Voltage-current conversion circuit, amplifier, mixer circuit, and mobile appliance using the circuit

A cross-coupled low-distortion voltage-current conversion circuit has transistors T to T. At least one of the transistors has parallel connections of two or more transistors. By arbitrarily setting the number of parallel connections of the transistors T to T, the current distributions of the circuits are optimized while maintaining the conventional low-distortion operation. The invention finds applications in amplifiers and mixers that need to be operated with low distortion and low power consumption. The invention provides a cross-coupled low-distortion voltage-current conversion circuit that has freedom of design and improved performance without increasing power consumption over the entire circuit.