Method and system for RC-CR quadrature generation with wideband coverage and process compensation

• US 8,073,080 B2
• Filed: 12/29/2006
• Issued: 12/06/2011
• Est. Priority Date: 12/06/2006
• Status: Expired due to Fees

• Current Assignee: Avago Technologies International Sales Pte Limited (Broadcom, Inc.)
• Original Assignee: Broadcom Corporation (Broadcom, Inc.)
• Inventors: Li, Qiang, Roufoogaran, Razieh, Carter, Keith, Behzad, Arya
• Primary Examiner(s): TSE, YOUNG TOI
• Application Number:
  US11/618,720
• Publication Number:
  US 20080137785A1
• Time in Patent Office: 1,803 Days
• Field of Search: 375279-281, 375/308, 375324-326, 375/329, 375/332, 329/304, 329/305, 329336-339, 329/344, 329/345, 332103-105, 332/144, 332/146, 455/23, 455/42, 455/125, 455/205
• US Class Current: 375/332
• CPC Class Codes: H03D 3/009 Compensating quadrature phase or amplitude imbalances

Abstract

Certain aspects of a method and system for RC-CR quadrature generation with wideband coverage and process compensation may include determining an amplitude mismatch between an in-phase (I) component and a quadrature (Q) component of a signal generated in a radio frequency (RF) transmitter or receiver. A variation in resistance of a quadrature network associated with the I component and Q component may be determined. The determined amplitude mismatch and the determined variation in the resistance of the quadrature network may be compensated by adjusting a resistance of a portion of the quadrature network associated with the I component and a resistance of a portion of the quadrature network associated with the Q component.

Claims

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

determining an amplitude mismatch between an in-phase (I) component and a quadrature (Q) component of a signal generated in a radio frequency (RF) transceiver;

determining a variation in resistance of a quadrature network associated with said I component and said Q component; and

compensating one or both of;

said determined amplitude mismatch and/or said determined variation in said resistance of said quadrature network by adjusting a resistance of a portion of said quadrature network associated with said I component and a resistance of a portion of said quadrature network associated with said Q component.

2. The method according to claim 1, wherein said adjusting compensates for variation in resistance of said quadrature network associated with said I component and said Q component due to one or more of:

process variations, temperature variations, and/or voltage variations in said RF transceiver.

3. The method according to claim 1, further comprising generating said I component and said Q component of said generated signal utilizing said quadrature network.

4. The method according to claim 1, wherein said quadrature network comprises a plurality of resistors and capacitors.

5. The method according to claim 1, further comprising adjusting a value of one or more bits to adjust said resistance of said portion of said quadrature network associated with said I component and said resistance of said portion of said quadrature network associated with said Q component.

6. The method according to claim 5, wherein said determined variation in said resistance of said quadrature network is compensated based on said adjusted value of said one or more bits.

7. The method according to claim 1, further comprising determining a frequency range of operation of said RF transceiver.

8. The method according to claim 7, further comprising compensating for said determined amplitude mismatch by setting a particular center frequency based on said determined frequency range of operation of said RF transceiver.

9. The method according to claim 1, further comprising compensating one or both of:

said determined amplitude mismatch and/or said determined variation in said resistance of said quadrature network by adjusting a capacitance of said portion of said quadrature network associated with said I component and a capacitance of said portion of said quadrature network associated with said Q component.

10. The method according to claim 9, further comprising calibrating one or both of:

said capacitance of said portion of said quadrature network associated with said I component and said capacitance of said portion of said quadrature network associated with said Q component.

11. The method according to claim 1, further comprising calibrating one or both of:

said resistance of said portion of said quadrature network associated with said I component and said resistance of said portion of said quadrature network associated with said Q component.

12. A system for processing signals, the system comprising:

one or more circuits that enables determination of an amplitude mismatch between an in-phase (I) component and a quadrature (Q) component of a signal generated in a radio frequency (RF) transceiver;

said one or more circuits enables determination of a variation in resistance of a quadrature network associated with said I component and said Q component; and

said one or more circuits enables compensation of one or both of;

said determined amplitude mismatch and/or said determined variation in said resistance of said quadrature network by adjusting a resistance of a portion of said quadrature network associated with said I component and a resistance of a portion of said quadrature network associated with said Q component.

13. The system according to claim 12, wherein said adjusting compensates for variation in resistance of said quadrature network associated with said I component and said Q component due to one or more of:

process variations, temperature variations, and/or voltage variations in said RF transceiver.

