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1. 发明授权

US07196581B2 Amplifier switching control circuit and method for current shunt instrumentation amplifier having extended position and negative input common mode range 有权
标题翻译：具有扩展位置和负输入共模范围的电流分流仪表放大器的放大器开关控制电路和方法
公开(公告)号：US07196581B2
公开(公告)日：2007-03-27
申请号：US11134122
申请日：2005-05-20
申请人： David A. Gammie , Sergey V. Alenin
发明人： David A. Gammie , Sergey V. Alenin
IPC分类号： H03F3/45
CPC分类号： H03F3/45192 , H03F3/45475 , H03F3/45973 , H03F2200/261 , H03F2203/45521
摘要： An amplifier circuit includes first (7A) and second (7B) operational amplifiers connected in a generally parallel configuration, each with inputs coupled through the same pair of matched input resistors which receive a differential input signal that may have both a positive and negative common mode range. An offset adjustment amplifier (17) receives a differential error signal representative of the difference between offset voltages of the first and second operational amplifiers and generates offset adjustment signals that are applied to input stages of the first and second operational amplifiers to adjust their respective offset voltages so as to equalize them. With the offset voltages equalized, the first and second operational amplifiers operate seamlessly as a common mode component of the differential input signal undergoes a transition from its positive to its negative range, so as to avoid inaccuracies and abrupt changes in an output voltage during the transition, the output voltage being produced in response to outputs of both first and second operational amplifiers.
摘要翻译：放大器电路包括以大致平行配置连接的第一（7A）和第二（7B）运算放大器，每个具有通过同一对匹配输入电阻耦合的输入，其接收差分输入信号，所述差分输入信号可以具有正负两者共模范围偏移调整放大器（17）接收表示第一和第二运算放大器的偏移电压之差的差分误差信号，并产生施加到第一和第二运算放大器的输入级的偏移调整信号，以调整其偏移电压以便平衡它们。在偏移电压相等的情况下，第一和第二运算放大器无缝运行，因为差分输入信号的共模分量经历了从其正极到负极的转变，从而避免了转换期间输出电压的不准确和突然变化，输出电压是响应于第一和第二运算放大器的输出产生的。

2. 发明授权

US07239204B2 Current shunt instrumentation amplifier with extended bipolar input common mode range 有权
标题翻译：电流分流仪表放大器，具有扩展双极性输入共模范围
公开(公告)号：US07239204B2
公开(公告)日：2007-07-03
申请号：US11136221
申请日：2005-05-24
申请人： David A. Gammie , Edward Mullins , Jeffery B. Parfenchuck
发明人： David A. Gammie , Edward Mullins , Jeffery B. Parfenchuck
IPC分类号： H03F3/45
CPC分类号： H03F1/34 , H03F3/45475 , H03F2200/261 , H03F2200/513 , H03F2203/45418 , H03F2203/45604
摘要： An amplifier circuit includes first (7A) and second (7B) operational amplifiers connected in a parallel configuration. A first terminal (12) of a first input resistor (5) is coupled to one input of both of the first (7A) and second (7B) amplifiers. A first terminal (15) of a second input resistor (6) is coupled to another input of both of the first (7A) and second (7B) amplifiers. A differential input voltage is applied between the second terminals of the first and second input resistors. The output signals of the first (7A) and second (7B) operational amplifiers are combined to produce an output signal (11AB) representative of feedback currents produced in the first (5) and second (6) input resistors. Upper and lower common mode input voltage ranges associated with the differential input voltage extend substantially above and below the upper and lower supply voltages, respectively, of the amplifier circuit.
摘要翻译：放大器电路包括以并联配置连接的第一（7A）和第二（7B）运算放大器。第一输入电阻器（5）的第一端子（12）耦合到第一（7A）和第二（7B）放大器两者的一个输入端。第二输入电阻器（6）的第一端子（15）耦合到第一（7A）和第二（7B）放大器的另一个输入端。差分输入电压施加在第一和第二输入电阻器的第二端子之间。第一（7A）和第二（7B）运算放大器的输出信号被组合以产生代表在第一（5）和第二输入电阻器（6）中产生的反馈电流的输出信号（11AB）。与差分输入电压相关联的上，下共模输入电压范围分别大致上升和低于放大器电路的上下电源电压。

3. 发明授权

US06801075B2 Method and circuit for base current compensation 有权
标题翻译：基极电流补偿方法及电路
公开(公告)号：US06801075B2
公开(公告)日：2004-10-05
申请号：US10263262
申请日：2002-10-02
申请人： David A. Gammie , Jeffery B. Parfenchuck , Jerry L. Doorenbos
发明人： David A. Gammie , Jeffery B. Parfenchuck , Jerry L. Doorenbos
IPC分类号： G06G714
CPC分类号： G05F3/265
摘要： A base current compensation circuit is configured for injecting base current to the base of a transistor device to compensate for the lost current demanded by a transistor base. The base current compensation circuit is configured to inject current into the base of the transistor without the headroom requirements, as well as being less complex than other approaches. An exemplary base current compensation circuit comprises a sampling circuit and a current mirror feedback circuit configured for providing multiples of the base current demanded by the transistor device.
摘要翻译：基极电流补偿电路被配置为将基极电流注入到晶体管器件的基极以补偿晶体管基极所需的损耗电流。基极电流补偿电路被配置为将电流注入晶体管的基极，而没有余量要求，并且不如其他方法复杂。示例性基极电流补偿电路包括采样电路和被配置为提供晶体管器件所要求的基极电流倍数的电流镜反馈电路。

4. 发明授权

US06667650B2 Current leakage compensation circuit and method 有权
标题翻译：电流泄漏补偿电路及方法
公开(公告)号：US06667650B2
公开(公告)日：2003-12-23
申请号：US10266885
申请日：2002-10-08
申请人： David A. Gammie , Jeffrey B. Parfenchuck , David M. Jones , Jerry L. Doorenbos
发明人： David A. Gammie , Jeffrey B. Parfenchuck , David M. Jones , Jerry L. Doorenbos
IPC分类号： G06G712
CPC分类号： H03F1/302
摘要： A leakage compensation circuit and technique is provided that compensates for losses in a referenced current of an amplifier circuit due to leakage elements. The leakage compensation circuit is configured to inject current substantially equal in magnitude to the leakage current into one or more junctions of the amplifier circuit to compensate for lost referenced current due to leakage. As a result, the amplifier circuit and various devices can realize the flow of the reference current as substantially intended without detrimental effects of leakage current, thus maintaining the integrity of the referenced current. The leakage compensation circuit comprises an array of compensation regions configured to approximate the collective loss that is created by the leakage elements and provide a compensation current substantially equal in magnitude to one or more junctions to compensate for lost referenced current.
摘要翻译：提供一种泄漏补偿电路和技术，其补偿由于泄漏元件引起的放大器电路的参考电流中的损耗。泄漏补偿电路被配置为将大小相等于泄漏电流的电流注入放大器电路的一个或多个结，以补偿由于泄漏引起的丢失的参考电流。结果，放大器电路和各种器件可以实现基本上预期的参考电流的流动，而不会有泄漏电流的有害影响，从而保持参考电流的完整性。泄漏补偿电路包括补偿区域的阵列，其被配置为近似由泄漏元件产生的共同损耗，并提供与一个或多个结点基本相等的补偿电流，以补偿丢失的参考电流。

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