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1. 发明授权

US6072359A Current generator circuit having a wide frequency response 失效
标题翻译：电流发生器电路具有较宽的频率响应
公开(公告)号：US6072359A
公开(公告)日：2000-06-06
申请号：US108081
申请日：1998-06-30
申请人： Davide Brambilla , Daniela Nebuloni , Giorgio Rossi , Sergio Lecce
发明人： Davide Brambilla , Daniela Nebuloni , Giorgio Rossi , Sergio Lecce
IPC分类号： G05F3/26 , H03F3/345 , H03F3/343
CPC分类号： H03F3/345 , G05F3/267
摘要： A current generator circuit with controllable frequency response has at least one current mirror formed of MOS transistors, being powered through a terminal held at a constant voltage, having an input leg through which a reference current (I1) is driven by a first current generator (G1), and having an output leg for generating, on an output terminal (OUT) of the mirror, a mirrored current (I.sub.out) which is proportional to the reference current (I1). The input leg includes at least a first transistor (M1) which is diode-connected and has a control terminal (Ga1) coupled to a corresponding terminal (Ga2) of a second transistor (M2) included in the output leg. In accordance with the invention, the mirror circuit also has an impedance matching circuit connected across the control terminals (Ga1 and Ga2) of the first and second transistors and configured to hold the same voltage value at both terminals (Ga1 and Ga2). The impedance matching circuit has an adjustable output impedance, specifically lower in value than the value to be had without this circuit. It functions to regulate the impedance on the control node (Ga2) of the second transistor (M2). The invention is equally applicable to N-channel and P-channel MOS transistors. Advantageously, the reference current can be varied by an external signal which is a function of the output signal, to provide feedback regulating features.
摘要翻译：具有可控频率响应的电流发生器电路具有由MOS晶体管形成的至少一个电流镜，其通过保持在恒定电压的端子供电，具有输入支路，参考电流（I1）由第一电流发生器 G1），并且具有用于在镜的输出端（OUT）上产生与参考电流（I1）成比例的镜像电流（Iout）的输出支路。输入支路至少包括二极管连接的第一晶体管（M1），并且具有耦合到包括在输出支路中的第二晶体管（M2）的相应端子（Ga2）的控制端子（Ga1）。根据本发明，镜电路还具有连接在第一和第二晶体管的控制端（Ga1和Ga2）两端的阻抗匹配电路，并被配置为在两端（Ga1和Ga2）处保持相同的电压值。阻抗匹配电路具有可调节的输出阻抗，具体值低于没有该电路的值。它用于调节第二晶体管（M2）的控制节点（Ga2）上的阻抗。本发明同样适用于N沟道和P沟道MOS晶体管。有利地，参考电流可以通过作为输出信号的函数的外部信号来改变，以提供反馈调节特征。

2. 发明授权

US5874852A Current generator circuit having a wide frequency response 失效
标题翻译：电流发生器电路具有较宽的频率响应
公开(公告)号：US5874852A
公开(公告)日：1999-02-23
申请号：US706068
申请日：1996-08-30
申请人： Davide Brambilla , Daniela Nebuloni , Giorgio Rossi , Sergio Lecce
发明人： Davide Brambilla , Daniela Nebuloni , Giorgio Rossi , Sergio Lecce
IPC分类号： G05F3/26 , H03F3/345 , H03F3/343
CPC分类号： H03F3/345 , G05F3/267
摘要： A current generator circuit with controllable frequency response has at least one current mirror formed of MOS transistors, being powered through a terminal held at a constant voltage, having an input leg through which a reference current (I1) is driven by a first current generator (G1), and having an output leg for generating, on an output terminal (OUT) of the mirror, a mirrored current (I.sub.out) which is proportional to the reference current (I1). The input leg includes at least a first transistor (M1) which is diode-connected and has a control terminal (Ga1) coupled to a corresponding terminal (Ga2) of a second transistor (M2) included in the output leg by an impedance matching circuit configured to hold the same voltage value at both terminals (Ga1 and Ga2). The impedance matching circuit has an adjustable output impedance, specifically lower in value than the value to be had without this circuit. It functions to regulate the impedance on the control node (Ga2) of the second transistor (M2). The invention is equally applicable to N-channel and P-channel MOS transistors. Advantageously, the reference current can be varied by an external signal which is a function of the output signal, to provide feedback regulating features.
摘要翻译：具有可控频率响应的电流发生器电路具有由MOS晶体管形成的至少一个电流镜，其通过保持在恒定电压的端子供电，具有输入支路，参考电流（I1）由第一电流发生器 G1），并且具有用于在镜的输出端（OUT）上产生与参考电流（I1）成比例的镜像电流（Iout）的输出支路。输入支路至少包括二极管连接的第一晶体管（M1），并且具有通过阻抗匹配电路耦合到包括在输出支路中的第二晶体管（M2）的对应端子（Ga2）的控制端子（Ga1）被配置为在两个端子（Ga1和Ga2）处保持相同的电压值。阻抗匹配电路具有可调节的输出阻抗，具体值低于没有该电路的值。它用于调节第二晶体管（M2）的控制节点（Ga2）上的阻抗。本发明同样适用于N沟道和P沟道MOS晶体管。有利地，参考电流可以通过作为输出信号的函数的外部信号来改变，以提供反馈调节特征。

