Oscillators – Automatic frequency stabilization using a phase or frequency... – Afc with logic elements
Reexamination Certificate
2007-09-07
2009-10-13
Pascal, Robert (Department: 2817)
Oscillators
Automatic frequency stabilization using a phase or frequency...
Afc with logic elements
C341S143000, C327S156000
Reexamination Certificate
active
07602252
ABSTRACT:
There is provided a sigma delta modulator that outputs an output signal obtained by performing sigma delta modulation on an input signal, including: a plurality of accumulators that are serially connected; and an output signal generating section that generates the output signal on the basis of comparison result signals respectively output from the accumulators, in which each of the accumulators integrates values of signals being input and when an integration value is not less than a reference value, outputs the comparison result signal with a predetermined value and subtracts the value of the comparison result signal from the integration value, the value of the input signal is input into a first-stage accumulator, the integration value of the preceding-stage accumulator is input into the other accumulator, and at least one of the accumulators includes a low-pass filter that removes a predetermined high-frequency component in a waveform of the integration value.
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patent: 5038117 (1991-08-01), Miller
patent: 6570452 (2003-05-01), Sridharan
patent: 6844836 (2005-01-01), Lee
patent: 6920182 (2005-07-01), Bolton, Jr.
patent: 2001-298363 (2001-10-01), None
patent: 2004-260791 (2004-09-01), None
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patent: WO 03-028218 (2003-04-01), None
Advantest Corporation
Jianq Chyun IP Office
Johnson Ryan J.
Pascal Robert
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