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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

US4939479A Audio amplifier 失效
标题翻译：音频放大器
公开(公告)号：US4939479A
公开(公告)日：1990-07-03
申请号：US401056
申请日：1989-08-31
申请人： Gee H. Loh
发明人： Gee H. Loh
IPC分类号： H03F1/26 , H03F1/30 , H03F3/183 , H03F3/45
CPC分类号： H03F3/183 , H03F1/302
摘要： An audio amplifier comprises a first current mirror having an input coupled to an output of a cascade differential pair and an output coupled to an output of a first constant current source. A second constant current source (Q16, Q18, CC10) supplies the voltage reference (Q15) of the first constant current source. Hitherto a resistor has been used instead of the second constant current source to reduce noise. However, using a resistor results in the amplifier having a relatively low power supply rejection ratio, thereby degrading the performance of the amplifier. Accordingly the present invention uses a second constant current source to improve the power supply rejection ratio without degrading the noise performance.
摘要翻译：音频放大器包括具有耦合到级联差分对的输出的输入和耦合到第一恒定电流源的输出的输出的第一电流镜。第二恒流源（Q16，Q18，CC10）提供第一恒流源的电压基准（Q15）。迄今为止，已经使用电阻器代替第二恒流源来降低噪声。然而，使用电阻器导致放大器具有相对低的电源抑制比，从而降低放大器的性能。因此，本发明使用第二恒流源来提高电源抑制比而不降低噪声性能。

3. 发明授权

US5627732A Multiple output current mirror 失效
标题翻译：多输出电流镜
公开(公告)号：US5627732A
公开(公告)日：1997-05-06
申请号：US448803
申请日：1995-05-24
申请人： Gee H. Loh , Mario Santi
发明人： Gee H. Loh , Mario Santi
IPC分类号： G05F3/26 , H03F3/343 , H03F3/347 , G05F3/02
CPC分类号： G05F3/265
摘要： A multiple output current mirror comprising at least three mirror-connected PNP transistors whose bases are connected to a first node, at least three cascode-connected transistors, each cascode transistor being associated to one mirror transistor, a current input corresponding to the collector of the first cascode transistor, and mirror outputs corresponding to the collectors of the two other cascode transistors. The current mirror further comprising means for detecting the base current of each mirror transistor and for reproducing this base current on the collector of the cascode transistor to which each mirror transistor is associated.
摘要翻译：多输出电流镜，包括至少三个镜像连接的PNP晶体管，其基极连接到第一节点，至少三个共源共栅连接晶体管，每个共源共栅晶体管与一个反射镜晶体管相关联，电流输入对应于第一共源共栅晶体管和对应于两个其他共源共栅晶体管的集电极的反射镜输出。电流镜还包括用于检测每个反射镜晶体管的基极电流并用于在每个反射镜晶体管相关联的共源共栅晶体管的集电极上再现该基极电流的装置。

4. 发明授权

US5563503A Source/sink current generating circuit system 失效
标题翻译：源/汇电流发生电路系统
公开(公告)号：US5563503A
公开(公告)日：1996-10-08
申请号：US208360
申请日：1994-03-08
申请人： Solomon K. L. Ng , Gee H. Loh
发明人： Solomon K. L. Ng , Gee H. Loh
IPC分类号： G05F3/22 , G05F3/26 , G05F3/16 , H03F3/04
CPC分类号： G05F3/22 , G05F3/265
摘要： A source/sink current generating circuit is arranged to generate source and sink currents which are matched and insensitive to fan out. This is achieved by using a biasing transistor (Q13) between first and second current mirrors which generate respectively the source and sink currents.
摘要翻译：源/宿电流产生电路被布置成产生与扇出匹配和不敏感的源极和吸收电流。这通过使用分别产生源极和吸收电流的第一和第二电流镜之间的偏置晶体管（Q13）来实现。

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