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

• US 7,787,569 B2
• Filed: 12/18/2006
• Issued: 08/31/2010
• Est. Priority Date: 07/26/2006
• Status: Active Grant

• Current Assignee: Avago Technologies International Sales Pte Limited (Broadcom, Inc.)
• Original Assignee: Broadcom Corporation (Broadcom, Inc.)
• Inventors: Chu, Mike (Hon Fai), Rofougaran, Maryam, Gelman, Anatoly, Hayem, Frederic Christian Marc, Darabi, Hooman, Rofougaran, Ahmadreza (Reza), Puttegowda, Kiran, Hayek, Claude G., Sollenberger, Nelson R., Patel, Ronish
• Primary Examiner(s): Payne; David C
• Assistant Examiner(s): File; Erin M
• Application Number:
  US11/641,562
• Publication Number:
  US 20080024339A1
• Time in Patent Office: 1,352 Days
• Field of Search: 324/309, 327/156, 342/70, 375/144, 375/148, 375/316, 455/553.1, 455/87, 455/269, 455/318, 455/76, 455/63.1
• US Class Current: 375/316
• CPC Class Codes: H04B 15/06 by local oscillators of receivers

Abstract

A radio frequency integrated circuit (RFIC) includes a low noise amplifier that amplifies an inbound radio frequency (RF) signal to produce an amplified RF signal. A down conversion module converts the amplified RF signal to a down converted signal based on a local oscillation. An analog to digital conversion (ADC) module coupled to convert the down converted signal into a digital signal. A baseband processing module converts 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 A clock module produces the plurality of baseband clock signals, wherein the clock module detects an interference condition when frequency dependent noise components associated with at least one of the plurality of baseband clock signals are inside a frequency band associated with the inbound RF signal, and spreads 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 low noise amplifier coupled to amplify an inbound radio frequency (RF) signal to produce an amplified RF signal;

a down conversion module coupled to convert the amplified RF signal to a down converted signal based on a local oscillation;

an analog to digital conversion (ADC) module coupled to convert the down converted signal into a digital 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 wherein the at least one function of the baseband processing module includes at least one of intermediate frequency to baseband conversion, fast Fourier transform, demapping, deinterleaving, decoding, and descrambling; and

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

2. The RFIC of claim 1 wherein the ADC conversion module is clocked by an ADC clock signal and wherein the clock module produces the ADC clock signal at a rate such that frequency dependent noise components associated with the ADC clock signal are outside the frequency band associated with the inbound RF signal.

3. The RFIC of claim 1 wherein the ADC conversion module is clocked by 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, and that spreads the spectrum of the ADC clock signal when the interference condition is detected.

4. The RFIC of claim 3, wherein the down conversion module comprises:

a local oscillation module coupled to generate the local oscillation based on the operation dependent clock signal.

5. The RFIC of claim 4, wherein the down conversion module further comprises:

a mixing module coupled to mix the local oscillation with the amplified RF signal to produce first and second mixed signals; and

a filtering module coupled to filter the first and second mixed signals to produce an in-phase component and a quadrature component of the down converted signal.

6. 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.

7. The RFIC of claim 6 wherein the plurality of spectrum adjust modules are arranged in a parallel configuration.

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

a low noise amplifier coupled to amplify an inbound radio frequency (RF) signal to produce an amplified RF signal;

a down conversion module coupled to convert the amplified RF signal to a down converted signal based on a local oscillation;

an analog to digital conversion (ADC) module coupled to convert the down converted signal into a digital 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 when frequency dependent noise components associated with at least one of the plurality of baseband clock signals are inside a frequency band associated with the inbound RF signal, and that spreads the spectrum of the at least one of the plurality of baseband clock signals when the interference condition is detected.

9. The RFIC of claim 8 wherein the ADC conversion module is clocked by an ADC clock signal and wherein the clock module produces the ADC clock signal at a rate such that frequency dependent noise components associated with the ADC clock signal are outside the frequency band associated with the inbound RF signal.

10. The RFIC of claim 8 wherein the ADC conversion module is clocked by 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, and that spreads the spectrum of the ADC clock signal when the interference condition is detected.

11. The RFIC of claim 8, 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.

12. The RFIC of claim 11 wherein the plurality of spectrum adjust modules are arranged in a parallel configuration.

13. The RFIC of claim 8, wherein the down conversion module comprises:

a local oscillation module coupled to generate the local oscillation based on the operation dependent clock signal.

14. The RFIC of claim 13, wherein the down conversion module further comprises:

a mixing module coupled to mix the local oscillation with the amplified RF signal to produce first and second mixed signals; and

a filtering module coupled to filter the first and second mixed signals to produce an in-phase component and a quadrature component of the down converted signal.

15. The RFIC of claim 8, wherein the baseband processing module is operable to perform at least one of:

intermediate frequency to baseband conversion;

fast Fourier transform;

demapping;

deinterleaving;

decoding; and

descrambling.

16. A method comprising:

amplifying an inbound radio frequency (RF) signal to produce an amplified RF signal;

converting the amplified RF signal to a down converted signal based on a local oscillation;

converting the down converted signal into a digital signal;

generating a plurality of baseband clock signals, by detecting an interference condition when frequency dependent noise components associated with at least one of the plurality of baseband clock signals are inside a frequency band associated with the inbound RF signal, and spreading the spectrum of the at least one of the plurality of baseband clock signals when the interference condition is detected; and

converting the digital signal into inbound data based on at least one function that is clocked by the plurality of baseband clock signals.

17. The method of claim 16 further comprising

generating an analog to digital conversion (ADC) clock signal at a rate such that frequency dependent noise components associated with the ADC clock signal are outside the frequency band associated with the inbound RF signal;

wherein the step of converting the down converted signal into a digital signal is performed based on the ADC clock signal.

18. The method of claim 16 further comprising

generating an analog to digital conversion (ADC) clock signal;

detecting 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; and

spreading the spectrum of the ADC clock signal when the interference condition is detected;

wherein the step of converting the down converted signal into a digital signal is performed based on the ADC clock signal.

19. The method of claim 18, further comprising:

generating the local oscillation based on an operation dependent clock signal.

20. The method of claim 16, wherein the step of generating the plurality of baseband clock signals includes generating an operation dependent clock signal, and spreading the spectrum of the operation dependent clock signal to produce the plurality of baseband clock signals.

21. The method of claim 20, wherein the step of converting the amplified RF signal to a down converted signal further comprises:

mixing the local oscillation with the amplified RF signal to produce first and second mixed signals; and

filtering the first and second mixed signals to produce an in-phase component and a quadrature component of the down converted signal.

22. The method of claim 16, wherein the at least one function that is clocked by the plurality of baseband clock signals includes at least one of:

intermediate frequency to baseband conversion;

fast Fourier transform;

demapping;

deinterleaving;

decoding; and

descrambling.

23. A method for generating a plurality of baseband clock signals, the method comprising:

detecting an interference condition when frequency dependent noise components associated with at least one of the plurality of baseband clock signals are inside a frequency band associated with an inbound RF signal; and

spreading the spectrum of the at least one of the plurality of baseband clock signals when the interference condition is detected.