Electronic digital logic circuitry – Interface – Logic level shifting
Reexamination Certificate
2005-03-29
2005-03-29
Tokar, Michael (Department: 2819)
Electronic digital logic circuitry
Interface
Logic level shifting
C326S062000
Reexamination Certificate
active
06873186
ABSTRACT:
In a level shift circuit, for example, when an input signal IN changes from the L level to the H level, an N-type signal input transistor is made conducting and current flows in the N-type transistor. Accordingly, a first current mirror circuit amplifies the current flowing in the N-type transistor by predetermined number of times, increases the current driving capability for an inverted output node, and changes the inverted output node quickly to the L level. With the change to the L level of the inverted output node, an output node changes to the H level, a P-type transistor (first current interrupting circuit) is made non-conducting by the change, and the current fed from the first current mirror circuit is interrupted. Therefore, even when the power source voltage for the input signal and the inverted input signal is lowered, the operation is performed at high speed.
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Matsushita Electric - Industrial Co., Ltd.
McDermott Will & Emery LLP
Nguyen Linh V
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