Method and apparatus for amplifying a signal and test device using same

申请公布号：US7928721(B2)

申请号：US20070881699

申请日期：2007.07.26

申请公布日期：2011.04.19

申请人：

FLUKE CORPORATION

发明人：YAO HONG

分类号：G01R1/30

主分类号：G01R1/30

摘要：An amplifier circuit is used in a multimeter to amplify signals applied between a pair of test terminals. A voltage applied to one of the test terminals is amplified by a first operational amplifier configured as a voltage follower. An output of the first operational amplifier is applied to an inverting input of a second operational amplifier configured as an integrator. An output of the second operational amplifier is connected to the other of the test terminals. A voltage generated at the output of the second operational amplifier provides an indication of the magnitude and polarity of the voltage applied to the first and second test terminals.

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