Circuit for the realization of the logical íàundíâ and íàoderíâ - functions

摘要

1,031,455. Semi-conductor switching circuits. JOSEPH LUCAS (INDUSTRIES( Ltd. Sept. 3, 1962 [Sept. 18, 1961], No. 33325/61. Heading H3T. In a logic circuit, e.g. an AND-gate or an OR- gate, comprising a semiconductor controlled rectifier 7 of the type described in Specification 1,031,451, which can be switched off by the application of a suitable reverse potential to the gate electrode, the application of a suitable combination of positive pulse signals at terminals 13 and 14 renders the rectifier 7 conducting and also charges the capacitor 9 so that when the pulse signals terminate a negative pulse is applied to the gate electrode to switch the rectifier off. Output pulses of regulated amplitude are taken from across Zener diode 16. By a suitable choice of component values the circuit may be made to function either as an OR-gate or as an AND-gate.