PREVENTIVE CIRCUIT FOR MALFUNCTION DUE TO LEAK CURRENT

摘要

PURPOSE:To prevent the malfunction of a circuit due to a leak current, by connecting a semiconductor element of the same side as transistor Tr generating a leak current, between the connectin point between the leak-current generating Tr and the next- stage Tr, and a power supply. CONSTITUTION:With switch 5 opened, no driving current flows from Tr3 to Tr8, but a leak current is generated at Tr3 and increases as the junction temperature rises. However, the same leak current as that at the base-open time of Tr3 flows to leak processing Tr11 and,in consequence, the leak current of Tr3 will not flow to the base of Tr8, so that the malfunction caused by the leak current can be prevented. Specially as for a semiconductor integrated circuit, Trs of the same size are formed on the same pellet and the leak currents of Tr3 and Tr11 therefore vary in the same direction, so that the malfunction due to the leak current can be prevented under no influence of element dispersion, temperature variation, etc.