System and method for using MEMS filter bank

• US 20090237179A1
• Filed: 12/11/2008
• Published: 09/24/2009
• Est. Priority Date: 12/11/2007
• Status: Active Grant

• Current Assignee: General Dynamics Mission Systems Inc. (General Dynamics Corporation)
• Original Assignee: General Dynamics Advanced Information Systems Incorporated (General Dynamics Corporation)
• Inventors: Chen, Ting-Yin
• Granted Patent: US 7,898,364 B2
• Time in Patent Office: Days
• US Class Current: 333/186
• CPC Class Codes: H03H 9/2447 Beam resonators H03H9/2468 takes precedence
• CPC Class Codes: H03H 9/462 Microelectro-mechanical filters
• CPC Class Codes: H03H 9/465 in combination with other electronic elements

Abstract

A method and apparatus for recovering at least one signal of interest are provided. The method includes receiving an overall signal, the overall signal including the at least one signal of interest and a plurality of other signals, identifying at least one of the strongest components of the plurality of other signals, attenuating, using at least one MEMS resonator, any of the components identified by the identifying, wherein the overall signal will be modified to include the at least one signal of interest, attenuated versions of the components identified by the identifying, and the remaining portions of the plurality of other signals that were not subject to the attenuating, and recovering, after the attenuating, the at least one signal of interest.

Claims

1. A method for recovering at least one signal of interest, comprising:

receiving an overall signal, the overall signal including the at least one signal of interest and a plurality of other signals;

identifying at least one of the strongest components of the plurality of other signals;

attenuating, using at least one MEMS resonator, any of the components identified by said identifying, wherein the overall signal will be modified to include the at least one signal of interest, attenuated versions of the components identified by said identifying, and the remaining portions of the plurality of other signals that were not subject to the attenuating; and

recovering, after the attenuating, the at least one signal of interest.

2. The method of claim 1, further comprising:

determining, after the receiving, whether the at least one signal of interest is recoverable from the overall signal without requiring attenuation of at least one of the strongest components of the plurality of other signals; and

wherein said identifying, attenuating, and recovering are all contingent upon a negative result of said determining.

3. The method of claim 1, further comprising:

augmenting the modified overall signal after said attenuating and before said recovering.

4. The method of claim 1, wherein the at least one MEMS resonator includes a plurality of MEMS resonators, each configured to resonate at a different frequency range, said attenuating further comprising:

resonating each individual MEMS resonator with a frequency range overlapping with the at least one of the strongest components, thereby providing a shunt to ground.

5. The method of claim 1, wherein the at least one signal of interest is substantially unaffected by said attenuating.

6. The method of claim 1, wherein the at least one signal of interest is not subject to any filtering by said attenuating.

7. The method of claim 1, further comprising:

receiving a master signal;

passing said master signal through a band pass filter; and

wherein the overall signal is the output of the band pass filter.

8. The method of claim 1, wherein said recovering comprises selecting the at least one signal of interest from either the overall signal or the modified overall signal.

9. The method of claim 1, further comprising:

iteratively applying said identifying and attenuating to thereby produce a plurality of modified signals; and

said recovering comprising selecting the at least one signal of interest from one of the overall signal or the plurality of modified overall signals.

10. The method of claim 1, further comprising:

generating, in response to the identifying, control signals for said MEMS filter bank, the control signals being configured to selectively activate individual MEMS resonators that have frequency ranges that at least partially overlap with the identified strong components; and

said attenuating comprising resonating the individual MEMS filters under control of the control signals to shunt the strong components to ground.

11. A method for recovering at least one signal of interest, comprising:

receiving an overall signal, the overall signal including a signal of interest component and an interference component;

identifying dominant portions of the interference component;

processing the overall signal to produce a processed overall signal, said processing comprising attenuating the dominant portions of the interference component using a MEMS filter bank without any significant attenuation of the signal component or the non-dominant portions of the interference component; and

attempting to recover the signal of interest component from the process signal.

12. The method of claim 11, further comprising:

determining, after the receiving, whether the signal of interest component is recoverable from the overall signal without requiring attenuation of the dominant portions of the plurality of the interference component; and

wherein said identifying, processing and attempting are all contingent upon a negative result of said determining.

13. The method of claim 11, further comprising:

augmenting the processed overall signal after said processing and before said attempting.

