Carrier detecting circuit and infrared communication device...

Details Carrier detecting circuit and infrared communication device... Carrier detecting circuit and infrared communication device...

2007-11-20

2007-11-20

Le, Lana (Department: 2618)

Telecommunications

Receiver or analog modulated signal frequency converter

Local control of receiver operation

C455S214000, C455S263000, C375S376000

Reexamination Certificate

active

10868810

ABSTRACT:
A carrier detecting circuit which generates a carrier detection level by integral action based on a reception signal and detects using the carrier detection level whether a carrier exists is disclosed and includes an integration capacitor that is charged and discharged using a difference current between a current charged from a charging circuit and a current discharged to a discharging circuit, where the charging circuit and the discharging circuit are provided in an integrator which performs the integral action.

REFERENCES:
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patent: 5917349 (1999-06-01), Nguyen
patent: 6677732 (2004-01-01), Inoue et al.
patent: 2002/0098818 (2002-07-01), Yokogawa et al.
patent: 1-212028 (1989-08-01), None
patent: 3-262153 (1991-11-01), None
patent: 10-341585 (1998-12-01), None

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