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    A circuit structure of the feedforward type with programmable zeroes, particularly for synthesizing time-continual filters
    14.
    发明公开
    A circuit structure of the feedforward type with programmable zeroes, particularly for synthesizing time-continual filters 有权
    向前电路结构具有可编程零用于合成连续时间滤波器

    公开(公告)号：EP1146639A2

    公开(公告)日：2001-10-17

    申请号：EP01100814.1

    申请日：2001-01-15

    Applicant: STMicroelectronics S.r.l.

    Inventor： Pisati, Valerio ,  Portaluri, Salvatore ,  Cazzaniga, Marco ,  Castello, Rinaldo

    IPC: H03H11/04

    CPC classification number: H03H11/0422

    Abstract: This invention relates to a circuit structure of the feedforward type with programmable zeroes, particularly for synthesizing time-continual filters.
    This structure comprises a pair of amplification cells (14,15) interconnected at at least one interconnection node (A) and connected between a first signal (Vin) input (IN) of a first cell (14) and an output terminal (U) of the second cell (15, each cell (14,15) comprising a pair of transistors (10,2;6,7) which have a conduction terminal in common and have the other conduction terminals coupled respectively to a first voltage reference (Vcc) through respective bias members (3,4;9,11). The structure further comprises a circuit leg (13) connecting a node (X) of the first cell (14) to the output terminal (U) and comprising a transistor (8) which has a control terminal connected to the node (X) of the first cell (14), a first conduction terminal connected to the output terminal (U), and a second conduction terminal coupled to a second voltage reference (GND) through a capacitor (Cc).
    Thus, a released "zero" can be introduced in the right semiplane of the pole-zero complex plane to improve the flattening of group gain.

    Abstract translation: 本发明涉及前馈型具有可编程零，特别是对于合成时间连续滤波器的电路结构。 这个结构包括至少一个互连节点（A）相互连接，并且连接的第一信号（Vin）输入第一小区的（IN）（14）之间和输出端子的一对扩增的细胞（14,15）（U） 所述第二小区（15，每个单元（14,15）包括一对晶体管（10.2，6.7），其具有共同的导通端子，并具有分别耦合到第一电压基准的其他导通端子（VCC ）通过respectivement偏置构件（3.4; 9.11）所述结构还包括一个电路腿（13）连接所述第一单元（14）到输出端（U）的一个节点（X）并包括一个晶体管（。 8），其具有连接到所述第一单元（14），连接到所述输出端（U）的第一导通端子，以及耦合到第二电压基准（GND）通过第二传导端的节点（X）的控制端子 电容器（CC），因此，释放“零”可以在零极点复杂的计划，以改善的右半平面上引入 组增益平坦化。

    Transconductance control circuit, particularly for continous-time circuits
    16.
    发明公开
    Transconductance control circuit, particularly for continous-time circuits 失效
    Schaltungen的Transkonduktanzsteuerschaltung insbesonderefürzeitkontinuierliche

    公开(公告)号：EP0957578A1

    公开(公告)日：1999-11-17

    申请号：EP98830296.4

    申请日：1998-05-15

    Applicant: STMicroelectronics S.r.l.

    Inventor： De Micheli, Marco ,  Portaluri, Salvatore ,  Bollati, Giacomino ,  Bruccoleri, Melchiorre

    IPC: H03H11/04 ,  H03F3/30

    CPC classification number: H03F3/3001 ,  H03H11/0472

    Abstract: A transconductance control circuit, particularly for a continuous-time filter, comprising a transconductor (4) across which a constant voltage is input; the transconductor is connected to a DAC (7) to set a reference current (I R ); a feedback loop (9, 10, 23, 11) is provided between the output of the transconductor (4) and its input; the particularity of the circuit is the fact that it further comprises means (20, 22, 24) for mirroring the reference current (I R ) set by the DAC (7) which are suitable to mirror the current both to the feedback loop and to at least one cell of a filter which is cascade-connected.

    Abstract translation: 一种跨导控制电路，特别是用于连续时间滤波器，包括跨导体（4），输入恒定电压; 跨导器连接到DAC（7）以设置参考电流（IR）; 在跨导体（4）的输出端与其输入端之间提供反馈回路（9,10,23,11） 电路的特殊性是其进一步包括用于镜像由DAC（7）设置的参考电流（IR）的装置（20,22,24），其适于将电流镜像到反馈回路并且到 串联连接的滤波器的至少一个单元。

    Feedforward structure with programmable zeros for synthesizing continuous-time filters, delay lines and the like
    18.
    发明公开
    Feedforward structure with programmable zeros for synthesizing continuous-time filters, delay lines and the like 失效
    前馈Strüktur可编程零用于合成连续时间滤波器，延迟线等

    公开(公告)号：EP0926814A1

    公开(公告)日：1999-06-30

    申请号：EP97830696.7

    申请日：1997-12-23

    Applicant: STMicroelectronics S.r.l.

    Inventor： Portaluri, Salvatore ,  Pisati, Valerio

    IPC: H03F1/00 ,  H03H11/04

    CPC classification number: H03H11/04

    Abstract: A feedforward structure with programmable zeros for synthesizing continuous-time filters, delay lines and the like, whose particularity is that it comprises a first cell and a second cell which are cascade-connected, each one of the first and second cells comprising a first pair (1, 2) of bipolar transistors in which the emitter terminals are connected to a current source (5), the first pair of transistors being connected to a second pair of transistors (6, 7), a current source (11) being connected to the emitter terminals of the second pair of transistors, a first high-impedance element (C) being connected between the first and second pairs of transistors, a second high-impedance element (C) being connected in output to the second pair of transistors, a fifth transistor (8) being connected between the collector terminal of a first transistor (1) of the first pair of transistors and a collector terminal of a second transistor (2) of the second pair of transistors, the base terminal of the fifth transistor (8) receiving a signal which is taken from the collector terminal of the first transistor of the first pair of transistors and is taken with a positive sign in the first cell and with a negative sign in the second cell, in order to determine a transfer function with a pair of singularities at the numerator, the second transistors (2, 7) of the first and second pairs being controlled respectively by current sources (4, 9) which have mutually different values.

    Abstract translation: 前馈结构，具有可编程零用于合成连续时间滤波器，延迟线等，谁的特殊性是做到了包括第一单元和哪些是级联连接的第二电池，其包括一第一对中的第一和第二小区中的每一个 （1，2），在该发射极端子连接到电流源（5），所述第一对晶体管中的另一个连接到第二对晶体管的双极晶体管（6,7），电流源（11）连接 到所述第二对晶体管的发射极端子，连接在第一和第二对晶体管之间的第一高阻抗元件（C），第二高阻抗元件（C）被连接在输出到所述第二对晶体管的 ，第五晶体管（8）连接的第一晶体管的集电极端子（1）之间的第一对晶体管和第二对晶体管的第二晶体管（2）的集电极端子，的基极端的 第五晶体管（8）接收信号的所有其从所述第一对晶体管的第一晶体管的集电极端子中取出，并在第一小区和与所述第二小区的负号被取正号，以 确定性矿由电流源分别被控制在与分子的一对奇点的，第一和第二对的第二晶体管（2,7）的传递函数（4,9），它们具有相互不同的值。

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