14. The method of claim 11, wherein the MEMS filter bank includes a plurality of MEMS resonators, each configured to resonate at a different frequency range, said processing further comprising:

resonating each individual MEMS resonator with a frequency range overlapping with the dominant portions, thereby providing a shunt to ground.

15. The method of claim 11, wherein the signal of interest component is substantially unaffected by said processing.

16. The method of claim 11, wherein the signal of interest component is not subject to any filtering by said processing.

17. The method of claim 11, further comprising:

receiving a master signal;

passing said master signal through a band pass filter; and

wherein the overall signal is the output of the band pass filter.

18. The method of claim 11, wherein said attempting comprises selecting the signal of interest component from either the overall signal or the processed overall signal.

19. The method of claim 11, further comprising:

iteratively applying said identifying and processing to thereby produce a plurality of processed signals; and

said attempting comprising selecting the one signal of interest component from one of the overall signal or the plurality of processed overall signals.

20. The method of claim 11, further comprising:

generating, in response to the identifying, control signals for the MEMS filter bank, the controls signals being configured to selectively activate individual MEMS resonators that have frequency ranges that at least partially overlap with the identified dominant portion; and

said processing comprising resonating the individual MEMS filters under control of the control signals to shunt the strong components to ground.

21. An apparatus for reducing interference in an incoming signal traveling along a signal pathway, comprising:

a bank of MEMS resonators, each of said resonators having an ON and OFF state;

each of said resonators having an individual resonance frequency range collectively defining a frequent range of the bank;

an electrode having a first end connected to the signal path, and a body connected to each of said MEMS resonators; and

each of the MEMS resonators having a pathway to ground;

wherein each individual resonator with the bank responds to the signal as follows;

when the individual resonator is ON and the signal includes a component at a frequency that falls within the individual resonance frequency range of the particular resonator, the individual resonator will resonate in response to the signal and at least partially shunt the component to ground, thereby attenuating that component of the signal with substantially no impact on portions of the signal at frequencies outside the individual frequency range; and

when the individual resonator is OFF, or when the individual resonator is ON and the signal does not include a component at a frequency that falls within the individual resonance frequency range of the particular resonator, the individual resonator will have substantially no impact on the signal;

wherein the bank of MEMS resonators is configured to attenuate portions of the signal while having substantially no impact on the remainder of the signal.

22. The apparatus of claim 21, further comprising the individual resonance frequency range of each MEMS resonator substantially overlapping with at least on other MEMS resonator.

23. The apparatus of claim 21, wherein each MEMS resonator in said bank of MEMS resonators has a different length.

24. The apparatus of claim 21, further comprising a controller configured to:

analyze the signal at a point downstream of the signal pathway;

determine which individual MEMS resonators within said bank to turn ON and OFF; and

issue corresponding ON or OFF signals to the bank.

25. An apparatus for reducing interference in an incoming signal traveling along a signal pathway, comprising:

a plurality of banks MEMS resonators;

a plurality of amplifiers, each located downstream of a respective bank of MEMS resonators;

the output of each amplifier being connected to an available downstream one of the plurality of banks of MEMS resonators, to thereby iteratively process the signal;

a controller configured to receive the signal and the output of each amplifier, the controller being configured to issue control signals to individual MEMS resonators with the plurality of banks of MEMS resonators, and to thereby attenuate interference components with the incoming signal; and

wherein a signal of interest will be recoverable from either the incoming signal or the output of at least one of the amplifiers.

26. The apparatus of claim 25, wherein each individual bank of MEMS resonators within the plurality of banks further comprises:

each individual resonators with said bank having an ON and OFF state;

each of said individual MEMS resonators having an individual resonance frequency range collectively defining a frequent range of the bank;

an electrode having a first end connected to the signal path, and a body connected to each of said individual MEMS resonators; and

each of the individual MEMS resonators having a pathway to ground;

wherein each individual resonator with the bank responds to the signal as follows;

when the individual resonator is ON and the signal includes a component at a frequency that falls within the individual resonance frequency range of the particular resonator, the individual resonator will resonate in response to the signal and at least partially shunt the component to ground, thereby attenuating that component of the signal with substantially no impact on portions of the signal at frequencies outside the individual frequency range; and

when the individual resonator is OFF, or when the individual resonator is ON and the signal does not include a component at a frequency that falls within the individual resonance frequency range of the particular resonator, the individual resonator will have substantially no impact on the signal;

wherein the bank of MEMS resonators is configured to attenuate portions of the signal while having substantially no impact on the remainder of the signal.