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    Integrated generator of a slow voltage ramp
    2.
    发明公开
    Integrated generator of a slow voltage ramp 有权
    Integrierter发电机einer langsamen Spannungsrampe

    公开(公告)号：EP1143617A1

    公开(公告)日：2001-10-10

    申请号：EP00830249.9

    申请日：2000-03-31

    Applicant: STMicroelectronics S.r.l.

    Inventor： Brambilla, Davide ,  Cleris, Mauro

    IPC: H03K4/06

    CPC classification number: H03K4/06 ,  H03K4/023

    Abstract: An integrated circuit for producing a small slope voltage ramp (V OUT ) is constituted by a circuit generating a periodic triangular current signal (I GM1 ), a circuit generating, at the beginning of each period of the triangular signal, a pulse (V) of a certain duration (τ) much smaller than the period (T) of the triangular signal, a loop input at a node (B) with the triangular current signal and producing on the output node the desired slow voltage ramp (V OUT ).
    The loop comprises a first hold circuit (C2, B UFFER2 ) coupled to the input node (B) by way of a first switch (SW2) controlled by the pulse (V), a transconductance operational amplifier (OTA1), whose inputs are respectively coupled to the input node (B) and to the output node (V OUT ), a second hold circuit (C1, B UFFER1 ) coupled to the output of the operational transconductance amplifier (OTA1) by way of a second switch (SW1) controlled in a complementary manner respect to the first switch (SW2), and a resistor (R) of a much smaller value than the ratio between the period (T) of the triangular signal and the capacitance of the storage capacitor (C2) of the first hold circuit, connected between the output of the second hold circuit and the input node (B).

    Abstract translation: 用于产生小斜坡电压斜坡（VOUT）的集成电路由产生周期性三角形电流信号（IGM1）的电路构成，在三角波信号的每个周期的开始处产生电路的脉冲（V） 在三角形信号的周期（T）小的特定持续时间（τ），在三角形电流信号的节点（B）输入的环路，并在输出节点产生所需的慢电压斜坡（VOUT）。 环路包括通过由脉冲（V）控制的第一开关（SW2）耦合到输入节点（B）的第一保持电路（C2，BUFFER2），跨导运算放大器（OTA1），其输入端分别耦合 到输入节点（B）和输出节点（VOUT），第二保持电路（C1，BUFFER1）通过第二开关（SW1）耦合到工作跨导放大器（OTA1）的输出端，控制互补 （SW2）的方式和比三角形信号的周期（T）和第一保持电路的存储电容器（C2）的电容之间的比值小得多的电阻器（R） 连接在第二保持电路的输出和输入节点（B）之间。

    Circuit for detecting distortion in an amplifier, in particular an audio amplifier
    4.
    发明公开
    Circuit for detecting distortion in an amplifier, in particular an audio amplifier 有权
    电路，用于检测所述失真放大器中的，特别是在音频放大器

    公开(公告)号：EP1164695A1

    公开(公告)日：2001-12-19

    申请号：EP00830419.8

    申请日：2000-06-13

    Applicant: STMicroelectronics S.r.l.

    Inventor： Brambilla, Davide ,  Nebuloni, Daniela ,  Cleris, Mauro

    IPC: H03F1/34 ,  H03F1/32

    CPC classification number: H03F1/3217 ,  H03F1/34

    Abstract: The amplifier (1, 2) has an input (2a); an output (2c) supplying an output signal (Vo), and a feedback network (5) connected between the input (2a) and the output (2c), and a distortion detection circuit (1). The feedback network (5; 55) includes a first and a second feedback element (6, 7) arranged in series and forming an intermediate node (10) supplying an intermediate signal (VB) in phase with the output signal (Vo) in absence of distortion, and in phase-opposition with the output signal in presence of distortion. The distortion detection circuit (1) includes a phase-comparating circuit (12, 15) which detects the phase of the output signal (Vo) and of the intermediate signal (VB), and generates a distortion-indicative signal (VCD), when the intermediate signal (VB) is in phase opposition with respect to the output signal (Vo).

    Abstract translation: 放大器（1,2）具有在输入端（2a）的; 到输出（2C）提供给连接在所述输入端（2a）的间输出信号（VO），和一个反馈网络（5）和输出（2C），和一失真检测电路（1）。 反馈网络（5; 55）包括第一和第二反馈元件（6,7）串联布置并且在中间节点（10）形成在相供给到中间信号（VB）与在不存在的输出信号（VO） 失真的，并且在相反对与失真的存在的输出信号。 失真检测电路（1）包括相comparating电路（12，15），其检测所述输出信号（VO）的相位和中间信号的（VB），及基因率失真指示信号（VCD），当 中间信号（VB）是在相对于所述输出信号（VO）反相。

    Method of preventing abrupt voltage changes at the outputs of a pair of amplifiers and control circuit for a pair of amplifiers self-configuring in a bridge configuration
    5.
    发明公开
    Method of preventing abrupt voltage changes at the outputs of a pair of amplifiers and control circuit for a pair of amplifiers self-configuring in a bridge configuration 有权
    一种用于防止突然的电压变化在放大器对和控制电路，用于自配置对放大器的输出在桥配置方法

    公开(公告)号：EP1548933A1

    公开(公告)日：2005-06-29

    申请号：EP03425816.0

    申请日：2003-12-23

    Applicant: STMicroelectronics S.r.l.

    Inventor： Chelli, Fabio ,  Brambilla, Davide

    IPC: H03F3/68 ,  H03F1/02

    CPC classification number: H03F3/45475 ,  H03F1/0277 ,  H03F1/32 ,  H03F3/3081 ,  H03F3/68 ,  H03F2200/03 ,  H03F2200/114 ,  H03F2203/45138

    Abstract: A method of preventing abrupt voltage changes at the outputs of a pair of amplifiers and a common mode control circuit of a pair of amplifiers that reduce EMI and increased distortions occur when the correlation between the signals that are fed to the four channels of the audio system diminishes has been found.
    This result is attained by properly generating for each amplifier a reference potential as a saturated replica of the respective differential input signal of the amplifier that saturates when the amplifier switches to a bridge configuration.
    This method is implemented in a common mode control circuit for a pair of amplifiers self-configuring in a bridge configuration for driving a first load and in a single-ended mode of operation of one of the amplifiers for driving the first load, in function of the level of a differential input signal, comprising for at least one of the pair of amplifiers a common mode feedback differential amplifier, a storage capacitor connected between any one of the two inputs of the feedback amplifier and a node at a reference potential, by providing the common mode control circuit of means for generating this reference potential.

    Abstract translation: 在一对放大器和一对放大器的共模控制电路的输出防止急剧的电压变化的方法确实减少了EMI和增加的扭曲时出现的信号之间的相关性也被馈送到音频系统的四个信道 减少被发现。 该结果是通过适当地产生用于每个放大器的基准电位作为放大器的respectivement差分输入信号的一个副本饱和并达到饱和当放大器切换到桥配置。 该方法在共模控制电路来实现的用于一对放大器-配置在自桥配置用于驱动第一负载并且在放大器中的一个的操作的单端模式的用于驱动第一负载 在差分输入信号的电平的功能，包括用于对放大器的共模反馈差分放大器，连接在反馈放大器的所述两个输入中的任何一个，并在参考节点之间的存储电容器中的至少一个 电位，通过用于产生该基准电位供给装置的共模控制电路。

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