Coded data generation or conversion – Analog to or from digital conversion – Analog to digital conversion
Reexamination Certificate
2007-07-24
2007-07-24
Williams, Howard L. (Department: 2819)
Coded data generation or conversion
Analog to or from digital conversion
Analog to digital conversion
C369S059200, C375S340000
Reexamination Certificate
active
10558712
ABSTRACT:
Disclosed is a bit-detection arrangement able to convert an analog signal (AS) having an amplitude into a digital signal (DS) representing a bit sequence from which the analog signal (AS) is derived. The bit-detection arrangement has a phase detector which detect the phase difference between a quantized analog signal and a clock signal C2. The phase difference is sampled by an AD converter. The AD converter can sample at a relatively slow rate as the phase difference is a low frequency signal. The sampled phase difference is fed to a digital PLL which outputs a phase signal PHI. The phase signal and the quantized analog signal are used to recreate the digital signal (DS). The current invention is characterized in that the bit decision unit further comprises—at least one additional sample and hold unit SH2able to sample the output signal S1, using a clock signal CSH2and wherein the frequency of the clock signal CSH2is equal to the frequency of clock signal CSH1and the phase of clock signal CSH2is substantially different from the phase of clock signal CSH1, and an output unit for outputting samples of either the sample and hold units SH1or SH2, wherein the samples of the sample and hold unit SH1are outputted when the phase signal PH1indicates that the phase difference ΔP1is in a first region and the samples of the additional sample and hold unit SH2are outputted when the phase signal PH1indicates that the phase difference ΔP1is in a second region. This has the advantage that the change of bit errors occurring in the presence of phase jitter is reduced.
REFERENCES:
patent: 5663945 (1997-09-01), Hayashi et al.
patent: 5812508 (1998-09-01), Moon
patent: 2003/0117925 (2003-06-01), Tonami
patent: 2005/0018776 (2005-01-01), Kahlman
patent: 0 342 736 (1989-11-01), None
Immink Albert Hendrik Jan
Kahlman Josephus Arnoldus Henricus Maria
Rutten Albertus Johannes Antonius
Van Beurden Nicolaas Johannes Hendricus Maria
Koninklijke Philips Electronics , N.V.
Marion Michael E.
Williams Howard L.
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