Resonator electrode shields
A microelectromechanical system (MEMS) resonator includes a resonant semiconductor structure, drive electrode, sense electrode and electrically conductive shielding structure. The first drive electrode generates a time-varying electrostatic force that causes the resonant semiconductor structure to resonate mechanically, and the first sense electrode generates a timing signal in response to the mechanical resonance of the resonant semiconductor structure. The electrically conductive shielding structure is disposed between the first drive electrode and the first sense electrode to shield the first sense electrode from electric field lines emanating from the first drive electrode.
1. A microelectromechanical systems (MEMS) resonator system comprising:
system elements, including a body, a first electrode, a second electrode and one or more support structures, a first one of the first electrode and the second electrode to supply a stimulus to cause the body to vibrate during operation of the MEMS resonator system and a second one of the first electrode and the second electrode to sense a frequency of vibration of the body during operation of the MEMS resonator system, the one or more support structures supporting the body;
wherein further, the MEMS resonator system comprises a coupling shield configured to impede the existence of capacitive coupling between two or more of the system elements during operation of the MEMS resonator system.
2. The MEMS resonator system of claim 1 wherein the MEMS resonator system comprises an electrical contact, the electrical contact to provide a predetermined potential to the coupling shield.
3. The MEMS resonator system of claim 2 wherein the predetermined potential is one of a ground potential and a bias voltage.
4. The MEMS resonator system of claim 2 wherein the MEMS resonator system is configured to operate as an electrostatic resonator and wherein a first predetermined one of the first electrode and the second electrode is configured to always act as a drive electrode and wherein a second predetermined one of the first electrode and the second electrode is configured to always act as a sense electrode.
5. The MEMS resonator system of claim 1 wherein:
the body comprises a first beam and a second beam;
each of the first beam and the second beam has a longitudinal axis, a first end and a second end;
the longitudinal axis of the first beam is being parallel to the longitudinal axis of the second beam; and
the one or more support structures operatively mount the first end of first beam relative to the first end of the second beam.
6. The MEMS resonator system of claim 5 wherein the system elements further comprise a third electrode and wherein at least two of the first electrode, the second electrode and the third electrode, are to supply a time-varying electrical stimulus so as to cause each of the first beam and the second beam to vibrate during operation of the MEMS resonator system.
7. The MEMS resonator system of claim 6 wherein the coupling shield is configured to also impede the existence of capacitive coupling between the third electrode and at least one of the first electrode and the second electrode.
8. The MEMS resonator system of claim 1 wherein each of the first electrode and the second electrode is formed of doped silicon.
9. The MEMS resonator system of claim 1 wherein the coupling shield is to provide an electrical sink.
10. The MEMS resonator system of claim 1 wherein the coupling shield is mounted so as to impede the existence of capacitive coupling between a first support arm of the one or more support structures and a second support arm of the one or more support structures.
11. A microelectromechanical systems (MEMS) resonator system comprising:
system elements, including a body, a first electrode, a second electrode and one or more support structures, wherein
a first one of the first electrode and the second electrode is to supply a stimulus to cause the body to vibrate during operation of the MEMS resonator system,
a second one of the first electrode and the second electrode is to sense a frequency of vibration of the body during operation of the MEMS resonator system, and
the one or more support structures are to mount the body;
wherein further, the MEMS resonator system comprises at least one coupling shield configured to impede the existence of capacitive coupling between two or more of the system elements during operation of the MEMS resonator system.
12. The MEMS resonator system of claim 11 wherein the MEMS resonator system comprises an electrical contact, the electrical contact to provide a predetermined potential to the at least one coupling shield.
13. The MEMS resonator system of claim 12 wherein the predetermined potential is one of a ground potential and a bias voltage.
14. The MEMS resonator system of claim 12 wherein the MEMS resonator system is configured to operate as an electrostatic resonator and wherein a first predetermined one of the first electrode and the second electrode is configured to always act as a drive electrode and wherein a second predetermined one of the first electrode and the second electrode is configured to always act as a sense electrode.
15. The MEMS resonator system of claim 11 wherein:
the body comprises a first beam and a second beam;
each of the first beam and the second beam has a longitudinal axis, a first end and a second end;
the longitudinal axis of the first beam is being parallel to the longitudinal axis of the second beam; and
the one or more support structures operatively mount the first end of first beam relative to the first end of the second beam.
16. The MEMS resonator system of claim 15 wherein the system elements further comprise a third electrode and wherein at least two of the first electrode, the second electrode and the third electrode, are to supply a time-varying electrical stimulus so as to cause each of the first beam and the second beam to vibrate during operation of the MEMS resonator system.
17. The MEMS resonator system of claim 16 wherein a shield of the at least one coupling shield is configured to also impede the existence of capacitive coupling between the third electrode and at least one of the first electrode and the second electrode.
18. The MEMS resonator system of claim 11 wherein each of the first electrode and the second electrode is formed of doped silicon.
19. The MEMS resonator system of claim 11 wherein a shield of the at least one coupling shield is to provide an electrical sink.
20. The MEMS resonator system of claim 11 wherein a shield of the at least one coupling shield is mounted so as to impede the existence of capacitive coupling between a first support arm of the one or more support structures and a second support arm of the one or more support structures.