ASK demodulator, communication module, communication device,...

Details ASK demodulator, communication module, communication device,... ASK demodulator, communication module, communication device,...

2011-01-25

2011-01-25

Mis, David (Department: 2817)

Demodulators

Pulse or interrupted continuous wave demodulator

C375S353000

Reexamination Certificate

active

07876150

ABSTRACT:
According to one embodiment, an ASK demodulator includes a rectifier, a first low-pass filter, a second low-pass filter, a comparator, and a threshold controller. The rectifier rectifies an ASK signal. The first low-pass filter outputs a signal corresponding to an envelope curve output from the rectifier. The second low-pass filter outputs an integrated signal of the signal output from the first low-pass filter. The comparator detects an output logic in accordance with comparison between the signal output from the first low-pass filter and a threshold obtained by adding a predetermined hysteresis width to the integrated signal output from the second low-pass filter. The threshold controller controls the threshold by setting the predetermined hysteresis width based on a direct current offset voltage caused by element dispersions of the comparator.

REFERENCES:
patent: 7054389 (2006-05-01), Yokogawa et al.
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patent: 2000-174830 (2000-06-01), None
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patent: 2004-056458 (2004-02-01), None
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patent: 2004-304515 (2004-10-01), None
patent: 2006-295319 (2006-10-01), None

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