FREQUENCY AND/OR PHASE COMPENSATED MICROELECTROMECHANICAL OSCILLATOR
First Claim
1. A system for generating a timing signal comprising:
- a microelectromechanical system (MEMS) resonator;
drive circuitry coupled to the MEMS resonator and configured to drive the MEMS resonator with a drive signal to generate a reference signal having a first frequency;
a memory device storing compensation data;
control circuitry coupled to the memory device and configured to generate a set of values based on the compensation data and one or more operating temperature readings; and
frequency adjustment circuitry coupled to the control circuitry and configured to;
receive the reference signal generated by the MEMS resonator,receive the set of values generated by the control circuitry, andbased on the reference signal and the set of values, generate a timing signal having a second frequency that is different from the first frequency.
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Accused Products
Abstract
There are many inventions described and illustrated herein. In one aspect, the present invention is directed to a compensated microelectromechanical oscillator, having a microelectromechanical resonator that generates an output signal and frequency adjustment circuitry, coupled to the microelectromechanical resonator to receive the output signal of the microelectromechanical resonator and, in response to a set of values, to generate an output signal having second frequency. In one embodiment, the values may be determined using the frequency of the output signal of the microelectromechanical resonator, which depends on the operating temperature of the microelectromechanical resonator and/or manufacturing variations of the microelectromechanical resonator. In one embodiment, the frequency adjustment circuitry may include frequency multiplier circuitry, for example, PLLs, DLLs, digital/frequency synthesizers and/or FLLs, as well as any combinations and permutations thereof. The frequency adjustment circuitry, in addition or in lieu thereof, may include frequency divider circuitry, for example, DLLs, digital/frequency synthesizers (for example, DDS) and/or FLLs, as well as any combinations and permutations thereof.
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Citations
24 Claims
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1. A system for generating a timing signal comprising:
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a microelectromechanical system (MEMS) resonator; drive circuitry coupled to the MEMS resonator and configured to drive the MEMS resonator with a drive signal to generate a reference signal having a first frequency; a memory device storing compensation data; control circuitry coupled to the memory device and configured to generate a set of values based on the compensation data and one or more operating temperature readings; and frequency adjustment circuitry coupled to the control circuitry and configured to; receive the reference signal generated by the MEMS resonator, receive the set of values generated by the control circuitry, and based on the reference signal and the set of values, generate a timing signal having a second frequency that is different from the first frequency. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A system for generating a timing signal comprising:
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a microelectromechanical system (MEMS) resonator; drive circuitry coupled to the MEMS resonator and configured to drive the MEMS resonator with a drive signal to generate a reference signal having a first frequency; a memory device storing compensation data; control circuitry coupled to the memory device and configured to generate a set of values based on the compensation data and one or more operating temperature readings; temperature compensation circuitry coupled to the control circuitry and the MEMS resonator and configured to provide the one or more operating temperature readings to the control circuitry; and a fractional-N synthesizer comprising a charge pump, a phase detector, a loop filter, a voltage controlled oscillator, and a divider, wherein the factional-N synthesizer is coupled to the control circuitry and configured to; receive the reference signal generated by the MEMS resonator, receive the set of values generated by the control circuitry, and based on the reference signal and the set of values, generate a timing signal having a second frequency that is different from the first frequency. - View Dependent Claims (23, 24)
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Specification