OPERATIONAL TRANSCONDUCTANCE AMPLIFIER HAVING TWO AMPLIFICATION STAGES.

摘要

The present invention relates to an operational amplifier (100), comprising: a first amplification stage (101) having an input terminal (INM, INP) to receive a signal to be amplified, and a first output terminal (T1, T2); a second amplification stage (102) having a first input terminal (Ql, Q2) connected to said first output terminal, and an output terminal (OUT1, OUT2) to provide the amplified signal. Such first and second amplification stages define, between said input terminal (INM, INP) and said output terminal (OUT1, OUT2), a signal transfer function comprising a first (?p1) and a second (?p2) poles. The amplifier is characterized in that it comprises a decoupling stage (103) having a further input terminal connected to said first stage input terminal (INM, INP), and a further output terminal connected to the second stage output terminal (OUT1, OUT2). Such decoupling stage (103) is so arranged as to introduce at least one zero (?z) in the operational amplifier transfer function.