Method and system for reducing signal interference

• US 7,522,883 B2
• Filed: 12/14/2005
• Issued: 04/21/2009
• Est. Priority Date: 12/14/2004
• Status: Expired due to Fees

• Current Assignee: Intersil Americas LLC (Renesas Electronics Corporation)
• Original Assignee: Quellan, Inc. (Renesas Electronics Corporation)
• Inventors: Laskar, Joy, Kim, Andrew Joo, Tentzeris, Emmanouil M., Gebara, Edward, Stelliga, Anthony
• Primary Examiner(s): PHAM, TUAN
• Application Number:
  US11/302,896
• Publication Number:
  US 20060178157A1
• Time in Patent Office: 1,224 Days
• Field of Search: 455/63.1, 455/63.3, 455/67.11, 455/278.1, 455/296, 385/100, 385/101, 385/114
• US Class Current: 455/63.1
• CPC Class Codes: H04B 1/123 using adaptive balancing or compensation means adaptive filter circuits and algorithms H03H
• CPC Class Codes: H04B 1/7103 the interference being multiple access interference

Abstract

Signals propagating on an aggressor communication channel can cause interference in a victim communication channel. A sensor coupled to the aggressor channel can obtain a sample of the aggressor signal. The sensor can be integrated with or embedded in a system, such as a flex circuit or a circuit board, that comprises the aggressor channel. The sensor can comprise a dedicated conductor or circuit trace that is near an aggressor conductor, a victim conductor, or an EM field associated with the interference. An interference compensation circuit can receive the sample from the sensor. The interference compensation circuit can have at least two operational modes of operation. In the first mode, the circuit can actively generate or output a compensation signal that cancels, corrects, or suppresses the interference. The second mode can be a standby, idle, power-saving, passive, or sleep mode.

Claims

1. A system for handling communication signals, comprising a flex circuit that comprises:

a first channel, operative to transmit first communication signals;

a second channel, coupled to the first channel via an interference effect, operative to receive second communication signals and to receive interference from the first transmitted communication signals via the interference effect; and

a sensor, electrically isolated from the first channel, operative to sense the first communication signals for input to an interference compensation circuit,

wherein the first channel comprises a first conductor attached to a substantially planar substrate and extending along a planar surface thereof,

wherein the second channel comprises a second conductor attached to the substantially planar substrate and extending along the planar surface thereof,

wherein the sensor comprises a third conductor attached to the substantially planar substrate, extending along the planar surface thereof, and separated from each of the first conductor and the second conductor, and

wherein the third conductor comprises a conductive segment extending alongside and substantially parallel to the first conductor, the conductive segment operative to receive a signal sample from the first conductor via coupling to an electromagnetic field of the first conductor.

2. The system of claim 1, wherein the sensor is isolated from the first channel below a threshold frequency and coupled to the first channel above the threshold frequency.

3. The system of claim 1, wherein the system comprises the interference compensation circuit, and wherein the interference compensation circuit is operative to function in an active mode for applying interference compensation and a standby mode.

4. The system of claim 1, wherein the system further comprises a power source connected to the interference compensation circuit, and

wherein the interference compensation circuit is operative to operate in each of an active mode and a passive mode and to obtain more power from the power source in the active mode than in the passive mode.

5. The system of claim 1, further comprising the interference compensation circuit,

wherein the interference compensation circuit is operative in a first mode to output an interference compensation signal based on the sensed first communication signals, and

wherein the interference compensation circuit is operative in a second mode to suspend outputting the interference compensation signal while consuming at least some power.

6. The system of claim 1, wherein the third conductor is adjacent the first conductor and is dedicated to sampling the first communication signals from the first conductor.

7. The system of claim 6, wherein the first conductor and the second conductor are embedded in a sheet of dielectric material, and

wherein the third conductor is essentially isolated from the first conductor in one electromagnetic frequency range and coupled to the first conductor in another electromagnetic frequency range.

8. The system of claim 1, where the sensor is adjacent the first conductor.

9. The system of claim 1, wherein the first conductor and the second conductor are disposed on a flexible film.

10. The system of claim 1, wherein the second conductor is disposed across the first conductor.

11. The system of claim 1, wherein the first channel comprises a data bus,

wherein the second channel comprises a radio antenna, and

wherein the sensor is a lane of the data bus that is dedicated to sensing.

12. The system of claim 1, wherein the first communication signals comprise digital signals,

wherein the second communication signals comprise wireless signals, and

wherein the system further comprises:

an imaging device operably connected to the first channel and operative to communicate the digital signals via the first channel; and

a receiver operably connected to the second channel and operative to process the wireless signals.

13. The system of claim 1, wherein the sensed first communication signals have intensity, and

wherein the interference compensation circuit is operative to output an interference correction signal in response to a determination that the intensity is above a threshold and to suspend outputting the interference correction signal in response to a determination that the intensity is below the threshold.

14. The system of claim 1, wherein the interference compensation circuit comprises an integrated circuit that is operative to produce an interference correction signal in response to processing the sensed first communication signals.

15. A system for handling communication signals, comprising:

a first electrically conductive trace disposed on a flex circuit, operative to transmit first communication signals;

a second electrically conductive trace, coupled to the first electrically conductive trace via an interference effect, operative to transmit or receive second communication signals and to receive interference from the first transmitted communication signals via the interference effect; and

a sensor comprising a third electrically conductive trace, disposed on the flex circuit substantially adjacent to the first electrically conductive trace and physically separated therefrom,

wherein the third electrically conductive trace comprises a substantially straight section that runs substantially parallel to the first electrically conductive trace and substantially parallel to a surface of the flex circuit, the substantially straight section operative to sample the first communication signals for processing by an interference compensation circuit that is operative to compensate for the received interference, and

wherein the substantially straight section of the third electrically conductive trace is isolated from the first electrically conductive trace in a first frequency range below a frequency and is coupled to the first electrically conductive trace in a second frequency range above the frequency.

16. The system of claim 15, wherein the interference compensation circuit is operative to transition to a standby mode in response to a receiver or a signal source of the system transitioning from a first predetermined state to a second predetermined state.

17. The system of claim 15, wherein the interference compensation circuit comprises a memory, and

wherein the interference compensation circuit is operative to:

in response to a receiver or a signal source of the system transitioning from a first predetermined state to a second predetermined state, store an operating parameter in the memory and transition from an active mode to a standby mode; and

in response to the receiver or signal source transitioning from the second predetermined state to the first predetermined state, retrieve the operating parameter from the memory and transition from the standby mode to the active mode.