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1. 发明授权

US5856742A Temperature insensitive bandgap voltage generator tracking power supply variations 失效
标题翻译：温度不敏感带隙电压发生器跟踪电源变化
公开(公告)号：US5856742A
公开(公告)日：1999-01-05
申请号：US873902
申请日：1997-06-12
申请人： Salomon Vulih , Stanley Frank Wietecha , John A. Olmstead , Thomas D. Housten
发明人： Salomon Vulih , Stanley Frank Wietecha , John A. Olmstead , Thomas D. Housten
IPC分类号： G05F3/30 , G05F3/16 , G05F3/04
CPC分类号： G05F3/30 , Y10S323/901
摘要： A circuit for generating a bandgap voltage that is insensitive to temperature. The circuit includes an amplifier with a feedback loop having a high impedance output current mirror controlled by transistors connected to an output from the amplifier. The current mirror provides proportional currents to a pair of resistors that are connected to inputs to the amplifier, a first input receiving a temperature sensitive voltage from a first of the resistors, and a second input receiving a voltage that is a combination of a temperature sensitive voltage across a second of the resistors and a temperature sensitive offsetting voltage. The second resistor may be tapped to provide a selectable bandgap voltage. A reference voltage for operating the generator may be obtained from a voltage division of supply voltage by two resistors of the same type.
摘要翻译：用于产生对温度不敏感的带隙电压的电路。该电路包括具有反馈回路的放大器，该反馈回路具有由连接到放大器的输出的晶体管控制的高阻抗输出电流镜。电流镜向连接到放大器的输入的一对电阻器提供成比例的电流，第一输入接收来自第一电阻器的温度敏感电压，以及接收电压的第二输入，该电压是温度敏感的跨越第二个电阻器的电压和温度敏感的偏移电压。第二电阻器可以被抽头以提供可选择的带隙电压。用于操作发电机的参考电压可以通过相同类型的两个电阻器的电源电压分压来获得。

2. 发明授权

US5736885A Offset adjustment for fully differential amplifiers 失效
标题翻译：全差分放大器的偏移调整
公开(公告)号：US5736885A
公开(公告)日：1998-04-07
申请号：US494395
申请日：1995-06-26
申请人： Stanley Frank Wietecha , Thomas D. Housten , John A. Olmstead
发明人： Stanley Frank Wietecha , Thomas D. Housten , John A. Olmstead
IPC分类号： H03F3/45
CPC分类号： H03F3/45197 , H03F3/45744
摘要： A circuit for providing an input offset voltage to balance a fully differential amplifier may include two field effect transistors (FETs) in parallel conductive paths for receiving a current, an amplifier current source, a resistor connecting the FETs at their drains, and a second amplifier with inputs for an offset correction voltage and for a reference voltage on which the fully differential amplifier is to be balanced and outputs for providing control inputs to the FETs. The input offset voltage for balancing the fully differential amplifier is the difference between currents in the parallel paths times the resistance of the resistor. The circuit may be used to balance a fully differential amplifier in a telephone CODEC. The correction voltage may correct the total offset from the CODEC, or the offset introduced by a sign bit integrator that provides a correction for excursions of the same polarity in the CODEC.
摘要翻译：用于提供输入失调电压以平衡全差分放大器的电路可以包括用于接收电流的两个场效应晶体管（FET），用于接收电流，放大器电流源，在其漏极处连接FET的电阻器和第二放大器具有用于偏移校正电压和用于平衡全差分放大器的参考电压的输入，以及用于向FET提供控制输入的输出。用于平衡全差分放大器的输入失调电压是并联路径中的电流与电阻的电阻之差。该电路可用于平衡电话CODEC中的全差分放大器。校正电压可以校正来自CODEC的总偏移量，或由符号位积分器引入的补偿，其提供对CODEC中相同极性偏移的校正。

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