Schmitt trigger adapted to interface between different transisto

Details Schmitt trigger adapted to interface between different transisto Schmitt trigger adapted to interface between different transisto

1988-04-21

1990-02-27

Heyman, John S.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307279, 307354, 307359, 307451, H03K 329, H03K 5153, H03K 19094

Patent

active

049048848

ABSTRACT:
A Schmitt trigger having first and second complementary switches is biased to exhibit hysteresis, switching at a high threshold level when the input signal increases, and switching at a low threshold level when the input decreases. The source driver for the Schmitt trigger is coupled to the input of at least one of the complementary switches by transition circuitry, such that the signal level representing one binary value is shifted closer to the level of the power supply voltage corresponding to such binary value without changing the logical value of the signal from the source driver. In one embodiment, the first inverter is a MOS transistor, the threshold level of which is set by a bias voltage applied to the gate of another MOS transistor. The second inverter is a pair of complementary CMOS transistors. In another embodiment, the first inverter also comprises a pair of complementary CMOS transistors. The threshold level is set by selecting the W/L ratio of the CMOS transistors of the first inverter. In another embodiment the first inverter comprises a differential amplifier.

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patent: 4703201 (1987-10-01), McGrail
patent: 4719367 (1988-01-01), Denda
patent: 4733107 (1988-03-01), O'Shaughnessy

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