Operational amplifier for selecting an input signal and the operational amplifier be used, the reinforcing device for the verification method

摘要

Current feedback operational amplifier - with a plurality of input members and to an output member, wherein each of the plurality of input parts of a first input terminal, a second input terminal and a first output terminal; the of the first input terminal input signals from a buffer amplifier is increased and at the second input terminal; and current in an amount of the first output terminal is supplied which corresponds to the current which flows to the second input terminal;the output part a third input terminal and a second output terminal; by adding of the current of signals of all input members signals obtained are fed to the third input terminal; and the signals supplied to the third input terminal is converted into voltage signals, amplified and fed as output signal of the second output terminal; andand in response to a first external signal of one of the input parts is activated and the other input stages are switched to the ineffective, wherein the impedance of the first input connection, of the second input connection and of the first output terminal of said high impedance input stages connected to the ineffective..