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1.发明授权
公开(公告)号：US5973537A
公开(公告)日：1999-10-26
申请号：US948986
申请日：1997-10-10
CPC分类号： H03F3/005 , H03F3/45946 , H03F2203/45421
摘要： In switch-capacitor systems for extremely low supply voltage, employing a fully differential switched op-amp, proper functioning of nMOS switches coupled to the inverting input node of an integrated stage capable of outputting a common mode control signal is made possible by retaining the ground potential on the input node to prevent body effects on the threshold of nMOS switches by means of an auxiliary switched capacitor.
摘要翻译： 在采用完全差分开关运算放大器的开关电容器系统中，通过使用完全差分开关运算放大器，可以通过保持接地来实现耦合到能够输出共模控制信号的集成级的反相输入节点的正常功能 输入节点上的电位，以通过辅助开关电容器来防止身体对nMOS开关阈值的影响。
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公开(公告)号：US5994960A
公开(公告)日：1999-11-30
申请号：US948562
申请日：1997-10-10
CPC分类号： H03F3/72 , H03F1/086 , H03F2200/513
摘要： In a switched operational amplifier including a differential input stage and at least a second output stage, the compensation capacitor commonly required to couple the output node of the second stage with the respective output node of the input differential stage of the amplifier is associated with a switching circuit. The switching circuit is controlled by the same control phase that enables/disables the amplifier for interrupting the connection between the compensation capacitor (CC) and the output node of the differential input stage during a phase in which the amplifier is disabled for reducing the switch-on time. Notably the differential input stage of the operational amplifier remains always active and only the second output stage is switched on and off.
摘要翻译： 在包括差分输入级和至少第二输出级的开关运算放大器中，将第二级的输出节点与放大器的输入差分级的相应输出节点耦合起来的补偿电容器与切换 电路。 开关电路由相同的控制相位控制，使得放大器能够在禁止放大器以减少开关电流的相位期间中断补偿电容器（CC）和差分输入级的输出节点之间的连接， 准时。 值得注意的是，运算放大器的差分输入级保持始终有效，只有第二个输出级接通和关断。
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3.发明授权Low voltage, switched capacitance circuit employing switched operational amplifiers with maximized voltage swing 失效采用具有最大电压摆幅的开关式运算放大器的低电压，开关电容电路
公开(公告)号：US5745002A
公开(公告)日：1998-04-28
申请号：US326107
申请日：1994-10-19
CPC分类号： H03H19/00
摘要： A switched capacitance circuit, using a switched operational amplifier structure as an input switch of the switched capacitance, is provided with a new biasing circuit. An additional switched capacitor, switched alternately to power supply and to ground, is connected to the output side of the primary switched capacitor. Precision is retained while ensuring a rail-to-rail dynamic range, without requiring boosted control phases. Special arrangements may be implemented for controlling the amplitude of switching spikes when so required. A fully differential embodiment is also feasible with additional advantages.
摘要翻译： 使用开关运算放大器结构作为开关电容的输入开关的开关电容电路设置有新的偏置电路。 另一个开关电容器交替地切换到电源和地，连接到初级开关电容器的输出侧。 在保证轨到轨动态范围的同时保持精度，而无需增强控制阶段。 当需要时，可以实施用于控制开关尖峰的幅度的特殊布置。 完全差异化的实施例也是可行的，具有额外的优点。
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公开(公告)号：US5332937A
公开(公告)日：1994-07-26
申请号：US942678
申请日：1992-09-09
CPC分类号： H03F3/45179 , H03F3/45286 , H03F2203/45024 , H03H11/0433
摘要： A transconductor differential stage for high-frequency filters, which has a MOS differential input pair with common sources. The drain of each MOS input is connected to the emitter of an npn bipolar. These two matched bipolars have their gates connected together with the gate of a third bipolar, which is diode-connected. Two matched current sources feed the two bipolars, and a third current source feeds the third bipolar. A single controlled current sink is connected to the sources of both MOS input transistors, and also (through a resistor) to the third bipolar.
摘要翻译： 用于高频滤波器的跨导差分级，具有通用源的MOS差分输入对。 每个MOS输入的漏极连接到npn双极的发射极。 这两个匹配的双极子的栅极与第二极二极管连接的第三极的栅极连接在一起。 两个匹配的电流源馈送两个双极，第三个电流源馈送第三个双极。 单个受控电流吸收器连接到两个MOS输入晶体管的源极，并且（通过电阻器）连接到第三极。
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公开(公告)号：US06380789B1
公开(公告)日：2002-04-30
申请号：US09060617
申请日：1998-04-15
IPC分类号： G06G718
CPC分类号： G06G7/12 , H03F3/72 , H03F2203/7215
摘要： A switched input circuit structure of the type which includes an input terminal receiving an input voltage and an output terminal connected to an input capacitor. An operational amplifier is included having a non-inverting terminal connected to a ground reference terminal, an inverting input terminal, and an output terminal feedback connected to the inverting input terminal and held in a virtual ground condition by a parallel of first and second charge paths which are connected between the input terminal of the switched input circuit structure and the inverting input terminal of the operational amplifier and connected to the supply voltage reference and the ground reference, respectively.
