The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 04, 2015
Filed:
Apr. 15, 2014
Commissariat a L'energie Atomique ET Aux Energies Alternatives, Paris, FR;
Patrick Villard, Grenoble, FR;
Gerard Billiot, St Nazaire les Eymes, FR;
Abstract
In the field of nanoresonator oscillators or NEMS (nanoelectromechanical systems) oscillators, a circuit is proposed for measuring the oscillation frequency of a resonator, including a phase-locked loop with a frequency-controlled oscillator and a phase comparator. The resonator includes a vibration excitation input and a dynamic polarization input (using strain gauges). The frequency-controlled oscillator applies a polarization frequency f1 to the polarization input. A frequency generator supplies a fixed intermediate frequency FI; a mixer receives the frequencies f1 and FI for producing an excitation frequency f0 that is the sum or difference of f1 and FI. The phase comparator receives the frequency FI and the output signal of the resonator and produces a control signal that is sent to the frequency-controlled oscillator, indirectly locking the oscillation frequency onto the resonant frequency of the resonator.