High voltage follower and sensing circuit

Details High voltage follower and sensing circuit High voltage follower and sensing circuit

1990-02-20

1992-01-21

Zazworsky, John

Electrical transmission or interconnection systems

Personnel safety or limit control features

Interlock

3072961, 307363, H03K 5153

Patent

active

050830457

ABSTRACT:
An on-chip circuit for producing signals to enable the operation of a circuit of special mode by sensing an externally applied signal to the chip or for supplying the externally applied voltage directly to the circuit in a special mode. The circuit includes an input terminal for inputting externally applied voltage, a controlling node, an output node, a voltage drop element connected between the input terminal and said controlling node to drop the input voltage, a first voltage supplying a terminal for supplying first bias voltage to the controlling node, a second voltage supplying terminal for receiving a second bias voltage, a switching element responsive to the voltage of the controlling node for providing a conducting path between said controlling node and said output node, a third voltage supplying terminal for receiving a third bias voltage, a constant current supply means connected between said third voltage supplying terminal and said output node for constantly supplying the same current to said output node, an output element connected with said output node for producing a signal of a specified logic level when the voltage of said output node exceeds a certain voltage level, a first output terminal connected with said output node and a second output terminal connected with said output element, whereby said first output terminal delivers a first output voltage following the externally applied voltage and said second output terminal delivers a second output voltage having a logic level according to said first output voltage.

REFERENCES:
patent: 4658156 (1987-04-01), Hashimoto
patent: 4706011 (1987-11-01), Vergara et al.
patent: 4709165 (1987-11-01), Higuchi et al.
patent: 4709172 (1987-11-01), Williams
patent: 4812680 (1989-03-01), Kawashima et al.

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