Schmitt trigger circuit with an adjustable trigger voltage

Details Schmitt trigger circuit with an adjustable trigger voltage Schmitt trigger circuit with an adjustable trigger voltage

1997-08-04

1999-02-23

Wells, Kenneth B.

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Particular stable state circuit

327108, 327333, H03K 3037

Patent

active

058748440

ABSTRACT:
A Schmitt trigger circuit capable of adjusting a trigger voltage includes a trigger inversion output portion for outputting an input signal by trigger inversion with a predetermined margin, first and second A/D converters for converting a voltage applied from outside to a digital signal to adjust a trigger voltage, first and second trigger voltage adjusting signal output portions for outputting adjusting signals to adjust a negative trigger voltage or a positive trigger voltage by the digital signal of the first and second A/D converters, and first and second trigger voltage adjusting portions having transistors selectively turned on/off by the adjusting signals of the first and second trigger voltage adjusting signal output portions, for outputting the adjusted trigger voltage to the trigger inversion output portion.

REFERENCES:
patent: 4859873 (1989-08-01), O'Shaughnessy et al.
patent: 5489866 (1996-02-01), Diba

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