Method and system for transmission and/or reception of signals utilizing a delay circuit and DDFS

• US 8,059,706 B2
• Filed: 09/24/2007
• Issued: 11/15/2011
• Est. Priority Date: 09/24/2007
• Status: Expired due to Fees

• Current Assignee: Avago Technologies International Sales Pte Limited (Broadcom, Inc.)
• Original Assignee: Broadcom Corporation (Broadcom, Inc.)
• Inventors: Rofougaran, Ahmadreza
• Primary Examiner(s): Fan; Chieh M
• Assistant Examiner(s): Garcia; Santiago
• Application Number:
  US11/860,128
• Publication Number:
  US 20090080541A1
• Time in Patent Office: 1,513 Days
• Field of Search: 375/230
• US Class Current: 375/230
• CPC Class Codes: H04B 1/403 using the same oscillator for generating both the transmitter frequency and the receiver local oscillator frequency

Abstract

Aspects of a method and system for transmission and/or reception of signals utilizing a delay circuit and a DDFS are provided. In this regard, a first signal may be delayed by 90°, via a plurality of delay elements and variable capacitance, to generate a second signal. The first and second signal may be mixed to generate a first LO signal, which may be utilized for a first frequency conversion. A second LO signal may be generated via a DDFS and may be utilized for a second frequency conversion. A digital input word of the DDFS, a value of the variable capacitance, and/or at least a portion of the delay elements, may be programmatically controlled based on a desired frequency for transmission and/or desired frequency for reception. The first frequency conversions may be up-conversions and/or down-conversions to/from baseband, one or more intermediate frequencies, and/or RF.

Claims

1. A method for wireless communication, the method comprising:

delaying a first signal to generate a second signal which is 90°

phase shifted relative to the first signal, wherein said delaying is performed utilizing a selected portion of a plurality of delay elements and a variable capacitance;

mixing said first signal and said second signal to generate a first local oscillator signal that is twice a frequency of said first signal, wherein said first local oscillator signal is utilized for a first frequency conversion and said selected portion of said plurality of delay elements is selected based on a signal strength of said first local oscillator signal;

generating, based on said first signal used for said first frequency conversion, a second local oscillator signal utilizing a direct digital frequency synthesizer, wherein said second local oscillator signal is utilized for a second frequency conversion;

up-converting a baseband signal to an intermediate frequency signal utilizing said first local oscillator signal; and

up-converting said intermediate frequency to a radio frequency suitable for transmission utilizing said second local oscillator signal.

2. The method according to claim 1, comprising up-converting a first intermediate frequency to a second intermediate frequency utilizing said first local oscillator signal.

3. The method according to claim 1, comprising down-converting a received signal to an intermediate frequency utilizing said second local oscillator signal.

4. The method according to claim 3, comprising down-converting said intermediate frequency to baseband utilizing said first local oscillator signal.

5. The method according to claim 1, comprising down-converting a first intermediate frequency to a second intermediate frequency utilizing said first local oscillator signal.

6. The method according to claim 1, comprising programmably controlling a digital input word of said direct digital frequency synthesizer based on a desired frequency for transmission and/or desired frequency for reception.

7. The method according to claim 1, comprising programmably controlling said at least a portion of said plurality of delay elements based on a desired frequency for transmission and/or desired frequency for reception.

8. The method according to claim 1, comprising programmably controlling said variable capacitance based on a desired frequency for transmission and/or desired frequency for reception.

9. A system for wireless communication, the system comprising:

one or more circuits comprising a plurality of delay elements and a variable capacitance, said one or more circuits enable delay of a first signal to generate a second signal which is 90°

phase shifted relative to the first signal, wherein said delaying is performed utilizing a selected portion of said plurality of delay elements and said variable capacitance;

said one or more circuits enable mixing of said first signal and said second signal to generate a first local oscillator signal that is twice a frequency of said first signal, wherein said first local oscillator signal is utilized for a first frequency conversion and said selected portion of said plurality of delay elements is selected based on a signal strength of said first local oscillator signal;

said one or more circuits comprise a direct digital frequency synthesizer, and said one or more circuits enable generation, based on said first signal used for said first frequency conversion, of a second local oscillator signal utilizing said direct digital frequency synthesizer, wherein said second local oscillator signal is utilized for a second frequency conversion;

said one or more circuits enable up-conversion of a baseband signal to an intermediate frequency utilizing said first local oscillator signal; and

said one or more circuits enable up-conversion of said intermediate frequency to a radio frequency suitable for transmission utilizing said second local oscillator signal.

10. The system according to claim 9, wherein said one or more circuits enable up-conversion of a first intermediate frequency to a second intermediate frequency utilizing said first local oscillator signal.

11. The system according to claim 9, wherein said one or more circuits enable down-conversion of a received signal to an intermediate frequency utilizing said second local oscillator signal.

