Pulse or digital communications – Transmitters – Antinoise or distortion
Reexamination Certificate
2003-08-25
2009-06-23
Vo, Don N (Department: 2611)
Pulse or digital communications
Transmitters
Antinoise or distortion
Reexamination Certificate
active
07551685
ABSTRACT:
The invention is directed to a system for adaptively re-aligning a modulated output signal having an error component by generating a reference phase signal using a phase input signal; generating a sample phase signal from the output signal; comparing the reference and sample signals; and adaptively re-aligning any difference between the reference and sample signals to substantially reduce the error component. The invention may incorporate a sampling circuit for sampling the output signal to generate the sample signal; a digital phase locked loop for combining the phase input signal with a carrier wave to generate the reference signal and comparing them to generate a phase error signal; a reference filter for generating reference phase error information; a combining circuit for combining the phase error signal with the reference phase error information to generate a correction signal; and an adaptive gain control circuit for adaptively controlling gain in the correction signal to generate a final estimated error used to re-align the output signal with the phase input signal.
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McMahill, Daniel R., Sodini, Charles G., A 2.5 Mb/s GFSK 5.0-Mb/s 4-FSK Automatically Calibrated sigma-delta Frequency Synthesizer, IEEE Journal Of Solid-State Circuits, vol. 37, No. 1, Jan. 2002, pp. 18-26.
DiVincenzo Christine
Moy Carol
Yang Yongwen
M/A-Com Inc.
Vo Don N
LandOfFree
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