Squelch detecting circuit

Details Squelch detecting circuit Squelch detecting circuit

2007-05-15

2007-05-15

Vo, Nguyen T. (Department: 2618)

Telecommunications

Receiver or analog modulated signal frequency converter

Squelch

C455S296000, C375S351000

Reexamination Certificate

active

10935288

ABSTRACT:
The present invention provides a squelch detecting circuit capable of high-speed transfer while using a reduced number of high-speed operating operational amplifiers to reduce power consumption and the cost of parts. Input differential signals inputted to a differential amplification circuit are amplified and the amplified signal is outputted to a gain proportion circuit. The gain proportion circuit supplies a potential holding circuit with a potential proportional to the amplified signal. The potential holding circuit holds the potential supplied from the gain proportion circuit. A comparator circuit compares the potential held by the potential holding circuit with a reference potential to decide whether it is a squelch state or a non-squelch state and outputs the result as a detect signal.

REFERENCES:
patent: 4991227 (1991-02-01), Kehler, Jr.
patent: 6707314 (2004-03-01), Kasahara et al.
patent: 6859645 (2005-02-01), Yu
patent: 2002-344540 (2002-11-01), None
patent: 2002-344541 (2002-11-01), None

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