12. The system according to claim 11, wherein said one or more circuits enable down-converting said intermediate frequency to baseband utilizing said first local oscillator signal.

13. The system according to claim 9, wherein said one or more circuits enable down-conversion of a first intermediate frequency to a second intermediate frequency utilizing said first local oscillator signal.

14. The system according to claim 9, wherein said one or more circuits enable programmatic control of a digital input word of said direct digital frequency synthesizer based on a desired frequency for transmission and/or desired frequency for reception.

15. The system according to claim 9, wherein said one or more circuits enable programmatic control of said at least a portion of said plurality of delay elements based on a desired frequency for transmission and/or desired frequency for reception.

16. The system according to claim 9, wherein said one or more circuits enable programmatic control of said variable capacitance based on a desired frequency for transmission and/or desired frequency for reception.

17. A method for wireless communication, the method comprising:

delaying a first signal to generate a second signal which is 90°

phase shifted relative to the first signal, wherein said delaying is performed utilizing a selected portion of a plurality of delay elements and a variable capacitance;

mixing said first signal and said second signal to generate a first local oscillator signal that is twice a frequency of said first signal, wherein said first local oscillator signal is utilized for a first frequency conversion and said selected portion of said plurality of delay elements is selected based on a signal strength of said first local oscillator signal;

generating, based on said first signal used for said first frequency conversion, a second local oscillator signal utilizing a direct digital frequency synthesizer, wherein said second local oscillator signal is utilized for a second frequency conversion;

down-converting a received signal to an intermediate frequency utilizing said second local oscillator signal; and

down-converting said intermediate frequency to baseband utilizing said first local oscillator signal.

18. The method according to claim 17, comprising up-converting a baseband signal to an intermediate frequency signal utilizing said first local oscillator signal.

19. The method according to claim 18, comprising up-converting said intermediate frequency to a radio frequency suitable for transmission utilizing said second local oscillator signal.

20. The method according to claim 17, comprising up-converting a first intermediate frequency to a second intermediate frequency utilizing said first local oscillator signal.

21. The method according to claim 17, comprising down-converting a first intermediate frequency to a second intermediate frequency utilizing said first local oscillator signal.

22. The method according to claim 17, comprising programmably controlling a digital input word of said direct digital frequency synthesizer based on a desired frequency for transmission and/or desired frequency for reception.

23. The method according to claim 17, comprising programmably controlling said at least a portion of said plurality of delay elements based on a desired frequency for transmission and/or desired frequency for reception.

24. The method according to claim 17, comprising programmably controlling said variable capacitance based on a desired frequency for transmission and/or desired frequency for reception.

25. A system for wireless communication, the system comprising:

one or more circuits comprising a plurality of delay elements and a variable capacitance, said one or more circuits enable delay of a first signal to generate a second signal which is 90°

phase shifted relative to the first signal, wherein said delaying is performed utilizing a selected portion of said plurality of delay elements and said variable capacitance;

said one or more circuits enable mixing of said first signal and said second signal to generate a first local oscillator signal that is twice a frequency of said first signal, wherein said first local oscillator signal is utilized for a first frequency conversion and said selected portion of said plurality of delay elements is selected based on a signal strength of said first local oscillator signal;

said one or more circuits comprise a direct digital frequency synthesizer, and said one or more circuits enable generation, based on said first signal used for said first frequency conversion, of a second local oscillator signal utilizing said direct digital frequency synthesizer, wherein said second local oscillator signal is utilized for a second frequency conversion;

said one or more circuits enable down-conversion of a received signal to an intermediate frequency utilizing said second local oscillator signal; and

said one or more circuits enable down-converting said intermediate frequency to baseband utilizing said first local oscillator signal.

26. The system according to claim 25, wherein said one or more circuits enable up-conversion of a baseband signal to an intermediate frequency utilizing said first local oscillator signal.

27. The system according to claim 26, wherein said one or more circuits enable up-conversion of said intermediate frequency to a radio frequency suitable for transmission utilizing said second local oscillator signal.

28. The system according to claim 25, wherein said one or more circuits enable up-conversion of a first intermediate frequency to a second intermediate frequency utilizing said first local oscillator signal.

29. The system according to claim 25, wherein said one or more circuits enable down-conversion of a first intermediate frequency to a second intermediate frequency utilizing said first local oscillator signal.

30. The system according to claim 25, wherein said one or more circuits enable programmatic control of a digital input word of said direct digital frequency synthesizer based on a desired frequency for transmission and/or desired frequency for reception.

31. The system according to claim 25, wherein said one or more circuits enable programmatic control of said at least a portion of said plurality of delay elements based on a desired frequency for transmission and/or desired frequency for reception.

32. The system according to claim 25, wherein said one or more circuits enable programmatic control of said variable capacitance based on a desired frequency for transmission and/or desired frequency for reception.