Bilateral switching integrated circuit

Details Bilateral switching integrated circuit Bilateral switching integrated circuit

H - Electricity

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H01L 29/747 (2006.01) H01L 27/08 (2006.01) H01L 27/082 (2006.01) H03K 17/13 (2006.01) H03K 17/78 (2006.01)

Patent

CA 1038083

BILATERAL SWITCHING INTEGRATED CIRCUIT Abstract of the Disclosure A planar integrated circuit comprising four NPN (or PNP) transistors sharing a common collector, with four emitter-base leads between adjacent pairs of tran- sistors. The effective circuit is a lateral triac comprising eight transistors in a novel transistor bridge construction and having all active junctions reaching a single surface. As a result of symmetrical construction a gate current applied across one of two gate terminals and an associated main terminal, or a light-generated photocurrent, triggers the device to control an ac circuit. A preferred embodiment includes a two-stage base diffusion at particular impurity levels, thereby producing devices capable of controlling ac line voltages, i.e. 120 volts.

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