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    15.
    发明专利
    未知

    公开(公告)号：DE69614248T2

    公开(公告)日：2001-11-15

    申请号：DE69614248

    申请日：1996-05-31

    Applicant: ST MICROELECTRONICS SRL ,  CONS RIC MICROELETTRONICA

    Inventor： PISATI VALERIO ,  ALINI ROBERTO ,  COSENTINO GAETANO ,  VAI GIANFRANCO

    IPC: H03F3/45 ,  H03F3/72 ,  H03H1/00

    Abstract: A BiCMOS Transconductor differential stage (10) for high frequency filters comprises an input circuit portion having signal inputs (IN+,IN-) and comprising a pair of MOS transistors (M1,M2) having their respective gate terminals (G1,G2) corresponding to the signal inputs as well as an output circuit portion having signal outputs (OUT-,OUT+) and comprising a pair of two-pole transistors (Q1,Q2) connected together with a common base in a circuit node (B) and inserted between inputs (IN+,IN-) and outputs (OUT-,OUT+) in cascode configuration. The stage (10) in accordance with the present invention calls for a switching device (3) associated with at least one of said added two-pole transistors (Q1,Q2) to change the connections between the parasite capacitors present in the transconductor stage. The switching device (3) also comprises at least one added two-pole transistor (Q1x, Q2x) connected in a removable manner in parallel with the corresponding two-pole cascode transistor (Q1,Q2). In a variant embodiment there are also provided respective added MOS transistors (M1x,M2x) connected in parallel with the MOS transistors (M1,M2) of the input portion to change the ratio W:L of each of the input transistors (M1,M2).

    20.
    发明专利
    未知

    公开(公告)号：DE69825060D1

    公开(公告)日：2004-08-19

    申请号：DE69825060

    申请日：1998-12-17

    Applicant: ST MICROELECTRONICS SRL

    Inventor： BOLLATI GIACOMINO ,  ALINI ROBERTO ,  OTTINI DANIELE ,  BRUCCOLERI MELCHIORRE

    IPC: H03H11/04

    Abstract: A low pass filter with programmable equalization comprising at least a biquadratic cell (BIQUAD) and a converter of the input voltage (Vin) in a current (iz), proportional to the derivative of the input voltage, that is injected on a node of the biquadratic cell (BIQUAD) in order to introduce two real and opposed zeroes in the transfer function of the filter, is composed of two structurally similar circuits, functionally connected in cascade, each circuit being composed of a biquadratic cell and an input stage having two outputs injecting through a first current output (A) said current (iz) on an input capacitor (C1) of the respective biquadratic cell, by a direct coupling in a first of said two circuits and in an inverted manner in the second of said two circuits; a second voltage output (B) being coupled to an input of the respective biquadratic cell.

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