Miscellaneous active electrical nonlinear devices – circuits – and – Specific signal discriminating without subsequent control – By amplitude
Patent
1995-06-26
1997-05-06
Tran, Toan
Miscellaneous active electrical nonlinear devices, circuits, and
Specific signal discriminating without subsequent control
By amplitude
327 78, 327 80, 327530, H03K 5153
Patent
active
056274858
ABSTRACT:
This invention is a super voltage detection circuit that functions independent of power supply voltage. The circuit employs a reference node that is coupled to V.sub.CC through a current-limiting device. The node is also coupled to ground via a plurality of series-coupled N-channel diodes. The current-sinking capability of the series-coupled diode path is greater than the current passing capability of the current-limiting device. Thus, a reference voltage is established at the node. The reference voltage is applied to the gate of a P-channel field-effect transistor which acts as a comparator device. The source region of the comparator device is coupled to an input terminal through a plurality of series coupled N-channel diodes. A super voltage may be selectively applied to the terminal. The source of the comparator device is also coupled to the reference node through an N-channel diode, which assures that the comparator transistor is always at a voltage lower than the gate when no super voltage is applied to the input terminal. The drain region of the comparator device is coupled to ground through a device which functions as a resistor. The voltage step-down between the input terminal and the source is set so that when a super voltage is applied to the terminal, the potential on the source rises above the gate voltage, thus initiating current flow through the comparator device. Therefore, the potential at the drain is indicative of the presence of a super voltage at the input terminal.
REFERENCES:
patent: 4658156 (1987-04-01), Hashimoto
patent: 5083045 (1992-01-01), Yim et al.
patent: 5118968 (1992-06-01), Douglas et al.
patent: 5170077 (1992-12-01), Schreck
patent: 5278458 (1994-01-01), Holland et al.
patent: 5278460 (1994-01-01), Casper
Prior Circuit used by Micron Technology, Inc. no date.
Casper Stephen L.
Miller James E.
Fox III Angus C.
Micro)n Technology, Inc.
Tran Toan
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