Circuit for shifting the voltage level of a digital signal

Electronic digital logic circuitry – Interface – Logic level shifting

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326 81, H03K 190175

Patent

active

061114294

ABSTRACT:
A circuit for shifting the voltage level of a digital signal, comprising a first pair of transistors of a first polarity, which are connected to a high-voltage line, and a second pair of transistors of a second polarity, which are connected to a ground line; the first and second pairs of transistors are connected to each other by means of the drain terminals of the respective transistors; an input voltage is applied to the gate terminals of the first pair of transistors. The circuit further includes a secondary circuit for leveling the gate voltages of the transistors of the first and second pairs, which is connected between the first and second pairs of transistors and whereto at least one reference voltage is applied. The circuit also includes an output stage, whose output is a voltage which is shifted in level with respect to the input voltage. The secondary circuit limits the gate-source voltage value of the first pair of transistors to a value which is independent of the voltage value of the high-voltage line, so as to prevent damage to the first pair of transistors.

REFERENCES:
patent: 5378932 (1995-01-01), Shin et al.
patent: 5818257 (1998-10-01), Villa
patent: 5872476 (1999-02-01), Mihara et al.

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