Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Particular stable state circuit
Patent
1994-04-19
1996-02-06
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Particular stable state circuit
327205, 327399, 327434, H03K 3037, H03K 312
Patent
active
054898668
ABSTRACT:
An improved Schmitt trigger, especially useful for large scale integrated circuit applications, includes a buffer (inverter) having a pull up device and two pull down devices all connected between a voltage supply and ground, and each receiving the input signal at its gate terminal. A node between the output terminals of the pull down devices is connected to the output terminal of the Schmitt trigger. A feedback line connects the output terminal of the Schmitt trigger to the gate of an N-channel depletion device connected between the pull-up and pull-down devices. Also provided are two devices to control the timing of the Schmitt trigger; these two control devices are connected between the output terminal of the Schmitt trigger and the output terminal of the inverter.
Also provided in one embodiment is electrostatic discharge protection connected to the Schmitt trigger input and output terminals, and in another embodiment a control device for turning on and off the supply voltage to the inverter.
REFERENCES:
patent: 4539489 (1985-09-01), Vaughn
patent: 4849653 (1989-07-01), Imai et al.
patent: 4875130 (1989-10-01), Huard
patent: 5177376 (1993-01-01), Wellnitz et al.
Callahan Timothy P.
Kim Jung Ho
Klivans Norman R.
Xilinx , Inc.
Young Edel M.
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