摘要翻译： 一种切换输入电路结构，其类型包括接收输入电压的输入端和连接到输入电容的输出端。 包括运算放大器，其具有连接到接地参考端子的非反相端子，反相输入端子和连接到反相输入端子的输出端子反馈，并且通过第一和第二充电路径的并联保持在虚拟接地状态 它们连接在开关输入电路结构的输入端和运算放大器的反相输入端之间，分别连接到电源电压基准和接地基准。
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6.发明授权Method for erasing a common mode current signal and transconductor assembly using such method 失效使用这种方法擦除共模电流信号和跨导体组件的方法
公开(公告)号：US5696457A
公开(公告)日：1997-12-09
申请号：US454649
申请日：1995-05-31
CPC分类号： H03F3/45964 , H03F3/45278 , H03F3/45717 , H03F2203/45024 , H03F2203/45068 , H03F2203/45078 , H03F2203/45394 , H03F2203/45648
摘要： A low-voltage transconductor circuit in which the common mode gain of a first transconductor stage is compensated by a second transconductor stage (connected in parallel with the first transconductor stage) which has no differential mode transconductance, and which is connected so that its common mode transconductance offsets the common mode transconductance of the stage. This greatly reduces the common mode current signal at the output, while avoiding the necessity for a current sink at the source of the input transistors.
摘要翻译： 一种低压跨导电路，其中第一跨导级的共模增益由不具有差分晶体跨导的第二跨导级（与第一跨导级并联连接）补偿，并且其连接使得其共模 跨导抵消了该级的共模跨导。 这大大降低了输出端的共模电流信号，同时避免了在输入晶体管的源极处的电流吸收器的必要性。
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7.发明授权First and second order CMOS elementary cells for time-continuous analog filters 失效用于时间连续模拟滤波器的一阶和二阶CMOS单元
公开(公告)号：US6031416A
公开(公告)日：2000-02-29
申请号：US67127
申请日：1998-04-27
CPC分类号： H03H11/04
摘要： A CMOS elementary cell of the first order for time-continuous analog filters with non-linearity compensation, is connected between a first supply voltage reference and a second voltage reference. The cell is of a type which comprises at least a first MOS transistor having its conduction terminals connected to the first supply voltage reference and to an output terminal, and having a control terminal connected to an input terminal of the first order CMOS elementary cell. The cell further comprises a second MOS transistor in diode configuration, and an equivalent capacitor, both connected to the output terminal of the first order CMOS elementary cell. The second, diode-connected MOS transistor and the equivalent capacitor act as a load for the first MOS transistor. The first MOS transistor operates as a drive transistor operatively tied to an input voltage signal being supplied to the input terminal of the first order CMOS elementary cell. A second order filter CMOS elementary cell is similarly connected.
摘要翻译： 具有非线性补偿的时间连续模拟滤波器的第一阶CMOS元件连接在第一电源电压基准和第二参考电压之间。 电池是至少包括其导通端子连接到第一电源电压基准的第一MOS晶体管和输出端子，并且具有连接到第一级CMOS基本单元的输入端子的控制端子的类型。 电池还包括二极管配置的第二MOS晶体管和等效电容器，两者均连接到一阶CMOS元件单元的输出端子。 第二个二极管连接的MOS晶体管和等效电容器用作第一MOS晶体管的负载。 第一MOS晶体管作为驱动晶体管工作，该驱动晶体管可操作地连接到被提供给第一阶CMOS元件单元的输入端的输入电压信号。 类似地连接二阶滤波器CMOS单元。
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公开(公告)号：US06411166B1
公开(公告)日：2002-06-25
申请号：US09864916
申请日：2001-05-23
IPC分类号： H03F345
摘要： A switched operational amplifier with fully differential topology, alternately switchable on and off, and a control circuit. The operational amplifier has a first differential output (4a) and a second differential output, and a control terminal. The control circuit includes a capacitive detecting network including a first capacitor and a second capacitor connected between the first and second differential outputs and a common-mode node, and a third capacitor connected between the common-mode node and ground in a first operative condition, and between the common-mode node and the supply voltage in a second operative condition. A control transistor is connected between the common-mode node and the control terminal of the operational amplifier and supplies a control current correlated to the voltage on the common-mode node. A switchable voltage source, connected to the common-mode node, supplies a desired voltage in a first operative condition, when the operational amplifier is off.
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9.发明授权Transconductor circuit with high-linearity double input and active filter thereof 失效具有高线性双输入和有源滤波器的跨导电路
公开(公告)号：US5576646A
公开(公告)日：1996-11-19
申请号：US473533
申请日：1995-06-07
CPC分类号： H03F3/45076 , H03H11/0433 , H03F2200/261
摘要： The invention relates to a transconductor circuit with a double input and a single output, comprising two input transistors (M1, M2) whose primary conduction terminals (D1, S1, D2, S2) are respectively connected together; in this way, variations in load current and voltage can be made lower, thereby also lowering distortion from changes in their transconductance.
摘要翻译： 本发明涉及具有双输入和单输出的跨导电路，包括其一次导通端子（D1，S1，D2，S2）分别连接在一起的两个输入晶体管（M1，M2） 以这种方式，可以降低负载电流和电压的变化，从而也降低其跨导变化的变形。
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公开(公告)号：US5495166A
公开(公告)日：1996-02-27
申请号：US45465
申请日：1993-04-08
CPC分类号： G05F3/24 , H03K17/145
摘要： A threshold voltage generator for a field-effect transistor, being of a type adapted to compensate for variations of the threshold voltage from a nominal value, comprising a first amplifier having a first input connected to a current generator; a second amplifier connected ahead of a second input of the first amplifier and having an input connected to another current generator; and a third amplifier connected after the first amplifier and having an output adapted to produce the value of said threshold voltage.
摘要翻译： 一种用于场效应晶体管的阈值电压发生器，其类型适于补偿阈值电压与标称值的变化，包括具有连接到电流发生器的第一输入的第一放大器; 连接在第一放大器的第二输入端的第二放大器，并具有连接到另一电流发生器的输入端; 以及连接在所述第一放大器之后并具有适于产生所述阈值电压值的输出端的第三放大器。
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