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US Patent 7119605 Dynamic transconductance boosting technique for current mirrors

Patent 7119605 was granted and assigned to Dialog Semiconductor PLC on October, 2006 by the United States Patent and Trademark Office.

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Current Assignee
Dialog Semiconductor PLC
Dialog Semiconductor PLC
Patent Jurisdiction
United States Patent and Trademark Office
United States Patent and Trademark Office
Patent Number
7119605
Patent Inventor Names
Matthias Eberlein1
Date of Patent
October 10, 2006
Patent Application Number
10948007
Date Filed
September 23, 2004
Patent Primary Examiner
‌
Jeffrey Zweizig
Patent abstract

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.

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