Pulse or digital communications – Synchronizers – Phase displacement – slip or jitter correction
Reexamination Certificate
2006-02-28
2006-02-28
Corrielus, Jean B. (Department: 2637)
Pulse or digital communications
Synchronizers
Phase displacement, slip or jitter correction
C327S105000, C331S03600C, C331S17700V
Reexamination Certificate
active
07006589
ABSTRACT:
A transmitter (10) based on a frequency synthesizer includes an LC tank (12) of a digitally controlled oscillator (DCO) with various arrays of capacitors. The LC tank12is divided into two major groups that reflect two general operational modes: acquisition and tracking. The first group (process/voltage/temperature and acquisition) approximately sets the desired center frequency of oscillation initially, while the second group (integer and fractional tracking) precisely controls the oscillating frequency during the actual operation. For highly accurate outputs, dynamic element matching (DEM) is used in the integer tracking controller to reduce non-linearities caused by non-uniform capacitor values. Also, a preferred range of the integer tracking capacitor array may be used for modulation after the selected channel has been acquired. A digital sigma-delta modulator circuit (50) drives a capacitor array (14d) in response to the fractional bits of the error word. On mode switches, the accumulated error is recalculated to a phase restart value to prevent perturbations.
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Maggio Ken
Staszewski Robert B.
Brady III W. James
Corrielus Jean B.
Neerings Ronald O.
Telecky , Jr. Frederick J.
Texas Instruments Incorporated
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