Patent ID: 7477090
Filing Date: 2009-01-13
Classification: H03K

Abstract:
1. A signal output circuit comprising: a signal generator that generates plural control signals having a prescribed phase difference; a voltage generator that comprises circuit elements with the same variations selected from the group consisting of characteristics with respect to the manufacturing process, temperature, as those of the circuit elements of said signal generator, and supplies the power source voltage to said signal generator; and an output circuit that is connected to a first and second signal output terminal and that comprises plural output transistors, to respective control terminals of which said control signals having a prescribed phase difference are applied, wherein said output circuit comprises a first transistor group connected to the first signal output terminal and a second transistor group connected to the second signal output terminal; a differential signal is output from said first and second signal output terminals, and wherein said first transistor group contains plural transistor pairs, each of which is composed of a transistor of the first conductivity type and a transistor of the second conductivity type, and said control signals having a prescribed phase difference are supplied to said plural transistor pairs, respectively; said second transistor group contains plural transistor pairs, each of which is composed of a transistor of the first conductivity type and a transistor of the second conductivity type, and said control signals having a prescribed phase difference are supplied to said plural transistor pairs, respectively; and the phases of said control signals supplied to the transistor pairs of said first transistor group are inverted with respect to the phases of said control signals supplied to the transistor pairs of said second transistor group.