High speed transient immune differential level shifting device

Details High speed transient immune differential level shifting device High speed transient immune differential level shifting device

2007-05-01

2007-05-01

Cho, James H. (Department: 2819)

Electronic digital logic circuitry

Interface

Logic level shifting

C326S086000

Reexamination Certificate

active

11090539

ABSTRACT:
A level shifting device having an input side operating at a first voltage level, an output side operating at a second voltage level and a level shifting circuit which connects the input and output sides. The input circuit receives an input signal referenced to the first voltage level and provides separate outputs corresponding to transitions of the input signal. The level shifting circuit includes MOSFETS having the gates connected respectively to each output of the input circuit; and the source-drain path coupled between the second voltage and a reference for the first voltage. The output side has a differential topology, and includes a first circuit which samples signals corresponding to the transitions of the input signal, holds the sample between transitions, and an output circuit which receives the held sample signal in differential form and converts it to single-ended form for use by other circuits. The circuit also blocks input signals when common mode transients are present. The device is realized as an integrated circuit using exclusively n-channel MOSFETS in the critical path of operation.

REFERENCES:
patent: 5313121 (1994-05-01), Cianci et al.
patent: 6933765 (2005-08-01), Kanno et al.
patent: 7046037 (2006-05-01), Tyhach et al.

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