Amplifier and control method thereof

申请公布号：US2008012718(A1)

申请号：US20070812551

申请日期：2007.06.20

申请公布日期：2008.01.17

申请人：

FUJITSU LIMITED

发明人：AOKI KOUJU;WATAI TAKAHIRO;SAKIMA HIROYUKI;MIZUTANI MASAYA;OKAJIMA TAKUYA

分类号：G08B21/00

主分类号：G08B21/00

摘要：An amplifier 1 is arranged to amplify a sense signal from a sensor with low current consumption while maintaining sufficient sensitivity. The amplifier 1 comprises a detection circuit 2 which detects a signal level of the sense signal and outputs an alarm signal when the sense signal is in a first signal level range R 1, and a variable gain amplifier 3 which, based on a detection result of the detection circuit 2, stops an amplifying operation when the sense signal is in the first signal level range R 1, performs the amplifying operation at a first gain G 1 when the sense signal is in a second signal level range R 2, or performs the amplifying operation at a second gain G 2 larger than the first gain G 1 when the sense signal is in a third signal level range R 3 defined between the first and second signal level ranges.

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