公开(公告)号：US4935703A

公开(公告)日：1990-06-19

申请号：US359848

申请日：1989-05-31

申请人： Vanni Poletto

发明人： Vanni Poletto

IPC分类号： H03F1/02 ,  H03F3/30

CPC分类号： H03F3/3069 ,  H03F1/0261 ,  H03F3/3071 ,  H03F2203/30121 ,  H03F2203/30144 ,  H03F2203/45168

摘要： A bias current source for the output stage of an operational amplifier is controllable. The bias current generator senses the voltage differential on the differential operational amplifier inputs. When an input differential voltage is sensed which generates a rising output signal, additional bias current is provided to the output stage. When the output voltage is constant or falling, the bias current to the output stage is decreased.

公开(公告)号：US5568090A

公开(公告)日：1996-10-22

申请号：US506529

申请日：1995-07-25

申请人： Joseph R. Pierret

发明人： Joseph R. Pierret

IPC分类号： H03F1/02 ,  H03F3/30 ,  H03F3/45

CPC分类号： H03F3/3069 ,  H03F1/0261 ,  H03F3/3071 ,  H03F2203/30087 ,  H03F2203/30121 ,  H03F2203/45168

摘要： An amplifier circuit is disclosed having circuitry that senses an electrical current at the output node while dynamically adjusting a bias current for an output circuit of the amplifier circuit. The bias current controls the amount of electrical current that the output circuit sinks or sources at the output node.

摘要翻译： 公开了一种放大器电路，其具有检测输出节点处的电流的电路，同时动态地调整放大器电路的输出电路的偏置电流。 偏置电流控制输出电路在输出节点处吸收或输出的电流量。

公开(公告)号：US5471171A

公开(公告)日：1995-11-28

申请号：US45537

申请日：1993-04-09

申请人： Tetsuro Itakura ,  Hiroshi Tanimoto

发明人： Tetsuro Itakura ,  Hiroshi Tanimoto

IPC分类号： H03F1/02 ,  H03F3/45

CPC分类号： H03F3/3022 ,  H03F1/0244 ,  H03F1/0261 ,  H03F3/301 ,  H03F2203/30048 ,  H03F2203/30121 ,  H03F2203/45008 ,  H03F2203/45014 ,  H03F2203/45466

摘要： An amplifier device capable of performing an efficient amplifying operation with a low power consumption includes an amplifier circuit at least having an input amplifier stage which amplifies a level change of an input signal to output an amplified current, and an output stage which outputs the amplified current as a driving output to a capacitive load; a primary bias circuit for ordinarily supplying a constant and main bias current to the amplifier circuit; a determination element for determining a change condition of the level change of the input signal, which is supplied from the input amplifier stage, so as to generate a control signal corresponding to said change condition; and a driving capability increase element as a secondary bias circuit for increasing a bias current in order to increase the driving output supplied to the capacitive load when the control signal is input.

摘要翻译： 能够以低功耗进行高效放大运算的放大器装置，具有至少具有放大输入信号的电平变化以输出放大电流的输入放大级的放大电路，以及输出放大电流的输出级 作为电容性负载的驱动输出; 用于通常向放大器电路提供恒定和主偏置电流的初级偏置电路; 确定元件，用于确定从输入放大器级提供的输入信号的电平变化的变化状态，以产生对应于所述变化条件的控制信号; 以及作为用于增加偏置电流的次级偏置电路的驱动能力增加元件，以便当输入控制信号时增加提供给电容性负载的驱动输出。

公开(公告)号：US5399992A

公开(公告)日：1995-03-21

申请号：US152887

申请日：1993-11-16

申请人： Tetsuro Itakura ,  Hiroshi Tanimoto

发明人： Tetsuro Itakura ,  Hiroshi Tanimoto

IPC分类号： H03F3/45 ,  H03F1/02 ,  H03K17/04 ,  H03K17/687 ,  H03K19/0175 ,  H03K19/094

CPC分类号： H03F1/0244 ,  H03F1/0261 ,  H03F3/301 ,  H03F3/3022 ,  H03F2203/30048 ,  H03F2203/30121 ,  H03F2203/45008 ,  H03F2203/45014 ,  H03F2203/45466

摘要： An amplifier device includes: a current amplifier element for amplifying an output current delivered to a capacitive load, such as, for example, a liquid crystal panel in dependency upon changes of the voltage of an input signal; an element for determining the state of changes in the input signal; and a control element for controlling the current amplifier element depending upon the state of changes in the input signal determined by the determination element in order to improve the output driving capability for the load. This amplifier device is applicable to an amplifier in a narrow sense and a buffer circuit in accordance with the mode of amplification. The former may include the configuration in which a second bias circuit for adding a bias current when the driving capability is required to be enhanced is provided in addition to an elementary bias circuit, and the configuration in which a first output drive element and the second output drive element and a plurality of output drive elements succeeding thereto are provided for additionally carrying out switching between incremental output currents. The latter may be classified into two types depending upon whether or not the potential difference element provided on the output side of the buffer circuit to detect a potential difference between the input and the output to add the output current when the the potential difference thus detected is above the threshold level.

摘要翻译： 放大器装置包括：电流放大器元件，用于根据输入信号的电压变化放大输出到电容性负载的输出电流，例如液晶面板; 用于确定输入信号的变化状态的元件; 以及控制元件，用于根据由确定元件确定的输入信号的变化状态来控制电流放大器元件，以便提高负载的输出驱动能力。 该放大器装置适用于狭义上的放大器和根据放大模式的缓冲电路。 前者可以包括除了基本偏置电路之外还提供了在需要增强驱动能力时用于增加偏置电流的第二偏置电路的配置，以及其中第一输出驱动元件和第二输出 驱动元件和其后的多个输出驱动元件被设置用于附加地执行增量输出电流之间的切换。 后者可以分为两种类型，这取决于当这样检测的电位差时，缓冲电路的输出侧的电位差元件是否检测输入和输出之间的电位差以增加输出电流 高于阈值水平。