Local oscillation routing plan applicable to a multiple RF band RF MIMO transceiver

• US 7,356,325 B2
• Filed: 07/01/2005
• Issued: 04/08/2008
• Est. Priority Date: 04/04/2005
• Status: Expired due to Fees

• Current Assignee: Avago Technologies International Sales Pte Limited (Broadcom, Inc.)
• Original Assignee: Broadcom Corporation (Broadcom, Inc.)
• Inventors: Behzad, Arya Reza, Darabi, Hooman
• Primary Examiner(s): Vuong; Quochien B.
• Application Number:
  US11/173,043
• Publication Number:
  US 20060223482A1
• Time in Patent Office: 1,012 Days
• Field of Search: 455/41.1, 455/41.2, 455/73, 455/313, 455/323, 455/333, 455/334, 455/552.1, 455/560, 455/561, 455/562.1, 370/901, 370/908
• US Class Current: 455/323
• CPC Class Codes: H04B 1/0082 with a common local oscillator for more than one band

Abstract

Local oscillation circuitry for use in an RF transceiver Integrated Circuit (IC) includes local oscillation generation circuitry operable to produce a local oscillation and local oscillation distribution circuitry. The local oscillation distribution circuitry includes a splitting circuit, a first distribution portion, and a second distribution portion. The splitting circuit receives the local oscillation and produces multiple copies of the local oscillation. The first distribution portion produces a first local oscillation corresponding to a first RF band and a second local oscillation corresponding to a second RF band based and to provide the first local oscillation and the second local oscillation to a first RF transceiver group. The second distribution portion produces a first local oscillation and a second local oscillation and provides the first local oscillation and the second local oscillation to the second RF transceiver group.

Claims

1. A Radio Frequency (RF) transceiver Integrated Circuit (IC) comprising:

a first RF transceiver group that is operable to service both a first RF band and a second RF band; and

a second RF transceiver group that is operable to service both a first RF band and a second RF band;

local oscillation generation circuitry operable to produce a local oscillation; and

local oscillation distribution circuitry operably coupled to the local oscillation generation circuitry, to the first RF transceiver group, and to the second RF transceiver group, the local oscillation distribution circuitry comprising;

a splitting circuit operable to receive the local oscillation from the local oscillation generation circuitry and to produce multiple copies of the local oscillation;

a first distribution portion coupled to the splitting circuit and operable to produce a first local oscillation corresponding to the first RF band based upon the local oscillation, to produce a second local oscillation corresponding to the second RF band based upon the local oscillation, and to provide the first local oscillation and the second local oscillation to the first RF transceiver group; and

a second distribution portion coupled to the splitting circuit and operable to produce a first local oscillation corresponding to the first RF band based upon the local oscillation, to produce a second local oscillation corresponding to the second RF band based upon the local oscillation, and to provide the first local oscillation and the second local oscillation to the second RF transceiver group.

2. The RF transceiver of claim 1, wherein the local oscillation generation circuitry resides substantially along a center line of symmetry of the RF transceiver IC.

3. The RF transceiver of claim 1, wherein the splitting circuit of the local oscillation distribution circuitry resides substantially along a center line of symmetry of the RF transceiver IC.

4. The RF transceiver IC of claim 1, wherein the first distribution portion and the second distribution portion of the local oscillation distribution circuitry reside in substantial symmetry about a center line of symmetry of the RF transceiver IC.

5. The RF transceiver IC of claim 1, wherein each of the first distribution portion and the second distribution portion comprise a plurality of drivers and at least one divider.

6. The RF transceiver IC of claim 1, further comprising:

a first baseband section having a first Rx baseband section and a first Tx baseband section;

a second baseband section having a second Rx baseband section and a second Tx baseband section; and

wherein the first baseband section and the second baseband section reside in substantial symmetry about a center line of symmetry of the RF transceiver IC.

7. The RF transceiver IC of claim 1, wherein:

the first transceiver group comprises a first RF band transmitter, a first RF band receiver, a second RF band transmitter, and a second RF band receiver; and

the second transceiver group comprises a first RF band transmitter, a first RF band receiver, a second RF band transmitter, and a second RF band receiver.

8. The RF transceiver IC of claim 7, wherein:

the first RF band transmitter of the first transceiver group resides in substantial symmetry with the first RF band transmitter of the second transceiver group about a center line of symmetry of the RF transceiver IC;

the second RF band transmitter of the first transceiver group resides in substantial symmetry with the second RF band transmitter of the second transceiver group about the center line of symmetry of the RF transceiver IC;

the first RF band receiver of the first transceiver group resides in substantial symmetry with the first RF band receiver of the second transceiver group about the center line of symmetry of the RF transceiver IC; and

the second RF band receiver of the first transceiver group resides in substantial symmetry with the second RF band receiver of the second transceiver group about the center line of symmetry of the RF transceiver IC.

9. The RF transceiver IC of claim 8, wherein:

a sequential order of position of the first transceiver group components from the center line of symmetry of the RF transceiver IC is the second RF band transmitter, the first RF band transmitter, the second RF band receiver, and the first RF band receiver; and

a sequential order of position of the second transceiver group components from the center line of symmetry of the RF transceiver integrated circuit is the second RF band transmitter, the first RF band transmitter, the second RF band receiver, and the first RF band receiver.

