Beamforming RF circuit and applications thereof

• US 7,714,780 B2
• Filed: 03/10/2006
• Issued: 05/11/2010
• Est. Priority Date: 03/10/2006
• Status: Active Grant

• Current Assignee: Avago Technologies International Sales Pte Limited (Broadcom, Inc.)
• Original Assignee: Broadcom Corporation (Broadcom, Inc.)
• Inventors: Rofougaran, Ahmadreza (Reza)
• Primary Examiner(s): Alsomiri; Isam
• Assistant Examiner(s): Mull; Fred H
• Application Number:
  US11/372,560
• Publication Number:
  US 20070210960A1
• Time in Patent Office: 1,523 Days
• Field of Search: 342369-372
• US Class Current: 342/369
• CPC Class Codes: H01Q 3/26 varying the relative phase or relative amplitude of energisation between two or more active radiating elements; varying the distribution of energy across a radiating aperture H01Q3/12, H01Q3/22, H01Q3/24 take precedence

Abstract

A beamforming radio frequency (RF) circuit includes a plurality of antennas, a plurality of amplifiers and an adjust module. The plurality of antennas is operably coupled to interrelate a plurality of beamformed signal components with a beamformed signal. The plurality of amplifiers is operably coupled to interrelate the plurality of beamformed signal components with a plurality of adjusted signal components. The adjust module is operably coupled to interrelate coordinates of a signal with the plurality of adjusted signal components.

Claims

1. A radio frequency integrated circuit (RFIC) comprises:

baseband processing module configured to convert outbound data into an outbound baseband signal;

an up-conversion module configured to convert the outbound baseband signal into an outbound RF signal;

an adjust module configured to adjust coordinates of the outbound RF signal to produce a plurality of RF signal components, wherein the adjust module comprises, for each of the plurality of RF signal components;

a first gain stage to amplify an I component of the outbound RF signal in accordance with a first gain value to produce a gained I component;

a second gain stage to amplify a Q component of the outbound RF signal in accordance with a second gain value to produce a gained Q component; and

an adder operably coupled to add the gained I component and the gained Q component to produce a corresponding one of the plurality of RF signal components, wherein the first and second gain values are based on a beamforming factor;

a plurality of power amplifiers configured to amplify the plurality of RF signal components output by the adjust module to produce a plurality of amplified RF signal components, wherein one or more of the plurality of power amplifiers have different gain settings based on the beamforming factor, and wherein the plurality of power amplifiers provide the plurality of amplified RF signal components to a plurality of antennas that transmit the plurality of amplified RF signal components to produce a beamformed RF signal having, in air, a desired coordinate.

2. The RFIC of claim 1, wherein the adjust module further functions to adjust transmit power of at least one of the plurality of power amplifiers based on the beamforming factor.

3. The RFIC of claim 1, wherein the adjust module further comprises:

a receiver configured to receive feedback from a targeted recipient of the beamformed RF signal; and

processing module configured to generate the beamforming factor based on the feedback, wherein the adjust module adjusts the coordinates of the outbound RF signal in accordance with the beamforming factor.

4. The RFIC of claim 3, the processing module further functions to:

sequentially adjust the coordinates of the outbound RF signal to produce a plurality of sequentially adjusted coordinates of the plurality of RF signal components;

for each of the plurality of sequentially adjusted coordinates of the plurality of RF signal components;

enabling transmission of the beamformed RF signal;

determining whether feedback is received for the beamformed RF signal;

when the feedback is received, saving the feedback with respect to a corresponding one of the plurality of sequentially adjusted coordinates of the plurality of RF signal components to produce saved feedback; and

determining the beamforming factor from the saved feedback.

5. The RFIC of claim 3, the processing module further functions to:

enabling transmission of the beamformed RF signal for a given adjustment of the coordinates of the plurality of RF signal components;

determining whether feedback is received for the beamformed RF signal;

when the feedback is received, determining whether the given adjustment of the coordinates of the plurality of RF signal components provides a desired level of transmission of the beamformed RF signal based on the feedback; and

when the given adjustment of the coordinates of the plurality of RF signal components does not provide the desired level of transmission of the beamformed RF signal, further adjusting the coordinates of the plurality of RF signal components until the desired level of transmission of the beamformed RF signal is obtained.