Systems and methods for digital synthesis of output signals using resonators
AssigneeMixed-Signal Devices Inc.
InventorsTommy Yu, Avanindra Madisetti
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Abstract
Systems and methods for digital synthesis of an output signal using a frequency generated from a resonator and computing amplitude values that take into account temperature variations and resonant frequency variations resulting from manufacturing variability are described. A direct frequency synthesizer architecture is leveraged on a high Q resonator, such as a film bulk acoustic resonator (FBAR), a spectral multiband resonator (SMR), and a contour mode resonator (CMR) and is used to generate pristine signals.
Claims14
A direct frequency synthesizer comprising:
- a high speed resonator that generates a frequency signal;
- an oscillator that receives the frequency signal and generates an output signal;
- a clock generator that receives the output signal of the oscillator and generates a clock signal from the output signal;
- a controller that generates a frequency control word describing a desired output digital signal;
- and
- a direct digital frequency synthesizer that receives the clock signal and the frequency control word and generates the desired output digital signal based on the clock signal and frequency control word;
- and
- frequency compensation circuitry that generates a frequency compensation value to adjust for errors in the frequency signal generated by the high speed resonator and adds the frequency compensation value to the frequency control word, wherein the frequency compensation circuitry comprises frequency offset correction circuitry that accounts for resonant frequency offsets in the frequency signal generated by the high speed resonator due to properties of the resonator and provides frequency offset information to the frequency compensation circuitry to generate the frequency compensation value.
A method for generating a signal from a high speed resonator comprising:
- generating a frequency signal using a high speed resonator receiving the frequency signal in an oscillator;
- generating an output signal from the frequency signal using the oscillator;
- receiving the output signal of the oscillator in a clock generator;
- generating a clock signal from the output signal of the oscillator using the clock generator;
- generating a frequency control word describing a desired output digital signal using a controller;
- receiving the clock signal and the frequency control word in a direct digital frequency synthesizer;
- and
- generating the desired output digital signal based on the clock signal and frequency control word using the direct digital frequency synthesizer;
- generating a frequency compensation value to adjust for errors in the frequency signal generated by the high speed resonator using frequency compensation circuitry;
- and
- adding the frequency compensation value to the frequency control word, wherein the frequency compensation circuitry comprises accounting for resonant frequency offsets in the frequency signal generated by the high speed resonator due to properties of the resonator and providing frequency offset information to the frequency compensation circuitry to generate the frequency compensation value.
Dependencies are inferred from the claim text.