PURPOSE: To provide the transmision circuit enabling low-output operations by means of an integrated circuit and to improve cross modulation distoration at the time of low-output operations.

CONSTITUTION: At the time of low-output operations, a poitive voltage is impressed to a power save switch terminal SW1, OV is impressed to a power-off switch terminal SW2, only an NPN transistor Q7 is turned in a conducted state, and the voltage of a junction A is lower than the voltage of a normal transmitting state. In such a state, a radio of the resistance values of resistors R1 to R2 and the resistance value of a resistor R1 are selected so that the current of the respective emitters of NPN transistors Q3 and Q4 can be almost 1mA. Thus, a high frequency signal is sequentially amplified by a front stage amplifier 1 and a rear stage amplifier 2 while an infinitesimal bias current flows through a final stage amplifier 2, and radiated from an antenna through a balanced tuning circuit 3.