Semiconductor unit

Details Semiconductor unit Semiconductor unit

1996-08-27

1999-03-23

Wambach, Margaret Rose

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Amplitude control

327312, 327313, 327314, 327320, 327546, H03K 508

Patent

active

058865586

ABSTRACT:
A semiconductor unit is composed of an analog unit, a digital unit, a signal line through which a signal is transmitted from the analog unit to the digital unit, an electric source line Vdd1 through which a high voltage is applied to the analog unit, an electric source line Vdd2 through which the high voltage is applied to the digital unit, an electric source line Vss1 through which a low voltage is applied to the analog unit, an electric source line Vss2 through which the low voltage is applied to the digital unit, and a protective circuit arranged between the electric source lines Vss1 and Vss2. The protective circuit functions to electrically connect the electric source line Vss1 and the electric source line Vss2 in cases where an electric potential difference between the electric source lines Vss1 and Vss2 exceeds a prescribed value. Similar protection can be provided between the high voltage source lines Vdd1 and Vdd2 or between the signal line and the second source lines Vdd2 and Vss2.
In a semiconductor unit having a lengthy section of an electric source line connected between first and second circuits, a protective circuit short cuts the lengthy section of the electric source line.

REFERENCES:
patent: 4847518 (1989-07-01), Leidich
patent: 4958132 (1990-09-01), Plants
patent: 5272399 (1993-12-01), Tihanyi et al.
patent: 5280200 (1994-01-01), Tarng
patent: 5440163 (1995-08-01), Ohhashi
patent: 5486716 (1996-01-01), Saito et al.
patent: 5574395 (1996-11-01), Kusakabe
patent: 5610550 (1997-03-01), Furutani
IBM Tech Disc Bul., vol. 38, No. 12 327/314, Protect diode scheme for chips requiring isolated power/ground planes for internal/external noise isolation, Dec. 1995.

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