Current supply circuit for driving high capacitance load in an integrated circuit
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United States of America Patent
Stats
-
Jul 28, 1992
Grant Date -
N/A
app pub date -
Jan 23, 1991
filing date -
Jan 23, 1991
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A constant current power supply circuit for an integrated circuit memory which is well suited for driving a high capacitance load, such as a large number of sense amplifiers. A first circuit provides a constant current source and a second 'current mirror' circuit provides an output current proportionate to the first circuit, but at a higher desired level of current. The constant current circuit is achieved using two cross-coupled FET transistors and two resistances such that the conductivity of each transistor is inversely related to the conductivity of the other. The circuit reaches a constant current equilibrium which is largely independent of operating voltage or load, but rather depends on the relative values of the components.
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