公开(公告)号：EP2110947A1

公开(公告)日：2009-10-21

申请号：EP08305110.2

申请日：2008-04-18

Applicant: ST MICROELECTRONICS S.A.

Inventor： Touzard, Olivier ,  Tournier, Véronique

IPC: H03G1/00

CPC classification number: H03G1/0023 ,  H03F3/19 ,  H03F3/45089 ,  H03F2200/294 ,  H03F2203/45392

Abstract: The invention concerns a variable gain amplifier having an input node (302), a variable current source (304) including a control input coupled to the input node, first and second branches (308, 309) coupled in parallel between a first supply terminal and the variable current source, the first and second branches defining a differential pair arranged to be controlled by first and second differential gain signals (V gainN , V gainP ) and comprising first and second output terminals, one of the output terminals comprising an output node of the variable gain amplifier; and a potential divider (322, 324) having a middle node (326) coupled to the first and second output terminals, wherein the middle node is also coupled to the input node by a capacitor (328).

Abstract translation: 本发明涉及一种可变增益放大器，其具有输入节点（302），包括耦合到输入节点的控制输入的可变电流源（304），第一和第二分支（308,309）并联耦合在第一供电端子和 所述可变电流源，所述第一和第二分支限定被布置为由第一和第二差分增益信号（V gainN，V gainP）控制并且包括第一和第二输出端子的差分对，所述输出端中的一个包括输出节点 可变增益放大器; 和具有耦合到第一和第二输出端的中间节点（326）的分压器（322,324），其中中间节点还通过电容器耦合到输入节点（328）。