Integrated high voltage differential sensor using the inverse ga

Details Integrated high voltage differential sensor using the inverse ga Integrated high voltage differential sensor using the inverse ga

1993-04-22

1995-06-13

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Specific signal discriminating without subsequent control

By amplitude

327 69, 327561, H03K 524

Patent

active

054246636

ABSTRACT:
An integrated high voltage differential sensor which uses the inverse gain of a pair of parasitic JFETs to provide a low power circuit for translating a differential high voltage signal down to a lower voltage level that can be easily sensed by the low voltage control circuitry in a power IC and without the use of a resistive voltage divider. The IC includes, between a first high voltage input and ground, a first series circuit of a first JFET, a first voltage level shifting resistor and a bias current source (I.sub.B). A second series circuit of a reference resistor (R.sub.L), a second JFET, a second voltage level shifting resistor and a bias current source (I.sub.B) is coupled between a second high voltage input and ground. A feedback circuit including an operational amplifier is coupled between a low voltage point of the first series circuit and the gates of both JFETs so as to adjust the bias voltages of the JFETs. A comparator is coupled to a low voltage point of the second series circuit and switches about an input differential threshold value of I.sub.B R.sub.L.

REFERENCES:
patent: 4388540 (1983-06-01), Schreurs
patent: 4625131 (1986-11-01), Kasperkovitz et al.
patent: 5081708 (1992-01-01), Saochi et al.
patent: 5113092 (1992-05-01), Herold
patent: 5189317 (1993-02-01), Palara et al.
patent: 5220207 (1993-06-01), Kovalcik et al.

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