High voltage to low voltage level shifter

Details High voltage to low voltage level shifter High voltage to low voltage level shifter

2006-06-13

2006-06-13

Nguyen, Long (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Amplitude control

C326S068000, C326S081000

Reexamination Certificate

active

07061298

ABSTRACT:
A shifter circuit comprises, in one embodiment, an input voltage divider stage comprising multiple transistors arranged in a transistor stack defining a plurality of intermediate nodes. The transistor stack is connected between an input signal and ground and has at least one output. An inverting buffer stage is connected to a supply voltage and coupled to the input voltage divider's output. The inverting buffer stage is configured to provide an inverted output signal. Means are provided for stepping up the inverted output signal, receiving a stepped up output signal and providing a level-shifted output signal at a voltage level lower than that of the input signal.

REFERENCES:
patent: 629800 (1899-08-01), Kitade et al.
patent: 5046048 (1991-09-01), Atsumi et al.
patent: 6307421 (2001-10-01), Kawano et al.
patent: 6388470 (2002-05-01), Mattos et al.
patent: 6411554 (2002-06-01), Kawai
patent: 6445240 (2002-09-01), Taheri
patent: 6493414 (2002-12-01), Callahan

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