Fail safe level shifter

Details Fail safe level shifter Fail safe level shifter

1991-08-19

1992-10-06

LaRoche, Eugene R.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307264, 307268, H03K 1710, H03K 17687

Patent

active

051534517

ABSTRACT:
A fail safe level shifter assures that, when an input signal voltage level falls below a given threshold voltage, the output is either a constant high or no signal at all. Additionally, a range of digital high signals having a voltage less than the given threshold voltage may be shifted by the fail safe level shifter. The fail safe level shifter expands the width of an N-MOS channel of conventional level shifters by placing two MOS switches in parallel. The resultant resistance allows the fail safe level shifter to register those high signals which are below the given threshold voltage. One-half of the level shifter has a N-MOS channel about one-half the width of a N-MOS channel in the other half of the level shifter. Therefore, the narrower half is unable to fully activate given the low input signals received. The fail safe level shifter thus assures that the output will be a constant high.

REFERENCES:
patent: 4695744 (1987-09-01), Giordano
patent: 4996443 (1991-02-01), Tateno

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