Coded data generation or conversion – Analog to or from digital conversion – Multiplex
Reexamination Certificate
2007-08-28
2007-08-28
Nguyen, Khai M. (Department: 2819)
Coded data generation or conversion
Analog to or from digital conversion
Multiplex
C341S143000, C341S145000, C331S00100A, C331S016000, C331S017000
Reexamination Certificate
active
11461408
ABSTRACT:
An exemplary PLL circuit includes a VCO responsive to a plurality of sub-varactor control signals. A digital loop filter for the PLL digitally generates a varactor control word, which is digitally expanded into a plurality of digital values, each of which is conveyed to a corresponding one of a plurality of DACs. A multiplexer is configured to respectively convey the DAC output signals to a group of sub-varactor control signals according to the varactor control word, and to drive remaining sub-varactor control signals to either the full-scale high value or the full-scale low value of the DAC outputs. Each of the DACs preferably includes a hybrid first order/second order sigma-delta modulator, and in certain embodiments, a NRZ-to-RZ coder circuit, and a linear filter circuit.
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Garlepp Bruno W.
Huang Yunteng
Welland David R.
Nguyen Khai M.
Silicon Laboratories Inc.
Zagorin O'Brien Graham LLP
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