Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Synchronizing
Reexamination Certificate
2006-09-05
2006-09-05
Cunningham, Terry D. (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Synchronizing
C327S159000, C327S163000, C375S376000
Reexamination Certificate
active
07102403
ABSTRACT:
A clock recovering circuit for generating an output clock locked to an analog input signal includes: a phase detection unit for receiving the analog input signal and the output clock for generating a phase error signal according to the analog input signal and the output clock; a loop filter coupled to the phase detector for filtering the phase error signal and generating a control signal; a numerically controlled oscillator (NCO) coupled to the loop filter for generating a first clock and an index signal according to the control signal; a delay locked loop (DLL) coupled to the NCO for receiving the first clock and generating a plurality of second clocks; and a multiplexer coupled to the NCO and the DLL for selecting one of the second clocks as the output clock according to the index signal.
REFERENCES:
patent: 5977805 (1999-11-01), Vergnes et al.
patent: 6424185 (2002-07-01), Wolf
patent: 6983032 (2006-01-01), Mujica et al.
Cunningham Terry D.
Hsu Winston
Luu An T.
Mediatek Incorporation
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