Ask demodulation device and wireless device using the same

Pulse or digital communications – Receivers – Angle modulation

Reexamination Certificate

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Details

C375S320000, C375S361000

Reexamination Certificate

active

07450666

ABSTRACT:
A delay section delays a detected signal by less than one bit time in the NRZ data. A subtraction section performs subtraction between a delayed signal and the detected signal, and outputs a resultant signal. A clock extraction section extracts, from crossing points of a subtracted signal, crossing points whose time interval is more than or equal to (Tb−α) and less than or equal to (Tb+β) (wherein 0<α≦Tb/8, 0<β≦Tb: Tb is one bit time in the NRZ data), and outputs a synchronous signal synchronized with the extracted crossing point. A clock recovery section synchronizes a clock signal with the phase of the synchronous signal, and outputs a data clock signal. A determination section determines the polarity of the subtracted signal outputted from the subtraction section in accordance with the data clock signal, and outputs the determination result as the NRZ data.

REFERENCES:
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patent: 4350973 (1982-09-01), Petryk, Jr.
patent: 4363002 (1982-12-01), Fuller
patent: 5164966 (1992-11-01), Hershberger
patent: 5946355 (1999-08-01), Baker
patent: 0 829 978 (1998-03-01), None
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patent: 2000-078211 (2000-03-01), None
patent: 2001-211214 (2001-08-01), None
patent: 2004-158960 (2004-06-01), None

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