-
公开(公告)号:US20020140507A1
公开(公告)日:2002-10-03
申请号:US10075161
申请日:2002-02-13
Applicant: STMicroelectronics S.r.I.
Inventor: Pietro Filoramo , Tiziano Chiarillo
IPC: H03F003/45
CPC classification number: H03G7/08
Abstract: A variable gain amplifier is described which comprises a first device to which a first control signal (Vc, Vc1) is applied so that the gain (Ai1, Ai) of an output signal (iout, io) of the first device (11, 22, Q45-Q48) with respect to a first input signal (in, i1, ir) is a function of the exponential type of the first control signal (Vc, Vc1). The amplifier comprises a feedback network (25, Q51-Q58) connected between an output terminal and an input terminal of the first device (22, Q45-Q48) so as to assure that the gain (Ai) in decibel of the first device (22, Q45-Q48) is a linear function of the first control signal (Vc1). (FIG. 2)
Abstract translation: 描述了一种可变增益放大器,其包括第一装置,第一装置施加第一控制信号(Vc,Vc1),使得第一装置(11,22)的输出信号(iout,io)的增益(Ai1,Ai) 相对于第一输入信号(in,i1,ir),Q45-Q48是第一控制信号(Vc,Vc1)的指数类型的函数。 放大器包括连接在第一装置(22,Q45-Q48)的输出端子和输入端子之间的反馈网络(25,Q51-Q58),以便确保第一装置的分贝的增益(Ai)( 22,Q45-Q48)是第一控制信号(Vc1)的线性函数。 (图2)