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1. 发明授权

US06429741B2 Circuit for detecting distortion in an amplifier, in particular an audio amplifier 有权
标题翻译：用于检测放大器，特别是音频放大器中的失真的电路
公开(公告)号：US06429741B2
公开(公告)日：2002-08-06
申请号：US09880638
申请日：2001-06-12
申请人： Davide Brambilla , Daniela Nebuloni , Mauro Cleris
发明人： Davide Brambilla , Daniela Nebuloni , Mauro Cleris
IPC分类号： H03F126
CPC分类号： H03F1/3217 , H03F1/34
摘要： An amplifier having an input; an output supplying an output signal, and a feedback network connected between the input and the output, and a distortion detection circuit. The feedback network includes a first and a second feedback element arranged in series and forming an intermediate node supplying an intermediate signal in phase with the output signal in absence of distortion, and in phase-opposition with the output signal in presence of distortion. The distortion detection circuit includes a phase-comparating circuit which detects the phase of the output signal and of the intermediate signal, and generates a distortion-indicative signal, when the intermediate signal is in phase opposition with respect to the output signal.
摘要翻译：具有输入的放大器; 提供输出信号的输出和连接在输入和输出之间的反馈网络，以及失真检测电路。反馈网络包括串联布置的第一和第二反馈元件，并且形成中间节点，在没有失真的情况下提供与输出信号同相的中间信号，并且在存在失真的情况下与输出信号相反。失真检测电路包括相位比较电路，当相对于输出信号相位相反时，相位比较电路检测输出信号和中间信号的相位，并产生失真指示信号。

2. 发明授权

US06384645B2 Integrated generator of a slow voltage ramp 有权
标题翻译：集成发电机的缓慢电压斜坡
公开(公告)号：US06384645B2
公开(公告)日：2002-05-07
申请号：US09824534
申请日：2001-04-02
申请人： Davide Brambilla , Mauro Cleris
发明人： Davide Brambilla , Mauro Cleris
IPC分类号： H03K406
CPC分类号： H03K4/06 , H03K4/023
摘要： An integrated circuit for producing a small slope voltage ramp includes a circuit for generating a periodic triangular current signal, and a circuit for generating, at the beginning of each period of the triangular signal, a pulse of a certain duration which is much smaller than the period of the triangular signal. A control loop is input at a node with the triangular current signal and produces the desired slow voltage ramp on the output node. The control loop includes a first hold circuit coupled to the input node via a first switch controlled by the pulse, and a transconductance operational amplifier, whose inputs are respectively coupled to the input node and to the output node. Also, the control loop includes a second hold circuit coupled to the output of the operational transconductance amplifier via a second switch controlled in a complementary manner with respect to the first switch. A resistor of a much smaller value than the ratio between the period of the triangular signal and the capacitance of the storage capacitor of the first hold circuit is connected between the output of the second hold circuit and the input node.
摘要翻译：用于产生小斜坡电压斜坡的集成电路包括用于产生周期性三角形电流信号的电路，以及用于在三角形信号的每个周期的开始处产生一定长度的脉冲，该脉冲远小于三角形信号的周期。在具有三角形电流信号的节点处输入控制回路，并在输出节点上产生所需的慢速电压斜坡。控制回路包括通过由脉冲控制的第一开关耦合到输入节点的第一保持电路和跨导运算放大器，其输入分别耦合到输入节点和输出节点。而且，控制回路包括第二保持电路，该第二保持电路通过相对于第一开关以互补方式控制的第二开关耦合到运算跨导放大器的输出端。在第二保持电路的输出和输入节点之间连接有比三角形信号的周期和第一保持电路的存储电容的电容之间的比值小得多的电阻。

3. 发明授权

US07113606B2 Adjustable harmonic distortion detector and method for using the same 有权
公开(公告)号：US07113606B2
公开(公告)日：2006-09-26
申请号：US09943414
申请日：2001-08-30
申请人： Edoardo Botti , Mauro Cleris , Antonio Grosso
发明人： Edoardo Botti , Mauro Cleris , Antonio Grosso
IPC分类号： H04B15/00 , H03G5/00 , H03G3/00 , H03F1/26 , G01N15/12 , H03L5/00 , H03B1/00
CPC分类号： G01R23/20
摘要： There is provided an adjustable harmonic distortion detector that includes a clock signal source, means for the detection of a first period of evaluation, and means for the detection of a second period of evaluation. The detector has the characteristic that a first block memorizes a number equal to the clock pulses present in the first period of evaluation, a multiplier block performs a multiplication between the number stored in the first block and a multiplicative factor during the second period of evaluation, and a second block memorizes the outcome. The second block is adapted to generate an output signal when the outcome in the second block is equal to zero.

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