Radio frequency integrated circuit having frequency dependent noise mitigation with spectrum spreading

• US 8,170,146 B2
• Filed: 07/24/2010
• Issued: 05/01/2012
• Est. Priority Date: 07/26/2006
• Status: Expired due to Fees

• Current Assignee: Avago Technologies International Sales Pte Limited (Broadcom, Inc.)
• Original Assignee: Broadcom Corporation (Broadcom, Inc.)
• Inventors: Hayem, Frederic Christian Marc, Darabi, Hooman, Chu, Hon Fai (Mike), Gelman, Anatoly, Puttegowda, Kiran, Rofougaran, Ahmadreza (Reza), Rofougaran, Maryam, Hayek, Claude G., Sollenberger, Nelson R., Patel, Ronish
• Primary Examiner(s): Payne, David C.
• Assistant Examiner(s): FILE, ERIN M
• Application Number:
  US12/843,016
• Publication Number:
  US 20100310010A1
• Time in Patent Office: 647 Days
• Field of Search: 375/316
• US Class Current: 375/316
• CPC Class Codes: H04B 15/06 by local oscillators of receivers

Abstract

A plurality of baseband clock signals by detecting an interference condition associated with at least one of the plurality of baseband clock signals and by spreading the spectrum of the at least one of the plurality of baseband clock signals when the interference condition is detected.

Claims

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

a radio receiver front end coupled to produce a digital signal from an inbound RF signal;

a baseband processing module coupled to convert the digital signal into inbound data, wherein at least one function of the baseband processing module is clocked by a plurality of baseband clock signals; and

a clock module coupled to produce the plurality of baseband clock signals, wherein the clock module detects an interference condition caused by frequency dependent noise components associated with at least one of the plurality of baseband clock signals inside a frequency band associated with the inbound RF signal and that selectively spreads the spectrum of the at least one of the plurality of baseband clock signals based on when the interference condition is detected.

2. The RFIC of claim 1 wherein the plurality of baseband clock signals includes an ADC clock signal and wherein the clock module detects the interference condition when frequency dependent noise components associated with the ADC clock signal are inside a frequency band associated with the inbound RF signal.

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

a clock source that generates an operation dependent clock signal; and

a plurality of spectrum adjust modules, that generate the plurality of baseband clock signals from the operation dependent clock signal.

4. The RFIC of claim 3 wherein the plurality of spectrum adjust modules are arranged in a parallel configuration.

5. A radio frequency integrated circuit (RFIC) comprising:

a radio receiver front end coupled to produce a digital signal from an inbound RF signal;

a baseband processing module coupled to convert the digital signal into inbound data, wherein at least one function of the baseband processing module is clocked by a plurality of baseband clock signals; and

a clock module coupled to produce the plurality of baseband clock signals, wherein the clock module detects an interference condition caused by frequency dependent noise components associated with at least one of the plurality of baseband clock signals inside a frequency band associated with the inbound RF signal.

6. The RFIC of claim 5 wherein the clock module selectively spreads the spectrum of the at least one of the plurality of baseband clock signals based on when the interference condition is detected.

7. The RFIC of claim 5 wherein the plurality of baseband clock signals includes an ADC clock signal and wherein the clock module detects the interference condition when frequency dependent noise components associated with the ADC clock signal are inside a frequency band associated with the inbound RF signal.

8. The RFIC of claim 5, wherein the clock module comprises:

a clock source that generates an operation dependent clock signal; and

a plurality of spectrum adjust modules, that generate the plurality of baseband clock signals from the operation dependent clock signal.

9. The RFIC of claim 8 wherein the plurality of spectrum adjust modules are arranged in a parallel configuration.