Transmit modulation circuit and method of operating a transmitter

This invention relates to electronics, in general, and to transmitters having modulation circuitry and methods of operation, in particular. A transmitter () includes a fractional N synthesizer, a baseband digital modulation stage coupled to the fractional N synthesizer in a first modulation mode, and a baseband I/Q modulation stage also coupled to the fractional N synthesizer and reusing the fractional N synthesizer in a second modulation mode. A method () of operating a transmitter includes transmitting a first signal from a transmitter using the fractional N synthesizer and the baseband digital modulation stage to modulate the first signal according to a first wireless protocol. The method () also includes transmitting a second signal from the transmitter using the baseband I/Q modulation stage and the fractional N synthesizer to modulate the second signal according to a second wireless protocol.