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This paper presents a SiGe BiCMOS transmitter for large bandwidth Polar Modulation and PWM signals. For flexibility, the transmitter presented in the paper has an externally controllable class of operation. Fabricated in a SiGe BiCMOS process (QUBIC4G), the measured saturated output power of the transmitter is 27 dBm and the measured PAE is 62%. It features an IMD3 of -30 dBc up to 25 dBm peak envelope power and fulfills the spectral mask for WLAN 802.11.a signals.