3. 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。

4. 发明申请

US20050174705A1 Method for preventing cross-conductions and interactions between supply lines of a device and a circuit for limiting the voltage difference between two regulated output voltages 审中-公开
标题翻译：用于防止器件的电源线与用于限制两个稳定输出电压之间的电压差的电路的交叉传导和相互作用的方法
公开(公告)号：US20050174705A1
公开(公告)日：2005-08-11
申请号：US11056407
申请日：2005-02-11
申请人： Davide Brambilla , Daniela Nebuloni
发明人： Davide Brambilla , Daniela Nebuloni
IPC分类号： G05F1/56 , H02H7/00
CPC分类号： G05F1/56
摘要： In a device that includes a pair of closed-loop voltage regulators each including an input transconductance stage receiving a reference voltage and a feedback voltage, an intermediate transresistance stage, an output buffer operatively in cascade for generating on an output node the regulated output voltage and negative feedback means for providing the feedback voltage to the input stage, the method includes a circuit that limits the difference between two output regulated voltages. The limiting circuit includes a differential transconductance amplifier input with voltages proportional to the output voltages of the regulators or obtained by adding an offset voltage to the output voltage of the regulators for injecting in, or draining from, an input node of the intermediate stage of one of the regulators, a current as a function of the relative unbalance of the differential transconductance amplifier.
摘要翻译：在包括一对闭合电压调节器的装置中，每一个包括接收参考电压和反馈电压的输入跨导级，中间跨阻级，可级联的输出缓冲器，用于在输出节点上产生调节的输出电压，以及负反馈装置用于向输入级提供反馈电压，该方法包括限制两个输出调节电压之间的差的电路。限制电路包括差分跨导放大器输入，其具有与调节器的输出电压成比例的电压，或者通过将偏移电压加到调节器的输出电压上，以将其输入或从其中间级的输入节点排出的调节器，作为差分跨导放大器的相对不平衡的函数的电流。

5. 发明授权

US5363062A Audio amplifier on-off control circuit 失效
标题翻译：音频放大器开关控制电路
公开(公告)号：US5363062A
公开(公告)日：1994-11-08
申请号：US065633
申请日：1993-05-21
申请人： Daniela Nebuloni , Andrea Fassina
发明人： Daniela Nebuloni , Andrea Fassina
IPC分类号： H03F1/00 , H03F1/30 , H03G1/04 , H03G3/34 , H03F1/26
CPC分类号： H03G3/348 , H03F1/305
摘要： A circuit for controlling on-off switching of an audio amplifier in such a manner as to prevent sharp uncontrolled variations of the output during switching from resulting in undesired noise (popping) on the loudspeakers. For so doing, the circuit provides for generating a controlled positive potential at the negative input in relation to the positive input of the amplifier when this is switched on or off. More specifically, when switching on, the potential difference is maintained pending switching of all the sources on the amplifier, after which, it is gradually eliminated for enabling the output to reach the steady-state value slowly and in controlled manner; whereas, when switching off, the potential difference is generated gradually for enabling the output of the amplifier to be grounded slowly prior to turning off the amplifier itself.
摘要翻译：一种用于控制音频放大器的开关切换的电路，以防止在切换期间输出的尖锐的不受控制的变化，从而导致扬声器上的不期望的噪声（爆裂）。为此，该电路用于在负极输入端相对于放大器的正输入端产生受控正电位，当该电压被接通或断开时。更具体地说，当接通时，在放大器中的所有源的切换之前保持电位差，之后逐渐消除以使输出缓慢地并以受控的方式达到稳态值; 而当关断时，电位差逐渐产生，以使放大器的输出在放大器自身关断之前缓慢接地。

