modulators for amplitude - modulating signals defined by phase information and envelope codes are provided with first transistors for receiving the phase information and second transistors for receiving the envelope codes . the first main electrode of one transistor is coupled to the second main electrode of the other transistor and the other second main electrode constitutes an output of the modulator . this modulator can be used in any kind of transistor environment and is simple and low cost . the doped areas of the coupled first and second main electrodes comprise an overlap to reduce cross - talk and to reduce silicon area . polar transmitters are provided with this modulator and with a circuit for generating a phase / frequency code and the envelope code and with an oscillator for receiving the phase / frequency code and for generating the phase information . a phase shift between the phase information and the envelope code reduce aliases .