公开(公告)号：US09941850B1

公开(公告)日：2018-04-10

申请号：US15284150

申请日：2016-10-03

Applicant: STMICROELECTRONICS S.R.L.

Inventor： Luca Giuffredi ,  Andrea Boni ,  Marco Ronchi

IPC: H03F3/45 ,  H03F1/26 ,  H03F1/34

CPC classification number: H03F3/45632 ,  H03F1/14 ,  H03F1/26 ,  H03F3/45188 ,  H03F3/45659 ,  H03F2200/153 ,  H03F2200/555

Abstract: A fully differential operational amplifier is provided. The amplifier has input nodes and includes a differential input stage for receiving input signals over the input nodes and providing output signals on first and second intermediary nodes. The amplifier includes a fully differential amplification stage having positive and negative inputs coupled to the first and second intermediary nodes, respectively. The amplifier includes a first compensation transistor having conduction terminals coupled to the first intermediary node and a first node, and a control terminal coupled to a negative output of the fully differential amplification stage. The amplifier includes a second compensation transistor having conduction terminals coupled to the second intermediary node and a second node, and a control terminal coupled to a positive output of the fully differential amplification stage. The amplifier includes positive and negative output stages for providing amplifier outputs and feeding the outputs back to the amplifier.