6. 发明授权

US5068620A Circuit for securing output distortion, in particular of final stages of audio devices 失效
标题翻译：用于保护输出失真的电路，特别是音频设备的最后阶段
公开(公告)号：US5068620A
公开(公告)日：1991-11-26
申请号：US607949
申请日：1990-11-01
申请人： Edoardo Botti , Fabrizio Stefani , Daniela Nebuloni
发明人： Edoardo Botti , Fabrizio Stefani , Daniela Nebuloni
IPC分类号： G01R29/00 , G01R31/00 , H03F1/32 , H03F1/34
CPC分类号： H03F1/34 , H03F1/3217
摘要： A circuit for sensing the output distortion of amplifier stages of the type which has a first input which receives a voltage signal to be amplified, a second input connected to a feedback network and an output which generates an amplified output signal. The circuit comprises at least one comparator, which receives in input a first signal which is correlated to the voltage signal and a second signal which is correlated to the output signal of the amplifier stage, and is enabled so as to generate a distortion signal in output when the second signal exceeds the first one in terms of absolute value, i.e. in the presence of distortion.

7. 发明授权

US5703528A Audio amplifier turn-off control circuit 失效
标题翻译：音频放大器关断控制电路
公开(公告)号：US5703528A
公开(公告)日：1997-12-30
申请号：US337108
申请日：1994-11-10
申请人： Daniela Nebuloni , Andrea Fassina
发明人： Daniela Nebuloni , Andrea Fassina
IPC分类号： H03F1/00 , H03F1/30 , H03G3/34 , H03F1/14 , H03B21/00 , H04B15/00
CPC分类号： H03F1/305 , H03G3/348
摘要： A circuit comprising a transistor which, when supply is turned off, locks the output of the audio amplifier to the supply line, the potential of which is reduced gradually by a filter capacitor, so that the output voltage follows the supply voltage with the same slope, and is so controlled by the filter capacitor, thus eliminating undesired noise ("popping") at the output caused by electric transients in the audio amplifier.
摘要翻译：一种电路，包括晶体管，当电源关闭时，将音频放大器的输出锁定到电源线，其电位由滤波电容逐渐减小，使得输出电压以相同的斜率跟随电源电压，并被滤波电容器控制，从而消除由音频放大器中的电瞬变引起的输出处的不期望的噪声（“弹出”）。

8. 发明授权

US5420535A Audio amplifier turn-off control circuit 失效
标题翻译：音频放大器关断控制电路
公开(公告)号：US5420535A
公开(公告)日：1995-05-30
申请号：US65672
申请日：1993-05-21
申请人： Daniela Nebuloni , Andrea Fassina
发明人： Daniela Nebuloni , Andrea Fassina
IPC分类号： H03F1/00 , H03F1/30 , H03G3/34 , H03F1/14
CPC分类号： H03F1/305 , H03G3/348
摘要： A circuit comprising a transistor which, when supply is turned off, locks the output of the audio amplifier to the supply line, the potential of which is reduced gradually by a filter capacitor, so that the output voltage follows the supply voltage with the same slope, and is so controlled by the filter capacitor, thus eliminating undesired noise ("popping") at the output caused by electric transients in the audio amplifier.
摘要翻译：一种电路，包括晶体管，当电源关闭时，将音频放大器的输出锁定到电源线，其电位由滤波电容逐渐减小，使得输出电压以相同的斜率跟随电源电压，并被滤波电容器控制，从而消除由音频放大器中的电瞬变引起的输出处的不期望的噪声（“弹出”）。

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