10. The RF transceiver IC of claim 8, wherein:

a sequential order of position of the first transceiver group components from the center line of symmetry of the RF transceiver IC is the second RF band transmitter, the second RF band receiver, the first RF band transmitter, and the first RF band receiver; and

a sequential order of position from the center line of symmetry of the RF transceiver integrated circuit of the second transceiver group components is the second RF band transmitter, the second RF band receiver, the first RF band transmitter, and the first RF band receiver.

11. The RF transceiver IC of claim 1, wherein:

the first distribution portion of the local oscillation distribution circuitry resides between a first baseband section and the first RF transceiver group; and

the second distribution portion of the local oscillation distribution circuitry further resides between a second baseband section and the second RF transceiver group.

12. The RF transceiver IC of claim 1, wherein:

when the first RF transceiver group and/or the second RF transceiver group is servicing communications in the second RF band, the local oscillation corresponds to the second local oscillation; and

when the first RF transceiver group and/or the second RF transceiver group is servicing communications in the first RF band, the local oscillation corresponds to an integer multiple of the first local oscillation.

13. Local oscillation circuitry formed in a Radio Frequency (RF) transceiver Integrated Circuit (IC) that includes a first RF transceiver group that is operable to service both a first RF band and a second RF band and a second RF transceiver group that is operable to service both a first RF band and a second RF band, the local oscillation circuitry comprising:

local oscillation generation circuitry operable to produce a local oscillation; and

local oscillation distribution circuitry operably coupled to the local oscillation generation circuitry, to the first RF transceiver group, and to the second RF transceiver group, the local oscillation distribution circuitry comprising;

a splitting circuit operable to receive the local oscillation from the local oscillation generation circuitry and to produce multiple copies of the local oscillation;

a first distribution portion coupled to the splitting circuit and operable to produce a first local oscillation corresponding to the first RF band based upon the local oscillation, to produce a second local oscillation corresponding to the second RF band based upon the local oscillation, and to provide the first local oscillation and the second local oscillation to the first RF transceiver group; and

a second distribution portion coupled to the splitting circuit and operable to produce a first local oscillation corresponding to the first RF band based upon the local oscillation, to produce a second local oscillation corresponding to the second RF band based upon the local oscillation, and to provide the first local oscillation and the second local oscillation to the second RF transceiver group.

14. The local oscillation circuitry of claim 13, wherein the local oscillation generation circuitry resides substantially along a center line of symmetry of the RF transceiver IC.

15. The local oscillation circuitry of claim 13, wherein the splitting circuit of the local oscillation distribution circuitry resides substantially along a center line of symmetry of the RF transceiver IC.

16. The local oscillation circuitry of claim 13, wherein the first distribution portion and the second distribution portion of the local oscillation distribution circuitry reside in substantial symmetry about a center line of symmetry of the RF transceiver IC.

17. The local oscillation circuitry of claim 13, wherein each of the first distribution portion and the second distribution portion comprise a plurality of drivers and at least one divider.

18. The local oscillation circuitry of claim 13, wherein:

a sequential order of position of the first transceiver group components from a center line of symmetry of the RF transceiver IC is the second RF band transmitter, the first RF band transmitter, the second RF band receiver, and the first RF band receiver;

a sequential order of position of the second transceiver group components from the center line of symmetry of the RF transceiver integrated circuit is the second RF band transmitter, the first RF band transmitter, the second RF band receiver, and the first RF band receiver;

the first distribution portion is operable to provide the second oscillation to the second RF band transmitter, the first oscillation to the first RF band transmitter, the second oscillation to the second RF band receiver, and the first oscillation to the first RF band receiver of the first transceiver group; and

the second distribution portion is operable to provide the second oscillation to the second RF band transmitter, the first oscillation to the first RF band transmitter, the second oscillation to the second RF band receiver, and the first oscillation to the first RF band receiver of the second transceiver group.

19. The local oscillation circuitry of claim 13, wherein:

a sequential order of position of the first transceiver group components from the center line of symmetry of the RF transceiver IC is the second RF band transmitter, the second RF band receiver, the first RF band transmitter, and the first RF band receiver;

a sequential order of position from the center line of symmetry of the RF transceiver integrated circuit of the second transceiver group components is the second RF band transmitter, the second RF band receiver, the first RF band transmitter, and the first RF band receiver;

the first distribution portion is operable to provide the second oscillation to the second RF band transmitter, the second oscillation to the second RF band receiver, the first oscillation to the first RF band transmitter, and the first oscillation to the first RF band receiver of the first transceiver group; and

the second distribution portion is operable to provide the second oscillation to the second RF band transmitter, the second oscillation to the second RF band receiver, the first oscillation to the first RF band transmitter, and the first oscillation to the first RF band receiver of the second transceiver group.

20. The local oscillation circuitry of claim 13, wherein:

when the first RF transceiver group and/or the second RF transceiver group is servicing communications in the second RF band, the local oscillation corresponds to the second local oscillation; and

when the first RF transceiver group and/or the second RF transceiver group is servicing communications in the first RF band, the local oscillation corresponds to an integer multiple of the first local oscillation.