Oscillators – With frequency calibration or testing
Reexamination Certificate
2007-11-13
2007-11-13
Chang, Joseph (Department: 2817)
Oscillators
With frequency calibration or testing
C331S179000
Reexamination Certificate
active
10667870
ABSTRACT:
A tuning circuit uses a VCO with a trimming capacitor bank. The trimming capacitor bank is calibrated by logic to accommodate a desired frequency, fwanted. A search renders an initial control word that is accurate within one LSB. In a first embodiment, comparisons between the desired frequency and the upper and lower frequency bounds of the VCO with the trimming capacitor bank configured by the initial control word. The control word may be increased or decreased based on the comparisons. In a second embodiment, differences between the desired frequency and the actual frequency of the VCO, with the trimming capacitor bank configured by the initial control word, are compared to a threshold. The control word may be increased or decreased based on the comparison.
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Coppola Francesco
Jiguet Jean-Christophe
Puccio Gianni
Brady III W. James
Chang Joseph
Neerings Ronald O.
Telecky , Jr. Frederick J.
Texas Instruments Incorporated
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