Electronic digital logic circuitry – Interface – Logic level shifting
Patent
1994-12-15
1996-07-02
Westin, Edward P.
Electronic digital logic circuitry
Interface
Logic level shifting
326124, 330288, H03K 1920
Patent
active
055326196
ABSTRACT:
A level shifter circuit for converting an input signal referenced to the least positive power supply (typically ground) to an output signal referenced to a higher, more usable voltage. The level shifter circuit generally includes a current mirror arrangement for coupling first and second current legs. The first current leg includes an NPN bipolar transistor arranged in series with a resistor R and a PNP bipolar transistor, wherein the NPN and PNP transistors have base inputs V.sub.ref and V.sub.in, respectively. The second current leg comprises a series arrangement of a diode-connected NPN bipolar transistor, a resistor R and a diode-connected NPN bipolar transistor. An output voltage (V.sub.OUT =V.sub.ref -V.sub.in), is taken at the collector of the diode-connected NPN transistor in the second current leg.
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International Business Machines - Corporation
Kotulak Richard M.
Sanders Andrew
Westin Edward P.
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