Method and system for mitigating the effects of pulling in multiple phase locked loops in multi-standard systems

• US 8,676,139 B2
• Filed: 01/11/2011
• Issued: 03/18/2014
• Est. Priority Date: 12/06/2006
• Status: Active Grant

• Current Assignee: Avago Technologies International Sales Pte Limited (Broadcom, Inc.)
• Original Assignee: Broadcom Corporation (Broadcom, Inc.)
• Inventors: Li, Qiang, Roufoogaran, Razieh, Behzad, Arya, Li, Dandan, Chien, Hung-Ming
• Primary Examiner(s): PHU, SANH D
• Application Number:
  US13/004,675
• Publication Number:
  US 20110103526A1
• Time in Patent Office: 1,162 Days
• Field of Search: 455/230, 455/552.1, 455/285, 455/553.1, 455/207, 455/209, 455/313, 375/340
• US Class Current: 455/230
• CPC Class Codes: H03L 7/18 using a frequency divider or counter in the loop H03L7/20, H03L7/22 take precedence
• CPC Class Codes: H04B 1/406 with more than one transmission mode, e.g. analog and digital modes
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

Certain aspects of a method and system for mitigating effects of pulling in multiple phase locked loops in multi-standard systems may include selecting an input frequency range of operation at a voltage controlled oscillator based on a particular wireless band of operation in a system that handles a first wireless communication protocol and a second wireless communication protocol. An image rejection mixer may be enabled to generate an output signal for the particular wireless band of operation based on mixing a plurality of received signals within a selected frequency range. An in-phase (I) component and a quadrature (Q) component of the generated output signal may be generated by utilizing a RC-CR quadrature network.

Claims

1. A method for processing signals, the method comprising:

in a system that handles a plurality of wireless communication protocols,

selecting an input frequency range of operation at a voltage controlled oscillator from a plurality of available frequency ranges based on a particular wireless band of operation, wherein a signal output of the voltage controlled oscillator is input to a first local oscillator component associated with a first wireless band of operation and a second local oscillator component associated with a second wireless band of operation;

selecting an output frequency range of operation to be generated; and

generating an in-phase (I) component and a quadrature (Q) component of an output signal based on mixing a plurality of received signals within the selected input frequency range of operation and the selected output frequency range of operation, wherein the plurality of received signals that is mixed comprises the signal output of the voltage controlled oscillator and the in-phase component or the quadrature component of the output signal.

2. The method according to claim 1, comprising generating the output signal for 802.11a wireless band of operation by mixing a buffered signal output of the voltage controlled oscillator with one of:

a first generated I component signal or a second generated I component signal.

3. The method according to claim 2, comprising generating the output signal for one of:

802.11b wireless band of operation or 802.11g wireless band of operation by mixing the first generated I component signal with at least one of a third generated I component signal or a fourth generated I component signal.

4. The method according to claim 3, comprising selecting the selected input frequency range of operation based on one of:

a Bluetooth mode of operation, the 802.11a wireless band of operation, the 802.11b wireless band of operation or the 802.11g wireless band of operation.

5. The method according to claim 1, comprising dividing a frequency of the plurality of received signals based on the particular wireless band of operation.

6. The method according to claim 1, comprising mixing, by an image rejection mixer, the plurality of received signals within the selected input frequency range of operation.

19. The method according to claim 1, further comprising selecting divider configurations for the first local oscillator component and the second oscillator components based on the selected input frequency range of operation and the selected output frequency range of operation.

7. A machine-readable storage having stored thereon, a computer program having at least one code section that processes signals, the at least one code section being executable by a machine that causes the machine to:

in a system that handles a plurality of wireless communication protocols, select an input frequency range of operation at a voltage controlled oscillator from a plurality of available frequency ranges based on a particular wireless band of operation, wherein a signal output of the voltage controlled oscillator is input to a first local oscillator component associated with a first wireless band of operation and a second local oscillator component associated with a second wireless band of operation;

select an output frequency range of operation to be generated; and

generate an in-phase (I) component and a quadrature (Q) component of an output signal based on mixing a plurality of received signals within the selected input frequency range of operation and the selected output frequency range of operation, wherein the plurality of received signals that is mixed comprises the signal output of the voltage controlled oscillator and the in-phase component or the quadrature component of the output signal.

8. The machine-readable storage according to claim 7, the at least one code section comprises code that generates the output signal for 802.11a wireless band of operation by mixing a buffered signal output of the voltage controlled oscillator with one of:

a first generated I component signal or a second generated I component signal.

9. The machine-readable storage according to claim 8, the at least one code section comprises code that generates the output signal for one of:

802.11b wireless band of operation or 802.11g wireless band of operation by mixing the first generated I component signal with at least one of a third generated I component signal or a fourth generated I component signal.

10. The machine-readable storage according to claim 9, the at least one code section comprises code that selects the selected input frequency range of operation based on one of:

a Bluetooth mode of operation, the 802.11a wireless band of operation, the 802.11b wireless band of operation or the 802.11g wireless band of operation.

11. The machine-readable storage according to claim 7, the at least one code section comprises code that divides a frequency of the plurality of received signals based on a particular wireless band of operation.

12. The machine-readable storage according to claim 7, wherein the at least one code section comprises code that mixes, by an image rejection mixer, the plurality of received signals within the selected input frequency range of operation.

13. A system, the system comprising:

one or more circuits in a communication system that handles a plurality of wireless communication protocols, the one or more circuits being operable to select an input frequency range of operation at a voltage controlled oscillator from a plurality of available frequency ranges based on a particular wireless band of operation, wherein a signal output of the voltage controlled oscillator is input to a first local oscillator component associated with a first wireless band of operation and a second local oscillator component associated with a second wireless band of operation;

the one or more circuits further operable to select an output frequency range of operation to be generated; and

the one or more circuits further operable to generate an in-phase (I) component and a quadrature (Q) component of an output signal based on mixing a plurality of received signals within the selected input frequency range of operation and the selected output frequency range of operation, wherein the plurality of received signals that is mixed comprises the signal output of the voltage controlled oscillator and the in-phase component or the quadrature component of the output signal.

14. The system according to claim 13, wherein the one or more circuits are operable to generate the output signal for 802.11a wireless band of operation by mixing a buffered signal output of the voltage controlled oscillator with one of:

a first generated I component signal or a second generated I component signal.

15. The system according to claim 14, wherein the one or more circuits are operable to generate the output signal for one of:

802.11b wireless band of operation or 802.11g wireless band of operation by mixing the first generated I component signal with at least one of a third generated I component signal or a fourth generated I component signal.

16. The system according to claim 15, wherein the one or more circuits are operable to select the selected input frequency range of operation based on one of:

a Bluetooth mode of operation, the 802.11a wireless band of operation, the 802.11b wireless band of operation or the 802.11g wireless band of operation.

17. The system according to claim 13, wherein the one or more circuits are operable to divide a frequency of the plurality of received signals based on a particular wireless band of operation.

18. The system according to claim 13, wherein the one or more circuits comprise an image rejection mixer, wherein the one or more circuits are operable to mix the plurality of received signals within the selected input frequency range of operation.

20. The system according to claim 13, wherein the one or more circuits are operable to select divider configurations for the first local oscillator component and the second oscillator components based on the selected input frequency range of operation and the selected output frequency range of operation.