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US 5,491,604 AGranted
Q-controlled microresonators and tunable electronic filters using such resonators
AssigneeThe Regents of the University of California
InventorsClark T.-C. Nguyen, Roger T. Howe
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Abstract
Resonator systems with controlled quality factors including a resonator having a plurality of ports and a first quality factor greater than the system quality factor, and an amplifier providing negative feedback among the ports to render the system quality factor independent of the resonator quality factor.
Claims19
A resonator system with a controlled quality factor, comprising:
- a resonator having first, second and third ports, and a quality factor greater than said controlled quality factor;
- an amplifier having an input and an output, and a gain high enough to render said controlled quality factor substantially independent of the quality factor of said resonator;
- and
- wherein said second port is connected to the input of said amplifier and the output of said amplifier is connected to said third port so that when an input signal is applied to the resonator system at said first port, an output signal at said second port is applied to the input of said amplifier, and an output of said amplifier is applied to said third port for providing negative feedback to said resonator.
1 more element
A resonator system with a controlled quality factor, comprising:
- an electromechanical resonator micromachined on a substrate, said resonator having first, second and third ports, and a quality factor greater than said controlled quality factor;
- an amplifier having an input and an output, and a gain high enough to render said controlled quality factor substantially independent of the quality factor of said resonator;
- and
- wherein said second port is connected to the input of said amplifier and the output of said amplifier is connected to said third port so that when an input signal is applied to the resonator system at said first port, and output signal at said second port is applied to the input of said amplifier, and an output of said amplifier is applied to said third port for providing negative feedback to said resonator.
1 more element
A method for operating a resonator system with a controlled quality factor, comprising:
- providing a resonator with first, second and third ports, and a quality factor greater than said controlled quality factor;
- providing an amplifier with an input and an output;
- applying an input signal to the resonator system at the first port of said resonator;
- applying an output signal from the second port of said resonator to the input of said amplifier;
- and
- applying a negative feedback to the third port of said resonator from the output of said amplifier, with a gain sufficiently high to render said controlled quality factor substantially independent of the quality factor of said resonator.
3 more elements
Dependencies are inferred from the claim text.