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1. 发明授权

US5517103A Reference current source for low supply voltage operation 失效
标题翻译：用于低电源电压工作的参考电流源
公开(公告)号：US5517103A
公开(公告)日：1996-05-14
申请号：US105450
申请日：1993-08-12
申请人： Solomon K. Ng , Gee H. Loh
发明人： Solomon K. Ng , Gee H. Loh
IPC分类号： G05F3/26 , G05F3/30 , G05F3/20
CPC分类号： G05F3/265 , Y10S323/901 , Y10S323/907
摘要： A circuit for providing a reference current comprises first and second matched transistors, each of which has a control node and a controllable path and each of which is connected so that a current setting resistor is in the controllable path of the second matched transistor, the current setting resistor having a value, current set in the controllable path of the second matched transistor is related to a difference in voltage characteristics between the first and second matched transistors and to the value of the current setting resistor, and third and fourth matched transistors, each of the third and fourth matched transistors having a controllable path connected respectively to the controllable paths of the first and second matched transistors, and control electrodes of the third and fourth matched transistors connected together; a set of output transistors connected to the circuit to supply the reference current in dependence on a set current; and a fifth transistor having a controllable path between a bias node related to a first supply voltage level and a node set at one voltage characteristic relative to a second supply voltage level so as to maintain a voltage across one of the third and fourth matched transistors at a value which is independent of the first supply voltage level to reduce a magnitude of changes in the reference current as a function of the first supply voltage, the fifth transistor having a control electrode connected to the conductive path of the first matched transistor.
摘要翻译：用于提供参考电流的电路包括第一和第二匹配晶体管，每个晶体管具有控制节点和可控路径，并且每个晶体管连接成使得电流设定电阻处于第二匹配晶体管的可控路径中，具有值的设定电阻器，设定在第二匹配晶体管的可控路径中的电流与第一和第二匹配晶体管之间的电压特性的差异与电流设定电阻器的值以及第三和第四匹配晶体管的每个所述第三和第四匹配晶体管具有分别连接到所述第一和第二匹配晶体管的可控路径的可控路径，以及连接在一起的所述第三和第四匹配晶体管的控制电极; 连接到电路的一组输出晶体管，以根据设定的电流提供参考电流; 以及第五晶体管，其具有在与第一电源电压电平相关的偏置节点和设置在相对于第二电源电压电平的一个电压特性处的节点之间的可控路径，以便将第三和第四匹配晶体管中的一个上的电压保持在该值与第一电源电压电平无关，以减小作为第一电源电压的函数的参考电流的变化幅度，第五晶体管具有连接到第一匹配晶体管的导电路径的控制电极。

2. 发明授权

US5486788A Chopper stabilized operational transconductance amplifier 失效
标题翻译：斩波器稳定运行跨导放大器
公开(公告)号：US5486788A
公开(公告)日：1996-01-23
申请号：US320142
申请日：1994-10-07
申请人： Karl M. Schlager , Solomon K. Ng
发明人： Karl M. Schlager , Solomon K. Ng
IPC分类号： H03F1/30 , H03F1/02 , H03F1/14
CPC分类号： H03F1/303
摘要： A chopper stabilized current amplifier circuit is disclosed. The current amplifier circuit includes a main operational transconductance amplifier, a nulling transconductance amplifier, two capacitors, four switches, and a timing control circuit. The timing control circuit uses analog inverters to decrease the slew rate of the switching of the switches to decrease the noise in the system.
摘要翻译：公开了一种斩波稳定电流放大器电路。电流放大器电路包括主要的运算跨导放大器，零空间跨导放大器，两个电容器，四个开关和定时控制电路。定时控制电路使用模拟逆变器来降低开关切换的转换速率，以降低系统中的噪声。

3. 发明授权

US06344770B1 Bandgap reference circuit with a pre-regulator 有权
标题翻译：带隙预参考电路
公开(公告)号：US06344770B1
公开(公告)日：2002-02-05
申请号：US09643171
申请日：2000-08-21
申请人： Gang Zha , Solomon K. Ng
发明人： Gang Zha , Solomon K. Ng
IPC分类号： G05F1575
CPC分类号： G05F3/30
摘要： A bandgap reference circuit has a pre-regulator that achieves a low temperature coefficient through the use of a VBE multiplier and feedback from the output bandgap voltage VBG. This low temperature coefficient in the pre-regulator allows the bandgap reference circuit to output the bandgap voltage VBG with a low temperature coefficient.
摘要翻译：带隙参考电路具有通过使用VBE乘法器和来自输出带隙电压VBG的反馈来实现低温度系数的预调节器。预调节器中的这种低温度系数允许带隙基准电路以低温度系数输出带隙电压VBG。

4. 发明授权

US06542027B2 Bandgap reference circuit with a pre-regulator 有权
公开(公告)号：US06542027B2
公开(公告)日：2003-04-01
申请号：US09989221
申请日：2001-11-20
申请人： Gang Zha , Solomon K. Ng
发明人： Gang Zha , Solomon K. Ng
IPC分类号： G05F1563
CPC分类号： G05F3/30
摘要： A bandgap reference circuit has a pre-regulator that achieves a low temperature coefficient through the use of a first component that generates a first voltage having a negative temperature coefficient and a second component coupled in series to the first component and which generates a second voltage having a positive temperature coefficient. This low temperature coefficient in the pre-regulator allows the bandgap reference circuit to output the bandgap voltage VBG with a low temperature coefficient.

5. 发明授权

US5514939A Circuitry for switching the body nodes of driver transistors in drive circuitry for brushless DC motors 失效
标题翻译：用于切换用于无刷直流电动机的驱动电路中的驱动晶体管的体节点的电路
公开(公告)号：US5514939A
公开(公告)日：1996-05-07
申请号：US330382
申请日：1994-10-27
申请人： Karl M. Schlager , Francesco Carobolante , Solomon K. Ng
发明人： Karl M. Schlager , Francesco Carobolante , Solomon K. Ng
IPC分类号： H02P6/00 , H02P6/14 , H03K17/0814 , H03K17/16 , H02P7/00
CPC分类号： H03K17/162 , H02P6/14 , H02P6/34 , H03K17/08142
摘要： Circuitry for selectably connecting the body node of drive transistors of a motor control circuit. In particular, those transistors that are turned off when operating the motor in a unipolar mode have their body nodes switched so as to be connected to a reference voltage, such as ground, during unipolar mode, and to be connected to the transistor source during bipolar mode (i.e., when the transistors are active). The circuitry also is operable to briefly connect the body nodes of the transistors to their source when the opposing drive transistor is commutated, in the unipolar mode. In this way, forward biasing of inherent diodes in the drive transistor is avoided in unipolar mode, except when useful to clamp the inductive kick of the motor coils.
摘要翻译：用于可选地连接电动机控制电路的驱动晶体管的体节点的电路。特别地，当以单极模式操作电动机时关闭的那些晶体管在其单极模式下切换其体节点以便连接到参考电压，例如接地，并且在双极模式期间连接到晶体管源极模式（即当晶体管有效时）。该电路还可操作以在单极模式下将相对的驱动晶体管换向时将晶体管的体节点短暂地连接到其源极。以这种方式，在单极模式下避免了驱动晶体管中固有二极管的正向偏置，除非用于钳位电动机线圈的感应脚蹬。

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