Logic level converter

Details Logic level converter Logic level converter

1976-05-10

1977-05-10

Heyman, John S.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307208, 307251, 307279, 307DIG1, 307DIG4, H03K 1760, H03K 1704, H03K 3286, H03K 3353

Patent

active

040230503

ABSTRACT:
A logic level converter converts an input signal having first and second voltage levels to an output signal having first and third voltage levels in which the voltage excursion of the output signal is greater than that of the input signal. The converter comprises first and second cross-coupled inverters in which the second inverter provides the output signal and is biased with respect to the first and third voltage levels and in which the first inverter is biased with respect to the third voltage level and the digital input signal. A voltage divider is associated with the first inverter to insure sufficient voltage swing for proper switching of the inverters. The inverters have dissimilar gains to insure that when the inverters are biased at equal voltages, the inverters always assume a predetermined state. The converter is implemented with PMOS field effect transistors and includes capacitors for increasing switching speed.

REFERENCES:
patent: 3612908 (1971-10-01), Heimbigner
patent: 3902082 (1975-08-01), Proebsting et al.
patent: 3916430 (1975-10-01), Heuner et al.
patent: 3942043 (1976-03-01), Sirocka et al.

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