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US 12,224,709 B1Granted
Cascaded oscillator designs
AssigneeSiTime Corporation
InventorsAaron Partridge, Sassan Tabatabaei, Lijun Chen, Kamran Souri
Life of this patent
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Abstract
An oscillator includes a resonator, sustaining circuit and detector circuit. The sustaining circuit receives a sense signal indicative of mechanically resonant motion of the resonator generates an amplified output signal in response. The detector circuit asserts, at a predetermined phase of the amplified output signal, one or more control signals that enable an offset-reducing operation with respect to the sustaining amplifier circuit.
Claims31
An oscillator integrated circuit device comprising:
- a first microelectromechanical systems (MEMS) resonator that produces a first timing signal;
- a second MEMS resonator that produces a second timing signal;
- a locked-loop circuit that receives each of the first timing signal and the second timing signal;
- and
- wherein the locked-loop circuit produces an output timing signal that tracks phase noise of the first resonator below a first frequency and that tracks phase noise of the second resonator above the first frequency;
- and
- wherein the first MEMS resonator is characterized by lower near phase noise than the second MEMS resonator.
4 more elements
An oscillator integrated circuit device comprising:
- a first MEMS resonator that produces a first timing signal, the first MEMS resonator being an electrostatic resonator;
- a second MEMS resonator that produces a second timing signal;
- a locked-loop circuit that receives each of the first timing signal and the second timing signal, the locked-loop circuit configured to produce an output timing signal that tracks phase noise of the first resonator below a first frequency and that tracks phase noise of the second resonator above the first frequency;
- and
- a contact or pin to receive the output timing signal for output by oscillator integrated circuit device;
- wherein the first MEMS resonator is characterized by lower near phase noise than the second MEMS resonator and wherein the second MEMS resonator is characterized by lower far phase noise than the first MEMS resonator.
3 more elements
Dependencies are inferred from the claim text.