Oscillators – Frequency stabilization – Temperature or current responsive means in circuit
Reexamination Certificate
2007-06-28
2009-08-18
Chang, Daniel D (Department: 2819)
Oscillators
Frequency stabilization
Temperature or current responsive means in circuit
C455S076000, C455S260000, C375S376000
Reexamination Certificate
active
07576621
ABSTRACT:
Film bulk acoustic resonators (FBARS) have resonant frequencies that vary with manufacturing variations, but tend to be matched when in proximity on an integrated circuit die. FBAR resonant frequency is determined using a fractional-N synthesizer and comparing phase/frequency of an output signal from the fractional-N synthesizer to a reference. The reference may be derived from a low frequency crystal oscillator, an external signal source, or a communications signal.
REFERENCES:
patent: 7449968 (2008-11-01), Cioffi et al.
Degani Ofir
Krishnamurthy Soumyanath
Lakdawala Hasnain
Ravi Ashoke
Sajadieh Masoud
Chang Daniel D
Intel Corporation
Lemoine Dana B.
Lemoine Patent Services, PLLC
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