Patent ID: 7656234

Claim:
A circuit comprising: a logic circuit that includes therein a first transistor and a second transistor which are connected in series to each other between a high power supply and a low power supply in such a manner that an emitter of one of the first and second transistors is connected to a collector of the other of the first and second transistors, the first transistor being positioned closer to the high power supply and the second transistor being positioned closer to the low power supply, the logic circuit operating in accordance with voltages input into respective bases of the first and second transistors; and a current amplifying circuit that includes therein a third transistor whose collector is connected to one of the high and low power supplies, whose emitter is connected to the other of the high and low power supplies, and whose base is connected to an output from the logic circuit, the current amplifying circuit amplifying a current of a logic signal output from the logic circuit and feeding, from the emitter of the third transistor, the current-amplified logic signal back to the base of the second transistor, wherein the logic circuit includes: a first logic gate circuit that includes therein the first and second transistors, the first logic gate circuit outputting a result of a logic operation performed based on logic signals input into the respective bases of the first and second transistors; and a sequential circuit that is positioned so as to be adjacent to the first logic gate circuit, the sequential circuit operating in accordance with the result of the logic operation performed by the first logic gate circuit, and outputting a logic signal determined in accordance with a result of the operation to the current amplifying circuit, and wherein the current amplifying circuit is positioned so as to be adjacent to a side of the sequential circuit which is opposite to a side to which the first logic gate circuit is adjacent.