Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Synchronizing
Reexamination Certificate
2007-12-28
2010-10-05
Donovan, Lincoln (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Synchronizing
C327S147000
Reexamination Certificate
active
07808288
ABSTRACT:
Circuits and methods for an automatic coarse tuning in a phase locked loop (PLL) include observing a variation in a control voltage to disable a fine loop and to enable a coarse loop as the control voltage departs from a specified range. The circuit includes the fine loop, the coarse loop, and a control circuit. The fine loop includes a phase frequency detector (PFD), a charge pump, a loop filter, a VCO and a divider. The coarse loop includes a frequency detector, an up counter, a down counter, and an LC VCO. The control circuit includes a bandgap module, a comparator and other circuits such as a lock detect circuit. The control circuit is used to switch between the coarse loop and the fine loop.
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Donovan Lincoln
Graybeal Jackson LLP
Houston Adam D
Jablonski Kevin D.
Jorgenson Lisa K.
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