Patent ID: 7843266
Filing Date: 2010-11-30
Classification: H03F

Abstract:
1. An amplifier comprising: an operational amplifier comprising a first input terminal receiving a first input signal, a second input terminal receiving a second input signal, and an output terminal outputting an output signal; a first fuse box connected between the second input terminal and the output terminal of the operational amplifier; a second fuse box connected between the second input terminal and a first terminal for receiving a first voltage; and a diode connected between the second input terminal and a second terminal, wherein the first fuse box comprises: a plurality of first resistors connected in series between the second input terminal and the output terminal of the operational amplifier; and a plurality of first fuses which are cuttable and are connected in parallel with the first resistors, respectively, wherein the second fuse box comprises: a plurality of second resistors connected in series between the second input terminal and the first terminal; and a plurality of second fuses which are cuttable and are connected in parallel with the second resistors, respectively.