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    • 4. 发明申请
    • OPTIMIZED RESISTOR NETWORK FOR PROGRAMMABLE TRANSCONDUCTANCE STAGE
    • 用于可编程交叉级的优化电阻网络
    • US20090184762A1
    • 2009-07-23
    • US12338571
    • 2008-12-18
    • Viola Schaffer
    • Viola Schaffer
    • H03F1/36
    • H03G1/0088
    • A voltage-to-current converter is provided. The voltage-to-current converter comprises an amplifier, a resistor network, an R-2R network, and switches. The amplifier has a first input node (which is an input signal), a second input node, and an output node. The resistor network is coupled to the output node of the amplifier, includes a plurality of resistors coupled in series with on another, and includes a plurality of first tap nodes. The R-2R network is coupled to the resistor network and includes a plurality of second tap nodes. Additionally, at least one switch is coupled between the second input node of the amplifier and each first tap node, and at least one switch is coupled between the second input node of the amplifier and each of the second tap nodes.
    • 提供一个电压 - 电流转换器。 电压 - 电流转换器包括放大器,电阻网络,R-2R网络和开关。 放大器具有第一输入节点(其是输入信号),第二输入节点和输出节点。 电阻器网络耦合到放大器的输出节点,包括与另一个串联耦合的多个电阻器,并且包括多个第一抽头节点。 R-2R网络耦合到电阻网络并且包括多个第二抽头节点。 另外,至少一个开关耦合在放大器的第二输入节点和每个第一抽头节点之间,并且至少一个开关耦合在放大器的第二输入节点和每个第二抽头节点之间。
    • 5. 发明授权
    • Integrated driver circuit structure
    • 集成驱动电路结构
    • US07425848B2
    • 2008-09-16
    • US11383413
    • 2006-05-15
    • Viola SchafferRodney T. BurtJürgen Metzger
    • Viola SchafferRodney T. BurtJürgen Metzger
    • H03B1/00
    • H03K19/017581
    • An integrated circuit driver structure, comprising an amplifier, a current mirror block and an external current set resistor, is provided that is digitally configurable to operate in a current output mode or in a voltage output mode with its output level controlled by an external voltage. The current mirror block comprises multiple current sources, all having the same gate bias supplied by the output of amplifier. At any time, at least one current source is connected to supply the reference current to resistor, while all other current sources are connected to mirror the reference current to the load current output towards the load. A current gain ratio is based on the number of current sources connected to supply resistor and the number connected to mirror the reference current.
    • 提供了一种集成电路驱动器结构,其包括放大器,电流镜块和外部电流设置电阻器,其可数字配置以在电流输出模式或电压输出模式下工作,其输出电平由外部电压控制。 电流镜块包括多个电流源,全部具有由放大器的输出提供的相同的栅极偏置。 在任何时候,连接至少一个电流源以将参考电流提供给电阻器,而所有其他电流源连接到反向负载电流输出的参考电流。 电流增益比基于连接到电源电阻的电流源的数量和连接到镜像参考电流的数量。
    • 6. 发明申请
    • DETECTING AMPLIFIER OUT-OF-RANGE CONDITIONS
    • 检测放大器超范围的条件
    • US20070194843A1
    • 2007-08-23
    • US11462842
    • 2006-08-07
    • Viola SchafferMikhail Ivanov
    • Viola SchafferMikhail Ivanov
    • G01R19/00
    • H03F3/303H03F3/45183H03F2203/45478H03F2203/45484
    • Out-of-range conditions are detected in amplifier CMOS or BiCMOS circuitry that includes a control transistor (MS) connected in series with a cascode transistor (MSC), and a differential amplifier (A1) with an inverting input connected to the node between the control transistor and the cascode transistor, a non-inverting input connected to a reference voltage source (VRDS) and an output connected to the gate of the cascode transistor (MSC). The voltage at the output of the differential amplifier (A1) is monitored, and an error condition is determined when the voltage exceeds or drops below a predetermined threshold value. The invention considerably widens the useful operating range, without requiring sophisticated or complex detection circuitry.