14. The system according to claim 12, wherein said one or more circuits enables generation of said I component and said Q component of said generated signal utilizing said quadrature network.

15. The system according to claim 12, wherein said quadrature network comprises a plurality of resistors and capacitors.

16. The system according to claim 12, wherein said one or more circuits enables adjusting of a value of one or more bits to adjust said resistance of said portion of said quadrature network associated with said I component and said resistance of said portion of said quadrature network associated with said Q component.

17. The system according to claim 16, wherein said one or more circuits enables compensation for said determined variation in said resistance of said quadrature network based on said adjusted value of said one or more bits.

18. The system according to claim 12, wherein said one or more circuits enables determination of a frequency range of operation of said RF transceiver.

19. The system according to claim 18, wherein said one or more circuits enables compensation for said determined amplitude mismatch by setting a particular center frequency based on said determined frequency range of operation of said RF transceiver.

20. The system according to claim 12, wherein said one or more circuits enables compensation for one or both of:

said determined amplitude mismatch and/or said determined variation in said resistance of said quadrature network by adjusting a capacitance of said portion of said quadrature network associated with said I component and a capacitance of said portion of said quadrature network associated with said Q component.

21. The system according to claim 20, wherein said one or more circuits enables calibration of one or both of:

said capacitance of said portion of said quadrature network associated with said I component and said capacitance of said portion of said quadrature network associated with said Q component.

22. The system according to claim 12, wherein said one or more circuits enables calibration of one or both of:

said resistance of said portion of said quadrature network associated with said I component and said resistance of said portion of said quadrature network associated with said Q component.

23. A non-transitory machine-readable storage medium having stored thereon, a computer program having at least one code section for processing signals, the at least one code section being executable by a machine for causing the machine to perform steps comprising:

determining an amplitude mismatch between an in-phase (I) component and a quadrature (Q) component of a signal generated in a radio frequency (RF) transceiver;

determining a variation in resistance of a quadrature network associated with said I component and said Q component; and

compensating one or both of;

said determined amplitude mismatch and/or said determined variation in said resistance of said quadrature network by adjusting a resistance of a portion of said quadrature network associated with said I component and a resistance of a portion of said quadrature network associated with said Q component.

24. The non-transitory machine-readable storage medium according to claim 23, wherein said adjusting compensates for variation in resistance of said quadrature network associated with said I component and said Q component due to one or more of:

process variations, temperature variations, and/or voltage variations in said RF transceiver.

25. The non-transitory machine-readable storage medium according to claim 23, wherein said at least one code section comprises code for generating said I component and said Q component of said generated signal utilizing said quadrature network.

26. The non-transitory machine-readable storage medium according to claim 23, wherein said quadrature network comprises a plurality of resistors and capacitors.

27. The non-transitory machine-readable storage medium according to claim 23, wherein said at least one code section comprises code for adjusting a value of one or more bits to adjust said resistance of said portion of said quadrature network associated with said I component and said resistance of said portion of said quadrature network associated with said Q component.

28. The non-transitory machine-readable storage medium according to claim 27, wherein said at least one code section comprises code for compensating for said determined variation in said resistance of said quadrature network based on said adjusted value of said one or more bits.

29. The non-transitory machine-readable storage medium according to claim 23, wherein said at least one code section comprises code for determining a frequency range of operation of said RF transceiver.

30. The non-transitory machine-readable storage medium according to claim 29, wherein said at least one code section comprises code for compensating for said determined amplitude mismatch by setting a particular center frequency based on said determined frequency range of operation of said RF transceiver.

31. The non-transitory machine-readable storage medium according to claim 23, wherein said at least one code section comprises code for compensating one or both of:

said determined amplitude mismatch and/or said determined variation in said resistance of said quadrature network by adjusting a capacitance of said portion of said quadrature network associated with said I component and a capacitance of said portion of said quadrature network associated with said Q component.

32. The non-transitory machine-readable storage medium according to claim 31, wherein said at least one code section comprises code for calibrating one or both of:

said capacitance of said portion of said quadrature network associated with said I component and said capacitance of said portion of said quadrature network associated with said Q component.

33. The non-transitory machine-readable storage medium according to claim 23, wherein said at least one code section comprises code for calibrating one or both of:

said resistance of said portion of said quadrature network associated with said I component and said resistance of said portion of said quadrature network associated with said Q component.