A transmission signal generating circuit in a radio base station that employs spread processing circuits in order to output spread transmission signals. The signal generating circuit further contains power class selecting circuits, which categorize spread transmission signals into power classes, a first adding circuit, which combines these signals, multipliers, which adjust transmission power of these signals for respective power classes, and a second adding circuit, which combines these signals. The circuit measures and quantinizes the total transmission power to output a power level. A power limitation control memory outputs a multiplication coefficient representing the power class for which transmission power control. Selectors in the circuit select when this control is permitted for a given power class and output this information to the multiplier corresponding to the class. When this control is inhibited for the class, a multiplication coefficient is formed from a predetermined value, and output to the corresponding multiplier.