a portable communication device, comprising:

a portable communication device including a transmitter and a receiver;

a receive signal strength determination element located in the receiver; and

an LO power control element responsive to the receive signal strength determination element, the LO power control element configured to supply a bias control signal to a local oscillator, the bias control signal level determined by the relative signal strength of the receive signal.

18. The system of claim 17, wherein the bias control signal level is increased when the receive signal weakens.

19. The system of claim 17, wherein the bias control signal level is decreased when the receive signal strengthens.

20. The system of claim 19, wherein the bias control signal level is decreased when the relative signal strength of the receive signal reaches a predetermined level.

21. The system of claim 20, wherein the bias control signal level is decreased when the relative signal strength of the receive signal reaches −

70 dBm.

22. A local oscillator (LO) controller, comprising an LO power control element responsive to a receive signal strength determination element, the LO power control element configured to supply a bias control signal to a local oscillator, the bias control signal level determined by the relative strength of the receive signal.