INTEGRATED AMPLIFIER DEVICE

摘要

PROBLEM TO BE SOLVED: To provide an amplifier with high high-frequency interference resistance and two amplifier stages capable of being alternately inactivated. SOLUTION: The amplifier is provided with one switch stage SW other than two amplifier stages V1, V2 and one amplifier stage V2 is connected with a reference potential connecting part GND at a reference potential on the input side with low ohmic characteristics via the switch stage SW to inactivate the amplifier stage V2. In this case, the other amplifier stage V2 is connected with the reference potential connecting part GND with the lower ohmic characteristics when input current U1 to be generated in an amplifier input terminal IN1 of the amplifier stage V1 is provided with a DC operating point to activate the amplifier stage V1.