Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – With specific source of supply or bias voltage
Reexamination Certificate
2006-10-10
2006-10-10
Zweizig, Jeffrey (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
With specific source of supply or bias voltage
Reexamination Certificate
active
07119605
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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Co-pending U.S. Patent App. DS-04-034, filed Sep. 23, 2004, U.S. Appl. No. 10/948,008, assigned to the same assignee as the current invention, “Adaptive Biasing Concept for Current Mode Voltage Regulators.”
Ackerman Stephen B.
Dialog Semiconductor GmbH
Saile Ackerman LLC
Zweizig Jeffrey
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