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dynamic transkonduktanz - erhu00f6hungstechnik for stromspiegel

机译：电流镜动态跨导增强技术

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摘要

Circuits and methods to increase the transconductance of a current mirror in case of small input currents of the current mirror without affecting the transconductance of said current mirror in case of large input currents have been achieved. Key of the invention is a "bypass" formed by a transistor in series with a resistor, wherein the bypass is in parallel to the input transistor of the current mirror. This bypass is only relevant for very small input currents wherein the resistor can be neglected compared to the impedance of the bypass-transistor and therefore the total transconductance of the current mirror is increased in case of very small input currents. For large input currents the resistor of the bypass effectively blocks the "bypass" path. The invention solves e.g. a problem of amplifiers having any kind of dynamic biasing namely that the input impedance of current mirrors becomes too large for very small input currents.

机译：已经实现了在电流镜的输入电流较小的情况下增加电流镜的跨导而不在大电流输入的情况下影响所述电流镜的跨导的电路和方法。本发明的关键是由与电阻器串联的晶体管形成的“旁路”，其中旁路与电流镜的输入晶体管并联。该旁路仅适用于非常小的输入电流，其中与旁路晶体管的阻抗相比，可以忽略电阻，因此，在非常小的输入电流的情况下，电流镜的总跨导会增加。对于大输入电流，旁路电阻会有效地阻塞“旁路”路径。本发明解决例如放大器具有任何类型的动态偏置的问题，即对于非常小的输入电流，电流镜的输入阻抗变得太大。

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公开/公告号DE602004025466D1

专利类型
公开/公告日2010-03-25

原文格式PDF
申请/专利权人 DIALOG SEMICONDUCTOR GMBH;
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申请/专利号DE20046025466T
发明设计人 EBERLEIN MATTHIAS;
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申请日2004-09-14
分类号G05F3/26;
国家 DE
入库时间 2022-08-21 18:27:33

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