    • 在包括与共源共栅晶体管(M SUB SC)串联连接的控制晶体管(M SUB S S S)的放大器CMOS或BiCMOS电路中检测超范围条件,以及 具有连接到控制晶体管和共源共栅晶体管之间的节点的反相输入的差分放大器(A 1),连接到参考电压源(VRDS DS)的非反相输入和连接的输出 到共源共栅晶体管(M SUB SC)的栅极。 监视差分放大器(A 1)输出端的电压,当电压超过或低于预定阈值时,确定出错状态。 本发明显着地拓宽了有用的操作范围,而不需要复杂的或复杂的检测电路。
    • 7. 发明申请
    • VOLTAGE CONTROLLED CURRENT SOURCE DEVICE
    • 电压控制电流源装置
    • US20060255787A1
    • 2006-11-16
    • US11383320
    • 2006-05-15
    • Viola SchafferRodney BurtJurgen Metzger
    • Viola SchafferRodney BurtJurgen Metzger
    • G05F3/16
    • G05F3/262
    • An integrated voltage controlled current source device is provided, that extends the high accuracy, low drift output current over a large current range, and provides more headroom and better power efficiency than the standard shunt resistor and INA (instrumentation amplifier) current source arrangement. The device has a control voltage input, a load current output and a current set terminal for a connection of a current set resistor. It contains a selected leg biasing set voltage, corresponding to a control voltage applied to the control voltage input of a regulating driver amplifier providing a regulated voltage to be applied across the current set resistor, thereby causing a reference current to flow through the current set resistor and selected leg(s) of a current mirror. Furthermore, the device contains a dynamically matched current mirror that mirrors the reference current to the load output current. The algorithm for selecting the current mirror legs may be a pseudo-random or a defined pattern.
    • 提供集成的电压控制电流源装置,其在大电流范围内延伸高精度,低漂移输出电流,并且比标准分流电阻器和INA(仪表放大器)电流源装置提供更大的净空和更好的功率效率。 该器件具有控制电压输入,负载电流输出和用于连接电流设定电阻的电流设置端子。 它包含一个选定的支路偏置设定电压,对应于施加到调节驱动放大器的控制电压输入端的控制电压,该调节驱动放大器提供施加在电流设定电阻器两端的调节电压,从而使参考电流流过电流设定电阻器 和当前镜像的选定的腿。 此外,该器件还包含一个动态匹配的电流镜,将电流反映到负载输出电流。 用于选择当前镜腿的算法可以是伪随机的或定义的模式。
    • 9. 发明申请
    • Slew rate and settling time improvement circuitry and method for 3-stage amplifier
    • 3级放大器的转换速率和建立时间改善电路和方法
    • US20090278597A1
    • 2009-11-12
    • US12151503
    • 2008-05-07
    • Joy Y. ZhangViola Schaffer
    • Joy Y. ZhangViola Schaffer
    • H03F1/02
    • H03F3/005H03F3/387H03F3/45475H03F2200/261H03F2200/408H03F2203/45138H03F2203/45248H03F2203/45512H03H19/004
    • An operational amplifier (1B) amplifies an input signal (Vin) to produce an output signal (Vout), and includes a 3-stage amplifier (1C) including a first amplifier stage (2) receiving the input signal, a second amplifier stage (3) driven by the first amplifier stage (2), and a third amplifier stage (4) driven by the second amplifier stage to produce the output signal. A slew detection current (Idetect) is generated when the input signal (Vin) exceeds a certain magnitude, and is converted to a control signal (41) that operates a switch (MN0) to short-circuit output conductors of the first amplifier stage to prevent signal charge from building up on capacitances associated with the output of the first amplifier stage during slewing. The three stage amplifier can be a chopper-stabilized, notch-filtered amplifier.
    • 运算放大器(1B)放大输入信号(Vin)以产生输出信号(Vout),并且包括一个包括接收输入信号的第一放大器级(2)和第二放大级(3)的三级放大器(1C) 由第一放大器级(2)驱动的第三放大级(4)和由第二放大级驱动的第三放大级(4)产生输出信号。 当输入信号(Vin)超过一定量值时,产生转换检测电流(Idetect),并转换成操作开关(MN0)的控制信号(41),使第一放大级的输出导体短路到 防止在回转期间与第一放大器级的输出相关联的电容上的信号电荷积聚。 三级放大器可以是斩波稳定的陷波滤波放大器。